3. CIVIL ENGINEERING SCHEDULE
UNACADEMY FREE SPECIAL CLASS 2
9 PM MON-FRIDAY
UNACADEMY FREE SPECIAL CLASS 1
8 PM MON-FRIDAY
Strength of Materials
12 PM MON-FRIDAY
PLANET GATE
4 PM MON-FRIDAY
CIVIL 101
9 AM MON-FRIDAY
PLANET GATE
PLUS CLASS
SPECIAL CLASS
SPECIAL CLASS
*Special Classes shall also be conducted on weekends, timings of which shall be intimated during the week
*Special Classes shall also be conducted on weekends, timings of which shall be intimated during the week
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18. Strength of Concrete
1. Water/Cement Ratio
⢠Water Cement Ratio means the ratio between the
weight of water to the weight of cement used in
concrete mix.
⢠Normally water cement ratio falls under 0.4 to 0.6
as per IS Code 10262 (2009) for nominal mix (M10,
M15 âŠ. M25)
⢠In 1918 Abrams presented his classic law in the
form:
⢠ð =
ðŽ
ðµð¥
⢠where x =water/cement ratio by volume and for 28
days results the constants A and B are 14,000 lbs/sq.
in. and 7 respectively.
25. II. Strength Of Concrete
3. Split Tensile Strength of Concrete
⢠The length of cylinder varies from one to two
diameters. Normally the test cylinder is 150
mm diameter and 300 mm long
⢠The test consists of applying compressive line
loads along the diameter until it fails
⢠ðºðððð ð»ðððððð ðºððððððð =
ðð·
ð ð«ð³
ð· = ððððððð ðððð ððððððð
ð³ = ðððððð ðð ðððððððð
ð« = ð ðð ðð ðððððððð
28. Maturity Concept of Concrete
⢠The strength development of concrete depends on
both time and temperature it can be said that
strength is a function of summation of product of
time and temperature. This summation is called
maturity of concrete
Maturity = Σ (time à temperature)
⢠Hydration of concrete continues to take place upto
about â11 C. Therefore, â11 C is taken as a datum
line for computing maturity
29. Maturity Concept of Concrete
⢠Exp: A sample of concrete cured at 20 C
for 28 days is taken as fully matured
concrete. Its maturity would be equal to�
= (28 Ã 24) Ã [20 â (â 11)]
Maturity = Σ (time à temperature)
= 20832°ð¶ â
34. Tensile Strength of Concrete in Flexure
ððð = ð. ð ððð
where ððð is the characteristic compressive
strength of concrete in N/mm2
35. Effect of Creep on Youngâs Modulus of Elasticity
⢠Long term Youngâs Modulus of Elasticity of concrete
ð¬ðªð³ =
ðððð ððð
ð + ðœ
Where ðœ is the creep coefficient
Creep Strain is strain which occurs due to continuous loading and temperature
effect for longer duration which may cause permanent deformation
Age of Loading ð
7 days 2.2
28 days 1.6
1 year 1.1
36. Tensile Strength of Concrete in Flexure
ððð = ð. ð ððð
37. Probabilistic Curve
Frequency
distribution
Or
Probability
distribution
(No. of times test
results obtained)
Strength of Concrete
ððð ðð
ðð â ð. ððð
5%
ð = ððððð ððð ð ðððððððð
(ð ððððð ð ðð ðððð ð ðð ðððððððð)
ðð = ððð + ð. ððð
=> ðð = ððð + ð. ððð
ðð = ðððð ðððððððð
ððð = ðððððððððððððð ðððððððð
55. Partial safety factors
2. Design Strength
⢠Design strength of material is the ratio of characteristic strength of material to
partial factor of safety
ð«ððððð ðððððððð ðð =
ðððððððððððððð ðððððððð ðð ððð ðððððððð (ð)
ððððððð ðððððð ðð ðððððð (ðžð)
⢠Clause 36.4.2 of IS 456 states that ðŸð for concrete and steel should be taken as 1.5
and 1.15, respectively when assessing the strength of the structures or structural
members employing limit state of collapse.
⢠Partial safety factor for steel (1.15) is comparatively lower than that of concrete
(1.5) because the steel for reinforcement is produced in steel plants and
commercially available in specific diameters with expected better quality control
than that of concrete.
56. Partial safety factors
⢠ððð ðºðððð ðð =
ðð
ð.ðð
= ð. ðððð
⢠ððð ðªððððððð ðð =
ððð
ð.ð
= ð. ððððð
⢠In case of concrete the characteristic strength is calculated on the basis of test results on
150 mm standard cubes. But the concrete in the structure has different sizes. To take the
size effect into account, it is assumed that the concrete in the structure develops a strength
of 0.67 or (1/1.50) times the characteristic strength of cubes.
⢠Accordingly, in the calculation of strength employing the limit state of collapse, the
characteristic strength (fck) is first multiplied with 0.67 (size effect) and then divided by 1.5
(ðžð for concrete) to have 0.446 fck as the maximum strength of concrete in the stress block.
⢠ððð ðªððððððð ðð =
ððð
ð.ð
à ð. ðð = ð. ðððððð
57. Assumptions of Limit State Method
5. Tensile strength of concrete is neglected
6. Maximum strain in tension reinforcement in the section at failure
should not be less than
ðºð â¥
ð. ðððð
ð¬ð
+ ð. ððð ðð ðºð â¥
ðð
ð. ððð¬ð
+ ð. ððð
D
b
Neutral Axis
Ast d
ðºð â¥
ð. ðððð
ð¬ð
+ ð. ððð
0.0035 0.446 fck
C
0.002
ð. ðððð
71. Limiting values of Tension steel
⢠Minimum area of tension reinforcement
should not be less than
ðšð
ðð
=
ð. ðð
ðð
ðŽ0=minimum area of tension r/f
fy = characteristic strength of steel in N/mm2
⢠Maximum area of tension reinforcement
should not be greater than 4 % of the gross
cross sectional area to avoid difficulty in
placing and compacting concrete properly
in framework
72. Effective Span of Beam
1) Simply Supported beam or Slab: The effective span of a simply
supported member is taken lesser of the following:
I. ð = ð³ð + ð
II. ð (centre to centre distance between supports)
Where ð = centre to centre distance between supports
ð³ð = clear span
ð = ððððððððð ð ðððð ðð ðððð ðð ðððð
ð¿ð
ð
73. Effective Span of Beam
2) Continuous Beam or Slab: The effective span of a continuous member
is taken as:
i. If width of support ðð â€
ð³ð
ðð
, then effective span is taken as lesser of âŠ
a) ð = ð³ð + ð
b) ð (centre to centre distance between supports)
Where ð = centre to centre distance between supports
ð³ð = clear span
ð = ððððððððð ð ðððð ðð ðððð ðð ðððð
ii. If width of support ðð >
ð³ð
ðð
or 600 mm , then effective span is taken as lesser of
âŠ
a) ð = ð³ð + ð. ð ð
b) ð = ð³ð + ð. ð ðð
ð¿ð
ð ð
ð¿ð
ðð
82. Steps for Design
6. Minimum shear reinforcement
7. Maximum spacing in shear
reinforcement
1. Sv < 0.75 d Vertical shear
Reinforcement
2. Sv < d Inclined shear Reinforcement
3. However, the spacing shall not exceed
300 mm in any case.
(whichever is minimum out of these)
83. BEAMS:
1. Minimum tension reinforcement:
ðšð
ðð
=
ð.ðð
ðð
2. The maximum reinforcement in tension or compression: should not exceed 0.04bD,
Where, D = overall depth of section (4 % of the gross cross sectional area)
3. Side face reinforcement: If depth of the web in a beam exceeds 750 mm, side-face
reinforcement should be provided along the two faces. The total area of such
reinforcement should not be less than 0.1 % of the web -area. It should be equally
distributed on each of the two faces; The spacing of such reinforcement should not
exceed 300 mm or web thickness whichever is less.
4. Shear Reinforcement: Clause 26.5.1.5 of IS 456 stipulates that the maximum spacing
of shear reinforcement measured along the axis of the member shall not be more than
0.75 d for vertical stirrups and d for inclined stirrups at 45° , where d is the effective
depth of the section.
⢠Sv < 0.75 d Vertical shear Reinforcement
⢠Sv < d Inclined shear Reinforcement
⢠However, the spacing shall not exceed 300 mm in any case.
REINFORCEMENT REQUIREMENTS
86. Design Bond stress for concrete for PLAIN bars in TENSION
Grade of Concrete WSM LSM
M15 0.6
M20 0.8 1.2
M25 0.9 1.4
M30 1 1.5
M35 1.1 1.7
M40 and above 1.2 1.9
⢠For deformed bars conforming to IS 1786 these
values shall be increased by 60 percent
⢠For bars in compression, the values of bond stress
for bars in tension shall be increased by 25
percent.
⢠For fusion bonded epoxy coated deformed bars,
design bond stress values shall be taken as 80
percent of the values given in the above table
Fusion Bonded Epoxy is very fast curing, thermosetting Protective Powder Coating. It is based on specially selected Epoxy resins and hardeners. The epoxy
formulated in order to meet the specifications related to protection of steel bars as an anti-corrosion coating
113. Using LSM
⢠For short axially loaded column with ðððð †ð. ððð³ð³ð«,
column can be designed as
⢠ð·ð = ð. ðððððšð + ð. ðððððšðð
⢠For circular column,
⢠ð·ð = ð. ðð(ð. ðððððšð + ð. ðððððšðð)
114. Columns (LSM)
⢠Assumptions: Clause 39.1, Minimum Eccentricity 39.2,
Short Axially loaded Members in Compression 39.3
1. Minimum Eccentricity (whichever is maximum) (Cl 39.2)
ðððð â¥
ð
500
+
ð·
30
> 20ðð
2. If Minimum eccentricity value as per CL 39.2 is less than
or equal to 0.05 Ã Least Lateral Dimension, then the
column can be designed as per following equation of Short
Column
ðððð †ð. ðð ð³ð³ð« (ððððððð ðððð ðð ðºðððð ðªððððð)
122. CONTROL OF DEFLECTION
⢠The deflection of a structure or its part should
not adversely affect the appearance or
efficiency of the structure or finishes or
partitions
⢠The deflection including the effects of
temperature, shrinkage and creep occurring
after the construction of partitions, and finishes
should not exceed span/350 or 20 mm,
whichever is lesser
⢠The total deflection due to all loads including
the effects of temperature, shrinkage and creep
should not exceed span/250 when measured
from the as cast level of the supports of floors,
roofs and all other horizontal-members,
125. Depth of Slab
⢠The depth of slab depends on bending moment and deflection criterion. the trail
depth can be obtained using: ⢠The effective depth d of two way slabs can also be
assumed using cl. 24.1,IS 456 provided short span
is †3.5m and loading class is < 3.5KN/m2
127. CIVIL ENGINEERING
Civil Engineering by Sandeep Jyani
ALL FORMULAE OF CIVIL ENGINEERING
3ð à 3.5ð ð ðð§ð
For slabs spanning in two directions, the
shorter of the two spans should be taken
for calculating the span to effective depth
For 3ð à 3.5ð ðððð¡ðððð¢ð slab (using Fe
250),
ð ððð
ðð£ððððð ðððð¡â
= 40
â
3ð
ðð£ððððð ðððð¡â
= 40
â ðð£ððððð ðððð¡â =
3
40
â ðð£ððððð ðððð¡â = 0.075ð
131. Criteria for Design
1. Depth of footing:
All foundations should be located at a minimum
depth of 0.5m below the ground surface
The depth is primarily governed by availability
of bearing capacity, minimum seasonal variation
like swelling and shrinkage of soil
Using rankineâs formula, minimum depth of
foundation is given by
ð·ð =
ð
ðŸ
1 â ð ððâ
1 + ð ððâ
2
ð=gross safe bearing capacity
ðŸ=unit weight of soil
â =angle of friction
134. CIVIL ENGINEERING
Civil Engineering by Sandeep Jyani
ALL FORMULAE OF CIVIL ENGINEERING
Area of Foundation
ðšððð ðð ððððð ððððð =
ð·ð
ðð
While calculating the area of footing
required, self weight of footing is
considered
Net design soil pressure on foundation
ðŸ =
ð· (ðððððð)
ðš(ððððððð)
ðŸðºðŽ
ðŸð = ð. ððŸ (ð³ðºðŽ)
While calculating the upward soil pressure,
the self weight of the footing is not
considered
148. PERMISSIBLE STRESS IN STEEL STRUCTURES
1. As per WSM
i. Maximum permissible AXIAL stress in compression is given
by
ððð = ð. ðð ðð
⢠Used in the design of columns and struts.
⢠Column is a compression member where bending moment
exists while in case of struts, also being a compression
member, bending moment is zero. Because strut is a
component of roof trusses and roof trusses are pin jointed
connection having bending moment equal to zero.
ii. Maximum permissible AXIAL stress in tension is given by
ððð = ð. ðð ðð
It is used in design of tension members
149. PERMISSIBLE STRESS IN STEEL STRUCTURES
1. As per WSM
iii. Maximum permissible bending stress in compression is given
⢠Used in design of flexural (bending) member that is beam, built up beam,
plate girder etc.
ððð = ð. ðð ðð
iv. Maximum permissible bending stress in tension is given
⢠Used in the design of beams
ððð = ð. ðð ðð
v. Maximum permissible average shear stress is given by
ðð ððð = ð. ðððð
vi. Maximum permissible Maximum shear stress is given by
ðð ððð = ð. ðððð
FOS=2.5 for average shear stress
FOS=2.2 for maximum shear stress
150. PERMISSIBLE STRESS IN STEEL STRUCTURES
1. As per WSM
vi. Maximum permissible bending stress in column base
is given by
ð = ð. ðð ðð
Increase of permissible stress
⢠When wind and earthquake load are considered, the
permissible stresses in steel structure are increased by
33.33%.
⢠When wind and earthquake load are considered, the
permissible stresses in connections (rivet and weld) are
increased by 25%.
151. PERMISSIBLE DEFLECTION IN STEEL STRUCTURES
⢠As per WSM, Maximum permissible horizontal and vertical
deflection is given by
ð =
ðððð
ððð
⢠As per LSM, Maximum permissible horizontal and vertical
deflection is given by
a) If supported elements are not susceptible to cracking
ð =
ðððð
ððð
b) If supported elements are susceptible to cracking
ð =
ðððð
ððð
152. PERMISSIBLE DEFLECTION IN GANTRY GIRDER
1. For manually operator crane, the
maximum permissible deflection is
ð =
ðððð
ððð
2. For electrically operator crane, the
maximum permissible deflection for a
capacity upto 50T or 500kN
ð =
ðððð
ððð
3. For electrically operator crane, the
maximum permissible deflection for a
capacity more than 50T or 500kN
ð =
ðððð
ðððð
Gantry girders are laterally unsupported beams to carry. heavy loads from
place to place at the construction sites
153. FACTOR OF SAFETY FOR DIFFERENT STRESSES
Factor of Safety =
ðŠðððð ð ð¡ððð ð
ð€ðððððð ð ð¡ððð ð
=
ððŠ
ð
1. For axial stress, F.O.S. =
ððŠ
0.60ð
= 1.67
2. For bending stress, F.O.S. =
ððŠ
0.66ð
=
1.50
3. For shear stress, F.O.S. =
ððŠ
0.40ð
= 2.50
157. CONNECTIONS
1. RIVETED CONNECTIONS:
⢠Strength of riveted joint
⢠It is taken as minimum of shear strength, bearing strength and tearing
strength.
⢠FOR LAP JOINT:
1. FOR ENTIRE PLATE
a) SHEAR STRENGTH OF RIVETS
ð·ð = ð Ã
ð
ð
ïŽð ðïŽðð
Where n â total number of rivets at joint
Fs â permissible shear stress in rivets
Fs = 100MPa (WSM)
Fu = ultimate shear stress in rivet
so in LSM =
ðð
ð ïŽ 1.25
d â gross diameter of rivet (hole diameter)
Gross dia = nominal dia + 1.5 mm, for nominal dia †25 mm
Gross dia = nominal dia + 2 mm, for nominal dia > 25 mm
P B P
159. CONNECTIONS
1. RIVETED CONNECTIONS:
⢠LAP JOINT:
2. FOR GAUGE LENGTH/PITCH LENGTH
a) SHEAR STRENGTH OF RIVETS
ð·ðð = ð Ã
ð
ð
ïŽð ðïŽðð
Where n â total number of rivets at joint in crossed gauge
length
Fs â permissible shear stress in rivets
Fs = 100MPa (WSM)
Fu = ultimate shear stress in rivet so in
LSM =
ðð
ð ïŽ 1.25
d â gross diameter of rivet (hole diameter)
Gross dia = nominal dia + 1.5 mm, for nominal dia †25 mm
Gross dia = nominal dia + 2 mm, for nominal dia > 25 mm
1
1
P
P g
161. CONNECTIONS
1. RIVETED CONNECTIONS:
⢠DOUBLE COVER BUTT JOINT:
1. FOR ENTIRE WIDTH OF PLATE
⢠SHEAR STRENGTH OF RIVETS
ð·ðð = ðïŽðð Ã
ð
ð
ïŽð ðïŽðð
Where n â total number of rivets at joint
Fs â permissible shear stress in rivets
Fs = 100MPa (WSM)
d â gross diameter of rivet (hole diameter)
2 â Double shear
1
1
P
P B
MAIN PLATE
P
P
164. CONNECTIONS
1. RIVETED CONNECTIONS:
⢠DOUBLE COVER BUTT JOINT:
2. FOR GAUGE LENGTH
a) SHEAR STRENGTH OF RIVETS
ð·ðð = ð Ã ð Ã
ð
ð
ïŽð ðïŽðð
Where n â total number of rivets at joint in crossed gauge
length (here 2)
Fs â permissible shear stress in rivets
Fs = 100MPa (WSM)
Fu = ultimate shear stress in rivet so in
LSM =
ðð
ð ïŽ 1.25
d â gross diameter of rivet (hole diameter)
1
1
P
P g B
175. ASSUMPTIONS IN DESIGN OF RIVETED JOINT
ð â ð ððð ï£ nð¹ð (MOST IMPORTANT CONSIDERATION)
1
P
g
P
Where n is the number of rivets in shaded region
176. Analysis of Eccentric Connection
Step 1: Shear Force (ð¹1) in Rivet due to
Direct load P
ð¹ð =
ð
Ï ðŽð
à ðŽð
If dia of rivets are same, then the cross
section area would also be the same,
there fore direct shear load is
ð¹1 =
ð
ð à ðŽð
à ðŽð
â ð¹1=
ð
ð
ð ð·
ðððððð ðð ð° ððððððð
177. Analysis of Eccentric Connection
Step 2: Shear Force (ð¹2) in Rivet due to
Twisting Moment T
ð¹2 =
ð Ã ðð
à· ðð
2 ; ð = ðð
(ð£ðððð ð€âðð ððð ðð ððð£ðð¡ð ððð ð ððð)
Where ðð is the radial distance of each rivet
from centre of Rivet Group
ð ð·
ðððððð ðð ð° ððððððð
178. Analysis of Eccentric Connection
Step 3: Resultant Shear Force in the
Rivet (ð¹ð )
ð¹ = ð¹1
2
+ ð¹2
2
+ 2ð¹1ð¹2cosð
ð ð·
ðððððð ðð ð° ððððððð
180. IS RECOMMENDATIONS
5. EFFECTIVE CROSS SECTION AREA OF WELD (Throat area)
⢠Effective cross section area of weld = effective length of weld ïŽ
throat thickness
ðšðððððð = ð³ððð à ðð
6. LOAD CARRYING CAPACITY OF WELD/SHEAR STRENGTH OF
WELD
⢠P = Permissible shear stress ïŽ effective area of weld
⢠ð· = ððº à ð³ððð à ðð
⢠Fs â permissible shear stress
⢠Fs = 110MPa (WSM)
Fu = ultimate tensile stress in weld metal
so in LSM =
ðð
ð ïŽ 1.25
(1.25 for shop weld and 1.5 for field weld)
7. PITCH OF WELD
⢠For weld in compression zone, max pitch p = 12t or 200mm
⢠In tension zone, max pitch p = 16t or 200mm
181. Eccentric Welded Connection
1. IN PLANE ECCENTRIC CONNECTION
a) Direct Shear Stress due to P at 1
b) Torsional Shear Stress at Point 1
c) Calculate Resultant Force
ð ð·
ðððððð ðð ð° ððððððð
ð
ð
ð
ð
ð³ð
ð³ð
ð» = ð·ð
ð·
ðð
ðð
ðð¹
ð¹1 =
ð
(ð1 + ð2 + ð3)ð¡ð¡
ð
ðŒð
=
ð
ðððð¥
ð = ðð =
ð à ðððð¥
ðŒð
ð³ð
182. Eccentric Welded Connection
1. IN PLANE ECCENTRIC CONNECTION
⢠The effect of eccentric load at the CG of
weld group will be direct load P and
twisting moment T i.e. ð» = ð·ð where ð
is measured from CG of the weld group.
⢠Due to direct load the direct shear stress
ðð developed at point ð
⢠Due to twisting moment, the torsional
shear stress ðð is developed at ð
⢠Since these are two stresses are shear
stresses, we can find their resultant ðð¹
ðð¹ = ð¹1
2
+ ð¹2
2
+ 2ð¹1ð¹2cosð
ð ð·
ðððððð ðð ð° ððððððð
ð
ð
ð
ð
ð³ð
ð³ð
ð» = ð·ð
ð·
ðð
ðð
ðð¹
ðð¹ should not be greater than ðð (WSM, ðð = 110 ððð )
ðð¹ should not be greater than ðð (LSM ðð =
ðð¢
3Ã1.25
)
183. LACINGS
⢠Lacing member are idealised as truss
element, i.e., they re subjected either to
tension or compression.
⢠B.M. in lacing member is zero, to ensure
that bending moment is zero, provide only
one rivet at each end as far as possible.
⢠ðððð =
ð°ððð
ðš
=
ððð
ððÃðð
=
ð
ðð
⢠Maximum slenderness ratio ð for lacing
member is limited to 145.
⢠The angle of lacing w.r.t. vertical is 40° to
70° (welding 60° to 90°)
ð
ð
184. Arrangement in A is better than B, because if one rivet fails, spacing of lacing
member does not change in A while in B, spacing will be doubled. Hence there
will be possibility of buckling of connection in B.
c
ð =
ðœ
ð
ððððððœ
c
ð = ðœððððœ
A B
ð =
ððœ
ðµ
ððððœ
185. FORCES IN LACING MEMBER
⢠Lacing system is designed to resist a transverse shear force
of ðœ = ð. ð% ðð ðððððð ðððð .
⢠The transverse shear force ðœ is shared by lacing system
both side equally, so the transverse shear force on each
lacing bar is
ðœ
ð
⢠2 denotes number of parallel planes
⢠For single lacing system of two parallel force system, the force in
each lacing bar ð =
ðœ
ð sin ðœ
⢠For double lacing system ð =
ðœ
ð sin ðœ
186. Plate Girder
⢠Compression Flange:
⢠It consists of flange plate, flange
angle and web equivalent
⢠Web equivalent is the web area
embedded between two flange angle
⢠In compression zone flange, web
equivalent is taken as
ðððð ðð ð€ðð
6
or
ðð€
6
⢠Tension Flange:
⢠It consists of flange plate, angle and
web equivalent
⢠In tension zone, web equivalent is
taken as
ðð€
8
ðŸðð ð·ðððð
ðððððð ðšðððð
ðððððð ððððð ððððð
ðððððð ðšðððð
ððð
ðªðððð ð ðððð ð ð
189. Case1: LOAD CARRYING
CAPACITY FOR PLATE
⢠Load Carrying Capacity of
tension member:
⢠Safe load carrying capacity:
⢠Staggered riveting
⢠The critical section would be the
minimum area that would be 4-1-2-3-5
⢠Along the critical sections, for each
inclined leg, correspondingly
ðð
ð
ðð
term
is added to net area where ð is the
staggered horizontal distance of the
inclined leg along the critical path or
section and g is the gauge distance
corresponding to the inclined leg
ððððð
ððððð
4
2
3
7 6
5
1
4 â 1 â 3 â 5
4 â 1 â 7
4 â 1 â 2 â 3 â 5
4 â 1 â 2 â 6
190. Case1: LOAD CARRYING
CAPACITY FOR PLATE
⢠Load Carrying Capacity of tension member:
⢠Safe load carrying capacity:
⢠Staggered riveting
⢠ðšððð = ð â ð§ðð +
ðð
ð
ððð
+
ðð
ð
ððð
ð
⢠ðð is no. of rivets along critical section
⢠d is gross dia or hole dia
⢠ðð and ðð are staggered pitch
⢠ðð and ðð are staggered gauge
ðð
ððððð
4
2
3
7 6
5
1
ðð
191. Case 2: LOAD CARRYING CAPACITY FOR ANGLE
A. If single angle tension member is
connected to gusset plate, then âŠ
⢠Safe load carrying capacity:
⢠Calculation of ðšððð
⢠For angle
⢠ðšððð = ðšð + ððšð
⢠k =
ððšð
ððšð+ðšð
⢠K= shear lag effect
⢠Where ðšð is net area of connected leg
⢠ðšð = (gross area of connected leg - area of
rivet hole)
⢠ðšð is gross area of unconnected leg/outstand
leg
⢠ðšð = ð â ð â
ð
ð
ð
⢠ðšð = ð â
ð
ð
ð
gussete plate
angle
ð
ð
ðšð = (ð â ð â
ð
ð
)ð
ðšð = (ð â
ð
ð
)ð
192. Case 2: LOAD CARRYING CAPACITY FOR ANGLE
B. If two angles are placed back
to back and connected to ONE
side of gusset plate
⢠ðšððð = ðšð + ððšð where K= shear
lag effect
k =
ððšð
ððšð+ðšð
⢠If TACK rivets are not provided along
their flange then each angle behaves
independently hence factor k =
ððšð
ððšð+ðšð
ðð¡ðð¢ðð¡ð¢ððð ð ðð£ðð¡
ðððð ð ðð£ðð¡
193. Case 2: LOAD CARRYING CAPACITY FOR ANGLE
C. If two angles are placed back to
back and connected to both sides of
gusset plate
⢠ðšððð = ðšð + ððšð where K= 1
⢠ðšððð = ðšð + ðšð
⢠It is the most efficient way of
connecting, then load carrying
capacity is maximum.
⢠If the two angles do not have rivet,
then each angle behaves
independently hence factor k =
ððšð
ððšð+ðšð
203. 1. Arithmetic Progression Method
⢠Increase in population from
decade to decade is assumed to be
constant
Population Forecasting Methods
ð·ð = ð·ð + ðàŽ¥
ð
ð·ð =Projected population after n decades
ð·ð = initial population/ last census
ð = number of decades between now and future
àŽ¥
ð =average increase in population per decade
204. Que. 1 The population of 5 decades are
given. Find out the population after 1 and 6
decades beyond last census by arithmetic
progression method.
Population Forecasting Methods
Year Population
1930 25000
1940 28000
1950 34000
1960 42000
1970 47000
205. Que. 1 The population of 5 decades are
given. Find out the population after 1 and 6
decades beyond last census by arithmetic
progression method.
ðšðððððð ð°ððððððð =
ððððð
ð
Population Forecasting Methods
Year Population
1930 25000
1940 28000
1950 34000
1960 42000
1970 47000
ð·ð = ð·ð + ðàŽ¥
ð
àŽ¥
ð =average increase in population per decade
Increase
3000
6000
8000
5000
àŽ¥
ð = ðððð
1. ð·ððððððððð ððððð ð ð ðððð ð ð·ð = ?
ð·ð = ð·ð + ðàŽ¥
ð
â ð·ðððð = ððððð + (ð) Ã ðððð
â ð·ðððð = ððððð
206. Que. 1 The population of 5 decades are
given. Find out the population after 1 and 6
decades beyond last census by arithmetic
progression method.
ðšðððððð ð°ððððððð =
ðððð
ð
Population Forecasting Methods
Year Population
1930 25000
1940 28000
1950 34000
1960 42000
1970 47000
ð·ð = ð·ð + ðàŽ¥
ð
àŽ¥
ð =average increase in population per decade
Increase
3000
6000
8000
5000
àŽ¥
ð = ðððð
2. ð·ððððððððð ððððð ð ð ðððð ðð ð·ð = ?
ð·ð = ð·ð + ðàŽ¥
ð
â ð·ðððð = ððððð + (ð) Ã ðððð
â ð·ðððð = ððððð
207. 2. Geometric Progression Method or Geometric Increase Method
⢠In this method Percentage Increase in
population from decade to decade is
assumed to be constant
Population Forecasting Methods
ð·ð = ð·ð ð +
ð
ððð
ð
ð·ð =Projected population after n decades
ð·ð = population of last known decade
ð = number of decades between now and future
ð =geometric mean rate of increase in population per decade
ð = ð
ð1ð2ð3ð4 ⊠ðð
ðµððð: ð®ð¶ð° ðŽððððð ððððððððð ð ð®ðððððððð
ð·ðððððððððð ðŽððððð ððððððð ðð ððððð ððð
ððððððð ððððð ððð ðð ððððð ðððððð ð
208. Que. 2 Determine the future population of a
town by Geometric Increase method in the
year 2011.
Year Population (in 1000)
1951 93
1961 111
1971 132
1981 161
209. Que. 2 Determine the future population of a
town by Geometric Increase method in the
year 2011.
Year Population (in 1000)
1951 93
1961 111
1971 132
1981 161
Increase
18
21
29
Percentage Increase
19.35 %
18.91 %
21.96 %
ðð
ðð
à ððð =
ðð
ððð
à ððð =
ðð
ððð
à ððð =
ð·ð = ð·ð ð +
ð
ððð
ð
ð = ð
ðððððððð ⊠ðð
â ð =
ð
ðð. ðð Ã ðð. ðð Ã ðð. ðð
â ð = ðð. ð % ððð ð ðððð ð
ð·ðððð = ð·ðððð ð +
ðð. ð
ððð
ð
= ððð ð +
ðð.ð
ððð
ð
= ððð. ððð
210. c) Incremental Increase Method
⢠Combination of Arithmetic and Geometric Increase method
⢠Actual increase in each decade is found
⢠Average increment of increases is found
Population Forecasting Methods
ð·ð = ð·ð + ðàŽ¥
ð +
ð(ð + ð)
ð
àŽ¥
ð
ð·ð =Projected population after n decades
ð·ð = population of last known decade
ð = number of decades between now and future
àŽ¥
ð =average increase of population of known decades
Population after n decades from present is
given by
àŽ¥
ð =average of incremental increase of known decades
211. Que. 3 Determine the future population of a
town by Incremental Increase method in the
year 2000.
Year Population
1940 23798624
1950 46978325
1960 54786437
1970 63467823
1980 69077421
ð·ð = ð·ð + ðàŽ¥
ð +
ð(ð + ð)
ð
àŽ¥
ð
212. Que. 3 Determine the future population of a
town by Incremental Increase method in the
year 2000.
Year Population
1940 23798624
1950 46978325
1960 54786437
1970 63467823
1980 69077421
Increase
23179701
7808112
8681386
5609598
ð·ð = ð·ð + ðàŽ¥
ð +
ð(ð + ð)
ð
àŽ¥
ð
Incremental Increase
-15371589
873274
-3071788
àŽ¥
ð =
ðððððððð
ð
àŽ¥
ð =average increase of
population of known decades
àŽ¥
ð =average of incremental
increase of known decades
àŽ¥
ð =
âðððððððð
ð
àŽ¥
ð = ðððððððð. ð àŽ¥
ð = âððððððð
214. GOI Manual Recommends..
1. Arithmetic Increase Method is
used for old cities, where growth
rate is constant
2. For new and younger cities, we will
use geometric Progression method
3. Whenever there is negative rate of
increase, incremental increase
method is used
4. Incremental Increase Method
generally gives values in between
Arithmetic progression method
and Geometric Progression
Method
215. Water Demand
5. Fire Demand
⢠For a total amount of water consumption,
for a city of 50 Lacs population, it hardly
amounts to 1 LPCD, but this water should
be easily available and kept always stored
in service reservoirs
226. 2. Chemical Parameters
iii. Alkalinity
⢠For Alkalinity Measurement, 0.02N ð¯ððºð¶ð is used in titration. 1 ml of acid
i.e. 0.02N ð¯ððºð¶ð gives 1 mg/L value of Alkalinity expressed as ðªððªð¶ð
0.02
1000
Ã
100
2
à 1000 = 1
ðð
ðð
ðð ð€ð¡ ðð ð¶ðð¶ð3
ðððððððð¡ðŠ =
ðð¢ðððð ðð ðððð ðžðð¢ðð£ððððð¡ð
ð¿ðð¡ððð ðð ðððð¢ð¡ððð
227. Que . Water contains 210g of ð¶ð3
2â
, 122g ð»ð¶ð3â and 68g of ðð»â. What is the
total alkalinity of water expressed as ð¶ðð¶ð3?
PRACTICE QUESTIONS
PRACTICE QUESTIONS
228. Que . Water contains 210g of ð¶ð3
2â
, 122g ð»ð¶ð3
â
and 68g of ðð»â. What is the
total alkalinity of water expressed as ð¶ðð¶ð3?
PRACTICE QUESTIONS
PRACTICE QUESTIONS
229. Que . Water contains 210g of ð¶ð3
2â
, 122g ð»ð¶ð3â and 68g of ðð»â. What is the
total alkalinity of water expressed as ð¶ðð¶ð3?
PRACTICE QUESTIONS
PRACTICE QUESTIONS
230. 2. Chemical Parameters
iv. Hardness
⢠The Hardness is expressed as ðªððªð¶ð equivalent of Calcium and
Magnesium present in water
ð»ðððððð ð ðð ðªððªð¶ð ðð/ð =
[ðŸð ðð ðªðð+]
[ð¬ð ðŸð ðð ðªðð+]
à [ðð ðð ðð ðªððªð¶ð]
+
[ðŸð ðð ðŽðð+]
[ð¬ð ðŸð ðð ðŽðð+]
à [ðð ðð ðð ðªððªð¶ð]
â ðžðð¢ðð£ððððð¡ ððððâð¡ ðð ð¶ð2+ =
40
2
â ðžðð¢ðð£ððððð¡ ððððâð¡ ðð ð¶ðð¶ð3 =
100
2
â ðžðð¢ðð£ððððð¡ ððððâð¡ ðð ðð2+ =
24
2
Hardness as CaCO3 in mg/L Degree of Hardness
0-55 Soft Water
56-100 Slightly Hard
101-200 Moderately Hard
201-500 Very Hard
248. Que 1. If initial DO = 5 mg/L, final DO = 2 mg/L.
5ml of sample is mixed to form 100 ml of diluted sample.
Find BOD.
249. Que If initial DO = 5 mg/L, final DO = 2 mg/L.
5ml of sample is mixed to form 100 ml of diluted sample.
Find BOD.
5ml of sample is mixed with 95ml of aerated water
ðµðð· = (5 â 2) Ã
100
5
âðµðð· = 60ðð/ð¿
250. Que 2. If initial DO = 5 mg/L, final DO =0 mg/L at the end of 5
days.
5ml of sample is mixed with 95 ml of aerated water. Find
BOD after 5 days.
251. Que 2. If initial DO = 5 mg/L, final DO =0 mg/L at the end of 5
days.
5ml of sample is mixed with 95 ml of aerated water. Find
BOD after 5 days.
ð¶ðð ððð¡ ðð ððð¡ððððððð ðð ð€ð ðð ððð¡ ðððð€ð ð€âðð ðð¡ ðððððð 0
254. Population Equivalent
⢠It indicates strength of industrial waste water for estimating
the treatment required at the municipal treatment plant
⢠Average BOD of domestic sewage is 80g/capita/day
⢠ðððð¢ððð¡ððð ððð¢ðð£ððððð¡ =
ð¡ðð¡ðð ðµðð·5
ðð ð¡âð ðððð¢ð ð¡ððŠ ðð ðð/ðððŠ
0.08 ðð/ðððŠ
255. ENVIRONMENTAL ENGG-2 CIVIL ENGINEERING
Civil Engineering by Sandeep Jyani
ALL FORMULAE OF CIVIL ENGINEERING
ðð Ã
ððð
ð/ð ðð
ððððð/ð ðððð/ð ðð
ï°
à ððð
à ððð