Basic points on earthquake resistant building
- Design considerations and different techniques employed to resist building from collapse during earthquake
information on types of beams, different methods to calculate beam stress, design for shear, analysis for SRB flexure, design for flexure, Design procedure for doubly reinforced beam,
Performance of High-Rise Steel Building With and Without BracingsIJERA Editor
A comparative study on performance of high-rise steel building with and without bracings, carried
out on a residential building by considering the gravity loads and lateral loads in the form of Earth quake loads
and Wind loads incorporating the Bracings to reduce lateral loads on structural elements. In this study, a 20
storey steel frame structure has been selected to be idealized as multi storey steel building model. The model is
analyzed by using STAAD.Pro 2008 structural analysis software with the consideration of wind and earthquake
loads. At the same time the influence of X-bracing pattern has been investigated.The building proposed in
designed by Limit State Method according to steel code IS: 800-2007, the Wind load analysis according to IS:
875-(part-3)1987 and seismic/Earth quake loads according to IS: 1893 (Part-1)-2002. In this study the node
displacements of buildings having with and without bracings of wind and earthquake effect of Zone II and
Zone V, and the axial force of the members of the buildings having with and without bracings of wind and
earthquake effect of Zone II and Zone V.
Basic points on earthquake resistant building
- Design considerations and different techniques employed to resist building from collapse during earthquake
information on types of beams, different methods to calculate beam stress, design for shear, analysis for SRB flexure, design for flexure, Design procedure for doubly reinforced beam,
Performance of High-Rise Steel Building With and Without BracingsIJERA Editor
A comparative study on performance of high-rise steel building with and without bracings, carried
out on a residential building by considering the gravity loads and lateral loads in the form of Earth quake loads
and Wind loads incorporating the Bracings to reduce lateral loads on structural elements. In this study, a 20
storey steel frame structure has been selected to be idealized as multi storey steel building model. The model is
analyzed by using STAAD.Pro 2008 structural analysis software with the consideration of wind and earthquake
loads. At the same time the influence of X-bracing pattern has been investigated.The building proposed in
designed by Limit State Method according to steel code IS: 800-2007, the Wind load analysis according to IS:
875-(part-3)1987 and seismic/Earth quake loads according to IS: 1893 (Part-1)-2002. In this study the node
displacements of buildings having with and without bracings of wind and earthquake effect of Zone II and
Zone V, and the axial force of the members of the buildings having with and without bracings of wind and
earthquake effect of Zone II and Zone V.
“Analysis and design of multi storeyed load bearing reinforced masonry struct...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Comparative Study on Construction Sequence Analysis on Steel Structure withou...ijtsrd
This paper presents the construction sequence analysis on the setback steel structure. In this study, the proposed building is eleven storey setback steel structure. The length of the proposed building is 78ft and width is 66ft. The effective height of proposed building is 142ft. This building is located in seismic destructive zone V, Mandalay. The basic wind speed is 80mph. The structure is composed of special moment resisting frame SMRF . Structural elements are designed according to AISC 360 10. Load consideration and stability checking for proposed building are based on ASCE 7 10. The proposed building is analysed and designed with the help of ETABS 2016 version 16.2.1 software. After response spectrum analysis RSA has done for the checking of the stability, then construction sequence analysis CSA is considered. And then the structural analysis results of the proposed building are studied such as axial force, shear force and bending moment of the structural frame elements. The effect of floating columns with CSA on axial force for the selected columns of proposed building is more influence from first to sixth floor level.The value of shear force with CSA is abruptly increased at the floated columns level and the other level are gradually decreased. The value of bending moment at the floated columns level is abruptly increased due to the effect of floating columns with CSA and the other level are gradually decreased. Tin Yadanar Kyaw | Nyein Nyein Thant "Comparative Study on Construction Sequence Analysis on Steel Structure without and with Floating Columns" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd27996.pdfPaper URL: https://www.ijtsrd.com/engineering/civil-engineering/27996/comparative-study-on-construction-sequence-analysis-on-steel-structure-without-and-with-floating-columns/tin-yadanar-kyaw
Study on the Effect of Response Spectrum Analysis and Construction Sequence A...ijtsrd
This paper presents the effect of response spectrum analysis and construction sequence analysis on the setback steel structure. In this study, the proposed building is eleven storey setback steel structure. The length of the proposed building is 78ft and width is 66ft. The effective height of proposed building is 142ft. This building is located in Mandalay. So it is situated not only destructive zone but also basic wind speed, 80mph. The structure is composed of special moment resisting frame SMRF . Structural elements are designed according to AISC 360 10 2 . Load consideration and stability checking for proposed building are based on ASCE 7 10 3 . The analysis and design of the proposed structure model is done with the help of ETABS 2016 version 16.2.1 software 6 . The present study involves response spectrum analysis RSA and construction sequence analysis CSA , which are done on a setback steel structure and the structural analysis results such as storey displacement, maximum axial force, maximum shear force and maximum bending moment of the structural frame elements are compared. The maximum storey displacement with CSA is increased by 56 than the displacement with RSA. The maximum axial force on columns with CSA is increased by 48 than axial force with RSA. The maximum shear forces and bending moments with CSA are more than shear forces and bending moments with RSA. Nyein Nyein Thant | Tin Yadanar Kyaw ""Study on the Effect of Response Spectrum Analysis and Construction Sequence Analysis on Setback Steel Structure"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-4 , June 2019, URL: https://www.ijtsrd.com/papers/ijtsrd25142.pdf
Paper URL: https://www.ijtsrd.com/engineering/civil-engineering/25142/study-on-the-effect-of-response-spectrum-analysis-and-construction-sequence-analysis-on-setback-steel-structure/nyein-nyein-thant
Effect of Impulsive Loads on G+3 RCC BuildingIJMERJOURNAL
ABSTRACT: The study of response of structures subjected to impulse loads is of utmost importance in civil engineering. These are the forces with large magnitude that act for relatively very short interval of time. These forces are dynamic in nature that may impart out of plane deformations to the building and hence the stability of the building may be under scrutiny. Bomb blast is the best example for impulsive load. In this paper an attempt has been made to determine the response of a G+3 RCC building modeled in STAAD Pro subjected to triangular, rectangular and sinusoidal impulsive force for 0.5 seconds with maximum magnitude of 100kN. The effect of such loads on front, roof and side surface of the building was studied. It was observed that the critical deformations were obtained on the front and roof surface of the building. The variation of deformation along the height of the building were parabolic in nature with maximum deformations at the top surface of the building. It was also concluded that sufficient reinforcement should be provided in beam, columns and slabs to impart ductility to the building against impulse loads..
Book Formatting: Quality Control Checks for DesignersConfidence Ago
This presentation was made to help designers who work in publishing houses or format books for printing ensure quality.
Quality control is vital to every industry. This is why every department in a company need create a method they use in ensuring quality. This, perhaps, will not only improve the quality of products and bring errors to the barest minimum, but take it to a near perfect finish.
It is beyond a moot point that a good book will somewhat be judged by its cover, but the content of the book remains king. No matter how beautiful the cover, if the quality of writing or presentation is off, that will be a reason for readers not to come back to the book or recommend it.
So, this presentation points designers to some important things that may be missed by an editor that they could eventually discover and call the attention of the editor.
Hello everyone! I am thrilled to present my latest portfolio on LinkedIn, marking the culmination of my architectural journey thus far. Over the span of five years, I've been fortunate to acquire a wealth of knowledge under the guidance of esteemed professors and industry mentors. From rigorous academic pursuits to practical engagements, each experience has contributed to my growth and refinement as an architecture student. This portfolio not only showcases my projects but also underscores my attention to detail and to innovative architecture as a profession.
1. SRES’ Sanjivani College of Engineering, Kopargaon.
Structural Design I (Steel Structures) Prof. Gayake Sudhir B. (SPPU, Pune) Page 1
Unit No. 6
6a) Design of Gantry Girder: Selection of gantry girder, design of cross section,
Check for moment capacity, buckling resistance, bi-axial bending,
Deflection at working load and fatigue strength.
6b) Roof Truss: assessment of dead load, live load and wind load,
Design of purlin, design of members of a truss,
Detailing of typical joints and supports.
2. SRES’ Sanjivani College of Engineering, Kopargaon.
Structural Design I (Steel Structures) Prof. Gayake Sudhir B. (SPPU, Pune) Page 2
6b) Roof Truss: Assessment of dead load, live load and wind load, Design of purlin, Design
of members of a truss, Detailing of typical joints and supports.
6.1 Introduction:
Industrial buildings are low rise structures characterized by their low height, lack of
interior floors, walls or partitions. The roofing system for such buildings is truss with roof
covering material. Trusses are triangular formations of steel sections in which the
members are subjected to essentially axial forces due to externally applied load.
Figure 6.1Plane Truss
Trusses are frequently used to span long lengths in the place of solid web girders.
When the external load lie in the plane of truss it is termed as plane trusses (figure 6.1)
whereas when the loads may lie in any three dimensional plane then such trusses are
termed as space trusses (figure 6.2).
Figure 6.2 Space Truss
Steel members subjected to axial forces are generally more efficient than members
in flexure since the cross section is uniformly stressed. Trusses frequently consist of axially
loaded members, thus are very efficient in resisting these loads. They are extensively used,
especially to span large gaps. Usually trusses are adopted in roofs of single storey industrial
buildings, long span floors, to resist gravity loads. Trusses are also used in long span
bridges to carry gravity loads and lateral loads.
6.2 Components parts of roof truss:
Below given are the important component parts of industrial roof truss. (figure 6.3)
3. SRES’ Sanjivani College of Engineering, Kopargaon.
Structural Design I (Steel Structures) Prof. Gayake Sudhir B. (SPPU, Pune) Page 3
a) Principal Rafter (PR) - It is the top chord member of truss subjected to only
compressive force due to gravity load if the purlins are supported at nodes. If the
purlins are intermediate of nodes then the PR will be subjected to bending moment.
b) Principal Tie (PT) – The lower chord of truss is known as principal tie and carries
only tension due to gravity loads.
c) Strut – The members of roof truss other than PR and PT subjected to compressive
force are termed as strut.
d) Sling - The members of roof truss other than PR and PT subjected to tensile force
are termed as sling.
e) Purlin- These are the flexural members carrying the roof and roof covering loads
and distributing it over truss members.
f) Bracings- The member of truss which makes it stable for accidental loads, out of
plane loads or lateral loads is termed as bracing system.
Figure 6.3 Components of truss
6.3 Types of roof trusses:
Depending upon the span of truss, requirements of elegance, depending upon
demands of particular building and the ventilation requirements the types of roof trusses
are classified as below(figure 6.3)-
a) Pratt truss-
b) Howe truss-
c) Fink truss-
d) Fan truss-
e) Fink fan truss-
f) Mansard truss-
Strut
P. Tie
4. SRES’ Sanjivani College of Engineering, Kopargaon.
Structural Design I (Steel Structures) Prof. Gayake Sudhir B. (SPPU, Pune) Page 4
(Figure 6.3)- Types of trusses.
6.4 Loads on roof trusses:
Roof trusses are mainly subjected to Dead load, Live load and wind load.
1. Dead Load (DL) - The DL of the truss includes the weight of roofing material,
purlins, bracings, and truss load. The unit weight of different material are given in
IS875 part I. An empirical formula to calculate the approximate dead weight of truss
in N/m2 is ( The weight of bracing may be assumed between 12 to 15
N/m2 of the plan area. The design of purlin based on the roofing material load is
already done therefore the weight of purlin can be considered for the design
directly.
2. Live Load (LL) - IS 875 gives the live loads acting on inclined roof truss depending
upon the inclination of PR and access provided or not above the roof.
Table 6.1 Live load values
Roof Slope Access Live Load
≤ 10 ° Provided 1.5kN/m2 of plan area
> 10 ° Not Provided 0.75 kN/m2 of plan area
For roof membrane sheets or purlins the live load is to be
calculated by 750-20(θ-10°) in N/m2
3. Wind Load (WL) – Wind load are most critical loads in design and analysis of
industrial roof truss. The design wind pressure for roofs or wall cladding must be
5. SRES’ Sanjivani College of Engineering, Kopargaon.
Structural Design I (Steel Structures) Prof. Gayake Sudhir B. (SPPU, Pune) Page 5
designed using the pressure difference between the opposite faces of such elements
to account for internal and external pressure exerted on the surface.
The wind force F on element is obtained by-
F= (cpe-cpi) APd
Where;
cpe= External pressure coefficient
cpi= Internal pressure coefficient
A= Inclined area of roof member (m2)
Pd= Design wind pressure (kN/m2)
a) External pressure coefficient (cpe) - The average external pressure coefficients and
pressure concentration coefficients for pitched roofs of rectangular clad building shall be as
given in Table 5of IS 875 Part 3. Where no pressure concentration coefficients are given,
the average coefficients shall apply.
Table 6.2a External pressure coefficients
6. SRES’ Sanjivani College of Engineering, Kopargaon.
Structural Design I (Steel Structures) Prof. Gayake Sudhir B. (SPPU, Pune) Page 6
Table 6.2b External pressure coefficients
b) Internal pressure coefficients (cpi) - Internal air pressure in a building depends upon
the degree of permeability of cladding to the flow of air. The internal air pressure may be
positive or negative depending on the direction of flow of air in relation to openings in the
buildings. In the case of buildings where the claddings permit the flow of air with openings
not more than about 5 percent of the wall area but where there are no large openings, it is
necessary to consider the possibility of the internal pressure being positive or negative.
Two design conditions shall be examined, one with an internal pressure coefficient of +0.2
and another with an internal pressure coefficient of -0.2.
c) Inclined Area (A) – Inclined area is calculated using spacing of truss multiplied by the
panel length of principal rafter.
d) Design wind pressure (Pd) - The design wind pressure at any height above mean
ground level shall be obtained by the following relationship between wind pressure and
wind velocity:
pz = 0.6 v z 2
where ;
pz = design wind pressure in N/m2 at height z, and
v= design wind velocity in m/s at height z.
e) Design wind speed (Vz)- The basic wind speed ( V) for any site shall be obtained from
Fig. 1 (IS 875 Part 3) and shall be modified to include the following effects to get design
wind velocity at any height ( Vz) for the chosen structure:
a) Risk level;
b) Terrain roughness, height and size of structure; and
c) Local topography.
It can be mathematically expressed as follows:
Vz= Vb k1 k2 k3
Where;
Vz = design wind speed at any height z in m/s; and for Vb refer below table;
7. SRES’ Sanjivani College of Engineering, Kopargaon.
Structural Design I (Steel Structures) Prof. Gayake Sudhir B. (SPPU, Pune) Page 7
Table 6.3 Basic wind speed
8. SRES’ Sanjivani College of Engineering, Kopargaon.
Structural Design I (Steel Structures) Prof. Gayake Sudhir B. (SPPU, Pune) Page 8
K1 = probability factor (risk coefficient) (see 5.3.1) (IS 875 Part 3) refer below table;
Table 6.4 Risk coefficients
9. SRES’ Sanjivani College of Engineering, Kopargaon.
Structural Design I (Steel Structures) Prof. Gayake Sudhir B. (SPPU, Pune) Page 9
K2 = terrain, height and structure size factor (see 5.3.2) (IS 875 Part 3)-
Terrain – Selection of terrain categories shall be made with due regard to the effect
of obstructions which constitute the ground surface roughness. The terrain category used
in the design of a structure may vary depending on the direction of wind under
consideration. Wherever sufficient meteorological information is available about the
nature of wind direction, the orientation of any building or structure may be suitably
planned. Terrain in which a specific structure stands shall be assessed as being one of the
following terrain categories:
Category 1 – Exposed open terrain with few or no obstructions and in which the
average height of any object surrounding the structure is less than 1.5 m.
Category 2 – Open terrain with well scattered obstructions having heights generally
between I.5 to 10 m.
Category 3 – Terrain with numerous closely spaced obstructions having the size of
building-structures up to 10 m in height with or without a few isolated tall structures.
Category 4 – Terrain with numerous large high closely spaced obstructions.
Table 6.5 k2 factor
The buildings/structures are classified into the following three different classes
depending upon their size:
Class A - Structures and/or their components such as cladding, glazing, roofing, etc.,
having maximum dimension (greatest horizontal or vertical dimension) less than 20 m.
Class B - Structures and/or their components such as cladding, glazing, roofing, etc.,
having maximum dimension(greatest horizontal or vertical dimension) between 20 to50m.
Class C - Structures and/or their components such as cladding, glazing, roofing, etc.,
having maximum dimension (greatest horizontal or vertical dimension) greater than 50 m.
10. SRES’ Sanjivani College of Engineering, Kopargaon.
Structural Design I (Steel Structures) Prof. Gayake Sudhir B. (SPPU, Pune) Page 10
K3 = topography factor (see 5.3.3) (IS 875 Part 3).
The basic wind speed Vb given in Fig. 1(IS 875 Part 3) takes account of the general
level of site above sea level. This does not allow for local topographic features such as hills,
valleys, cliffs, escarpments, or ridges which can significantly affect wind speed in their
vicinity. The effect of topography is to accelerate wind near the summits of hills or crest of
cliffs, escarpments or ridges and decelerate the wind in valleys or near the foot of cliff,
steep escarpments, or ridges.
The effect of topography will be significant at a site when the upwind slope (θ)
(figure 6.4) is greater than about 3°, and below that, the value of k3 may be taken to be
equal to 1. The value of k3 is confined in the range of 1 to 1.36 for slopes greater than 3°. A
method of evaluating the value of k3 for values greater than 1.0 is given in Appendix C (IS
875 Part 3). It may be noted that the value of k3 varies with height above ground level, at a
maximum near the ground, and reducing to 1.0 at higher levels. The topography factor k3 is
given by the following:
k3= 1+Cs
Where; Cs has the following values:
Table 6.6 K3 factor
Slope Cs
3°<θ<17° 1.2(z/L)
θ > 17° 0.36
Figure 6.4 Topographical Dimensions
11. SRES’ Sanjivani College of Engineering, Kopargaon.
Structural Design I (Steel Structures) Prof. Gayake Sudhir B. (SPPU, Pune) Page 11
Numerical 6.1) Determine the design forces and design the members L0U1 U1L1 L0L1 of an
truss where access is not provided and it is located in city area of Nashik. Assume c/c
spacing of truss 4m. Assume self-weight of purlin 100N/m, weight of bracing 80N/m2 and
weight of AC sheets 130N/m2. Take Rise of truss 3m. The Length of shed is 38m and width
is 18m and consider design life of 50 years. Height of building up to eves is 10m.
L0 L1 L2 L3 L4 L5 L6
Solution:
1) Truss Geometry-
a) Length of principal rafter (L0U3) = √ [(L0L3)2 + (U3L3)2] = √ [92 + 32] = 9.4868m.
b) Length of each panel in sloping (L0U1, U1U2, U2U3)
= (L0U3/No. of panels) = (9.4868/3)
= 3.1622m
c) Inclination of principal rafter (θ) = tan -1 (3/9) = 18.45°
d) Length of each panel in plan = 3.1622 cos 18.45° = 2.999 = 3m
e) Plan area = (plan length x spacing of truss) = 3 x 4 = 12 m2
2) Panel point loads due to dead load-
Weight of AC sheets = 130N/m2
Weight of bracing = 80N/m2
Self-weight of truss = ( = ( …………………………………….………..(6.4 a)
= 110 N/m2
Total area load = (130+80+110) = 320 N/m2
Plan load = Total area load x Plan area = 320 x 4 x 3 = 3840 N
Weight of purlin = Self weight of purlin x Spacing of truss
= 100 x 4 = 400 N
Final load on all intermediate panels due to DL = 400+3840 = 4240 N = 4.3 kN.
Final load on end panels due to DL = (4.3/2) = 2.15 kN.
θ
U1
U2
U3
U4
U5
3m
12. SRES’ Sanjivani College of Engineering, Kopargaon.
Structural Design I (Steel Structures) Prof. Gayake Sudhir B. (SPPU, Pune) Page 12
3) Panel point loads due to live load-
As Inclination of principal rafter (θ) = tan -1 (3/9) = 18.45° and the access is not provided to
roof then live load is calculated as;
Live load = 750-20(θ-10°) in N/m2 ……………………………………………………………..…………..(6.4 b)
= 750-20(18.45°-10°) in N/m2
= 581 N/m2
Final live load on each intermediate panel = Live load x Plan area
= 581x 4 x 3 = 6972 N = 7kN.
Final live load on end panel = (7/2) = 3.5 kN.
4) Panel point loads due to wind load-
As the industrial shed is having design life of 50 years and it is located in city area of nashik
region, given data suggest the following conclusions,
Vb = 39 m/s ……………………………………………………………………………………………………..(Table 6.3)
K1 = 1.0 …………………………………………………………………………………………………….……..(Table 6.4)
K2 = 0.88 ………………………………………………………………………………………………..………..(Table 6.5)
K3 = 1.0 ……………………………………………………………………………………………………….…..(Table 6.6)
Vz= Vb k1 k2 k3 ……………………………………………………………………………………………………………………………………………………….….(6.4.3 e)
= 39x1.0x0.88x1.0 = 34.32 m/s
Design wind pressure = pz = 0.6 v z 2 ……………………………………………………………………(6.4.3 d)
= 0.6x34.322 = 706.71 N/m2
Pd = 0.706 kN/m2
Height of the building is = 10m above the ground level and width of building is 18m.
(h/w) = (10/ 18) = 0.55
The external pressure coefficients (Cpe) for the condition and θ=18.45° from Table
6.2a the coefficients can be estimated as;
Inclination of
principal
rafter(18.45°)
Wind angle θ= 0° Wind angle θ= 90°
EF
(windward)
GH
(lee ward)
EG
(windward)
FH
(lee ward)
10 -1.1 -0.6 -0.8 -0.6
20 -0.7 -0.5 -0.8 -0.6
18.45° -0.762 -0.515 -0.8 -0.6
Among the above calculated coefficients the wind load on panel point can be calculated
separately considering the wind ward and lee ward effect or else the maximum worse
effect(maximum coefficient) among all can be approximately used to calculate the
maximum force as given;
F= (cpe-cpi) APd ………………………………………………………………………………………………………(6.4.3)
Assuming normal permeability for the industrial building; cpi= ±0.2
A = 3.1622 x 4 = 12.65 m2
cpe = -0.8
13. SRES’ Sanjivani College of Engineering, Kopargaon.
Structural Design I (Steel Structures) Prof. Gayake Sudhir B. (SPPU, Pune) Page 13
Pd = 0.706 kN/m2
Total wind load on panel = (-0.8 - -0.2) 12.56 x 0.706 = -5.32 kN (Suction)
Total wind load on panel = (-0.8 - +0.2) 12.56 x 0.706 = -8.86 kN (Suction)
Final wind load on intermediate panel = -8.86 kN
Final wind load on end panel = - (8.86/2) = -4.43 kN
Figure 6.5 Final dead loads at panel points
Figure 6.7 Final live loads at panel points
7 kN
2.15 kN2.15 kN
4.3kN
4.3kN
4.3kN
4.3kN
4.3kN
3.5 kN 3.5 kN
7 kN
7 kN 7 kN
7 kN
14. SRES’ Sanjivani College of Engineering, Kopargaon.
Structural Design I (Steel Structures) Prof. Gayake Sudhir B. (SPPU, Pune) Page 14
Figure 6.8 Final wind loads at panel points
5) Determining the member forces in L0U1 U1L1 L0L1 by method of joints for all types of
loadings.
a) Member forces due to dead load-
∑Fy=0
RL0 + RL6 = (2.15X2 + 4.3X5) = 25.8 kN
RL0 = RL6 = (25.8/2) = 12.9kN
Joint L0:
∑Fy=0
12.9-2.15+ FL0U1 sin 18.45°=0
FL0U1= -34kN (Compressive)
∑Fx=0
F L0L1 + FL0U1 cos18.45°=0
FL0L1 = (34 cos18.45°) = 32.25 kN (Tensile)
Joint L1:
∑Fy=0
FL1U1=0 …Zero force member
∑Fx=0
- FL0L1 + FL1L2 = 0
FL1L2 = 32.25 kN (Tensile)
FL1U1=0
FL0L1= 32.25kN FL1L2= 32.25kN
L0
12.9 kN
F L0L1
F L0U1
2.15 kN
18.45°
8.86kN
8.86kN8.86kN
8.86kN
4.43 kN 4.43 kN
4.43 kN4.43 kN
15. SRES’ Sanjivani College of Engineering, Kopargaon.
Structural Design I (Steel Structures) Prof. Gayake Sudhir B. (SPPU, Pune) Page 15
b) Member forces due to Live load- Similarly performing calculations for live load
the member forces are calculated as;
FL0U1= -55.296kN (Compressive)
FL0L1 = 52.45 kN (Tensile)
FL1L2 = 52.45 kN (Tensile)
FL1U1=0
c) Member forces due to Wind load- Similarly performing calculations for wind load
the member forces are calculated as;
FL0U1= 66.09 kN (Tensile)
FL0L1 = -61.25 kN (Compressive)
FL1L2 = -61.25 kN (Compressive)
FL1U1=0
Design force table
Members
Member force (kN) due to Design Forces (kN)
DL LL WL
1.5
(DL +LL)
1.5
(DL +WL)
1.2
(DL + LL+WL)
FL0U1 -34.00 -55.29 66.09 -133.93 +48.13 -27.840
FL0L1 32.25 52.45 -61.25 +127.05 -43.50 +28.14
FL1U1 0.00 0.00 0.00 0.00 0.00 0.00
FL1L2 32.25 52.45 -61.25 +127.05 -43.50 +28.14
By considering above forces and their nature i.e. negative force as compression
member whereas positive force as tension member can be designed as per given in Unit
No1 and Unit No2.