Dbr kashmiri gate

Structural Design Basis Report
Of
Commercial Building and Kashmiri Gate
Nov 2016
Engineering Design and Research Pvt. Ltd.

P: +91 124-4113252 | M: +F: +91 124-4113252
Index
Issue/revision Issue 1 Revision 1 Revision 2 Revision 3
Remarks
Date 09-11-2016
Prepared by
Signature
Checked by
Signature
Authorised by
Dr. Santosh
Kumar Singh
Signature
Project number
File reference

Sr. No. Particulars
1.0 Introduction
2.0 Description of Project
3.0 Structural System
4.0 Design Loads
4.1 Gravity Loads
4.2 Lateral Loads
5.0 Load Combination
6.0 Live Load reduction
7.0 Deflection and Drift Limits
8.0 Miscellaneous Design Criteria
9.0 Material Strengths
10.0
Structure modeling &Computer Programs
11.0 Design Standards and References
12.0 Units
1.0 INTRODCTION

Project Name : Commercial Building Kashmiri Gate
Usage : Commercial Building
Location : Plot No. 1546, Ward No. 1, Kashmiri Gate, Delhi
Owner : Mr. Praveen
Architect : Fidesto Projects Private Limited
Structure Consultant : Engineering Design and Research Pvt. Ltd.
This report covers the structural design basis criteria for design of Commercial Building at Kashmiri
Gate. This report is dynamic in nature, will be updated at various stages of project to document the
design criteria being followed. Design has been done on the basis of client inputs and all relevant
approvals should be done by the client.
2.0 Description of Project :
The RCC building with Basement+G+4+2 Floor Extra is proposed to be constructed in composite
Steel frame structure using fabricated section with yield strength of plate 350 N/mm2
.
3.0 Structural System
SUPERSTRUCTURE-
The super structure system is proposed as ductile composite steel frame construction as per
requirement of seismic design for zone IV. The fabricated I section incased in M30 Grade concrete is
used as composite steel column. Beam is incased I section constructed as composite with RCC slab.
The RCC slab is proposed to be constructed using shuttering instead of using the deck sheet. The
provision of cantilever up to 2 m on each floor at periphery is considered in design as per client
instruction.
SUBSTRUCTURE:
Based on the soil report the foundation system proposed is 500 mm thick raft.
Summary of Soil Report:
• Soil investigation is done by Geocon (India) and associates. The investigation is based on 2
bore holes of 10.45 meter depth.
• Ground water found at 3.1 meter depth from EGL and soil investigation was conducted in
moth of September -2016.
• The recommended net SBC at 5 meter depth is 180 kN/m2
• Raft foundation of 500 mm thickness is adopted in the design

The additional uplift hydraulic pressure from ground water is considered in design of raft. The total
uplift due to ground water table is balance from weight of the building. However during the
construction till weight of building equated the water uplift pressure (Construction of slab up to 2st
floor
level), dewatering arrangement shall be done.
4.0 Design Loads
4.1 Gravity Loads
The general design loads used in the design for Dead and Live loads are given below.
Self Weight of Structure
Dead loads are calculated using the following material densities:
Reinforced Concrete (normal weight) 25 kN/m3
Steel 78.50 kN/m3
Superimposed Dead Loads
The following allowances for superimposed dead loads are used in the preparation of vertical
load rundowns.
Finishes on floors (75 mm) 1.5 kN/m2
On terrace in general 5 kN/m2
Masonry work-AAC Block 8 kN/m3
Live Loads – General
Live loads assumed for each occupancy area are as follows:
Uniform Load (kN/m2
)
1. Shops and Storage 7.5
2. Corridors 5.0
3. On Terrace 5.0
4.2 Design lateral Loads
Wind Loads
The wind pressure is calculated as per IS875-Part3, using the input parameters as provided
below
Basic Wind Speed Vb = 47 m/sec
Probability Factor K1 = 1.0
Terrain, height and
Structure size factor K2 = 1.0
Topography factor K3 = 1.0
The wind load is applied in ETABS by defining the wind parameters and program calculates the wind
load automatically.

Seismic Loads
The seismic load is calculated as per IS1893-Part1 – 2002, using the input parameters as provided
below
Zone factor (Z) = 0.24
Importance Factor (I) = 1.00
Response Reduction Factor (R) = 5
5.0 Load Combinations
For design of the structure all possible load combinations shall be checked for getting the highest
possible stresses in members. The factor of safety on various load combinations is used as per Indian
code for limit state design. The minimum mandatory load combinations as per guidelines of design
codes are listed below for limit state design
1.5 DL +1.5 LL
1.5 DL ±1.5 EQ or WL
1.2 DL +1.2 LL ±1.2 EQ or WL
0.9 DL ± 1.5 EQ or WL
Where DL is Dead load, LL is live load, EQ is earthquake load and WL is wind load
While considering the effect of EQ / WL, the load is applied from all four principal directions and load
combinations accordingly used in the analysis
To check the deflections and drift service load combinations are used as mentioned below
1 DL + 1 LL
1 DL +1 LL ±1 EQ or WL
The various load combination used in the analysis is defined in ETABS Model
6.0 Live Load Reduction
The live load reduction is applicable in design, and considered as per IS 875 Part-II for design of
columns and foundations.
7.0 Deflection and Drift Limits
• Over all deflection under wind load are limited to H/500
• Seismic interstorey inelastic drifts are limited to 0.004 times the storey height.
• The long term deflection limits for beams / slabs is considered as span/250.
• The long term deflection limits for cantilever beams / slabs is considered as span/125.
The maximum storey drift has been checked against the limits and found to be satisfactory for all
lateral load cases.
8.0 Miscellaneous Design Criteria
Reinforcement Cover
Table: Reinforcement Cover for Building Elements
Building elements Cover (mm)

Superstructure
Columns
Slabs
Beams
Walls
40
25
30
30
Substructure
Isolated footing on PCC
Raft / Footing resting on soil
50
50
Fire Rating:
The two hour fire rating is considered in design. All member sizing / cover thickness considerations
are taken accordingly for structural design.
9.0 Material Strength
Concrete Strength
The grade of concrete to be used for construction is:
Foundation M30
Water Tank M30
Columns M30
Shear Walls M30
Floor slab / beams M30
Staircase M30
For calculations of concrete covers and minimum grade of concrete, Mild Exposure
Condition is considered for this project site.
Steel Reinforcement
Steel Reinforcement TMT bars Fe 500 confirming to IS1786:2008
Structural Steel
Fabricated section with yield strength of plate 350 N/mm2
10.0 Structure modeling & Computer Programs
3-D Analysis of all the building structures is being done using ETABS, for gravity and lateral loads.
The design of columns and beams is done using ETABS for all possible load combinations and
governing design for critical load is adopted for reinforcement detailing. Analysis and design of
foundation systems are being carried out using SAFE. Slab is being design manually using excel
sheet.
COMPUTER PROGRAMS USED FOR ENGINEERING CALCULATIONS
ETABS
SAFE
AUTOCAD
MS EXCEL

11.0 Design Standards and References
Statutory Codes of Practice
The structure is designed to the requirements of the following standards:
IS:875 (Part-2)-1987 Code of Practice for Design Loads (Other than Earthquake)
for Building and Structures-Imposed loads
for Buildings and Structures –Wind Load.
for Buildings and Structures – Special Loads and Load
Combinations
IS:456 -2000 Code of Practice for Plain and Reinforced Concrete
IS:1893 (Part-1)-2002 Indian Standard Criteria for Earthquake Resistant Design of
Structures
IS:1786-2008 Specification for High Strength Deformed Steel Bars and
Wires for Concrete Reinforcement
IS:13920-1993 Ductile Detailing of reinforced concrete structures subjected
to seismic forces – code of practice (Reaffirmed 1998)
IS 800-2007 General Construction in Steel – Code of Practice .
12.0 Units
The structural calculations will be completed using the following units
Length m and mm
Mass kg and ton
Force N and kN
Stress N/mm2

Dbr kashmiri gate

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