Project Report of G+25 Story Building

Master study in high rise & tall structure project report (DBR) For G+25 High Rise commercial Apartment

Design Methodology

Limit state method is used for the design of the structure. In this method, each member of the  structure is designed to satisfy Serviceability and collapse criteria.

Section 5 of I.S. 456-2000 has given clear guidelines for Limit state method of design. The same design is adopted  with the suggested Characteristic loads of I.S 875-1987.

Taking Architectural plan as base, the column positions are decided to provide proper structural frame  without disturbing the parking plan. Column orientation is taken to provide maximum rigidity along spans and  also proper Resistance to lateral (wind& earthquake) loads.

Project Information

Material Properties

Frame Section Properties

Slab Properties

Frame loading

Seismic Base Shear

StaticAnalysisBaseShear=Vb =Ah.W

Where,

Ah= Design horizontal acceleration spectrum value as per using the fundamental  Natural period Time period

W= Seismic weight of the building  Qi = Vb x ∑Wihi² / ∑(Wihi)²

Where,

Qi =Design lateral force at floor

Wi =Seismic weight of floor

hi =Height of floor i measured from base

Building Location

Zone

Seismic zone factor (Z)  Site Type

Importance factor  Response Reduction, R

III

: 0.24 (As per 1893 (Part-1):2016, Table-3)

: II (Soft Rock)

: 1.2 (As per 1893 (Part-1):2016, Table-8)

: 4 (Ductile Shear Wall)

Time Period= 0.09h/√d

At X direction = 0.09h/√d = 1.15 Sec  At Y direction = 0.09h/√d = 0.94 Sec  Ah = Z/2 x I/R x Sa/g,

Where,

Z= Zone Factor

I = Importance Factor

R= Response Reduction Factor

Sa/g = Average response acceleration coefficient

Earthquake Design  Stability Checks

IS1893:2016 Auto Seismic Load Calculation

This calculation presents the automatically generated lateral  seismic loads for load pattern EQX according to IS  1893:2016, as calculated by ETABS.

Direction and Eccentricity

Direction = X

Eccentricity Ratio = 0% for all diaphragms

Structural Period

Period Calculation Method = Program Calculated  Factors and Coefficients

Seismic Zone Factor, Z [IS Table 3]  Response Reduction Factor, R [IS Table 9]  Importance Factor, I [IS Table 8]

Site Type [IS Table 1] = II

Seismic Response

Spectral Acceleration Coefficient, S a /g [IS

6.4.2]

Equivalent Lateral Forces

Seismic Dynamic Base Shear

Modal Analysis

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