LEBANESE UNIVERSITY FACULTY OF ENGINEERING BRANCH II ROUMIEH

LEBANESE UNIVERSITY FACULTY OF ENGINEERING BRANCH II - ROUMIEH 1

Evaluation of the Static Seismic Base Shear Using IBC 2012 and ASCE 7 -10 Prepared by Eng. Wassim J. Elias Supervised by Dr. Michel F. Khouri 2

Introduction The purpose of the earthquake provisions herein is primarily to safeguard against major structural failures and loss of life, not to limit damage or maintain function. The seismic base shear V in a given direction shall be determined in accordance with the following equation: V = Cs. W Cs = the seismic response coefficient. W = the effective seismic weight. 3

Base Shear Distribution 4

Calculation of the effective seismic weight “W” 5

Calculation of the seismic response coefficient Cs 6

Calculation of the seismic response coefficient Cs 7

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n 10

n 11

Site Classification The site soil shall be classified in accordance with the following table: n 12

Site Classification 13

Risk Category of Structures The risk category of buildings and other structures for flood, wind, snow, earthquake and ice loads can be chosen according to the following table: 14

Importance Factor and Seismic Design Category SDC Calculation n 15

Response Modification Coefficient “R” Calculation The response modification coefficient R can be chosen according to the following table: 16

Response Modification Coefficient “R” Calculation 17

Response Modification Coefficient “R” Calculation 18

Response Modification Coefficient “R” Calculation 19

Response Modification Coefficient “R” Calculation 20

Response Modification Coefficient “R” Calculation 21

Response Modification Coefficient “R” Calculation 22

Response Modification Coefficient “R” Calculation 23

Response Modification Coefficient “R” Calculation 24

Response Modification Coefficient “R” Calculation 25

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Where the values of mapped long-period transition period are given in the following maps: 27

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Application on the IBC 2012 and ASCE 7 -10 32

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Seismic Design Category SDC 37

Seismic Design Category SDC The Risk Category is II & Seismic Design Category SDC=E, can be chosen according to the following tables 1. 5 -1 & 38 11. 6 -1, 2:

Seismic Design Category SDC & Risk Category 39

Response Modification Coefficient 40

Importance Factor The importance factor by risk category of buildings and other structures for snow, ice and earthquake loads can be chosen according to the following table: 41