Chintanapakdee, Chatpan

Seismic Shear Demands of RC Core Walls for Design of Tall Buildings in Thailand

Abstract eng:
ASCE 7-10 allows practical engineers to use Response Spectrum Analysis (RSA) procedure to compute the design forces of the structures. However, it has been found to be inappropriate for seismic shear demands of reinforced concrete (RC) walls. This research aims to investigate the seismic shear demands of RC core walls from low-rise to high-rise buildings. Generic RC split core walls in 5 buildings varying from 5 to 25 stories subjected to ground motions in Bangkok and Chiang Mai of Thailand are first designed by RSA procedure in ASCE 7-10. Then, nonlinear response history analysis (NLRHA) is conducted to compute more accurate seismic demands of the structures. Two real tall buildings which represent common types of existing tall buildings in Bangkok are selected to study in order to confirm the finding of generic buildings. The results from both generic and real buildings demonstrate that shear demands of core walls from NLRHA are significantly larger than those from RSA procedure. The ratio between shear force from NLRHA and RSA procedure is defined as shear amplification. The shear amplifications of core walls in cantilever direction are larger than those in coupled direction. The two building locations having different spectrum shapes lead to different shear amplifications. Previous researchers’ equations can estimate shear forces of core walls determined by NLRHA only for buildings lower than 25 stories. They are no longer applicable for tall buildings in Bangkok except that shear magnification factor equation in EC8 can predict well the shear force from NLRHA even for tall building. In Bangkok, it is found that Rejec et al. (2012)’s equation can well estimate shear forces in cantilever direction of the core walls lower than 25 stories. In Chiang Mai, Luu et al. (2014)’s equation provides good estimation of shear forces in both directions of the core walls lower than 25 stories. Beside these two equations, the shear magnification factor equation in EC8 is found acceptable to be adopted to multiply with shear force from RSA procedure before using it as design shear force of RC core wall in both Bangkok and Chiang Mai.

Contributors:

Khy, Kimleng

Conference Title:

Proceedings of the 16th World Conference on Earthquake Engineering

Conference Title:

16th World Conference on Earthquake Engineering

Conference Venue:

Santiago (CL)

Conference Dates:

2017-01-09 / 2017-01-13

Rights:

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