Pradittan P.Ornthammarath T.Mahidol University2026-05-172026-05-172026-01-01Lecture Notes in Civil Engineering Vol.829 LNCE (2026) , 126-14123662557https://repository.li.mahidol.ac.th/handle/123456789/116792In designing earthquake-resistance structures, structural engineers need to evaluate seismic loads to assess the level of seismic demand for a particular building. Over time, many methodologies have been developed and the UHS is one of these methods used to do seismic analysis by using data from PSHA. But the consequences of using and combining the historical seismic event of the PSHA concept. The response spectrum from UHS will be considered the upper bound of the design, which means the selection of ground motions lacks realism. Compared to the modern method, The Conditional Mean Spectrum (CMS), This method provides a spectrum shape that better matches actual earthquake records for analysis. This study tries to compare the results of UHS and CMS to show the response of the building under 10 ground motions using these methods in nonlinear response history analysis (NLRHA) in FEM software. Furthermore, this study is trying to compare the results of using the post-tension slab and hollow core slab by using UHS and CMS with nonlinear response history analysis in FEM software under the assumption that the reduction of the structural weight, the base shear force that impacts to the building will decrease respectively.EngineeringConference PaperSCOPUS10.1007/978-981-95-7618-0_122-s2.0-10503845378423662565