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During seismic shaking, columns are invariably subjected to bending in two orthogonal vertical planes, which leads to a complex interaction of axial force with the biaxial bending moments. This article compares the seismic performance of regular and symmetric RC moment frame buildings for unidirectional and bidirectional ground motions. The buildings are designed and detailed according to the Indian codes, which are at par with the other modern seismic codes. A fiber\u2010hinge model, duly calibrated with the biaxial experimental results, is utilized to simulate the inelastic behavior of columns under bidirectional bending. A comparison of the estimated seismic collapse capacity is presented, illustrating the importance of considering the bidirectional effects. The results from fragility analysis indicate that the failure probabilities of buildings under the bidirectional excitation are significantly higher as compared to those obtained under the unidirectional excitation.<\/jats:p>","DOI":"10.1177\/87552930211047879","type":"journal-article","created":{"date-parts":[[2021,11,10]],"date-time":"2021-11-10T00:58:52Z","timestamp":1636505932000},"page":"950-980","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":19,"title":["Effect of bidirectional excitation on seismic performance of regular RC frame buildings designed for modern codes"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0171-2758","authenticated-orcid":false,"given":"Payal","family":"Gwalani","sequence":"first","affiliation":[{"name":"Indian Institute of Technology Roorkee Roorkee India"}]},{"given":"Yogendra","family":"Singh","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology Roorkee Roorkee India"}]},{"given":"Humberto","family":"Varum","sequence":"additional","affiliation":[{"name":"CONSTRUCT\u2010LESE Faculty of Engineering University of Porto Porto Portugal"}]}],"member":"311","published-online":{"date-parts":[[2022,5]]},"reference":[{"key":"e_1_2_11_2_1","volume-title":"Report no. 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