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1.引言抗震设计技术的迅速发展可以使新设计的建筑物在地震中具有良好的抗震性能。同时,抗震设计方法的革新引起了对现有建筑物是否具有足够的抗震性能这样一些疑问。每当为了适应更为严格的要求而修订新的规范时,除了没有考虑抗震的很老旧的房屋
1. INTRODUCTION The rapid development of anti-seismic design technology can make newly designed buildings have good seismic performance in earthquakes. At the same time, innovations in seismic design methods raise questions about whether existing buildings have sufficient seismic performance. Whenever a new code is revised to meet more stringent requirements, except for earthquake-proof, very old houses