基于振动台试验的曲线桥梁抗震性能研究

为了研究S形曲线梁桥在地震作用下的动力响应及抗震性能，设计并制作一座相似比为1／20的S形曲线梁桥进行振动台试验研究。结果表明：在地震作用下，S形曲线梁桥的梁体未有明显损伤，桥墩出现裂缝，支座破坏严重；在墩底屈服之前，墩梁已发生较大相对位移，桥梁极易发生落梁破坏现象；桥墩在大震作用下的扭转耗能作用十分明显。在振动台试验基础上，对S形曲线梁桥提出一种“梁体漂浮抗震设计”的概念设计方法，为该类桥梁的抗震设计理论提供支持。

Curved bridge seismic performance research based on the shaking table test

In order to study the dynamic response and the seismic performance of the S-shaped curve bridge,a 1/20 scale model of S-shaped curve bridge was designed and fabricated for shaking table test.Test results show that,during the earthquake,the beam of S-shaped curved bridge had no significant damage.However,some cracks appear in the piers,and the bearings was dam-aged seriously.Before the pier yield period,pier and beam has a larger relative displacement.The phenomenon of beam falling oc-curs easily andthe piers under earthquake reverses twist energy very obvious.On the basis of shaking table test,a conceptual de-sign which called“beam floating seismic design”was proposed to make a foundation for this kind of bridge seismic design theory.