非规则连续梁桥纵向非同向振动地震反应

Longitudinal seismic response of out-of-phase vibrations of continuous girder beidges with unconventional configurations

墩高不同可以造成桥梁相邻跨之间的振动特性存在显著差异,这种差异会导致产生非同向振动,并对相邻梁体地震碰撞力及构件间相对位移有影响,另外对抗震措施的有效性也有影响。主要完成的工作:(1)选择了一座代表性的墩高变化较大的实际非规则连续梁桥,采用成熟建模方法和软件建立了计算模型;(2)选择了多条代表性地震波,进行了纵向地震反应计算;(3)根据案例的计算结果,研究了相邻联周期比对该类桥梁地震反应的影响规律;(4)根据案例的计算结果,建议了周期比的合理取值范围和抗震措施的设计原则。

Different height of piers makes significant differences in vibration characteristics of adjacent bridge span. The differences will lead to out - of - phase vibrations and have an impact on the pounding of adjacent girders at the movement joints, relative displacements and the validity of anti - seismic measures. This paper completes the follow- ing work ： （ 1 ） Select a representative actual continuous girder bridges with unconventional configurations which the height of piers varies greatly, established the calculation model by using the mature modeling method and software. （2） Choose severalrepresentative seismic waves, calculate longitudinal seismic response. （3） According to the results, study the effect of the periods of adjacent girders on seismic response. （4） Appropriate period ratio of adjacent girders and the selection principle of anti - seismic measures are introduced.