缓冲型拉索减震支座拟静力试验及减震效果分析

Quasi-static test on buffer cable sliding friction aseismic bearing and analysis of its seismic performance

为了能够更有效地解决桥梁在地震中的力与位移平衡的问题,结合拉索减震支座的构造特点,提出了缓冲型拉索减震支座的构想,介绍了其工作原理以及实现方式,对常规拉索减震支座及缓冲型拉索减震支座进行拟静力试验,并将试验结果进行对比研究.在试验结果的基础上提出了缓冲型拉索减震支座的数值模拟方法,并验证了所提方法的正确性.最后,针对一座实际的连续梁桥,选用3条近场脉冲型地震波,分析采用拉索减震支座以及缓冲型拉索减震支座下的支座减震效果.结果表明:相比于拉索减震支座,采用缓冲型拉索减震支座可以使结构的峰值支座位移、墩底最大弯度以及残余位移均有不同程度的降低,具有更好的限位能力和自复位能力.

To achieve a balance between force and displacement of bridges under earthquakes,a buffer cable sliding friction aseismic bearing(BCSFAB)was proposed on the basis of cable sliding friction aseismic bearing(CSFAB).The concept and the working mechanism of BCSFAB were introduced.A quasi-static test was carried out on CSFAB and BCSFAB,and test results were compared.Then,the numerical simulation method for BCSFAB was proposed and validated.Finally,by taking a continuous girder bridge as the research object,the seismic performance of BCSFAB and CSFAB under three near-field pulse-type waves was analyzed respectively.Results show that compared with CSFAB,BCSFAB performed better in reducing the peak displacement of bearing,maximum bending of pier bottom,and residual displacement of the structure,which has better limiting ability and self-centering capacity.