【摘要】 以某客运专线上大跨连续梁桥为实际工程背景,研究了Lock-up装置对结构纵向抗震性能的影响。根据Lock-up装置在地震作用下具有反复锁止的受力特点,采用非线性时程分析方法,分析了锁止速度对结构减震性能的影响。结果表明:对于大跨连续梁桥,Lock-up装置能够充分发挥活动墩的抗震承载能力,有效地提高桥梁结构整体抗震性能。当锁止速度较小时,Lock-up装置可以采用大刚度连杆模拟,并假定其始终处于完全锁定状态。但当锁止速度较高时,应考虑Lock-up装置反复锁止的实际工作特点,否则应用上述计算方法所得的结果偏于不安全。更多还原

【Abstract】 Research on longitudinal seismic performance of the long span continuous girder bridge is presented.According to mechanical characteristic of the lock-up device locked repeatedly,the influnce of lock speed on seismic response reduction of the structure is analyzed by using the non-linear history analysis.The results show that seismic performance of whole long span continuous girder bridge is effectively improved because seismic bearing capacity of movable pier can be made full use of.When lock speed of lock-up device is relatively low,the device can be analyzed with large stiffness rod and assumed that the device is fully locked all the time.when lock speed is relatively high,the mechanical characteristic of the lock-up device locked repeatedly should be considered,otherwise the results obtained by above analytical method is unsafe.更多还原