【摘要】 在各类地震序列中,主-余震所占比例最大。主震震级越高其余震的震级亦越高,对结构的破坏越大。桥梁结构作为重要交通枢纽工程,其在整个地震序列发生时应确保通行,起到生命线工程的作用。选用集集地震序列对桥梁结构进行非线性时程分析,发现结构在主震作用下梁墩相对位移过大、主梁发生落座,余震作用下结构有发生落梁的可能。对结构设置防落梁装置,并进行非线性时程分析,结果显示连梁装置可有效抑制桥梁上、下部结构相对位移,提高结构抗推能力与整体性,保证了结构在整个地震序列中不发生落梁震害。在抗震分析中,应考虑到强余震对结构带来的影响,保证损伤结构在地震序列中的安全。更多还原

【Abstract】 Main shock-aftershock earthquake sequences are dominant in almost all kinds of earthquakes. A main earthquake of a lager magnitude has heavier destructive aftershocks and huger destructive force. As an important part of lifeline engineering,bridges are hoped to be secure during an earthquake. Unseating prevention devices can provide ultimate security to a bridge structure under earthquake,increase the integrity and antipushing rigidity of the structure,and the bridge could thus safe in aftershocks without collapse. It is quite necessary to analyze anti-seismic performance of bridges under strong aftershocks to protect bridges from being destroyed in an earthquake sequence.更多还原