系梁设置对双肢薄壁刚构桥地震响应影响分析  

Effect of tie beam on seismic response of rigid frame bridge with double-leg thin-walled piers

作　　者：陈彦江[1] 郝朝伟 李勇[2] 

机构地区：[1]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124 [2]清华大学土木工程系,北京100083

出　　处：《自然灾害学报》2015年第4期63-70,共8页Journal of Natural Disasters

基　　金：国家自然科学基金项目(51378037;90715032);中国博士后科学基金项目(2013M540957)

摘　　要：以一座典型双肢薄壁刚构桥为工程背景,采用增量动力分析(incremental dynamic analysis,IDA)方法,考虑行波效应,分析了系梁道数、系梁刚度等参数对桥梁远场地震响应的影响。结果表明,与系梁位置和刚度相比,地震响应受系梁道数影响较大;设置1道系梁可以明显降低支座在地震中的响应;设置2道以上系梁时,墩内、外肢地震响应差别显著,不利于发挥双肢墩材料性能。设置较多的系梁或者系梁位置不合理,易导致桥墩局部振动。对于跨度较大的髙墩刚构桥,当因其它因素需要设置较多系梁时,建议对行波效应进行专门的抗震效应研究。Based on a typical continuous rigid frame bridge with double-leg thin-walled high piers in mountain are- as, the influence of tie beam number and its stiffness on the far-field seismic response was reseached using incre- mental dynamic analysis （IDA） method, considering traveling wave effect. The results show that the number of tie beams has a remarkable effect on the seismic response of rigid bridge compared with the tie beam position and stiff- ness. What is more, the support response of the rigid bridges in earthquake is lower in case of one tie beam and for the rigid frame bridge with more than two tie beams, seismic responses of the internal and external limb will be strikingly different which is unfavourable for giving full play to both limbs thin-walled piers performance. The bridge with a little more tie beams or their unreasonable position, is prone to local vibration. For the larger span bridge of high piers with many tie beams because of other factors, it is suggested to do special seismic research when consid- ering traveling wave effect.

关 键 词：桥梁工程 地震响应 增量动力分析 系梁 双肢薄壁墩 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U448.23[交通运输工程—道路与铁道工程]