非规则曲线桥梁地震模拟振动台试验研究  

Experimental study on shaking table of irregular curved bridge

作　　者：闫磊[1] 李青宁[1] 尹俊红[1] 程麦理 YAN Lei LI Qingning YIN Junhong CHENG Maili(School of Civil Engineering, Xi＇ an University of Architecture and Technology, Xi＇ an 710055, China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《世界地震工程》2016年第4期1-6,共6页World Earthquake Engineering

基　　金：国家自然科学基金项目(51078306);陕西省自然科学基础研究计划资助项目(项目批准号2013JQ7007);高等学校博士学科点专项科研基(20106120110004)

摘　　要：目前对于S形曲线桥梁在地震激励下的动力响应尚缺乏试验研究。以一座S形钢筋混凝土曲线桥梁工程为对象,设计和制作了一座相似比为1/20的模型桥梁,通过对模型桥震害现象以及各测点应变、加速度、位移响应的分析研究了该桥梁的抗震性能及抗震能力。研究表明:在整个测试过程中桥墩钢筋均未屈服;小震输入时,桥墩墩底加速度峰值小于墩顶,墩梁径向相对位移大于切向相对位移;大震输入时由于桥墩出现较严重的扭转,导致墩顶加速度峰值小于墩底,墩梁的径向相对位移小于切向相对位移。因此在此类桥梁设计时应严格控制桥墩扭转,防止因扭转而导致桥梁失稳破坏;同时应控制墩梁的相对位移,严防落梁等地震灾害的发生。Until now, there is few experimental researches on dynamic response of S-shaped curve bridge under the earthquake. A S-shaped curve bridge model with similarity of 1：20 was designed according to a practical S-shaped reinforced concrete curve bridge, the seismic performance and capacity were researched through analysis of earthquake damage phenomena and responses of each measuring point, such as strain, acceleration and displacement. The experimental resules indicate that the reinforcements of pier did not yield during whole test, and the acceleration peak value of pier top is larger than that of the pier bottom, in addition, the radial pier girder relative displacement is larger than its tangential relative displacement when the small earthquake occurs in the model bridge, but when strong earthquake attacks, the acceleration peak value of top pier is less than that of the bottom of the pier and radial pier girder relative displacement is less than its tangential rela- tive displacement as the result of serious torsion of piers. Therefore, in order to prevent instability dne to torsion, bridge designers should take strictly measures to control torsion of pier in S -shaped curve bridge. Meanwhile, the relative displacement of the pier girder should also be controlled to prevent strictly serious seismic damage as fall of beam.

关 键 词：S形曲线桥梁 振动台试验 应变 加速度 相对位移 

分 类 号：TU4[建筑科学—土工工程]