连续梁桥锁死销减震机理及影响参数研究

发布时间：2019-01-10 07:46

【摘要】：连续梁桥为满足温度荷载引起的变形需求,一般只设一个固定墩,这致使在地震作用下上部结构的纵向地震荷载只由固定墩承担,这极易引起固定墩和伸缩缝破坏,甚至造成引桥落梁。针对这一问题,提出利用滑动墩的抗震潜能,协同固定墩共同承受地震作用的思想,研发了一种以地震动加速度激活的锁死销装置,通过在墩梁间设置锁死销实现在地震时限制滑动墩和梁体的相对位移,使滑动墩和固定墩协同受力,减小结构的整体地震响应,并以具体工程为例,分析了锁死销的减震原理及其参数对减震效果的影响。研究表明,在滑动墩上设置锁死销可以有效地减小固定墩和梁体的纵向地震响应,明显提高连续梁桥的整体抗震性能;其减震效果受锁死销加速度激活阀值和锁死间隙等参数影响较大。
[Abstract]:In order to satisfy the deformation demand caused by temperature load, the continuous beam bridge is usually equipped with only one fixed pier, which causes the longitudinal seismic load of the superstructure under earthquake action to be only borne by the fixed pier, which can easily lead to the destruction of the fixed pier and the expansion joint. It even causes the bridge to fall. In order to solve this problem, this paper puts forward the idea of using the seismic potential of sliding pier and cooperating with fixed pier to bear the earthquake action together, and develops a locking pin device which is activated by the acceleration of ground motion. The relative displacement of sliding pier and beam body is limited by setting locking pin between pier and beam during earthquake, so that the sliding pier and fixed pier are subjected to force together, and the overall seismic response of the structure is reduced, and the concrete project is taken as an example. The shock absorption principle of lock pin and the influence of its parameters on the damping effect are analyzed. The results show that locking pin on sliding pier can effectively reduce the longitudinal seismic response of fixed pier and beam body, and obviously improve the overall seismic performance of continuous beam bridge. The damping effect is greatly affected by the activation threshold of locking pin acceleration and locking clearance.
【作者单位】：北京工业大学建筑工程学院;石家庄铁道大学河北省交通应急保障工程技术研究中心;
【基金】：国家自然科学基金面上项目(51378034/E080505) 北京市自然科学基金面上项目(8122007)
【分类号】：U442.55

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