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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。
In order to meet the demand of deformation caused by temperature load, the continuous girder bridge usually has only one fixed pier, which causes the longitudinal seismic load of the superstructure to be borne only by the fixed pier under the action of an earthquake, which can easily cause damage to the fixed pier and expansion joint and even cause Bridge down the bridge. In response to this problem, the idea of utilizing the seismic potential of sliding piers and cooperating with fixed piers to bear the earthquake action is proposed. A locking pin device activated by the acceleration of ground motion is developed. Through the installation of locking pin between the pier and beam, The relative displacement of the sliding pier and the beam body is limited so that the sliding pier and the fixed pier can work together to reduce the overall seismic response of the structure. Taking concrete engineering as an example, the damping principle and the parameters of the locking pin are analyzed. Effect of seismic effect. The research shows that setting the locking pin on the sliding pier can effectively reduce the longitudinal seismic response of the fixed pier and the girder and obviously improve the overall seismic performance of the continuous girder bridge. The damping effect is affected by the activation threshold of the locking pin acceleration and the lock Dead gap parameters such as greater impact.