高烈度地震区桥墩加固方案的选择

以反应谱分析为例,推导了桥墩地震力与刚度的关系,并绘制地震力—刚度关系曲线图,证明在地震作用下,桥墩地震力会随其刚度的增大而激增。以某大桥为实例,针对桥墩缺陷位置提出了2种加固设计方案,分别计算2方案的地震响应和墩身、桩基的内力变化,指出了增加桥墩刚度对桩基的不利影响,提出高烈度地震区桥墩加固应优选不改变结构刚度的加固方案。

On Schemes of Strengthening Bridge Piers in Strong Earthquake-hit Areas

Taking response spectrum analysis as an example, this paper deduces the relationship between the seismic forces and rigidity on piers, and draws a seismic force-rigidity curve graph, aiming to prove that seismic force on piers increases sharply as the rigidity increases when earthquake happens. Taking a bridge with defects on its piers as a case, it proposes two strengthening design schemes, and then calcu- lates the inner force variation of seismic response and piers ＆ pile foundation respectively. It proves that the increasing rigidity of piers has adverse effects on the pile foundation and a scheme with no change of rigidity should be chosen in strong earthquake-hit areas.