全直桩码头结构振型反应谱抗震分析

针对全直桩码头结构形式,以国外某码头工程为研究对象,采用振型分解反应谱法对不同水平地震方向激励进行纵横轴不对称结构动力响应分析,探讨了在不同水平地震方向作用下桩基结构位移和内力的变化规律。计算结果表明:结构平面质量中心和刚度中心不重合时,水平扭转效应对结构受力影响明显,结构地震作用及其扭转耦联振动效应可采用振型分解反应谱法计算;在水平地震作用下,全直桩码头结构的近陆侧桩承担的水平地震力最大,边桩比中间桩群承担了更多的水平地震力,设计中应重视边角桩的受力情况及调整桩基布置形式来减小扭转产生的不利影响。

Seismic analysis of the modal of vibration response spectrum for pile supported wharf structure

Considering the structure of pile supported wharf,the response spectrum method was used to analyze the seismic response under different horizontal earthquake directions in a foreign wharf engineering project.The change rule of the structure displacement and internal force of pile foundations under the influence of different direction of earthquake is compared and studied.The results show that horizontal torsion effect has a significant influence on structure and the seismic effect of wharf structure should be calculated by translation-torsion coupling mode-superposition method while the center of mass and rigidity are inconsistent.In the condition of horizontal direction earthquake effect,the horizontal seismic force of pile closed to the landside is the biggest while the horizontal seismic force of side pile is bigger than that of middle pile group.The force influence of corner pile must be check and taken in account and the pile arrangement shall be adjusted to reduce the adverse effect caused by structure torsion during design project.