不同设计参数对高桩码头损伤和破坏特性的影响  

Influence of Different Design Parameters on the Damage and Failure Characteristics of High-piled Wharves

作　　者：宋波[1,2] 何宇鑫 王海龙 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]强震区轨道交通工程抗震研究北京市国际科技合作基地,北京100083

出　　处：《地震工程学报》2017年第6期1126-1133,共8页China Earthquake Engineering Journal

基　　金：国家自然科学基金项目(51178045)

摘　　要：基于相同结构不同设计参数的高桩码头建立计算模型,研究两种结构自身动力特性的差异以及在地震作用下抗震性能的差异。研究表明:在相同荷载条件、场地条件、材料用量的前提下六桩码头的刚度要大于八桩码头;天津波作用下六桩码头的桩身加速度响应较大,且两种结构桩身加速度差异值随着震度的增大而增大;在相同峰值的罕遇地震下六桩码头的桩顶位移响应要小于八桩码头,而其残余位移要大于八桩码头;相同荷载条件下八桩码头的延性能力明显强于六桩码头,其极限塑性率是六桩码头极限塑性率的2.28倍;八桩码头在峰值加速度为800gal地震作用下达到极限曲率,六桩码头在峰值加速度为1 150gal的地震作用下达到极限曲率。Two high-piled wharves with same structure but different design parameters were examined to determine the design influence on damage and failure characteristics.The first wharf comprised eight piles,each with a pile diameter of 1.2 mand a wall thickness of 22 mm.The second wharf comprised six piles,each with a pile diameter of 1.6 mand a wall thickness of 16 mm.The differences in dynamic characteristics and seismic performance of the two wharves were studied using the finite element software ANSYS.Both types of piles were simulated by BEAM188 element and the nonlinear spring was simulated by COMBINE39 element.The results show that under the same condition of load,site,and material usage,the stiffness of the six-pile wharf is greater than that of the eight-pile wharf.When the wharves were examined under the influence of a Tianjin wave,the pile acceleration of the six-pile wharf is larger than that of the eight-pile wharf,with the difference increasing with the strength of the seismic degree imposed.Under a rare earthquake,the displacement at the top of the six-pile wharf is less than that of the eight-pile wharf,but the residual displacement of the six-pile wharf is greater than that of the eightpile wharf.Under the same condition of load,the ductile capacity of the eight-pile wharf is obvious greater than the six-pile wharf,and the limit plastic rate of the eight-pile wharf is 2.28 times that of the of six-pile wharf.With peak acceleration of 800 gal,the eight-pile wharf approaches the ultimate curvature,whereas the six-pile wharf approaches the ultimate curvature when the peak acceleration is 1 150 gal.Thus,it is important to comprehensively consider the stability and ductility capacity of the structure.

关 键 词：高桩码头 地震 桩数 抗震性能 

分 类 号：TU443[建筑科学—岩土工程]