水平地震作用下高桩码头桩基内力增大系数研究  

Investigation on the increase coefficient of pile foundation internal forces in high-pile wharves under horizontal seismic action

作　　者：高树飞 荆范礼 冯云芬[1] GAO Shufei;JING Fanli;FENG Yunfen(School of Architecture and Civil Engineering,Liaocheng University,Liaocheng 252000,China)

机构地区：[1]聊城大学建筑工程学院,山东聊城252000

出　　处：《水利水运工程学报》2024年第6期115-125,共11页Hydro-Science and Engineering

基　　金：山东省自然科学基金资助项目(ZR2024ME140);聊城大学科研基金资助项目(318012111)。

摘　　要：为更加简便地确定高桩码头在双向水平地震作用下的桩基内力,提出将码头在横向地震作用下的桩基内力乘以增大系数得到总内力的计算方法。为得到增大系数的解析表达式,将码头实际的离散化桩基等效为连续的桩基,并考虑双向水平地震惯性力同时作用在码头的2个主轴方向,基于静力平衡条件进行计算式推导。为验证所提出计算式的合理性和准确性,选取20组双向水平地震动记录,对不同长宽比、偏心率的码头进行时程分析,确定相应的内力增大系数,并与计算式的结果进行对比。研究表明,桩基内力增大系数计算式可以表示为码头长宽比和偏心率的函数,且具有一定的普遍适用性和计算精度,可代替复杂双向水平地震作用下的地震反应分析。To simplify the determination of pile foundation internal forces in high-pile wharves under bidirectional horizontal seismic action,this study proposes a calculation method whereby the internal forces under lateral seismic action are multiplied by an increase coefficient to obtain the total internal forces.To derive an analytical expression for the increase coefficient,the actual discrete pile foundation of the wharf is approximated as a continuous pile foundation.This approach considers the simultaneous action of bidirectional horizontal seismic inertia forces along the two principal axes of the wharf and is based on the conditions of static equilibrium.To verify the rationality and accuracy of the proposed calculation method,a time history analysis was conducted using 20 sets of bidirectional horizontal seismic records.This analysis considered wharves with different length-to-width ratios and eccentricities to determine the corresponding internal force increase coefficients,which were then compared with the results from the analytical expression.The study indicates that the calculation formula for the internal force increase coefficient can be expressed as a function of the length-to-width ratio and eccentricity of the wharf.This method offers a generally applicable and precise alternative to the complex seismic response analysis under bidirectional horizontal seismic motions.

关 键 词：高桩码头 水平地震作用 桩基内力 增大系数 扭转效应 

分 类 号：U656.113[交通运输工程—港口、海岸及近海工程]