底梁式全直桩码头结构的地震响应

Seismic response of pile supported wharf structure with mudsill

底梁式全直桩码头结构是近年来在长江中上游地区应用较多的结构形式,近年来该地区常常遭受地震灾害,有必要系统研究该新型结构的抗震性能,为其抗震设计提供参考。采用经典的EI-Centro地震波,研究了底梁式全直桩结构的自振特性,以及底梁布设和地震烈度对该结构的面板和桩基位移、桩身弯矩与损伤等的影响效应。分析结果表明,底梁布设有效提高结构刚度、减小桩基内力,从而改善结构抗震能力;其次,随着地震烈度的增大,面板和桩基的响应增大、损伤加剧,底梁设置对桩基侧移的降幅也相应增大,并与桩基处泥面高度相关,桩基弯矩的最不利位置也与该泥面高度相关。

The pile supported wharf structure with mudsill is widely applied in the regions on the upper andmiddle reaches of the Yangtze River in recent years.However, these regions are subjected to the earthquake disaster usually , and it is necessary to investigate the seismic performance of this new wharf structure for providing areference for the seismic design.The paper presents a study on the effect of mudsill and seismic intensity on thenatural vibration characteristics , displacement of decks and piles , moment and damage of piles through seismic response analysis using EI-Centro seismic wave.The analysis results indicate that the use of mudsill is beneficial to promote the structural stiffness and reduce the internal force of piles , resulting in improved seismic performance; with increasing of seismic intensity the dynamic response of decks and piles is enhanced and thus the damage aggravates , the reduction extent of pile horizontal displacement due to use of mudsill increases and is related to theheight of mud surface at piles , and the most adverse position of moment is also related to this height.