全直桩与斜桩高桩码头结构地震动力损伤对比研究

Comparative study of seismic dynamic damage on vertical and batter pile-supported wharf structures

为探究斜桩与全直桩高桩码头结构受强地震作用的损伤特点,以一典型钢管高桩码头为研究对象,并以同一建设场地为背景,在相同服役条件及地质条件下,分别建立斜桩与全直桩高桩码头结构的有限元解析模型,进行结构体系的数值模拟仿真。通过桩体截面弯矩-轴力关系曲线,分析了全直桩码头、斜桩码头两种不同结构形式受不同水平地震作用下的动力响应特性及损伤特点,为高桩码头结构的设计与选型提供合理的依据和参照。研究结果表明,在斜桩结构的内力中,斜桩的轴力起主要支配作用,可有效分担地震的作用力,在输入地震动为350 gal时,考虑到结构的水平位移满足设计要求等因素,斜桩结构在抗震性能方面要稍优于直桩结构,在输入地震动为1 000 gal时,两种结构均发生了塑性破坏,通过塑性损伤开展以及对于地震能量的吸收与耗散的对比分析,得到全直桩结构具有优于斜桩结构的抗震性能的结论。

In order to study the seismic dynamic damage characteristics of vertical and batter pile-supported wharf structure, considering some typical steel pipe pile-supported wharf as a research object, the finite element analytical model of the batter and vertical pile-supported wharf structure was established respectively on the same construction site, service and geological conditions. By the numerical （M-N） relation curve, the dynamic response and damage simulation of structure system and the moment-axial force characteristics of the two different structures of batter and vertical pile under the different earthquake levels were analyzed to provide the reasonable grounds and reference for the design and selection of the pile-supported wharf structure. The study shows that the axial force of batter piles is dominant in the batter pile structure and can bear and share the seismic load effectively. Under the peak ground acceleration of 350 gal, considering the factors about the design requirement of horizontal displacement and so on, the batter pile structure is better than the vertical pile structure in the respect of seismic performance. Under the peak ground acceleration of 1 000 gal, plastic failure occurs in both of the two different analysis of the development of elasto-plastic damage performance of vertical pile structure is better and the absorption and dissipation batter pile structure. structures. By the contrastive of seismic energy, the seismic