全直桩码头结构的静力与动力弹塑性分析

Static and Dynamic Elastic Plasticity Analysis of All-vertical-piled Wharf Structure

以江苏国华镇江港全直桩码头结构段为研究对象,针对全直桩码头的结构特点,基于《水运工程抗震设计规范》中的抗震计算方法,采用动力弹塑性分析方法和静力弹塑性分析方法,计算得到了码头结构的基底剪力—桩顶位移关系曲线、桩顶最大位移、塑性铰分布。结果表明,利用两种方法计算得到的基底剪力—桩顶位移曲线相关不明显;利用动力弹塑性方法得到的桩顶最大位移与利用静力弹塑性方法得到的性能点目标位移相差不大;两种方法分析得到的塑性铰位置分布相接近,即塑性铰主要分布在桩底和桩顶,并首先出现在陆侧桩底,然后向海侧发展,但利用静力弹塑性方法得到的塑性铰较多,分析结果偏保守。

Taking all-vertical-piled wharf structure of Guohua Zheniiang Port in Jiangsu Province for an example, ac- cording to the characteristics of all-vertical piled wharf, based on the seismic calculation method of the Code of earthquake resistant design for Water Transport Engineering, static and dynamic elastic plasticity analysis methods are used to calcu late the displacement curve of base shear-pier top, the maximal displacement of pier top, the distribution of plastic hinge. The results indicate that the base shear is not obvious related to the pier top displacement curve; the maximal pier top dis- placement of dynamic elastic plasticity method is close to the displacement of performance point of pushover method; the distribution of plastic hinge obtained by two methods is close, mainly in the bottom of the pile and the pile top, the plastic hinge appears firstly in the bottom of the landside pile, and then expands to the sea side; in pushover method, there are more plastic hinges, the result is conservative.