考虑桩土相互作用的高桩码头体系等效阻尼比及Pushover分析  

Equivalent damping ratio and pushover analysis for pile-supported wharf system considering pile-soil interaction

作　　者：高树飞 贡金鑫[1] 冯云芬[2] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]聊城大学建筑工程学院,山东聊城252059

出　　处：《海洋工程》2015年第5期24-34,共11页The Ocean Engineering

基　　金：国家自然科学基金资助项目(51278081);交通运输部项目"强震区港口工程结构抗震设计研究"资助项目(JTSBD 2013 02130)

摘　　要：为考虑桩土相互作用的高桩码头体系等效阻尼比,将地震作用下高桩码头的滞回耗能定义为各桩塑性铰耗能和桩-土相互作用耗能之和,桩-土相互作用耗能根据p-y曲线和Masing准则定义的滞回环确定,码头结构的塑性铰总耗能为各桩塑性铰耗能的总和,按照正弦激励下一个振动循环内高桩码头体系与相应单自由度体系粘滞耗能相等的原则,推导得到了高桩码头体系等效阻尼比计算公式,并对两个高桩码头进行了Pushover分析。分析表明,土体耗能对高桩码头体系阻尼贡献较大,根据码头各桩塑性铰出现顺序和转动情况计算码头的等效阻尼比更符合实际情况。In order to determine the equivalent damping ratio for pile-supported wharf system considering pile-soil interaction,this paper features the incorporation of energy dissipated by soil and integration of energy dissipation of a single plastic hinge of piles in the pushover analysis of pile-supported wharf using capability spectrum method. The energy dissipated by soil is quantified based on the p-y curve of the soil springs and the Masing hysteretic rule,and the total energy dissipated by the structure is the sum of the energy dissipated by all the plastic hinges that appear in the piles corresponding to certain lateral displacement. The equivalent viscous damping ratio of pile-supported wharf system as a whole is derived through equating the energy dissipation of pile-supported wharf system with a corresponding viscous system in a complete cycle under sinusoidal excitation. In addition,two case studies are performed utilizing the proposed model. It indicates that it is more reasonable to account for the contribution of energy dissipation of pile-soil interaction and the energy dissipating mechanism of plastic hinge of piles for the response evaluation of pile-supported wharf by capacity spectrum method.

关 键 词：高桩码头 抗震设计 等效阻尼比 桩-土相互作用 滞回阻尼 PUSHOVER分析 

分 类 号：U656.1[交通运输工程—港口、海岸及近海工程]