地震作用下双肢薄壁空心墩塑性铰区域形成规律及系梁的影响  

Formation law of plastic hinge region of double-limbed thin-walled hollow pier under earthquake action and the effect of tie beam

作　　者：马沂帆 宁晓骏[1] MA Yifen;NING Xiaojun(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming Yunnan 650500,China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650500

出　　处：《工业安全与环保》2023年第5期15-19,共5页Industrial Safety and Environmental Protection

基　　金：国家自然科学基金(51068012)。

摘　　要：为了探究双肢薄壁空心墩在地震作用下塑性铰的形成与分布规律,对某高速刚构桥梁的桥墩进行全尺寸建模,使用ABAQUS对其进行非线性时程分析。研究发现:无系梁模型有两处塑性铰,墩顶塑性铰最先形成,随着刚度退化墩底塑性铰才形成;单系梁模型有3处塑性铰,系梁处最先形成塑性铰,而后墩底与墩顶才形成,但墩顶塑性铰耗能贡献占比小;各塑性铰区域内,最早产生塑性变形与损伤的部分为墩身实心段与空心段交界处。In order to study the formation and distribution law of plastic hinge under the earthquake of a double-limb thin-walled hollow pig In this paper,the piers of continuous rigid-framed bridge in high way are modeled in full size and the nonlinear time history analysis is performed using ABAQUS.It is found that the untied beam model has two plastic hinges,the plastic hinge at the top of the pier is formed first,and the plastic hinge at the bottom of the pier is fbnned only with the degradation of the stiffiiess;the single tied beam model has three plastic hinges,the plastic hinge at the tied beam is formed first,and the plastic hinge at the bottom and top of the pier is formed later,but the top plastic hinge contribution to earthquake energy dissipation is much less;in each plastic hinge region,the earliest part of plastic deformation and damage is at the junction of the solid and hollow sections of the pier.

关 键 词：连续刚构桥 双肢薄壁空心墩 数值模拟 时程分析 塑性铰 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]