摘要
针对既有铰缝损伤模型难以直接利用现场实桥裂缝常规检测信息的问题,提出一种将界面单元和工程中铰缝处横向开裂宽度和竖向错动检测数据相融合的铰缝损伤模拟新方法。基于试验曲线,通过理论解析获得了切向刚度与铰缝开裂和错动位移的变化规律,揭示了破坏过程中切向与法向的交互作用,给出了损伤状态下切向刚度与铰缝开裂大小的关系曲线,拟合建立了法向位移和切向位移与切向刚度的数值方程,据此可获得不同强度和粒径尺寸混凝土铰缝的刚度参数上限值,结合工程案例进行了仿真测试。结果表明:切向刚度随着裂缝宽度而递减,工作范围在0~0.4 mm;当裂缝宽度处于0~2 mm时,耦联刚度值不应忽略,并给出了与铰接板和刚接板相等效的界面单元切向刚度参数值。所做工作有助于促进界面单元在铰缝损伤模拟方面的实用化进程。
In order to directly use the conventional detection information on the actual joint crack,a new method of simu⁃lating the joint damage is presented by combining the lateral cracking width,vertical displacement of the joint and inter⁃face element.Based on experimental curve,the variation laws of tangential stiffness effected by joint cracking and verti⁃cal displacement is obtained by theoretical analysis,and the interaction between tangential and normal displacement dur⁃ing the failure process is revealed.According to the numerical fitting formulation established about tangential and normal displacement,the upper limit value of the stiffness parameter of concrete joints with different strength and particle size can be obtained,and its validity is tested by a engineering case.The results show that the tangential stiffness decreases with the increase of crack width,and its effective interval[0 mm,0.4 mm]of tangential stiffness to crack width is given.The coupled stiffness in less than 2 mm crack width should not be ignored,and the equivalent tangential stiffness value of the interface element to that of the hinge plate and rigid plate is given as well.All those will be helpful to promote the practical process of interface element in the simulation of hinge damage.
作者
李炫钢
黄海新
安帅锟
LI Xuangang;HUANG Haixin;AN Shuaikun(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China)
出处
《河北工业大学学报》
CAS
2020年第4期62-68,共7页
Journal of Hebei University of Technology
基金
河北省科技计划(15215431)
旧桥检测与加固技术交通行业重点实验室(北京)开放课题。
关键词
桥梁工程
接触力学
有限元分析
装配式空心板桥
界面单元
bridge engineering
contact mechanics
finite element analysis
assembly type hollow slab bridge
interface element
