基于复合梁的钢桥面铺装断裂参数数值模拟  

Numerical Simulation of Fracture Parameter for Steel Deck Pavement Based on Compound Beam

作　　者：陈春红[1] 钱振东[2] 

机构地区：[1]常州大学环境与安全工程学院,常州213164 [2]东南大学智能运输系统研究中心,南京210096

出　　处：《武汉理工大学学报》2011年第12期65-69,共5页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50578038)

摘　　要：基于桥面铺装的裂缝特点及断裂力学理论,引入J积分并建立复合梁三点弯曲试验数值模型,研究了温度和初始缝高比对其断裂特性的影响。研究分析可得,随切口深度的增加,梁启裂、失稳时的J积分和裂纹的亚临界扩展量逐渐降低,启裂Jini的降低幅度比失稳扩展Jmax小;复合梁的Jini、Jmax和裂缝亚临界扩展长度随着环氧沥青混凝土的模量增大而变小。研究可为桥面铺装的抗裂设计提供依据,并为铺装结构的裂缝修补时机研究提供思路和参考。Based on crack characteristics of steel-deck bridge pavement and fracture mechanics,the J-integral was introduced to analyze numerical simulation test of single-edge notched three-point bending beams of compound beam.Its fracture properties were studied at different temperatures and different ratios of initial crack depth to beam height.The research results indicated that Jini of crack initiation and Jmax of crack unstability and subcritical crack propagation grow lower with the increase of notch depth.The downscale of the J-integral of crack initiation is lower than that of crack unstability.Jini of crack initiation and Jmax of crack unstability and subcritical crack propagation grow lower with the increase of modulus of asphalt concrete.The research findings are useful for anti-cracking design and crack repair time study of asphalt concrete pavement.

关 键 词：复合梁 虚裂缝扩展 数值模拟 断裂参数 

分 类 号：U443.33[建筑科学—桥梁与隧道工程]