桥梁用高强钢防断评价研究综述

桥梁用高强钢的低温断裂问题一直是桥梁钢结构设计研究中的热点问题。为了深化对高强度桥梁钢断裂问题的认识,从高强钢的断裂韧性及其评估方法、现行高强钢断裂韧性研究存在的主要问题等方面,系统总结并讨论了高强桥梁钢防断评价研究的现状和发展趋势。高强钢断裂韧性是由多个复杂因素共同决定的弹塑性断裂力学问题,其破坏形式、服役工作温度、使用板厚、材料材质组织均匀性等问题较为复杂。高强钢的断裂韧性试验、防断评价方法及其适用性是钢结构构件防断设计理论的重要基础和防断问题持续深化研究需要迫切解决的问题。

Research Review on Evaluation of Fracture Resistance of High Strength Steel for Bridges

The low-temperature fracture problem of high-strength steel for bridges has always been a hot topic in the research of bridge steel structure design.In order to deepen the understanding of the fracture problem of high-strength bridge steel,the present situation and development trend of high-strength bridge steel fracture evaluation research were systematically sumarized and discussed from the aspects of fracture toughness of high-strength steel and its evaluation methods,and the main problems in the study of fracture toughness of high-strength steel.The fracture toughness of steel is an elastoplastic fracture mechanics problem determined by a number of complicated factors.Furthermore,the failure mode,service temperature,plate thickness and uniformity of material are more complicated.Fracture toughness test,evaluation method of steel fracture prevention and its applicability are the important basis of the theory of fracture prevention design of steel member.Also,they are the urgent research topics of sustainable deep research of the fracture prevention.