带裂纹的悬索桥主缆钢丝的断裂强度分析  

Fracture Strength of Wires with Cracks in Suspension Bridge

作　　者：曾勇[1] 陈艾荣[1] 马如进[1] 

机构地区：[1]同济大学桥梁工程系,上海200092

出　　处：《同济大学学报（自然科学版）》2009年第8期1010-1013,1108,共5页Journal of Tongji University:Natural Science

基　　金：国家"十一五"科技支撑计划资助项目(2006BAG04B01;2006BAG04B02);国家"八六三"高技术研究发展计划资助项目(2007AA11Z104);上海市科委重点攻关资助项目(072112005);江苏省交通科学研究计划资助项目(05Y50)

摘　　要：基于实桥的缆索钢丝裂纹"先圆后扁"的扩展特征规律,提出了一种实用的拟合几何修正系数,将圆形前锋裂纹与直线形前锋裂纹的公式拟合,评估悬索桥主缆的带裂缝的钢丝断裂强度.该公式简单实用,计算精度令人满意,为缆索钢丝的剩余强度评估提供了快速途径.计算结果表明,断裂韧性方法比净截面理论更适合有裂缝钢丝的失效分析.A practical normalized stress intensity factor is stated in this paper on the basis of the evolution of cracks of cable wires,which fits the crack growth behavior for a semicircular crack and for straight crack.Example testifies that the fracture strength of a cable wire with a surface crack can be assessed conveniently and the result can be acquired with satisfactory precision by this convenient and practical method.And the fracture toughness criterion is more realistic for the fracture strength of the wire.

关 键 词：圆形裂纹 直线形裂纹 净截面理论 断裂韧性 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]