考虑低温冷脆钢结构构件的实用简化设计方法  

PRACTICAL SIMPLIFIED DESIGN METHOD OF STEEL COMPONENTS UNDER LOW TEMPERATURE CONDITIONS

作　　者：王元清[1] 冯宝锐[1] 石永久[1] 武延民[2] 

机构地区：[1]清华大学土木工程系结构工程与振动教育部重点实验室,北京100084 [2]中冶京诚工程技术公司,北京10053

出　　处：《钢结构》2008年第12期1-5,共5页Steel Construction

基　　金：国家自然科学基金项目(50778102和50078029);铁道部-清华大学科技研究基金项目(T2000410)。

摘　　要：在低温下,结构钢材往往在远未达到屈服应力的情况下发生脆性断裂。通过对结构钢构件裂纹尖端张开位移(CTOD)的研究,提出基于CTOD指标的低温下考虑冷脆效应的钢结构构件简化设计方法。该方法属于分级设计方法,以考虑裂纹扩展而提高部分的最大承载能力作为构件的承载力,并研究构件温度和厚度对结构钢材断裂韧性的影响,计算得到各种温度和厚度情况下的强度折减系数,最后给出利用此简化设计方法计算的设计算例。The brittle fracture always occurs under low temperature when the stress thereof is much lower than yield stress. Crack tip opening displacement （CTOD） of structural steel members has been studied, and a simplified practical design method which is taking into account of low temperature fracture effect has been proposed. This approach belongs to grading method, and takes the max loading resistance including the increase after the crack extension. The influences of temperature and thickness on fracture toughness are then researched, and corresponding strength reduction coefficients are calculated under different conditions. Finally, some design examples are given employing this method.

关 键 词：结构钢材 低温 脆性断裂 设计方法 

分 类 号：TU391[建筑科学—结构工程]