火灾环境下变截面杆的临界荷载和临界长度  

Critical load and length of variable cross section rods under fire conditions

作　　者：孙强[1] 陆守香[2] 

机构地区：[1]安徽建筑工业学院土木工程系,安徽合肥230022 [2]中国科学技术大学火灾科学国家重点实验室,安徽合肥230027

出　　处：《中国科学技术大学学报》2006年第6期668-673,共6页JUSTC

基　　金：国家重点基础研究专项经费(2001CB409600);安徽省教育厅自然科学基金(2004kj099);安徽省优秀青年科技基金(04044057)资助

摘　　要：根据弹性稳定理论研究了变截面杆在火灾环境下的静力特性问题,导出了火灾条件下变截面杆件的静力稳定临界荷载和临界长度计算式,讨论了温度、长细比、杆件截面形式、材料特性等因素对杆件稳定临界荷载和临界长度的影响.研究表明,温度、长细比、杆件截面形式、保护层厚度对杆件稳定临界荷载和临界长度影响较大,构件自重的影响可忽略,在此基础上给出了不同约束条件下杆件的计算参数.The problems of static force characteristic of variable cross section rods under fire state were studied by elasticity stability theory. The calculating formulas for critical loads and length for variable cross section rods under fire conditions were conducted. And the effects of temperature, slenderness ratio, section forms of rods and material characteristic on stability behavior were discussed. Research shows that temperature, slenderness ratio, section forms of rods, and covering layer thickness to members under fire conditions have a sizable effect on critical load and length of rods, but the effect of rod dead load may be overlooked. Based on the conclusion, the calculation parameters with different restrictions of rods were presented.

关 键 词：变截面杆件 高温环境 静力特性 临界荷载和长度 弹性稳定理论 

分 类 号：TU311[建筑科学—结构工程]