火灾下预应力混凝土梁板非线性分析  

Nonlinear analysis of prestressed concrete beams and slabs subjected to fires

作　　者：许名鑫[1] 郑文忠[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《哈尔滨工业大学学报》2006年第4期558-562,共5页Journal of Harbin Institute of Technology

基　　金：黑龙江省杰出青年科学基金资助项目(2001)

摘　　要：常温下预应力混凝土结构中的预应力筋处于高应力状态.若因高温作用使预应力筋的预应力水平发生锐减,将给预应力混凝土工程带来灾难性的后果.因此,本文就应用ANSYS软件对火灾下预应力混凝土梁板非线性分析进行了尝试.在提出了常温下预应力混凝土受弯构件在有效荷载作用下的安全系数的概念,并推导出其数学表达式之后,通过大量的计算分析,得出了板中预应力筋抗火混凝土保护层厚度建议取值和梁中预应力筋梁侧抗火混凝土保护层厚度建议取值,为进行预应力混凝土结构抗火设计提供了参考依据.Tendons of prestressed concrete structure is in high stress state at normal temperature. If high temperature makes the prestressing reduce drastically, catastrophic sequel will occur on prestressed concrete engineering. So the paper attempts to analyze the nonlinear properties of prestressed concrete beams and slabs subjected to fires by ANSYS software. With the conception of safety coefficient of prestressed concrete flexural members presented and its mathematic expression deduced as well as lots of calculation completed, the covers＇ thicknesses of the concrete for fire resistance are recommended. It can be used as reference for design of prestressed concrete structures for fire resistance.

关 键 词：火灾 预应力 混凝土 非线性分析 保护层厚度 

分 类 号：TU378.1[建筑科学—结构工程]