带板钢筋混凝土简支梁的耐火极限增大系数  

Fire-Resistance-Enhancement-Coefficient of Reinforced Concrete Simply-Supported Beams with Slab

作　　者：唐贵和[1,2] 吴波[1] 

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广州510640 [2]华南农业大学土木系,广州510642

出　　处：《防灾减灾工程学报》2012年第6期693-699,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金重点项目(50738005);亚热带建筑科学国家重点实验室重点研究项目(2008ZA10)资助

摘　　要：利用SAFIR程序,对带板钢筋混凝土简支梁的耐火极限增大系数进行了分析。考察了梁的荷载比、配筋率、保护层厚度、跨高比,以及板的厚度、宽度、保护层厚度和配筋率等参数,对ISO834标准升温过程作用下带板简支梁的耐火极限增大系数的影响规律。通过1296种工况的计算分析,建立了该增大系数的实用计算公式。研究结果表明:①板的保护层厚度对该增大系数的影响较大,随着保护层厚度增加,该增大系数迅速增大;②板的厚度和纵筋配筋率对该增大系数的影响较小;③适当增加板的宽度可以提高该增大系数。Using the computer program of SAFIR,the influences of some parameters（i.e.,load ratio,reinforcement ratio,thickness of concrete cover and span-to-height ratio of RC beam,and height,width,thickness of concrete cover and reinforcement ratio of RC slab） on the fire-resistance-enhancement-coefficient（FREC） of RC simply-supported beams with slab exposed to ISO834 standard fire are analyzed.Based on the simulation results of 1296 cases,a practical calculation method for the FREC is proposed.Simulation results show that：（a） the thickness of concrete cover of slab affects the FREC significantly,and the FREC increases quickly with the increasing of the thickness of concrete cover;（b） the thickness and longitudinal reinforcement ratio of slab have little effect on the FREC;and（c） the FREC increases with the increasing of the width of slab to a certain extent.

关 键 词：钢筋混凝土 梁 板 耐火极限 增大系数 

分 类 号：TU375[建筑科学—结构工程]