摘要
采用ABAQUS分别对托梁有无防火保护的双跨框支墙梁砌体结构的底框进行了受火数值分析,对二者的温度场、耐火极限、托梁变形、转换柱内力和托梁端部受弯载荷比进行研究。结果表明:框支托梁是框支墙梁转换层耐火极限的关键构件;框支托梁达到承载力的耐火极限时,两跨框支托梁的挠度与跨度比相等;托梁进行防火板保护后,转换层转换柱底部反向弯矩增幅较大,转换柱配筋较小时,需对其进行受弯承载力验算;随着梁端受弯载荷比的增加,框支墙梁砌体结构的两种耐火极限急剧减小,墙梁顶面荷载的大小是其耐火极限的重要影响因素之一。
The software ABAQUS is used to numerical analyze the fire resista nee of double-spa n frame-supported wall-beam maso nry structure with and without fire protection. The temperature, fire resistance limit, beam deformation, column's internal force and beam end bending bearing capacity ratio are investigated. Results obtained from ihis study are as follows: Frame-supported beam is the key componerd of fire resistance limit. When lhe frame supported bcamachieves the fire resistance limit of bearing capacity, the deflection of lhe two spans is equal to the span ratio.After the bracket is protected by fire- proof plate, the reverse bending momenl at lhe bottom of the tra nsfer col umn in creases greatly, and when lhe reinforcement of the transfer column is small, it is necessary to check lhe flexural bearing capacity of the transfer column. With the increase of the bending load ratio at the end of the beam, the two fire resista nee limits of frame-supported wall-beam n iason~ ry structure decrease sharply, and the magnitude of lhe top load of the wall-beam is one of the important factors affecting the fire resistance limits.
作者
白连平
邱仓虎
王力
张耕源
王永锋
BAI Lian-ping;QIU Cang-hu;WANG Li;ZHANG Geng-yuan;WANG Yong-feng(Northwest branch,China Academy of Building Research,Shaanxi Xi'an 710061, China;Institute of Building Fire Research ,China Academy of Building Research, Beijing 100013,China)
出处
《消防科学与技术》
CAS
北大核心
2019年第2期233-235,239,共4页
Fire Science and Technology
基金
中国建筑科学研究院自筹基金科研项目(20150111330730047)
国家重点研发计划项目(2017YFC0803300)
关键词
防火板
耐火极限
框支墙梁
载荷比
fireproof board
fire resistance limit
frame-supportedwall-beam
load ratio
