建筑结构学报2013，Vol.34Issue(8)：20-29,10.
高温后钢筋混凝土梁剩余承载性能试验研究
Experimental study on residual performance of reinforced concrete beams after fire
摘要
Abstract
Based on the static load tests of seven reinforced concrete (RC) beams after fire and three contrastive specimens at ambient temperature,the effects of fire exposure time,shear span ratio,reinforcement ratio and flange on the residual shear behavior and the residual flexural behavior of beams were analyzed.Using a finite element program,the effects of ISO 834 standard fire with rising and cooling phases on the peak temperature in the RC section were analyzed and a practical calculation method for the shear strength of RC beams after fire was suggested.The results show that the fire can decrease the bending capacity and shear capacity,and increase the deflection of RC beam on the whole.The flange has a positive influence on the improvement of residual flexural capacity but has little effect on the shear capacity of RC beam after fire.The cooling phase of fire has significant effects on the peak temperature in the section,and whether it is considered can lead to a peak temperature with the biggest difference of 283 ℃ and 251 ℃ in a section of 250 mm width and 400 mm height after exposure to ISO 834 standard fire for 1 h and 2 h,respectively.The proposed formula for the residual shear capacity of RC beams after fire has certain safety margin ratio,and can be used to assess the shear performance of structural member after fire.关键词
钢筋混凝土梁/火灾后/静力试验/承载性能/受剪承载力Key words
reinforced concrete beams/ post-fire/ static test/ bearing performance/ shear capacity分类
建筑与水利引用本文复制引用
徐玉野,吴波,王荣辉,江茗,罗漪..高温后钢筋混凝土梁剩余承载性能试验研究[J].建筑结构学报,2013,34(8):20-29,10.基金项目
国家自然科学基金项目(50908091),国家重点基础研究发展计划(973计划)项目(2011CB013800),福建省高等学校新世纪优秀人才支持计划项目(11FJRC03),泉州市技术研究与开发重点项目(2011Z10,2011Z12). （50908091）
