火灾后混凝土连续构件的损伤与加固试验研究  

Experimental Study on Damage and Rehabilitation of Reimforced Concrete Continuous Member After Fire

作　　者：余江滔[1] 刘媛[1] 陆洲导[1] 项凯 

机构地区：[1]同济大学结构工程与防灾研究所,上海200092 [2]天津消防研究所,天津300000

出　　处：《同济大学学报（自然科学版）》2012年第4期508-514,共7页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金(51008235);国家重点实验室基金(LDRCE 09-D-02);教育部高等学校博士学科点专项科研基金(200802471089)

摘　　要：为了研究受火后混凝土连续受弯构件的力学性能,进行了5个混凝土两跨连续板和7个两跨连续梁的系列试验.试验内容包括依据ISO 834标准升温曲线进行的混凝土连续构件受火试验,以及高温后受损构件和修复加固构件的静载试验.试验结果表明,高温对混凝土连续受弯构件的力学性能有明显的影响;随着受火程度的加重,混凝土构件力学性能呈下降趋势.分析试验结果可知,初始刚度降幅最为明显,正常使用承载力的降幅大于极限承载力的降幅;连续板试件的损伤大于连续梁试件.通过置换受损混凝土并采用碳纤维布加固受火后连续构件可使其承载力恢复到甚至超过受火前的状态,加固后初始刚度的提高并不明显.To study the mechanical performance of reinforced concrete continuous bending members after fire, a series of tests were carried out on 5 reinforced concrete （RC） continuous slabs and 7 RC continuous beams, which included fire test on continuous members with the calefaction way of ISO 834 and static test at ambient temperature on the fire damaged members and strengthened after fired members. The results demonstrate that high temperature has an obvious effect on mechanical properties of continuous bending members and along with an aggravated fire level, the mechanical properties show a decreasing trend. Based on the experimental data, the initial bending rigidity has the greatestreduction, the serviceability bearing capacity drops more than ultimate bearing capacity and the fire damage of continuous slabs is severe than that of continuous beams. Damaged concrete replacement and reinforcement with carbon fibre reinforced plastics （CFRP）sheet can offset the loss of bearing capacity and even make it better than unfired state but has little effect on increasing the initial rigidity. Key words： fire; concrete; continuous bending member; mechanical performance; carbonfibre reinforced plastics reinforcement

关 键 词：火灾 混凝土 连续受弯构件 力学性能 碳纤维加固 

分 类 号：TU375[建筑科学—结构工程]