摘要
为改善目前装配式叠合梁常存在后浇区易开裂、构件延性较差、易损伤等缺点,将工程水泥基复合材料(ECC)应用于叠合梁的底板及后浇区,进行了11个梁试件的纯受弯试验.研究该种试件受弯性能及ECC板厚度、钢筋连接方式、配筋率等因素对其受弯性能的影响;分析其特征点的承载力与位移,测量试件的裂缝宽度及其发展趋势并分析损伤演化规律.结果表明:带有ECC底板和后浇拼缝的装配式梁比普通混凝土梁开裂、屈服、极限状态下的荷载及位移及试件延性均有提高,且ECC底板越厚,提高作用越显著;采用套筒或环箍-插筋的方式均可有效传递钢筋应力;采用带ECC底板的装配式梁可有效控制纯受弯区裂缝宽度,且其破坏时损伤指数更大.其在损伤严重时仍可承受荷载,适合应用于装配式结构的关键节点.
In order to overcome the shortcomings of precast composite beams,such as easy cracking in post-cast zone,poor ductility,and easy to damage,engineering cementitious composites(ECC)were used in the precast plate and post-cast area of composite beams.Bending tests were carried out on 11 beam specimens.The flexural properties and effects of the ECC plate thickness,connecting method of reinforcement,and reinforcement ratio on the flexural properties were investigated.Bearing capacity and displacement of its characteristic point were studied.The crack width was measured and the laws of crack development trend and damage evolution were analyzed.The results show that the load,displacement,and ductility of the precast beams with ECC plate and post-cast joints under cracking,yielding,and ultimate condition were higher than those of RC beams.The thicker the ECC plate was,the more significant the effect was.The reinforcement connection methods of steel sleeve and hoop-inserting could effectively transfer the reinforcement stress.The precast beam could effectively control the crack width in bending area,and the damage index was larger when it was damaged.However,it could still bear load when the damage was serious,which is suitable for the key joint of precast structure.
作者
崔涛
何浩祥
闫维明
钱增志
周大兴
CUI Tao;HE Haoxiang;YAN Weiming;QIAN Zengzhi;ZHOU Daxing(Beijing Key Lab of Earthquake Engineering and Structure Retrofit(Beijing University of Technology),Beijing 100124,China;China Railway Construction Group Co.Ltd.,Beijing 100040,China)
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2019年第12期104-112,共9页
Journal of Harbin Institute of Technology
基金
国家重点研发计划(2017YFC1500600)
中铁建设集团有限公司科技发展计划(LX16-07)
