不同取代率和配筋率对RAC梁受弯性能影响试验研究  

Experimental Study on the Influence of RAC Beam Flexural Performance with Different Replacement and Reinforcement Ratio

作　　者：张明明[1] 刘康宁[1] 蒲靖 王社良[1,2] 白永利 祁磊 ZHANG Ming-ming;LIU Kang-ning;PU Jing;WANG She-liang;BAI Yong-li;QI Lei(School of Civil Engineering,Xijing University,Xi’an 710123,China;School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Gansu Electric Power Economy Technology Research Institute,Lanzhou 730050,China)

机构地区：[1]西京学院土木工程学院,西安710123 [2]西安建筑科技大学土木工程学院,西安710055 [3]国网甘肃省电力公司经济技术研究院,兰州730050

出　　处：《硅酸盐通报》2018年第9期2748-2753,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51178388;51008245);陕西省重点重点实验室科研计划项目(11JS059;12JS055);陕西省科技统筹创新工程计划(2013SZS01-Z02;2013SZS01-K01);陕西省攻关项目(2014K06-34)

摘　　要：为了研究RAC梁在不同取代率和不同配筋率下其正截面受弯破坏形态和受弯性能,采用再生骨料取代率为0%、30%、60%和100%共4种,配筋率为0.433%、1.76%和2.62%共3种,在不同工况下设计并制作了6根RAC梁,试验采用四分点加载方案,对不同取代率和配筋率下正截面受弯RAC梁的开裂荷载、屈服荷载、极限荷载、挠度以及跨中截面应变等进行了试验研究。试验结果表明:RAC梁与普通混凝土梁破坏形态基本相同,均经历弹性、带裂缝工作以及破坏三个阶段;RAC受弯梁正截面符合平截面假定;不同取代率下RAC梁开裂荷载非常接近,但屈服和极限荷载受再生骨料取代率的影响比较明显,其中普通混凝土梁屈服和极限荷载最大,而后随取代率的增加而随之增大;配筋率越大,受弯承载力越大,且开裂荷载随配筋率的增加而略有增加,屈服和极限荷载增幅较大;变形随配筋率的增加而变化幅度相对较低。In order to study the RAC beam in different replacement ratio and different reinforcement ratio under the normal section bending failure modes and bending performance,the replacement rates of recycled aggregate were 0%,30%,60%and 100%,three kinds of reinforcement ratio were 0.433%,1.76%and 2.62%,six RAC beams were designed and fabricated under different working conditions,the four point loading scheme was adopted in the test,the cracking load,yield load,ultimate load,deflection and mid span section strain of normal section RAC beams under different replacement ratios and reinforcement ratios were studied.The experimental results show that the RAC beam and ordinary concrete beam failure mode is basically the same,all experienced three stages of elasticity,crack work and destruction;assumption of normal cross section of RAC subjected to bending beam;different substitution rate of RAC beams is very close,however,the effect of yield and limit load on the replacement rate of recycled aggregate is more obvious,the yield and ultimate load of ordinary concrete beams are maximum,then it increases with the increase of the substitution rate;the greater the reinforcement ratio,the greater the flexural capacity,and the cracking load increases slightly with the increase of reinforcement ratio,the increase of yield and limit load is larger;the variation of the deformation is relatively low with the increase of the reinforcement ratio.

关 键 词：再生骨料取代率 挠度 配筋率 截面应变 受弯性能 

分 类 号：TU375.1[建筑科学—结构工程]