轻质超高性能混凝土梁抗剪性能试验研究  

Experimental Study on Shear Performance of Lightweight Ultra-high Performance Concrete Beam

作　　者：卢志芳[1] 童路平 刘沐宇[1] 张强[2] 王军 LU Zhi-fang;TONG Lu-ping;LIU Mu-yu;ZHANG Qiang;WANG Jun(Hubei Key Lab oratory of Roadway Bridge&Structure Engineering,Wuhan University of Technology,Wuhan 430070,China;China Railway Major Bridge Reconnaissance&Design Institute Group Co,Ltd,Wuhan 430050,China;China Railway 16th Bureau Group First Engineering Co,Ltd,Beijing 101300,China)

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070 [2]中铁大桥勘测设计院集团有限公司,武汉430050 [3]中铁十六局集团第一工程公司,北京101300

出　　处：《武汉理工大学学报》2021年第11期50-56,共7页Journal of Wuhan University of Technology

基　　金：湖北省重点研发计划(2020BAB081、2020BCB065)。

摘　　要：针对轻质超高性能混凝土(LUHPC)梁的抗剪性能问题,考虑不同剪跨比和配箍率,设计制作了7片LUHPC梁和5片高性能混凝土梁,研究了剪切荷载作用下LUHPC梁的开裂荷载、极限荷载、挠度、箍筋应变和混凝土应变的变化规律,明确了不同剪跨比LUHPC梁的破坏形态,提出了考虑剪跨比、配箍率和混凝土强度等因素的LUHPC梁抗剪承载力计算公式。结果表明:随着剪跨比(1.52~2.54)的增大,LUHPC梁抗剪承载力减小;随着配箍率(0.17%~0.75%)的增大,LUHPC梁抗剪承载力增大;LUHPC梁发生斜压破坏和剪压破坏两种破坏形态,比高性能混凝土梁具有更好的延性;LUHPC梁抗剪承载力公式计算值与试验值吻合良好,平均误差小于5%。研究结果可为LUHPC梁的抗剪设计提供了计算依据。Seven light weight ultra-high performance concrete(LUHPC)beams and five high performance concrete beams were tested to analyze the shear performance of LUHPC beams.The influence of shear span ratio and stirrup ratio was considered.The regulation of cracking load,ultimate load,deflection,stirrup strain and concrete strain of LUHPC beam under shear load were studied experimentally.The failure modes of different shear span ratio LUHPC beams were observed.The calculation formula of shear capacity of LUHPC beam considering shear span ratio,stirrup ratio and concrete strength was proposed.The results show that the shear bearing capacity of LUHPC beam decreases with the increase of shear span ratio(1.52~2.54).With the increase of stirrup ratio(0.17%~0.75%),the shear capacity of LUHPC beam increases.There are two failure modes of LUHPC beam:diagonal compression failure and shear compression failure.LUHPC beams have better ductility than HPC beams.The calculated value of LUHPC beam shear capacity is in good agreement with the test value,and the average error is less than 5%.The results provide a basis for the shear design of LUHPC beam.

关 键 词：轻质超高性能混凝土 剪跨比 配箍率 抗剪承载力 

分 类 号：F403.3[经济管理—产业经济]