不同剪跨比下高强混凝土无腹筋梁剪力传递系数研究  

RESEARCH ON SHEAR TRANSFER COEFFICIENT OF HIGH STRENGTH CONCRETE BEAMS WITHOUT WEB REINFORCEMENT UNDER DIFFERENT SHEAR-SPAN RATIOS

作　　者：吴鹏飞 王德才[2] 黄俊旗[3] 叶献国[1] WU Pengfei;WANG Decai;HUANG Junqi;YE Xianguol(School of Civil Engineering,Hefei University of Technology,Hefei 230009,China;College of Architecture ＆ Art,Hefei University of Technology,Hefei 230009,China;Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hong Kong 999077,China)

机构地区：[1]合肥工业大学土木与水利工程学院,合肥230009 [2]合肥工业大学建筑与艺术学院,合肥230009 [3]香港理工大学土木与环境工程系,香港999077

出　　处：《工业建筑》2018年第8期73-79,共7页Industrial Construction

基　　金：国家自然科学基金项目(51278519);安徽省自然科学基金项目(1708085QE103)

摘　　要：剪力传递系数对高强混凝土无腹筋梁受剪性能数值模拟分析结果有重要影响。通过3根不同剪跨比高强混凝土无腹筋梁的受剪试验,进行基于弥散裂缝的数值模拟分析并考察剪力传递系数取值对分析结果的影响。继而基于65根高强混凝土无腹筋梁单调静力试验结果,进行试件受力全过程的数值模拟分析。以试件抗剪承载力作为匹配最佳剪力传递系数的指标,研究剪跨比（1~4）与最佳剪力传递系数的关系并得出回归公式。分析结果表明：所建立的有限元模型可以较好地模拟高强混凝土无腹筋梁的受力过程和剪切破坏形态;采用弥散裂缝模型,最佳剪力传递系数与剪跨比有关,且随着剪跨比的增大而减小;利用所提公式计算的剪力传递系数进行数值分析得到的结果误差较小,表明该公式可为高强混凝土无腹筋梁抗剪承载力的数值模拟分析提供剪力传递系数取值建议。Shear transfer coefficient can greatly affect the results of numerical simulation on shear behavior of high strength concrete beams without web reinforcement. Through shear tests of three high strength concrete beams without web reinforcement with different shear-span ratios,the finite element analysis was conducted by using smeared crack model,and the influence of crack shear transfer coefficient on the numerical results was evaluated. Then based on the monotonic loading test of 65 high strength concrete beams,the finite element analysis was conducted. By taking the shear bearing capacity of specimen as the best index of shear transfer coefficient,the relationship between crack shear transfer coefficient and shear span-ratio（1 ~ 4） was studied and the statistical model of the relationship was proposed. The failure mode,load-deflection relationship curve obtained by the numerical analysis agreed well with the test results,indicating that the finite element model was capable of simulating the shear behavior of such kind of components. Furthermore,the analysis results showed that shear transfer coefficient decreased with the increase of shear-span ratio,and the error of numerical analysis results was small by adopting the shear transfer coefficient calculated from the proposed regression equation,which could provide suggestion in numerical simulation on shearbearing capacity of high strength concrete beams without web reinforcement.

关 键 词：剪力传递系数 弥散裂缝模型 高强混凝土 无腹筋梁 剪跨比 

分 类 号：TU37[建筑科学—结构工程]