超高性能混凝土梁受剪性能的尺寸效应试验研究  

Size Effect on Shear Behavior of Ultra-high Performance Concrete Beams

作　　者：曹霞[1] 全勇鹏 杨振轩 金奇志[1] 郑艳[1] CAO Xia;QUAN Yongpeng;YANG Zhenxuan;JIN Qizhi;ZHENG Yan(Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin University of Technology,Guilin 541004,China;Guangzhou Zhujiang Foreign Investment Building Design Institute Co.Ltd,Guangzhou 510030,China)

机构地区：[1]桂林理工大学广西建筑新能源与节能重点实验室,广西桂林541004 [2]广州珠江外资建筑设计院有限公司,广州510030

出　　处：《太原理工大学学报》2023年第3期500-508,共9页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(52068012);广西高校中青年教师科研基础能力提升项目(2019KY0267);广西自然科学基金资助项目(2021JJA160035)。

摘　　要：为研究超高性能混凝土梁受剪性能的尺寸效应,对不同截面尺寸HRB500级钢筋超高性能混凝土梁进行受剪试验。首先分析UHPC梁的试验现象及结果,其次探究截面尺寸对梁剪切延性、剪切裂缝强度及抗剪强度的影响规律,最后基于所得试验数据比较现行公式的适用性。结果表明:不同截面尺寸梁的失效模式均为剪压破坏,梁的应力重分布能力、挠度、刚度及主裂缝特征参数均与截面尺寸呈正相关;梁的位移延性系数、剪切裂缝强度及抗剪强度均随梁高的增大而减小,存在明显的尺寸效应;经对比分析,陈宝春提出的抗剪承载力公式的预测值较好。HRB500 steel reinforced ultra-high performance concrete beams with different section sizes were tested to study size effect on shear performance.The experimental phenomena and results of ultra-high performance concrete beams were analyzed.The size effect on ductility,shear crack strength,and shear strength of beams was investigated.Besides,the applicability of the current specification formulas was compared on the basis of the obtained test data.The results show that the failure modes of beams with different cross-sectional size were all shear-compression failure.The stress redistribution capacity,deflection,stiffness,and main shear crack characteristic parameters of the beams were positively correlated with the section size.Furthermore,the displacement ductility coefficient,shear crack strength,and shear strength of beams decreased with the increase of cross-sectional dimensions,and there was an obvious size effect.Through comparison and analysis,the predicted values of the shear bearing capacity formula proposed by Chen Baochun were better.

关 键 词：HRB500 超高性能混凝土 梁 受剪性能 尺寸效应 

分 类 号：TU375.1[建筑科学—结构工程]