考虑结构空间约束的现浇楼盖梁受剪性能试验研究  

Experimental study on shear performance of cast-in-situ floor beams incorporating structural spatial restraint

作　　者：韩小雷[1,2] 郑振光 梁晓敏 杨坚 林鹏 季静[1,2] 吴梓楠 Han Xiaolei;Zheng Zhenguang;Liang Xiaomin;Yang Jian;Lin Peng;Ji Jing;Wu Zinan(State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China;Guangzhou Pearl River Foreign Investment Architectural Designing Institute Co.,Ltd.,Guangzhou 510060,China)

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640 [2]华南理工大学土木与交通学院,广东广州510641 [3]广州珠江外资建筑设计院有限公司,广东广州510060

出　　处：《土木工程学报》2023年第11期16-26,共11页China Civil Engineering Journal

基　　金：国家自然科学基金(52178483);广州市重点研发计划(202103000038)。

摘　　要：为研究结构空间约束对现浇楼盖梁受剪性能的影响,以剪跨比、面积配箍率、空间位置为变量,在足尺框架结构中开展12根楼盖梁受剪试验,并与对照试件简支梁试验结果进行对比。结果表明:结构空间约束可提高楼盖梁受剪承载力,削弱其变形能力;剪跨比和空间位置显著影响楼盖梁受剪承载力;剪跨比为0.7和1.0时,楼盖梁受剪承载力较简支梁平均提高至1.09和1.39倍;剪跨比0.7时,边框边跨和中框边跨位置的楼盖梁受剪承载力平均提高至1.10和1.25倍;剪跨比1.0时,边框边跨、边框中跨、中框边跨和中框中跨位置的楼盖梁受剪承载力平均提高至1.30、1.30、1.43和1.72倍。根据受剪试验结果修正考虑结构空间约束的楼盖梁受剪破坏数值模拟方法,数值模拟结果表明,楼盖梁在受剪过程中因空间约束产生约束轴力,约束轴力随跨中挠度增大而不断增大。In order to study the effect of structural spatial restraint on the shear performance of cast-in-situ floor beam,tests on shear performance of 12 floor beams in a full-scale frame structure were carried out with shear span ratio,stirrup ratio and spatial position as variables,and the results were compared with the test results of simply supported beams which were designed as control specimens.The results show that:the structural spatial restraint can improve the shear bearing capacity of floor beam and weaken its deformation capacity;The shear span ratio and spatial position significantly affect the shear bearing capacity of floor beam;When the shear span ratio is 0.7 and 1.0 respectively,the shear capacity of floor beams is 1.09 and 1.39 times higher than that of simply supported beams;When the shear span ratio is 0.7,the shear bearing capacity of floor beams in the positions of side frame side span and middle frame side span increases to 1.10 and 1.25 times respectively;When the shear span ratio is 1.0,the shear bearing capacity of floor beams in the position of side frame side span,side frame middle span,middle frame side span,middle frame middle span increases to 1.30,1.30,1.43 and 1.72 times respectively.According to the test results of 12 floor beams,the numerical simulation method for floor beams subject to shear failure incorporating structural spatial restraint is modified.The numerical simulation results show that the spatial restraint will generate restrained axial force of floor beam during loading,and the axial force increases with the increase of mid-span deflection.

关 键 词：结构空间约束 楼盖梁 受剪承载力 轴向伸长 数值分析 

分 类 号：TU375.1[建筑科学—结构工程]