配置钢筋桁架的钢筋混凝土叠合板的剪弯性能研究  

RESEARCH ON SHEAR AND BENDING PROPERTIES OF COMPOSITE REINFORCED CONCRETE SLABS WITH REINFORCED TRUSSES

作　　者：皮正波 魏奇科 兰涌森 罗伟 张浩 王姝琪 PI Zhengbo;WEI Qike;LAN Yongsen;LUO Wei;ZHANG Hao;WANG Shuqi(School of Civil Engineering,Chongqing University,Chongqing 400045,China;China Metallurgical Construction Group Co.,Ltd.,Chongqing 400080,China;CSIC Haizhuang Wind Power Co.,Chongqing 401122,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]中冶建工集团有限公司,重庆400080 [3]中国船舶重工集团海装风电股份有限公司,重庆401122

出　　处：《工业建筑》2020年第6期51-57,共7页Industrial Construction

基　　金：重庆市社会事业与民生保障科技创新专项(cstc2017shmsA30028)。

摘　　要：为研究小剪跨比荷载下配置钢筋桁架的钢筋混凝土叠合墙板的剪弯性能,以叠合板层数和钢筋桁架榀数为参数,在剪跨比λ为2.3时,对1块配置3榀钢筋桁架的双层叠合板和1块配置4榀钢筋桁架的三层叠合板开展四点剪弯试验,得到了2种叠合板的剪弯试验现象和破坏形态、弯矩-加载点挠度关系、受弯承载力特征值和剪弯破坏的力学模型,并根据叠合界面混凝土受剪强度分析推导叠合板的受剪和受弯承载力计算式。研究结果表明:小剪跨比荷载下叠合板的剪弯破坏模式取决于叠合板界面混凝土的桁架数量、叠合板叠合界面的设置位置和方式;三层叠合且配置4榀钢筋桁架的叠合板的极限受剪和受弯承载力比采用双层叠合且配置3榀钢筋桁架的叠合板提高了20.0%,而峰值挠度降低了20.7%,具有更好的受剪和受弯性能;提出了按叠合界面受剪破坏条件推导的叠合板的极限受剪(受弯)承载力计算式,其计算值与试验值吻合较好。To study the shear and bending properties of the composite reinforced concrete slabs with reinforcement trusses under concentrated forces of small shear-span ratios,shear and bending tests on one composite reinforced concrete double-layer slab with three reinforcement trusses and one composite reinforced concrete slabs with four reinforcement trusses under two concentrated forces of shear-span ratio of 2.3 were conducted.The shear and bending failure phenomenon and mode,the relationship between bending moments and loading point deflection,the characteristic values of bending moments and mechanics model of cross-sections of composite reinforced concrete slabs under shear and bending moments were obtained.According to the shear strength of interface concrete of composite slabs,the formulas of shear and flexural capacity of composite slabs were deduced.The results showed that the failure mode of composite reinforced concrete slabs under concentrated loads of small shear-span ratio was up to the quantities of steel bar trusses in the interface of composite slabs,setting modes and setting positions.The ultimate shear or flexural capacity and the largest deflection of the composite reinforced concrete slab with four reinforced trusses respectively increased by 20.0%and decreased by 20.7%compared with that with three reinforced trusses,that was,the slab with four trusses was of better shear and flexural performance.The formula of ultimate shear and flexural capacity of composite reinforced concrete slabs were deduced based on the shear failure condition of composite slab interfaces,the calculated values were in good agreement with the test values.

关 键 词：钢筋混凝土叠合板 小剪跨比 受弯性能 受剪性能 弯矩-挠度关系 钢筋桁架 

分 类 号：TU375.2[建筑科学—结构工程]