钢丝网片增强混凝土外墙挂板抗弯性能研究  

Study on the Flexural Performance of Steel Mesh Reinforced Concrete Exterior Wallboard

作　　者：李清海 赵娇娇 李清原 高建伟 吴玉姣 周胜男 LI Qing-hai;ZHAO Jiao-jiao;LI Qing-yuan;GAO Jian-wei;WU Yu-jiao;ZHOU Sheng-nan(China Building Materials Academy,Beijing 100024,China)

机构地区：[1]中国建筑材料科学研究总院有限公司,北京100024

出　　处：《混凝土与水泥制品》2020年第11期66-70,共5页China Concrete and Cement Products

基　　金：国家重点研发计划项目(2018YFD1101000)。

摘　　要：采用不同配筋率(0~1.20%)钢丝网片对混凝土外墙挂板进行增强增韧,通过四点弯曲强度-挠度曲线,结合混凝土试件开裂过程的试验现象,分析了配筋率对混凝土外墙挂板在弯曲荷载作用下不同阶段强度、挠度的影响规律。结果表明,试件的比例极限强度、破坏强度及其对应挠度均随配筋率的增加呈线性增加趋势,配筋率增至1.20%时,试件比例极限强度、破坏强度分别比空白试件提高了5.33倍、3.53倍,同时试件的比例极限挠度和破坏挠度分别提高了3.77倍和3.57倍。配筋率对试件非线性变形阶段的作用效果较准弹性阶段更为显著。通过对不同阶段强度及其对应挠度与配筋率的拟合分析,得出强度、挠度与配筋率的数学关系,为混凝土外墙挂板的高性能结构设计提供依据。The steel mesh was used to strengthen and toughen concrete exterior wallboard with different reinforcement ratio(0~1.20%).Based on the strength-deflection curve of four point bending and the experimental phenomenon of concrete cracking process,the influence of reinforcement ratio on the strength and deflection of concrete exterior wallboard at different stages was analyzed.The results show that the proportional ultimate strength and failure strength with the corresponding deflection of the specimens increase with the increase of reinforcement ratio.When the reinforcement ratio increases to 1.20%,the proportional ultimate strength and failure strength of the specimens are 5.33 times and 3.53 times higher than those of the specimens without steel mesh respectively,and the proportional ultimate deflection and failure deflection of the specimens are 3.77 times and 3.57 times higher respectively.The effect of reinforcement ratio on the nonlinear deformation stage is more significant than that of quasi elastic stage.Through the fitting analysis of strength and corresponding deflection with reinforcement ratio at different stages,the mathematical relationship can be obtained between the strength and deflection with the reinforcement ratio,which provides the basis for the high-performance structural design of concrete exterior wallboard.

关 键 词：钢丝网片 配筋率 混凝土外墙挂板 弯曲强度 挠度 

分 类 号：TU528[建筑科学—建筑技术科学]