钢丝网架混凝土夹芯墙板轴心受压承载力分析

摘要

Concrete sandwich panels with steel wire mesh are widely used in multi-storey residential buildings and office buildings with the advantages of low self-weight,high strength as well as convenient construction.To better understand the structural behavior and ensure application safety, three typical methods recommended by different codes for strength prediction of panels subjected to axial compressive loading have been presented with the assumption of full composite section character. The analysis results which have been compared with the existing experimental results show that the parameter of slenderness ratio has great effect on the compressive behavior of concrete sandwich panel and all the three methods are not expected to be applicable any more in the cases that slenderness ratio is more than 25 for the sake of poor structural safety.The ratio of predicted ultimate strength obtained from recommended formula of domestic codes to the peak load in experimental analysis ranges from 0.75 to 1.3 which means that the strength is much overestimated with big divergence and these methods couldn’t be applied to strength analysis for the sake of structural safety.While the strength arising from ACI318 -11 method could reach 70% ~90% the testing value which provides satisfactory result with more reliability and better agreement with testing data for concrete sandwich panel structural design.%钢丝网架混凝土夹芯墙板作为一种轻质、高强、施工便捷的构件已广泛应用于多层住宅和办公楼，研究该类墙板的受力性能可有效确保其结构使用安全。文章选用三种代表性的计算方法对该类墙板的轴压承载力进行了理论分析，并将计算结果与已有的试验数据进行了对比研究。结果表明：高厚比对墙板受压性能影响较大，当墙板高厚比超过25时，现有的理论不再适用于轴压承载力计算；三种计算方法的结果对比可知，采用国家规范 GB 50010—2010和 GB 50003—2011中公式计算所得的极限承载力结果与试验结果的比值在0．75～1．3之间，离散性较大且偏于不安全，不适于钢丝网架墙板的承载力分析；根据 ACI 318—11推荐公式计算所得的极限承载力结果与试验极限荷载的比值在0．7～0．9之间，安全储备较高，可作为该类墙板的结构设计依据。