王钧　王志彬　李论

摘要：为研究配有钢纤维活性粉末混凝土（RPC）免拆柱模的钢筋混凝土短柱的轴压力学性能与钢纤维RPC免拆柱模对核心钢筋混凝土短柱轴压承载力的提高效果，对2根配有不同壁厚钢纤维RPC免拆柱模的钢筋混凝土方形短柱和用于对比的1根普通钢筋混凝土方形短柱进行了轴压试验研究；采用有限元模型对试验结果进行了验证，根据试验结果及有限元分析结果，探讨了配有钢纤维RPC免拆柱模的钢筋混凝土短柱轴压承载力计算方法。结果表明：钢纤维RPC免拆柱模显著提高了钢筋混凝土短柱的极限承载力，且延缓了纵筋的屈服；随免拆柱模壁厚的增加，钢筋混凝土短柱轴向变形随之减小，极限承载力随之提高，延性也相对提高；免拆柱模不但限制了钢筋混凝土短柱在轴向压力作用下的侧向变形，而且间接减小了轴向变形；有限元计算结果与试验结果吻合良好，该计算方法可为工程实践提供参考。

关键词：钢纤维RPC；免拆柱模；短柱；静力试验；有限元分析；轴压承载力

中图分类号：TU375.3文献标志码：A

Abstract： In order to investigate the mechanical behavior of reinforced concrete short columns with steel fiber reactive powder concrete （RPC） columnpermanent template and the improvement effect of steel fiber RPC columnpermanent template on bearing capacity of core reinforced concrete short column， axial compression tests on two square reinforced concrete short columns with steel fiber RPC columnpermanent template of different wall thickness and a general square reinforced concrete short column used for comparison were carried out. The test results were verified using finite element model. According to the test and finite element analysis results， the axial bearing capacity calculation method of reinforced concrete short columns with steel fiber RPC columnpermanent template was discussed. The results show that ultimate bearing capacity of reinforced concrete short columns is significantly improved by steel fiber RPC columnpermanent template， and the yield of longitudinal reinforcement is delayed. With the increase of columnpermanent template thickness， axial deformation of reinforced concrete short column decreases， and the ultimate bearing capacity and ductility relatively increase. The lateral deformation of reinforced concrete short columns under axial compression is limited and axial deformation is decreased indirectly by columnpermanent template. The finite element analysis results agree well with the test results. The calculation method can provide references for practical engineering.

Key words： steel fiber RPC； columnpermanent template； short column； static test； finite element analysis； axial bearing capacity

0引言

模板工程是钢筋混凝土工程施工的基本组成部分。传统模板及其支撑系统的设计、安装、拆除以及周转等工作极其繁复，使其经济比重约占钢筋混凝土工程的四分之一，工期约占钢筋混凝土工程的二分之一[12]。因此，有效改进模板技术将大力推进建筑技术的进步，目前已经成为各国学者亟待解决的一项研究课题。

施一雷等[3]进行的相关研究表明，将钢丝网、玻璃纤维等增强材料与高强水泥砂浆或混凝土进行复合制作而成的免拆模板在实际工程中的应用是可行的。……