聚丙烯-钢纤维/混凝土柱大偏心受压承载力计算  

Calculation of bearing capacity of polypropylene-steel fiber reinforced concrete column under large eccentric loading

作　　者：张广泰[1] 曹银龙 李瑞祥 张路杨 陈勇 ZHANG Guangtai;CAO Yinlong;LI Ruixiang;ZHANG Luyang;CHEN Yong(Architectural Engineering Institute,Xinjiang University,Xinjiang 830047,China)

机构地区：[1]新疆大学建筑工程学院,新疆830047

出　　处：《复合材料学报》2020年第9期2336-2347,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51968070)。

摘　　要：对270个聚丙烯纤维掺量(体积分数)分别为0vol%、0.1vol%、0.2vol%、0.3vol%、0.4vol%、0.5vol%、钢纤维掺量(体积分数)分别为0vol%、0.5vol%、1vol%、1.5vol%、2vol%的聚丙烯-钢纤维/混凝土试块进行立方体抗压试验、轴心抗压试验和劈裂抗拉试验,基于复合材料力学理论,考虑纤维的取向系数、长度有效系数和界面黏结系数,对其建立强度预测模型并进行机制分析,同时选取掺量分别为0vol%、0.1vol%、0.3vol%的聚丙烯纤维、掺量分别为0vol%、1.5vol%的钢纤维制作6根聚丙烯-钢纤维/混凝土柱,对其进行大偏心受压试验,在强度预测模型的基础上进行承载力计算,提出聚丙烯-钢纤维/混凝土承载力计算方法。结果表明:钢纤维对聚丙烯-钢纤维/混凝土立方体抗压强度、轴心抗压强度和劈裂抗拉强度均有提高;聚丙烯纤维可提高聚丙烯-钢纤维/混凝土的劈裂抗拉强度,但不能提高聚丙烯-钢纤维/混凝土的抗压强度;聚丙烯-钢混杂纤维加入混凝土柱可有效提高其极限承载力。The cube compressive test,axial compressive test and splitting tensile test were conducted on 270 polypropylene-steel fiber/concrete test blocks with polypropylene fiber content(volume fraction)of 0 vol%,0.1 vol%,0.2 vol%,0.3 vol%,0.4 vol%,0.5 vol%and steel fiber content(volume fraction)of 0 vol%,0.5 vol%,1 vol%,1.5 vol%and 2 vol%respectively.Based on the mechanical theory of polypropylene-steel fiber/concrete composites,the strength prediction model was established considering the fiber orientation coefficient,effective length coefficient and interfacial bond coefficient.The mechanism was also analyzed.Six polypropylene-steel fiber/concrete columns were made from polypropylene fiber with a content of 0 vol%,0.1 vol%,0.3 vol%and steel fiber with a content of 0 vol%,1.5 vol%to perform large eccentric compression test.On the basis of strength prediction model,the bearing capacity of polypropylene-steel fiber/concrete was calculated.The results show that steel fiber can improve the compressive strength,axial compressive strength and splitting tensile strength of polypropylene-steel fiber/concrete.Polypropylene fiber can improve the splitting tensile strength of polypropylene-steel fiber/concrete,but can’t improve the compressive strength.The ultimate bearing capacity of concrete columns can be effectively increased by adding polypropylene-steel fibers.

关 键 词：钢纤维 聚丙烯纤维 混凝土柱 大偏心受压 极限承载力 

分 类 号：TU528.58[建筑科学—建筑技术科学]