不同钢纤维含量RPC材料受压力学性能研究  

Study on Mechanical Performance of Reactive Powder Concrete with Different Steel Fiber Contents under Uniaxial Compression

作　　者：安明喆[1] 宋子辉[1] 李宇[1] 张宇[2] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]天津城建设计院有限公司,天津300073

出　　处：《中国铁道科学》2009年第5期34-38,共5页China Railway Science

基　　金：国家自然科学基金资助项目(50508005);国家"八六三"计划项目(2006AA03Z537)

摘　　要：通过单轴受压强度试验和变形特性试验,研究不同钢纤维体积含量活性粉末混凝土的基本力学性能与本构关系。研究结果表明：纤维体积含量在1.50%-1.75%之间变化时,活性粉末混凝土的轴心抗压强度和峰值应变无明显变化,当纤维体积含量超过1.75%后,轴心抗压强度和峰值应变明显提高;活性粉末混凝土的受压破坏过程包括裂缝稳定扩展、裂缝失稳扩展、多条裂缝贯通和纤维粘脱4个阶段。结合试验曲线,推导出不同钢纤维体积含量活性粉末混凝土统一的单轴受压本构方程。Based on experiments for strength and deformation of reactive powder concrete（RPC） under uniaxial compression,the constitutive relationship and mechanical performance of RPC with different steel fiber contents were studied.The results show that the axial compressive strength and the peak strain of RPC have no obvious change if the steel fiber content varies from 1.5% to 1.75%.And they will increase obviously if the steel fiber content is more than 1.75%.The compressive failure of RPC have four phases,they are stages of crack enlarging steadily, crack enlarging unsteadily, cracks running-through and fiber diviating. According to experiment curves, an equation for the constitutive relationship of RPC is deduced with different steel fiber contents under uniaxial compression.

关 键 词：活性粉末混凝土 单轴受压 体积含量 力学性能 应力—应变全曲线 本构方程 

分 类 号：U214.18[交通运输工程—道路与铁道工程] TU528.572[建筑科学—建筑技术科学]