钢纤维掺量对超高性能混凝土轴压力学性能影响研究  

Research on the influence of steel fiber content on the axial compression properties of ultra high performance concrete

作　　者：刘巧会 黄海峰 薛苗苗 秦肖军 LIU Qiaohui;HUANG Haifeng;XUE Miaomiao;QIN Xiaojun(Engineering College,Zhengzhou Technology and Business University,Zhengzhou 451450,China;Chengdu Branch of Sichuan Chengmian Cangba Expressway Company Limited,Chengdu 641400,China;Sichuan Expressway Construction and Development Group Company Limited,Chengdu 610041,China;Shanghai Baoye Group Company Limited,Shanghai 201900,China)

机构地区：[1]郑州工商学院工学院,河南郑州451450 [2]四川成绵苍巴高速公路有限责任公司成都分公司,四川成都641400 [3]四川高速公路建设开发集团有限公司,四川成都610041 [4]上海宝冶集团有限公司,上海201900

出　　处：《辽宁工程技术大学学报（自然科学版）》2024年第4期454-462,共9页Journal of Liaoning Technical University (Natural Science)

基　　金：四川省交通运输科技项目(2022-ZL-02)。

摘　　要：为揭示钢纤维掺量对超高性能混凝土(UHPC)轴压力学性能的影响规律,以钢纤维掺量为控制变量开展UHPC轴压试验并进行本构模拟。研究表明:UHPC受压应力-应变曲线由上升段和下降段组成;掺加钢纤维后,UHPC受压应力-应变曲线的下降段变缓;随着钢纤维掺量的增加,UHPC的受压弹性模量、峰值应力、峰值应变均呈递增趋势;假定UHPC受压损伤区服从Weibull随机分布,构建损伤变量,引入损伤修正因子,建立一种新的考虑钢纤维掺量的UHPC受压损伤模型并分析损伤变量发展规律,利用UHPC轴压试验数据验证新建模型的可靠性。研究成果为不同钢纤维掺量下UHPC轴压力学性能的研究及本构模拟提供参考。To reveal the influence of steel fiber content on the axial compressive properties of ultra-high performance concrete(UHPC),UHPC axial compression tests were conducted with steel fiber content as the control variable and constitutive simulations were conducted.The research show that the stress-strain curve of UHPC under compression consists of an ascending segment and a descending segment.After adding steel fibers,the descending section of the stress-strain curve of UHPC under compression becomes slower.With the increase of steel fiber content,the compressive elastic modulus,peak stress,and peak strain of UHPC all show a decreasing trend.Assuming that the UHPC compression damage area follows a Weibull random distribution,a damage variable is constructed,and a damage correction factor is introduced.A new UHPC compression damage model considering different steel fiber contents is established,and the development law of damage variables is analyzed.The reliability of the new model is verified using UHPC axial compression test data.The research results provide reference for the study of axial compressive properties and constitutive simulation of UHPC under different steel fiber contents.

关 键 词：桥梁工程 超高性能混凝土(UHPC) 钢纤维掺量 轴压 损伤模型 

分 类 号：TU528[建筑科学—建筑技术科学] U445[建筑科学—桥梁与隧道工程]