超高性能混凝土的单轴力学性能与本构模型研究  

Research on uniaxial mechanical properties and constitutive models of ultra-high performance concrete

作　　者：肖靖林 陈成勇 丁然[1] 徐长靖 王哲 李月祥 樊健生[1] XIAO Jinglin;CHEN Chengyong;DING Ran;XU Changjing;WANG Zhe;LI Yuexiang;FAN Jiansheng(Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Shandong Hi-Speed Infrastructure Construction Co.,Ltd.,Jinan 250014,China)

机构地区：[1]清华大学土木工程系,北京100084 [2]山东高速基础设施建设有限公司,山东济南250014

出　　处：《混凝土》2024年第11期24-33,共10页Concrete

基　　金：国家自然科学基金重大项目(51890903)。

摘　　要：为研究超高性能混凝土(UHPC)的基本力学性能,通过优化的狗骨受拉试验、棱柱体受压试验、立方体受压试验,测得了不同设计参数的UHPC材料的单轴抗拉及抗压性能。试验结果表明,UHPC的抗拉强度和变形能力随钢纤维掺量的增加而提升,钢纤维掺量2.5%的UHPC具有多缝开裂、应变硬化特征。钢纤维掺量由1.5%增加至2.5%,UHPC的抗压强度明显提高;而钢纤维掺量分别为2.5%和3.5%的UHPC抗压强度差异不大。与标准养护的UHPC相比,高温蒸养的UHPC的抗拉强度、抗压强度更高。基于试验结果,提出了UHPC单轴受拉本构的经验式;通过比选已有文献成果及规范,对UHPC单轴受压本构公式给出建议,并标定了未知参数。In order to study the basic mechanical properties of ultra-high performance concrete(UHPC),the uniaxial tensile and compressive properties of UHPC with different design parameters were measured through the optimized dog-bone tensile test,prism compression test and cube compression test.The experimental results show that the tensile strength and deformation capacity of UHPC improve with the increase of steel fiber content.UHPC containing 2.5%steel fiber possesses the characteristics of multiple cracks and strain hardening.When steel fiber content increases from 1.5%to 2.5%,the compressive strength of UHPC improves obviously.However,there is no significant difference in the compressive strength of UHPC with steel fiber content of 2.5%and 3.5%,respectively.Compared with the UHPC cured under standard condition,the tensile strength and compressive strength of the high-temperature steam-cured UHPC are higher.Based on the experimental results,the empirical uniaxial tensile constitutive equationof UHPC was proposed.The suggestions for uniaxial compression constitutive equation of UHPC were the unknown parameters were calibrated and given by comparing the existing literatures and specifications.

关 键 词：超高性能混凝土(UHPC) 轴心受拉性能 轴心受压性能 单轴本构模型 

分 类 号：TU528.31[建筑科学—建筑技术科学]