约束混凝土受压力学性能实测及修正本构模型  

Experimental Study on Compressive Behavior of Confined Concrete and Modified Constitutive Model

作　　者：何浩祥[1] 王峥[1] 程时涛 陈旺 高翔[1] HE Haoxiang;WANG Zheng;CHENG Shitao;CHEN Wang;GAO Xiang(Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100024,China)

机构地区：[1]北京工业大学工程抗震与结构诊治北京市重点试验室,北京100124

出　　处：《应用基础与工程科学学报》2024年第4期1170-1185,共16页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(51878017)。

摘　　要：现有的约束混凝土本构模型并非依据直接测试数据构建,需要验证和修正.为了精准量测约束混凝土内部应力,研发微型大量程土压力盒.利用嵌入在树脂杆内的应变计测量混凝土内部应变.将相关传感器预埋在钢筋混凝土棱柱体试件内部不同位置,最终完成轴压试验,获取约束混凝土真实的应力-应变数据.对约束混凝土中不同位置的应力-应变数据进行综合处理,得到等效应力-应变曲线,并据此对传统约束混凝土本构模型进行修正.通过对试件的有限元模拟分析初步验证修正约束混凝土本构模型的准确性.通过钢筋混凝土柱静力加载破坏试验数据及有限元模拟进一步验证修正本构模型和所采用测试技术的精准性.The existing constitutive model of confined concrete is not established on the direct test data,which needs to be verified and modified.In order to accurately measure the internal stress of confined concrete,a miniature large range earth pressure box is developed.The internal strain of concrete is measured by the strain gauges embedded in a resin rod.The relevant sensors are embedded in different positions inside the reinforced concrete prismatic specimens,and finally the axial compression test is carried out to obtain the real stress-strain data of the confined concrete.The stress-strain data at different positions in the confined concrete are comprehensively processed to obtain the equivalent stress-strain curve,and then the traditional constitutive model of confined concrete is modified.Through the finite element simulation analysis of the specimen,the accuracy of the modified constrained concrete constitutive model is preliminarily verified.The accuracy of the modified constitutive model and the test technique is further verified by the static loading failure test data and finite element simulation of reinforced concrete columns.

关 键 词：约束混凝土 应力-应变曲线 本构模型 应力测试 轴压试验 滞回曲线 

分 类 号：TU528[建筑科学—建筑技术科学]