混凝土内部受压力学性能试验与本构分析  

Mechanical Test and Constitutive Analysis of Internal Compression of Concrete

作　　者：何浩祥[1] 王峥 程时涛 高伟 HE Haoxiang;WANG Zheng;CHENG Shitao;GAO Wei(Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit,Beijing University of Technology Beijing,100124,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实验室,北京100124

出　　处：《振动．测试与诊断》2024年第1期135-141,202,共8页Journal of Vibration,Measurement & Diagnosis

基　　金：国家重点研发计划资助项目(2017YFC1500603,2017YFC1500604);国家自然科学基金资助项目(51878017)。

摘　　要：为了精准测量受压混凝土内部应力-应变关系,通过在丙烯酸树脂杆上布置电阻式应变片,测量得到混凝土试块内部应变,研发大量程微型土压力盒实现混凝土内部应力测量。将相关测试装置预埋在混凝土试块内部,完成混凝土试块单轴压缩试验,获得精准的混凝土内部应力-应变关系数据。结果表明,混凝土内部本构模型相对于传统本构模型具有良好的延性,且峰值强度远高于传统本构模型。结合国内外几种具有代表性的混凝土本构方程对试验进行了有限元模拟,针对应力-应变曲线、峰值强度及峰值应变进行了对比分析。分析结果表明:实测的混凝土内部应力-应变曲线合理准确,相关测量方法具有良好的精度和可行性;基于我国规范模型的有限元模拟结果与试验结果吻合最好,可进一步推广使用。In order to accurately measure the stress-strain relationship inside concrete under compression,resistance strain gauges are suggested to be placed on acrylic resin rods to measure the internal strain of concrete specimens.A large-scale micro earth pressure cell is developed to measure internal stress in concrete.Embedding the relevant testing equipment inside the concrete test specimen,the uniaxial compression test of the concrete is carried out,and the accurate stress-strain relationship data inside the concrete is obtained.The results indicate that the internal constitutive model of concrete has good ductility compared to traditional constitutive models,and the internal peak strength is much higher than traditional constitutive models.Combined with several representative concrete constitutive equations,the test is simulated by finite element method,and the stressstrain curve,peak strength and peak strain are compared and analyzed.The results show that the measured internal stress-strain curve of concrete is reasonable and accurate,and the relevant measurement methods have good accuracy and feasibility.The finite element simulation results based on Chinese design model are in good agreement with the experimental results,which can be further popularized.

关 键 词：混凝土 内部应力-应变曲线 本构模型 传感器 峰值强度 峰值应变 

分 类 号：TU528[建筑科学—建筑技术科学] TH823[机械工程—仪器科学与技术]