普通强度高性能混凝土脆性损伤本构试验和理论研究  

Experiment and theory study on brittle damage constitutive model of ordinary strength high performance concrete

作　　者：孙静[1] 姚谦峰[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《建筑结构学报》2009年第S2期309-314,共6页Journal of Building Structures

基　　金：国家自然科学基金项目(50578011);教育部博士点专项基金(20050004013)

摘　　要：对普通强度高性能混凝土(以下简称为普强高性能混凝土)的棱柱体试件进行了拉、压破坏过程的试验研究;在典型材料损伤模型研究的基础上,考虑普强高性能混凝土材料组分的影响,采用抛物面形式的损伤面,提出了适用于普强高性能混凝土单轴受拉和受压脆性损伤的本构模型;在与试验结果对比分析的基础上,对混凝土单轴受拉的泊松比和损伤值进行了探讨。研究结果表明普强高性能混凝土受拉的弹性强度σA大于普强混凝土;普强高性能混凝土受压的峰值应力所对应的应变与普强混凝土也有显著不同,其破裂特征也有别于普通混凝土;所建立的脆性损伤本构模型在精简参数的基础上与试验结果吻合良好,可作为普强高性能混凝土多轴受力试验和损伤模型分析的基础,并对进行普强高性能混凝土结构的损伤分析具有较重要的意义。The tensile and compressive damage process of ordinary strength high performance concrete prism columns were expermental studied.An applicable tensile and compressive constitutive model of ordinary strength high performance concrete were put forward based on the damage theory of brittle materials and assumption that the damage surface is paraboloid,considering the material composition.By comparative analysis of the experimental results,the Poisson's ratio and damage value of uniaxial tension of ordinary strength high performance concrete were discussed here.The following conclusions are obtained: the tension elastic strength σA of ordinary strength high performance concrete is higher than ordinary strength concrete.There is also significant difference between the strain corresponding to the compressive stress peak value of ordinary strength high performance concrete and orninary strength concrete,and so is the fracture feature.After simplifying the parameters,the brittle damage constitutive model established here has a good coincidence between theoretical analysis and experimental results.Therefore,this is the foundation for the further multiaxial experment and the establishment of damage model,and the contribution for the analysis of structure damage.

关 键 词：普强高性能混凝土 损伤 本构 脆性材料 

分 类 号：TU528.31[建筑科学—建筑技术科学]