水工混凝土动态压缩本构关系试验研究  

Experimental Study on Dynamic Compression Constitutive Relationship of Hydraulic Concrete

作　　者：张宇 郭旭 李黄河 ZHANG Yu;GUO Xu;LI Huanghe(Department of Civil Engineering and Architecture,Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]东北石油大学土木建筑工程学院,黑龙江大庆163318

出　　处：《甘肃科学学报》2022年第4期65-69,共5页Journal of Gansu Sciences

基　　金：国家自然科学基金地区项目(51969010,51669008)。

摘　　要：通过单轴压缩试验研究水工混凝土材料动态压缩力学性能,并用公式推导其动态压缩损伤因子,为大坝地震损伤分析提供参数依据。在10^(-5) s^(-1)至10^(-2) s^(-1)的应变速率范围内对立方体试件进行单轴压缩试验研究,分别对其强度特性、峰值应力处应变、弹性模量与应变速率关系进行分析,得到其率相关公式。基于《混凝土结构设计规范》得到考虑不同应变速率的混凝土材料压缩本构关系。根据能量等效性假设,通过材料压缩损伤演化参数推导压缩损伤因子,从而建立压缩应力与压缩损伤因子之间的联系。研究结果表明,水工混凝土材料压缩力学性能率相关性明显,应变速率10^(-2) s^(-1)对应的峰值强度较应变速率10^(-5) s^(-1)对应的峰值强度提高17.5%。在进行大坝地震损伤分析时,应谨慎选择材料动态力学特性及其对应的损伤因子。The dynamic compression mechanical properties of hydraulic concrete materials are studied by uniaxial compression test,and the dynamic compression damage factor is derived from the formula to provide parameter basis for the seismic damage analysis of dam.In the strain rate range of 10^(-5) s^(-1) to 10^(-2) s^(-1),the uniaxial compression test of the cube specimen was carried out.The relationship between the strength characteristics,the strain at the peak stress,the elastic modulus and the strain rate are analyzed respectively to obtain the rate-dependent formula.Based on code for design of concrete structures,compressive constitutive relations of concrete materials considering different strain rates are obtained.According to the assumption of energy equivalence,the compressive damage factor of the material is derived from the compressive damage evolution parameters.On this basis,the relationship between peak compressive stress and compressive damage factor is established.The results of this study show that the rate dependence of the compressive mechanical properties of hydraulic materials is obvious.In the analysis of dam seismic damage,the dynamic mechanical properties of materials and their corresponding damage factors should be carefully selected.

关 键 词：水工材料 动态特性 单轴压缩 本构关系 损伤因子 

分 类 号：TV331[水利工程—水工结构工程]