约束高强混凝土三轴受压本构模型分析  

Study on the stress-to-axial strain relationship of confined high-strength concrete under triaxial compression

作　　者：党伟[1] 申世飞[2] 

机构地区：[1]西安航空学院,陕西西安710077 [2]西安热工研究院有限公司,陕西西安710054

出　　处：《世界地震工程》2016年第2期100-106,共7页World Earthquake Engineering

摘　　要：侧向约束能够提高高强混凝土抗压强度,有效改善延性,合理本构模型的表述对结构非线性分析意义显著。基于281组三轴受压约束混凝土构件试验结果,建立了峰值应力和峰值应变与侧向约束的计算模型,并与现有Attard and Setunge模型、Candappa模型和Lu and Hsu模型、Jiang and Teng模型进行对比,评估模型的准确性;进而,采用Popovice模型,建立了适用于普通和高强混凝土的本构模型。研究表明:建立峰值应力和峰值应变模型计算值与试验值较为接近,基于其建立的高强混凝土三轴受压本构模型曲线与试验曲线吻合较好,为高强混凝土三轴受压约束构件的非线性分析提供理论依据。It is well established that the use of lateral confinement can significantly enhance the strength and ductil- ity of high-strength concrete （ HSC）, and reasonable selection of constitutive model of HSC has largely effect on nonlinear analysis of structure elements. This paper presents a study on the behavior and modeling of the stress - strain curves of confined HSC under triaxial compression by collecting 281 test results. The peak stress and corre- sponding peak strain model are established. To evaluate the accuracy of proposed model, the calculated results are compared with results from other existing model, such as Attard and Setunge model, Candappa model, Lu and Hsu model and Jiang and Teng model. Based on the stress - strain equation originally proposed by Popovics model, a constitutive model for both the actively confined normal and high strength concrete is also established. It is eventu- ally found that the peak stress and peak strain model shows more accuracy than other existing models for actively confined HSC. The stress- strain curves predicted by the analysis- oriented constitutive model are in close agree- ment with the experimental curves, which provided theoretical basis for the nonlinear analysis of structure elements.

关 键 词：高强混凝土 三轴受压 本构模型 对比分析 

分 类 号：TU375.3[建筑科学—结构工程]