单轴受压下高强次轻混凝土应力-应变关系及泊松效应研究  

Study on the stress-strain relation and poisson effect of high-strength semi-lightw eight concrete under uniaxial compression

作　　者：蔡少熳 向天宇[1,2] 赵福超[1,2] 沈宏任 杜斌 

机构地区：[1]西华大学建筑与土木工程学院,四川成都610039 [2]西华大学绿色建筑与节能重点实验室,四川成都610039 [3]贵州大学土木工程学院,贵州贵阳550025

出　　处：《混凝土》2017年第12期54-57,62,共5页Concrete

基　　金：西华大学研究生创新基金(ycjj2016183);西华大学绿色建筑与节能重点实验室开放基金资助项目(szjj2015-077);西华大学重点基金资助项目(Z1510611);西华大学研究生创新基金(ycjj2016083);国家自然科学基金资助项目(51678030);贵州省交通运输厅资助项目(2015-123-041)

摘　　要：用页岩陶粒取代部分天然粗骨料,配制高强次轻混凝土,进行了高强次轻混凝土的力学性能试验。研究了陶粒的不同体积取代率对高强次轻混凝土的应力-应变关系以及泊松比的影响。试验结果表明,随着陶粒取代率的增加,高强次轻混凝土的弹性模量有所降低,泊松比比普通混凝土较大。同时,高强次轻混凝土的应力-应变曲线在形状上与普通混凝土相似,峰值点应力和应变随着陶粒取代率的增加而增加。在考虑原点切线模量、峰值点割线模量和峰值点应变等参数的基础上,提出了基于Sazen模型的高强次轻混凝土的应力-应变关系模型。The mechanical properties of the high-strength semi-lightweight concrete,in which the nature aggregates are partially replaced by shale ceramisites, are investigated experimentally in the present study.The influences of the volume fraction of ceramsite on the stress-strain relation and Poisson effect of high-stength semi-lightweight concrete are studied,The experimental results show that with the increment of the ceramsite content, the modulus of elasticity of the high-strength semi-lightweight concrete decreases to some extent,and the Poisson ratio is comparably larger than that of normal concrete.Meanwhile,the stress-strain relation curve of high-strength semi-lightweight concrete is similar with that of the normal concrete, and the peak stress and strain increase with the content of ceramsite. With such parameters as the original tangential modulus,the peak secant modulus and the peak strain,a stress-strain relation based on Sazen model is proposed for the high-strength semi-lightweight concrete.

关 键 词：高强次轻混凝土 应力-应变关系 泊松比 弹性模量 

分 类 号：TU528.01[建筑科学—建筑技术科学]