约束程度与温度应力之间的关系研究  

Study on the Relationship between the Constraint Degree and Thermal Stress

作　　者：亢景付[1,2] 赵蒙蒙[1,2] 蒋元成[1,2] 荆锐[1,2] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]滨海土木工程结构与安全教育部重点实验室(天津大学),天津300072

出　　处：《水利与建筑工程学报》2014年第6期21-25,共5页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金资助项目(50979068)

摘　　要：在混凝土结构中,影响其温度应力特性的因素有很多,但产生温度应力的必要条件之一是其处于约束状态,为了研究约束程度与温度应力之间的关系,通过分析混凝土结构的约束条件,提出了一个反映混凝土约束程度的参数—约束系数,并确立了弹性模量,温度变化和约束程度与温度应力之间的数学关系。在此基础上,通过使用电热带给混凝土试件提供温度场,使其产生温度荷载,通过施加不同的初始应力和利用不同厚度的弹性元件来模拟不同程度的弹性约束条件,进行温度应力研究实验。结果表明,实测温度应力可以与计算值吻合,且在温度变化相同的情况下,温度应力的大小与试件所受约束程度密切相关,约束程度越强,温度应力越大。In concrete structures ,there are many factors that influence the thermal stress properties ,concrete structures in constraint state is one of prerequisites for generating thermal stress .In order to research the relationship between the constraint degree and thermal stress ,a parameter called constraint coefficient was put forward based on the constraint con-dition analysis of concrete structures ,and a formula for determining concrete thermal stress based on elastic modulus , temperature variation and the constraint degree was derived .Based on the analysis ,the electrical ribbon heater was adopted to provide a temperature field for the concrete test pieces ,which produced a temperature load ,meanwhile the different intensity of elastic constraint were simulated by applying different initial stresses on the pieces and adjusting the thickness of the elastic components .Test results indicate that the measured thermal stresses and theoretical values are in good agreement .Moreover ,at the same temperature variation ,concrete thermal stress is closely related to the constraint degree of concrete test pieces ,the stronger the constraint degree ,the greater the thermal stress .

关 键 词：温度应力 弹性约束 约束系数 实验测定 振弦式应变计 

分 类 号：TU317.3[建筑科学—结构工程]