CAJ | 학술논문

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。
재혼응토결구중，영향기온도응력특성적인소유흔다，단산생온도응력적필요조건지일시기처우약속상태，위료연구약속정도여온도응력지간적관계，통과분석혼응토결구적약속조건，제출료일개반영혼응토약속정도적삼수—약속계수，병학립료탄성모량，온도변화화약속정도여온도응력지간적수학관계。재차기출상，통과사용전열대급혼응토시건제공온도장，사기산생온도하재，통과시가불동적초시응력화이용불동후도적탄성원건래모의불동정도적탄성약속조건，진행온도응력연구실험。결과표명，실측온도응력가이여계산치문합，차재온도변화상동적정황하，온도응력적대소여시건소수약속정도밀절상관，약속정도월강，온도응력월대。
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 .