超长隔震结构混凝土干缩应变分离与温缩变形预测  

Concrete drying shrinkage strainseparation and thermal shrinkage deformation prediction in very⁃long isolated structures

作　　者：杜永峰[1,2] 张超[1] 李虎 王光环 李超[3] 马振和 DU Yongfeng;ZHANG Chao;LI Hu;WANG Guanghuan;LI Chao;MA Zhenhe(Institute of Earthquake Protection and Disaster Mitigation,Lanzhou University of Technology,Lanzhou 730050,China;International Research Base of Seismic Mitigation and Isolation of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China;Northwest Branch of China Construction Eighth Engineering Bureau Co.,Ltd.,Xi’an 710075,China)

机构地区：[1]兰州理工大学防震减灾研究所,兰州730050 [2]兰州理工大学土木工程减震隔震技术研发甘肃省国际科技合作基地,兰州730050 [3]中国建筑第八工程局有限公司西北公司,西安710075

出　　处：《振动与冲击》2025年第4期253-264,共12页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(52178291)。

摘　　要：隔震层温缩变形是评估超长隔震结构全过程性能状态的重要参数之一,为充分掌握隔震层温缩变形规律,并实现对隔震层温缩变形预测,首先建立了隔震层温缩位移一维等直梁比拟模型,给出了隔震层水平温缩位移的求解方法。其次提出了温缩位移系数,通过验证该系数计算的准确性,以保证综合温差估计的合理性;提出了隔震层均方根温度,以较为精准地估计隔震层温度;在此基础上,给出了隔震层混凝土干缩应变分离与温缩变形预测方法。最后以严寒地区某超长复杂隔震结构为研究对象,建立了隔震层均方根温度相关性模型,为观测时间点隔震层温度预测提供依据;分离得到了隔震层各测点混凝土干缩应变,利用双指数函数拟合得到了混凝土干缩预测模型,为预测混凝土各龄期下干缩应变提供参考;进而对隔震层温缩变形进行了预测,分析结果表明:采用隔震层均方根温度相关性模型和双指数干缩预测模型,能够较为精准地预测隔震层各测点的合成向温缩变形,从而为超长隔震结构全过程的性能评估奠定基础。The thermal shrinkage deformation of the isolation layer is one of the important parameters to evaluate the whole process performance state of very⁃long isolated structures.In order to fully grasp the thermal shrinkage deformation law of the isolation layer and realize the prediction of thermal shrinkage deformation of the isolation layer,firstly,a one⁃dimensional uniform straight beam analogy model of thermal shrinkage displacement of the isolation layer was established,and a solution method of horizontal thermal shrinkage displacement of the isolation layer was given.Secondly,the thermal shrinkage displacement coefficient was proposed,and the accuracy of the coefficient calculation was verified to ensure the rationality of the comprehensive temperature difference estimation.The root mean square temperature of the isolation layer was proposed to estimate the temperature of the isolation layer more accurately.On this basis,a method for drying shrinkage strain separation and thermal shrinkage deformation prediction of the isolation layer concrete was given.Finally,a very⁃long complex isolated structure in severe cold area was taken as the research object,the root mean square temperature correlation model of the isolation layer was established,which provides a basis for predicting the temperature of the isolation layer at the observation time point.The concrete drying shrinkage strain at each measuring point of the isolation layer was separated,and the concrete drying shrinkage prediction model was fitted by double exponential function,which provides a reference for predicting the concrete drying shrinkage strain at each age.Furthermore,the thermal shrinkage deformation of the isolation layer was predicted.The analysis results show that the synthetic thermal shrinkage deformation of each monitoring point of the isolation layer can be accurately predicted by using the root mean square temperature correlation model and the double exponential concrete drying shrinkage prediction model,thus laying foundation for

关 键 词：超长隔震结构 温缩变形 均方根温度 干缩应变 预测 

分 类 号：TU352.1[建筑科学—结构工程]