基于概率的施工期超长隔震结构单元划分方法  

Study on Unit Division Method of Ultra-long Isolated Structures During Construction Period Based on Probability

作　　者：张超[1] 杜永峰[1,2] 洪娜[1] 许军 周金良 马振和 李超[3] ZHANG Chao;DU Yongfeng;HONG Na;XU Jun;ZHOU Jinliang;MA Zhenhe;LI Chao(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,甘肃兰州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,甘肃兰州730050 [3]中国建筑第八工程局有限公司西北公司,陕西西安710075

出　　处：《湖南大学学报(自然科学版)》2025年第3期103-118,共16页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(52178291,51778276)。

摘　　要：施工期超长隔震结构所经历的环境温差和混凝土干缩作用具有一定的区域性和随机性,采用概率手段研究施工期超长隔震结构单元划分方法,以有效控制隔震层的温缩变形.首先,研究了施工期超长隔震结构单元划分机理,提出了隔震层温缩变形的控制方法.其次,基于广义极值分布模型得到了12个不同环境温湿度分布的高烈度城市最冷月平均最低温度、最热月平均温度和年平均相对湿度的最优分布模型参数,结合超长隔震结构施工期的3个环境温湿度水准,给出了不同水准下12个城市超长隔震结构综合温差的取值建议,进而提出了后浇带最大设置间距计算方法.接着,总结出了施工期超长隔震结构单元划分方法.最后,对某在建超长隔震结构单元划分方案进行优化分析,分析结果表明:在隔震层刚度生成时间不变、混凝土干缩模型确定的情况下,为了保证隔震层合成向最大温缩变形控制在55 mm的限值之内,采用后浇带划分方案3和封闭方案1时,需将最冷月隔震层温度提升至-4℃及以上.为了保证结构整体性和施工便利性,可采用后浇带划分方案2和封闭方案1,同时最冷月隔震层温度需达到-1℃及以上.The ambient temperature variation and drying shrinkage of concrete experienced by ultra-long isolated structures have certain regional and random characteristics.The probability method is used to study the unit division method of ultra-long isolated structures during the construction period to effectively control the thermal shrinkage deformation of the isolation layer.Firstly,the unit division mechanism of ultra-long isolated structures during the construction period is studied,and the control method of the thermal shrinkage deformation of the isolation layer is proposed.Secondly,based on the generalized extreme value distribution model,the optimal distribution model parameters of mean minimum temperature of the coldest month,mean temperature of the hottest month and annual average relative humidity in 12 high-intensity cities with different ambient temperature and humidity distributions are calculated.Combined with the three ambient temperature and humidity levels proposed for the construction period of ultra-long isolated structures,the recommended values of comprehensive temperature difference in 12 cities under different levels is given.Furthermore,the calculation method of the maximum setting spacing of the post-pouring belt is proposed.Then,the unit division method of ultra-long isolated structures during the construction period is summarized.Finally,the optimization analysis of unit division scheme of an ultra-long isolated structure under construction is carried out.The results show that under the condition that the stiffness generation time of the isolation layer is constant and the concrete dry shrinkage mode is determined,to ensure that the maximum thermal shrinkage deformation of the isolation layer in the synthetic direction is controlled within the limit of 55 mm,the temperature of the isolation layer in the coldest month needs to be raised to-4°C and above when the post-pouring belt division scheme 3 and the closed scheme 1 can be adopted.To ensure the integrity of the structure and the convenien

关 键 词：超长隔震结构 温度分布 湿度分布 结构单元划分 变形 

分 类 号：TU352.1[建筑科学—结构工程]