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作 者:贾冉旭 王理军 黄杰卿 邵志兵 岳媛琦 JIA Ranxu;WANG Lijun;HUANG Jieqing;SHAO Zhibing;YUE Yuanqi(Zhongtian Construction Group Co.,Ltd.,Shanghai 201102,China;Zhejiang Dadi Geological Survey and Design Co.,Ltd.,Hangzhou 310020,Zhejiang,China)
机构地区:[1]中天建设集团有限公司,上海201102 [2]浙江大地勘测设计有限公司,浙江杭州310020
出 处:《建筑施工》2024年第6期918-921,926,共5页Building Construction
基 金:浙江省建设科研项目(2023K185);中天建设集团研发课题(ZTYF-2023-05)。
摘 要:依托超高超跨现浇混凝土框架仓储厂房,为避免巨量高支模搭设,设计了钢平台支模体系。钢平台主体采用321型贝雷架+加长桁架的形式,可以适用于不同跨度、宽度的大跨梁支模,通用性较好,便于周转使用。使用大型有限元软件对钢平台支模技术进行了施工过程模拟分析,研究表明,钢平台承载力高、刚度大,最大应力比为0.68,有较大安全储备,施工完成后结构挠度较小,可以满足规范要求;楼板安装及浇筑时,钢平台分担的增量荷载较小不超10%;提出的钢平台分担比例估算方法,其计算结果与有限元解接近,且对于钢平台设计偏安全。在项目实施过程中进行了混凝土肋板堆载试验、钢平台堆载试验以及施工监测。根据混凝土肋板试验结果对其设计参数进行了优化;钢平台堆载试验结果表明其挠度及承载力均满足要求;施工监测结果与有限元结果吻合较好。To avoid the necessity for erecting a large number of high formworks,a steel platform formwork system is designed for use with the super-high and super-span cast-in-place concrete frame storage workshop.The main body of the steel platform incorporates a 321 Bailey frame integrated with an extended truss,making it suitable for large-span beam formwork across various spans and widths.And it has good versatility and is convenient for reuse.In addition,the construction process of steel platform formwork technology is simulated and analyzed by using large-scale finite element software.Research reveals that the steel platform has high load-bearing capacity and great rigidity,with a maximum stress ratio of 0.68 and a considerable safety margin.After construction is completed,the structural deflection is small,meeting the requirements of the specifications.During the installation and pouring of the floor slabs,the incremental load borne by the steel platform is relatively small,not exceeding 10%.The proposed method for estimating the proportion of load borne by the steel platform yields calculation results that are close to finite element solutions and is biased towards safety in the design of the steel platform.During the project implementation process,a series of tests and monitoring activities are conducted,including a surcharge test on the concrete ribbed slab,a surcharge test on the steel platform,and ongoing construction monitoring.The design parameters were optimized based on the test results of the concrete ribbed slab,and the subsequent load test of the steel platform demonstrated that both deflection and bearing capacity met the requirements.Moreover,the construction monitoring results correlated well with the finite element analysis outcomes.
分 类 号:TU765[建筑科学—建筑技术科学]
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