内框架箱型混凝土结构施工活荷载实测分析

摘要

施工期早龄期钢筋混凝土结构与模板支撑系统组成临时承载体系为时变结构，其承担的荷载主要有新浇筑混凝土自重与包括施工人员和设备荷载以及混凝土浇筑时产生的冲击和振捣荷载在内的施工活荷载。将多层连续施工时变结构体系模拟成一组弹性支撑连续板，根据该模型分析了施工期现浇钢筋混凝土结构的受力特性。根据现场实测数据，以构件有效承载面积为统计对象，计算了混凝土施工荷载的统计参量，并参考相关研究成果，以95％的置信度对施工期活荷载标准值进行反演，建议施工活荷载标准值取2．5 kN／m2。%The temporary supporting system also referred as time-dependent structural system during construction,consist of early-age reinforced concrete structures and formwork supporting system.It bears the load including the new concrete weight and the live construction load.A model of continuous beam with spring supports is put forward to analyze the mechanical characteristics of the reinforced concrete structures during construction.Based on-site measuring data,effective bearing area of members were used as statistical objects to calculate statistical parameters of live construction load of concrete buildings.By referring todomestic and foreign achievements,the the standard value of the live construction load was inverted with 95% reliability and standard value of live construction load of 2.5 kN/m2 .is recommended .