施工期现浇钢筋混凝土结构的受力特性  

PERFORMANCE OF CASTING IN-SITE CONCRETE BUILDINGS DURING CONSTRUCTION

作　　者：赵挺生[1] 方东平[1] 顾祥林[2] 张誉[2] 

机构地区：[1]清华大学建设管理系,北京100084 [2]同济大学建筑工程系,上海200092

出　　处：《工程力学》2004年第2期62-68,共7页Engineering Mechanics

基　　金：国家自然科学基金(50378051);中国博士后科学基金资助项目(2003);教育部优秀青年教师资助计划项目

摘　　要：施工期现浇钢筋混凝土结构是时变结构,正确认识其受力特性对于施工过程的安全控制具有重要意义。针对施工期现浇钢筋混凝土结构的时变性,定义楼板刚度与模板支撑的刚度比为施工时变结构体系的弹性特征值,建立了以施工时变结构体系弹性特征值为参数的现浇钢筋混凝土结构施工受力性能分析的弹性支撑连续梁模型,基于该模型,分析了施工期现浇钢筋混凝土结构的受力特性,发现在特定施工方案下,当施工时变结构体系的弹性特征值较小时,最大施工荷载出现的楼层位置会提前,而拆模时间也会改变最大施工荷载出现楼层的位置;施工时变结构体系的弹性特征值和拆模时间都影响楼层承担的最大施工荷载比率(荷载比率定义为结构承担荷载与楼板自重的比值);施工期楼层承担的最大施工荷载随楼层位置呈现波动特性,随楼层位置增高波幅逐渐减小,最后趋于稳定。Casting in-site concrete buildings during construction is time-dependent and of importance for controlling the safety and recognizing the properties of its bearing loads. An elastic characteristic value which is defined as the ratio of stiffness of slab to the shore is introduced for the time-dependent structures. A model of continuous beam with spring supports is put forward to analyse time-dependent structural systems. Comparing the results of the model with that of other methods and the results measured from concrete building during construction, good agreement is reached. Principles of bearing loads of time-dependent structural system are given. Position of the maximum bearing construction load of floor can be moved up, when the elastic characteristic value of time-dependent structures were smaller, and the time of shore removal can also change the position of the floor maximum bearing construction loads. The elastic characteristic value of time-dependent structures and the time of shore removal, both have effects on the ratios of maximum construction loads borne by floors. Maximum construction loads borne by floors are of wave form with the position of floor. The lower the position of floor, the larger the wave of construction load, diminishing in the end.

关 键 词：钢筋混凝土结构 施工过程 时变结构体系 受力性能 

分 类 号：TU318[建筑科学—结构工程]