施工阶段多(高)层建筑钢筋混凝土结构统一模型

为便于现场施工组织和安全检验,针对多(高)层建筑混凝土结构施工阶段,建立了一个包含了基础刚度与施工模板支撑薄弱层参数的统一模型。分析结果表明,建筑底部楼层承担的施工荷载随基础刚度降低而增大,当基础刚度降低到相当于0.5倍楼板厚度时,最大施工荷载比率会超过刚性基础条件下的最大施工荷载比率约3.2%;施工模板支撑薄弱层导致其上楼板承担的施工荷载增大,其下楼板承担的施工荷载减小,变化幅度约4.3%。因此,施工阶段必须考虑到基础刚度与模板支撑薄弱层。

Unified model of reinforced concrete structures of multi-story or high-rise buildings during construction

A unified model was developed to organize construction conveniently and check safety of the structures in site for reinforced concrete structures of multi-story or high-rise buildings. The model accounted for stiffness of the foundation and the insufficient level shores. Analyzing results show that the loads on the lowest several slab levels in the buildings will increase with decreasing foundation stiffness for some types of construction schedules, and may even exceed the maximum slab load. When the stiffness of foundation is decreased to 0.5 times thickness of the slab, and the maximum slab load will be over the maximum slab load of the rigid foundation by as much as 3.2%; the insufficient level shores will increase loads on the slab and reduce the loads under the slab by as much as 4.3%. Consequently, foundation stiffness and insufficient level shores should be taken into account during construction.