某高层办公楼装配式结构方案选型分析

Precast structural scheme selection analysis for a high-rise office building

针对目前装配式建筑普遍存在的钢筋碰撞严重、现场满堂支撑等引起的施工效率低的问题,提出了全装配式钢-混凝土混合框架结构体系。该体系采用预制混凝土柱、预制梁柱节点和钢梁,预制柱和预制节点采用套筒灌浆和灌浆金属波纹管连接,预制节点内预埋钢骨,通过钢牛腿与钢梁连接,楼板采用钢筋桁架楼承板,实现了免模少撑全装配式施工。以某高层办公楼为例,重点对装配整体式混凝土框架结构(PC)、装配式钢框架结构(PS)和全装配式钢—混凝土混合框架结构(PCS)三种方案进行结构分析和经济成本分析。分析结果表明,三种体系在结构计算整体指标相当的情况下,PCS体系与PC体系相比施工工期节省65天,成本相当;与PS体系相比成本缩减40%左右,施工工期相当。相比之下,PCS体系施工快捷、经济合理、工业化程度高,适合在装配式公共建筑的大面积推广。

Existing precast buildings generally had the shortcomings of low construction efficiencies such as serious steel bar collisions,full support on site etc.In order to solve these problems,a fully assembled Precast Steel-Concrete hybrid frame structure(PCS)system consisting precast reinforced concrete columns,precast beam-column joints and steel beams was proposed in this paper.The columns and beams were connected by the embedded steel member,grout sleeves and grout metal bellows,and the steel bar truss floor deck was adopted for achieving rapid construction.Take a structural scheme selection for a high-rise office building as an example,the PCS system was compared with the Precast Concrete(PC)frame structure system and the Precast Steel(PS)frame structure system in terms of their structural performance,material cost and time cost.Comparative result shows that when the overall indicators of the three systems is equivalent in structural calculation,the construction period of PCS system is shortened by 65 days comparing to PC system,and the cost is reduced by 40%comparing to PS system.It is concluded that the PCS system has the characteristics of fast construction,reasonable economy and higher industrialization,which is suitable for large-scale promotion in prefabricated public buildings.