Design and Structural Performance Analysis of a Novel 72 m-Span Steel Box Girder-Concrete Laminated Slab Composite Floor System
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摘要: 针对钢桁架性能和施工难题,提出新型钢箱梁+开槽型混凝土叠合板的组合楼盖体系,与钢桁架组合楼盖体系相比,钢箱梁组合楼盖的梁高降低18.8%~24.4%。针对采用钢箱梁和钢桁架梁的两种方案的整体结构,建立有限元计算模型进行分析,结果发现:两种方案的结构自振特性相近;采用钢箱梁-混凝土叠合板的组合结构体系,在多遇地震作用下结构的X、Y向最大层间位移角为1/992和1/846,与钢桁架组合结构体系相比更小;在罕遇地震下X、Y向最大弹塑性层间位移角为1/219和1/210,与钢桁架组合结构体系相比更大,且抗震性能均满足GB/T 50011—2010《建筑抗震设计标准》的要求。对两种结构形式的楼盖舒适度进行分析,二者指标基本相同。表明钢箱梁-混凝土叠合板组合楼盖体系可以在满足整体结构抗震和楼盖舒适度要求的情况下,显著降低梁高。Abstract: In response to the performance and construction challenges of steel trusses, a novel composite floor system composed of steel box girders and slotted laminated slabs is proposed. Compared with the truss composite floor system, the beam height is reduced by 18.8% to 24.4%. A finite element model was established to analyze the overall structural behavior of the two schemes. The results showed that the natural vibration characteristics of the structure with truss beams were similar to those with steel box girders. Under frequent earthquakes, the maximum inter-story drift angles of the steel box girder-concrete laminated slab composite floor system in the X and Y directions were 1/992 and 1/846, respectively, which were smaller than those of the truss composite floor system. Under rare earthquakes, the maximum elastic-plastic inter-story drift angles in the X and Y directions were 1/219 and 1/210, respectively, which were larger than those of the truss composite floor system. Nonetheless, the seismic performance of both systems met the requirements of Code for Seismic Design of Building(GB/T 50011-2010). An analysis of floor comfort for both systems indicated that the indicators were essentially the same, demonstrating that the steel box girder-concrete laminated slab composite floor system significantly reduces beam height while meeting the structural seismic and floor comfort requirements.
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