Research and Application on the Mechanical Properties of Lateral Bracing in Steel Warehouse Structures
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摘要: 仓储建筑正朝着大跨度、高层化、重载化方向快速发展,其钢结构抗侧力体系面临“大荷载、大柱距、大层高”与高烈度抗震设防(“三大一高”)的严苛要求,对承载力、刚度、延性及经济性提出了综合挑战。为此,系统梳理了各类中心支撑与偏心支撑的构型特征及力学性能,聚焦于耗能构件的选型与支撑布置原则。在既有研究基础上,提出两类新型可替换耗能梁段,为工程应用提供参考。同时进一步研究门式刚架中耗能梁段长度对结构承载及耗能性能的影响,明确人字形支撑与门式支撑在耗能机制上的差异。针对不同荷载需求和建筑规格,提出低承载力高延性与高承载力低耗能两类设计策略满足差异化需求。此外,对比分析了门式支撑体系下桁架式梁与实腹式梁结构的抗侧性能,揭示实腹式梁耗能性能优于桁架式梁的内在机理。Abstract: Warehouse buildings are rapidly evolving toward long-span, large-height, and heavy-load structural systems. Their steel lateral-force-resisting systems are confronted with stringent requirements of “large loads, large column spacings, and large story heights” combined with high-intensity seismic fortification (the “Three Larges and One High” scenario), posing comprehensive challenges to bearing capacity, stiffness, ductility, and material cost. This paper systematically reviews the structural characteristics and mechanical properties of various types of concentrically braced frames and eccentrically braced frames, with a focus on the selection of energy-dissipating components and bracing layout principles. Based on existing research, two types of novel replaceable energy-dissipating beam segments were proposed to provide reference for engineering applications. Further investigations were conducted on the influence of the energy-dissipating beam segment length on the load-bearing and energy-dissipation performance of portal frames, and the differences in energy-dissipation mechanisms between chevron bracing and portal bracing were clarified. To accommodate varying load demands and building specifications, two design strategies—low-bearing-capacity with high-ductility and high-bearing-capacity with low-energy-dissipation—were proposed to meet differentiated requirements. In addition, the lateral performance of truss girders and solid-web girders within the portal bracing system was compared and analyzed, revealing the underlying mechanism by which solid-web girders exhibit superior energy-dissipation performance over truss girders.
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