Abstract
Seismic damage of spatial structures of rectangular plan with RC substructures was observed in several earthquakes, especially in the RC substructures. In order to reduce the seismic damage potential, a new structural configuration of spatial structure of rectangular plan is proposed, the substructures of which are composed of the steel substructure and the RC substructure. The latter only bears the vertical load of roof by the arrangement of horizontal sliding bearings between the roof and the RC substructure. The pushover analyses are performed on a steel braced frame and an RC frame with similar lateral stiffness, and the results show that the lateral capacity of the steel structure is much larger than those of the RC structures. A spatial structure of rectangular plan with two different substructures is designed according to Chinese structural designing codes. Seismic time history analyses are carried out for the spatial structure under five ground motions. The results show that the damage mainly concentrates on the substructures, and the seismic performance of the structure with steel and RC substructures is much better than that of the structure with RC substructures.
Highlights
Spatial structures have been widely used in gymnasia, public halls, auditorium, and stadiums
In order to reduce the seismic damage potential, a new structural configuration of spatial structures with rectangular plan is proposed, the substructures of which are composed of two parts: the steel substructure bearing the horizontal and vertical loads of roof and the reinforced concrete (RC) substructure only bearing the vertical load of roof. e seismic performances are studied by static pushover analyses and seismic time history analyses under different ground motions
Seismic damage of spatial structures of rectangular plan with RC substructures is observed in several earthquakes, especially in the RC substructures
Summary
Spatial structures have been widely used in gymnasia, public halls, auditorium, and stadiums. E seismic performance of roofs will be greatly influenced by substructures [1,2,3] It has been proven by many earthquakes that the seismic damage of spatial structures is relatively light compared with the multistory structures, the damages are reported in several earthquakes [4,5,6,7,8,9], especially in the structural part around roof bearings and RC substructures. The spherical latticed domes including their substructures were seldom damaged, and most of the damaged spatial structures were in the form of rectangular plan, regardless of the roof type of cylindrical latticed shells, flat spatial trusses, and chevron moment frames. In order to reduce the seismic damage potential, a new structural configuration of spatial structures with rectangular plan is proposed, the substructures of which are composed of two parts: the steel substructure bearing the horizontal and vertical loads of roof and the RC substructure only bearing the vertical load of roof. e seismic performances are studied by static pushover analyses and seismic time history analyses under different ground motions
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