The Analyse And Experimental Study Of Short-Span Coupling Beams Of Frame-Tube Structure In Chongqing And The Anti-Shear Design Method For Joints

Coupling beams are important elements in tube structure, their strength stiffness, ductility can affect the behavior of structure directly. My study mainly on short-span coupling beam's seismic resistant behavior in tube structure of Chongqing.In this paper the author use non-linear strcture analyse procedure compiled by our research term to simulate earthquake affect to three frame-tube structure. This three structure's coupling beam separately has a span-to-depth ratio of 2.0 ,1.5 and 1.0. Befor the simulation ,these three structures are designed strictly defers to correlation stipulation of Chinese structure code of six-degree area. After the simulation we can know the ductility demand of coupling beam under earthquake affect. Then through series experiment of coupling beams only add diagonal bars on the basis of traditional reinforcement with Zhanlin, we can conclude this plan for steel bar can satisfied the ductility demand of short-span coupling beams in tube body structure of Chongqing area.Through the computer simulation we can know: Procedures outputs coupling beams'ductility demand mainly in 1.5 to2.0 (maximum value 2.2), comparing the simulation of 8 or 9 degree , we can see the response of the whole structure and yielding degree are much small. We can conclude if a steel bar plan can give the coupling beam a ductility of 3.0, the beam already achieve the demand of seismic resistant.Through the following experiment the author complete 8 short-span coupling beam specimens with master Zhanlin. These specimens are all designed through diagonal bars plan, and have a shear-compression ratio beyond 0.2.All of the specimens has a ductility beyond 3.5,except two failure specimens. So we can conclude ,the diagonal bars plan can make the ductility of short-span coupling beam steady beyond 3.5,and the shear-compression ratio may raise a little.