Analysis On The Mechanical Behaviors Of Reinforced Concrete Coupling Beams In Shear Wall Structure

Reinforced concrete shear wall structure is the main structure form of high-rise residential buildings in urban construction. Coupling beam, as the important member connecting shear walls, is in the first line resisting earthquake. Since the coupling beam is so important, it should be paid more attention to the design of it. At present, the research of coupling beams has made great progress, and in the new" code for design of concrete structures"(GB50010-2010),there are more advance methods in coupling beams design. However, these studies which have made some achievements are only in relatively small cross high beams. At present, the research for coupling beams whose span-depth ratio is between2-3is still not perfect. It still takes experience design methods in project. Therefore, the finite element simulation analysis for coupling beams will have important practical significance. Especially for span-depth ratio is between2-3.This paper uses PKPM, building structure design software, in whole simulation analysis for a actual engineering. By changing span-depth ratio, the reinforcement forms, and concrete strength grade of coupling beams, using large general finite element analysis software ANSYS, to compare the structural mechanical behaviors in every situation, to search for a more effective scheme. The main contents are as follows:l.By using PKPM building structure design software, make elastic response spectrum analysis under vertical load for an actual shear wall structure engineering, The main conclusions:The coupling beam of shear wall structure whose span to height is small has a better behaviors in overall stability, seismic performance and other aspects. With the span-depth ratio of coupling beam is reduced, the stability of the whole structure and seismic performance has an obvious increase.2. Using the large-scale general finite element analysis software ANSYS, to make analysis for coupling beam of shear wall structure in stress, fracture morphology, structure deformation and other aspects under horizontal load, The results showed that, when increase the concrete strength grade, the yield load, limit load, yield displacement and ultimate displacement of components all have greatly enhance, by comparison, ductility coefficient decreased.3. By changing the reinforcement schemes of coupling beam of shear wall, using the large-scale general finite element analysis software ANSYS, to make analysis in stress, fracture morphology, and other aspects. The results showed that, compare to ordinary reinforcement, the contribution of oblique stress bar on relieving beam crack is limited, is not the most effective and reasonable reinforcement scheme, should be improve the working performance of the continuous beam in other aspects.4. By changing the reinforcement ratio of coupling beam of shear wall, using the large-scale general finite element analysis software ANSYS, compare mechanical behaviors in every situation, The results showed that, when the beam longitudinal stress reinforcement ratio and stirrup ratio increases, the structure of bearing capability is not ideal, ductility performance also did not improve greatly, so design of reinforcement should still accord to structural requirements.