| Reinforced concrete slab-column structure and unbonded prestressed slab-column structure are the structures linking through the node by slabs and columns. Its characteristic is that there is no beam except the frame side beam under the slab, the floor load can be transferred from the slab to the column directly and then to the foundation, which can greatly simplify the load system. Aseismic performance of slab-column structure remains controversial by domestic scholars, which have some degree of hindered the promotion and popularization of this structure. Therefore, based on the analysis of domestic and foreign scholars, this paper had a further research on the aseismic performance of unbonded prestressed slab-column structure. This paper plans to explore the problem mainly from the following parts.1. With the help of PKPM structure design program, we design and establish the slab-column structure analysis model and then we can obtain the relevant prestressed RC slab-column structure model by applying the prestressed reinforcement equivalent load to the slab-column structure analysis model.2. With the help of SAP2000finite element analysis program, we comparatively analyzed the dynamic features of prestressed RC slab-column structure, RC slab-column structure and RC frame structure model and researched on the variations of natural vibration period of this three kind structure. In this way, we can have a further comprehension of the features of structure stiffness. In addition, we also have some investigation on the choosing of the reasonable mode-number.3. Under the effect of frequent earthquake, all the three kinds of structure model will get in the elastic stage. So, this paper contrasted the aseismic responses of these three structures under frequent aseismic actions by using response spectrum method and then we can confirm that the aseismic performance of prestressed RC slab-column structure can meet the requirement of Chinese aseismic code though its aseismic performance is weaker than the frame structure. In the areas of intensity7, under the premise of story height under3.6m, the prestressed slab-column structure should not be taller more than eight floors; in the areas of intensity8or above8, we propose not to build the prestressed slab-column structure4. Through the pushover analysis, we have researched on the effect of the slab-thickness and floor-number on the aseismic performance of the prestressed slab-column structure under different aseismic action levels. According the analysis, we get the conclusion that increasing thickness of the slab can help to improve the aseismic performance of the prestressed slab-column structure. Besides, with the increase of floor, the aseismic performance decline5. By comparing these three kinds of structure model, we found that the arrangement of prestress has limited influence on both of the improving of aseismic performance and the plastic hinge mechanism of the structure.6. Through the elastoplastic time-history analysis, we have contrasted the aseismic performance of these three structures under the conditions of different aseismic waves and different acceleration-seismic waves in the same situation, and synthesizing results of pushover analysis, we got the conclusion that the aseismic performance of prestressed RC slab-column structure is weaker than the RC frame structure. Furthermore, under the premise of less than eight floors and story height under3.6m, prestressed RC slab-column structures can well meet the requirements of No Collapsing in the Strong Earthquake in the areas of intensity7. |
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