Effect Of Floor Slab On Energy Dissipation Of RC Frame Under The Bi-directional Seismic

It is a difficult to estimate the role of slab which take part in the energy dissipation of structure,especially in the space framework the role of floor is more complex under the action of bi-directional seismic,involving more relevant variables. At home and abroad have done a lot of tests ,most of which based on the perspective of uni-direction seismic to consider the role of slab and the conclusion is approximate. It's always to use the effective Flange With to take into account the influence of the strength and stiffness of frame beam. The purpose of this paper is to find a method to more reasonable consider the slab how to participation in the force on the frame beam end on a certain extenton these purposes, the research includes the following aspects:First,selected a typical and targeted interior Beam-Column joint test which include two-way loaded and floor to analysis. Specific analysis include following aspects:â‘ To make a theoretical comparison of the yield strength on the beam end sectionâ‘¡Based on a preliminary conclusion,through the ABAQUS finite element analysis model to make nonlinear analyze. Make a comparison analysis between finite element analysis and experimental resultsits in orde to be a validation and explored a reasonable method to consider the role of slab energy dissipation;â‘¢Basis the work done above,the paper selected the two factors botn of thickness and reinforced to design two groups respectively, through it to explore the reasonably method to considere the role of slab on energy dissipation.Second, the basis of the conclusions in the first step, according to research needs, in strict accordance with our standard GB50010-2002 and GB50011-2001 to consider the provisions of the design of four different flange widths of reinforced concrete frame, and nonlinear dynamic analysis platform OpenSees on rare earthquake was carried out under the multi-wave input response analysis, specific studies, including the following points:â‘ For the entire space frame of seismic wave selection,because the study is to consider a bi-direction seismic effect of space frame,so the seismic waves of the selected use of the space frame of the election wave method and the conventional plane frame the election wave and double wave band selection method has a great difference;â‘¡The Suoshe Ji's four consider different flange width of the space frame seismic waves are inputted in the Fan Ying analysis, Juti inspection Neirong including space law framework of Zhengti response (peak lateral, layer Jian drift, floor of the lateral Fenbu law etc.) and local reaction rules (rod-side fiber strain distribution in plastic hinge rods, rotation degree of ductility demand and bars, etc.), based on consideration of these reactions results in four different flange width of space frame to make a comparative analysis, in which Place board on the basis of the framework of the energy impact of the whole space to be a reasonable assessment.Through the above analysis, the paper concluded as follows:â‘ Based on the comprehensive test results and finite element simulation based on the results, combined with theoretical calculations to the conclusion we put forward a more reasonable structure to consider the role of cast plate consumption of the new method. Cast plate frame beam greatly enhanced the capacity of the negative moment resistance, and tension flange width to consider the following recommendations: the role of negative 1 times the ductility, it is recommended to consider both sides of 2-3 times the thickness of the effective flange width; negative 2 times the ductility in the next; proposed to consider both sides of 8 times the thickness of the effective flange width; the negative effect of 3 times the ductility, it is recommended to consider both sides of the 10-12 times the thickness of the effective flange width.â‘¡According to a study designed in this paper to consider four different flange width of the space frames under severe earthquake in the multi-wave input response analysis showed that: consider the larger flange width, the maximum layer the greater the drift. In considering the role of bi-directional earthquake, the flange width greater role on the strengthening of the larger beam, thus undermining the whole structure formed a column hinge mechanism-based "column hinge." Through comparative analysis of four space frame, you can see the whole space frame roofing board enormous impact on the energy consumption, from the most fundamentally affect the whole structure of the failure mechanism for the seismic safety of a major hidden peril, flange effects reasonable to consider the formation of the desired standard beam plastic hinge based energy agency.