Analysis And Research On Multi-ribbed Slab With Light Fram Structure's Non-linear Earthquake Response

In accordence with the demands of modern industry, the development of all kinds of new-style structure with high performance enjoys people's great attaction. It has been a development trend of current architectural construction to reduce the buildiing's sole weight, improve its antiseismic capabilities , enhance its insulating and energy-saving effect and simplify the constructon method. To construct a rational mechanical model for analysis is of vital importance to completing and popularizing its theoretical system. Based on the early research result about the force mechanism and seismic behavior of the multi-rib wall which is the main force-bearing component of multi-ribbed slab with light fram structure, this paper studies this structure's seismic behavior by constructing space finite element analysis model.Firstly, based on the theory of beam-shell simplified conputation model of multi-rib wall, this paper has built space finite element model of multi-ribbed slab with light fram structure, assumped infinite stiffness in the plane of slab and made model analysis in the beam-shell structure model by using ANSYS software and then to find the calculated values are in excellent agreement with the test values by comparing the analysis results with test results.Then, by means of dynamic time-history analysis method, this paper made a Elasto-plastic seismic response analysis in beam-shell structure model by imputing seismic wave with same intensity and different frequency. In the course of the analysis, gravity second-order effects, namely P - A effect, was considered, whose infuence to structure displacement and stiffness was analyzed by using continous solution and the seismic behavior as well as feature of multi-ribbed slab with light fram structure were studied. And then, the following conclusions can be drawn through the calculation results: with the degradaton of structure stiffness, P-â–³effect is increasing constantly. With the yielding of the structure and hte increasing of the structure layers, the P - A effect become more and more obvious.Finally, in this paper, the seismic response analysis was made in multi-ribbed slab with light fram structure and in its each layer under the combined action of vertical and horizontal earthquake. Then, this paper put forward design methods of vertical seismic.