Research On Frame Structure Considering The Effect Of Stair With Slipper Block

Stair as building vertical evacuation routes will produce larger concentrated live loadwhile pedestrian evacuating. Especially on the whole site casting type stair bearingperformance is weaker in frame structure. One of the main reason is that the ladder plateoblique support damage in the direction along with the bench plate can accelerate thedestruction of stair related structures. In this paper, in order to provide the basis for the stairsto take part in the work structure as a whole. I build the sliding support under plate stair whichcan effectively release the ladder board direction brace effect.In this Paper, through the establishment of three models: no stairs model (namely theoverall work is not built into the staircase structure, but with stair loading), the overall sitecasting type stair model and sliding support plate stairs model, using the Pushover forstructure simulation and comparison analysis of three kinds of model calculation results, thefollowing conclusions:(1) In the ladder period of the lower plate setting sliding support, can effectively reducethe ladder board direction of diagonal brace. In structure design, the overall site casting typestair to participate in the structure of the overall work, in the building of a structural model,you must enter the stairs, increase the difficulty of modeling. Using sliding support plate stairsinvolved in structure as a whole, the stairs in the building of a structural model is not input,the calculation results with no stairs model, comparing the calculation results found that thestructure of the natural vibration period, vibration mode sequence, the base shear, interlayerdisplacement and member internal force structure such as the main parameter index of bothdifference is not big, indicate setting sliding support plate stair structure is feasible for theoverall work.(2) Diction in order to ensure the structure of the bench before entering into the plasticboard with sufficient bearing length, avoid failure. Proposed in this paper the sliding supportbearing length=stair footfall width+height displacement Angle the plastic layer. The"plastic interlayer displacement Angle" is "failure" in the structure of the maximumdisplacement Angle between the layers. For practical engineering structure, column grid sizeand high layer, the structure of the maximum displacement between layers of the "failure"Angle difference is bigger. So this paper adopts the "code for seismic design of buildingsGB50011-2010[1]of reinforced concrete frame structure proposed in this article5.5.5elastoplastic interlayer displacement Angle limit theta P=1/50as control index, calculate thebearing length is greater than the theoretical calculation results, an old-fashioned, operable.