The Building Stairs Of Aseismic Design Of Impact Study

Whether the public buildings or civil building, stair as the only escape passage is very important. Especially in an earthquake or a fire, stair is important emergency escape vertical channels. The evacuation of people make a dense live load distribution in the stairwell and stair section, these are relatively weak in architectural place. At this time, the destruction of the stairs will escape and rescue time delay, never do more casualties.In the Wenchuan earthquake, stair components were severely damaged. After the earthquake in yushu, stair question once again become the focus of attention. The stairs are the main channels for vertical contact buildings, its importance is self-evident. As part of the overall structure, the structure will inevitably impact on the overall dynamic performance, structural changes in the overall dynamic performance inevitably affect the safety of the stairs. However, in the seismic data in the previous inspection has found that a lot of stairs before the damage ahead of the main structure, as the evacuation, as the role of escape stairs, but not in the face of natural disasters to play its due role in people’s lives and property on not guaranteed, so the structure must be designed to use the building features and personal safety into account reasonable.This paper consider two aspects, From finite element theory, combined with seismic aspects of the basic knowledge to build a series of reinforced concrete frame structure model. These models, including through the stairs and the stairs are not included, the location of the staircase layout, have done a number of changes, the final large-scale finite element analysis software ETABS of the model in a multi-event and rare earthquake simulation analysis.In the past in the structural design of general is stair the part of the load into equivalent load applied to peripheral components, ladder board, flat bedplate and ladder column is calculated separately for the component such, did not consider the stairs in the whole structure analysis and calculation on the structural component on the stairs of the seismic performance impact is not very clear. Previous stair the simplified as part of equivalent load method that we now existing in the design of a security risk. The stairs are important escape passage, stair failure means escape passage truncated.5.12earthquake in a lot of stairs in the component under the action of repeated failure happens, lead to escape personnel cannot escape smoothly, lost precious life. In the earthquake, stair around the influence of the component to basically have two kinds of reflected, a kind of for stair well overall destruction, and the other for the stairs JiaoZhu shear destruction. For the structure design staff, we have a responsibility to from disaster sum up experience, and applied to the design of later.This paper mainly working content:The contrast frame structure with the included in not included in the stairs, in general structure under the action of earthquake force characteristic and dynamic response, and the structure of the components of internal force of the change.Analysis of the position and number in the change of the whole structure influence what will happen.By contrast analysis of internal forces, highlighting the stairs on the overall seismic performance of the importance of improving the seismic performance of the stairs, and stair components of reinforced concrete frame structure made earthquake-resistant design proposals to ensure the safety of people’s lives and property, for future research provide some theoretical support.Meet the "small earthquake is not bad, the shock can repair, earthquake not fall" requirements, to serve as a reliable means of escape stairs intended purpose.