Influence Of Stairs On Seismic Behaviour Of High Steel Structure

Through the5.12Wenchuan-Earthquake, the conceptual design of the stairs caused a revolution for the first time. For concrete stairs, national standard and atlas related calculation method and construction measures are put forward, ignoring the steel stair in the impact and role of the steel frame structure system, engineering the design basis is still in the traditional design method, as the earthquake active, the design of steel structure of the stairs also generated more controversy.Firstly, the analysis of the impact of the stairs on the supporting structure of steel frame, steel frame, steel frame core tube structure’s total structure and local structure.The analysis of total structure including period, period ratio, drift angel, drift ratio and so on. The analysis of the local structure including the oblique beam, frame beams of the stairwell, the stairwell framework columns, and so on. The influence of stairs on the lateral stiffness weaker structure is more prominent. The stairs force complex on framework structure and framework support structure. Can be ignored in the calculation of the stairs steel frame support structure and the steel framework of the core tube structure staircase oblique beam axial force in the steel framework of the core barrel.Secondly, the traditional stairs and sliding bearings stairs overall performance of the steel frame structure, mainly including the cycle layer between the steel frame structure eccentricity earthquake displacement impact analysis, staircase layout and the stairwell area ratio of the framework structure analysis. Proposed the sliding bearings form of stairs arranged form stairwell framework of beams and columns internal force amplification factor.Finally, the application of the concept of "pedestrian refuge" to the stairs conceptual design, the concept of the stairs " anti "earthquake" put the release of the " staircase effect. This concept is applied to future steel conceptual design, to achieve the seismic performance of the design requirements.