Analysis And Research Of Influence Factors On The Structural Behavior Of Reinforced Concrete Spiral Stairs

As interlayer transport facilities,reinforced concrete spiral stairs was widely used because of its advantages,such as beautiful shape,saving space,low cost etc..So the research on spiral staircase became more than before.But as a three dimensional spatial plate and shell structure,reinforced concrete plate spiral stairs has complicated mechanical behaviors.In the traditional design and calculation,we often ignore the influence of the plate width and simplify it as a three dimensional spatial curved beam which rises along the central axis,this would cause some deviation between the calculated results and the actual force of spiral stairs.At the same time,the bearing stiffness has large stiffness influence on mechanical performance of the spiral staircase,however,the spiral staircase bearing stiffness was often seen as the fixed support,it was different from the fact.So the research of width and bearing stiffness on the structural behavior of reinforced concrete spiral stairs has a certain theoretical significance.On the basis of the existing finite element theory,combined with the engineering example,this paper analyzed the influence of width and bearing stiffness on the structural behavior of reinforced concrete spiral stairs.First of all,getting related testing data through field loading tests on actual project.Establishing the relevant finite element model with ABAQUS software,and extracting the simulation results and compared with the test data,in order to verify the rationality of the finite element model.Secondly,analysis the stairs change rules of internal force and displacement by changing the spiral staircase of bearing stiffness and width.The analysis results show that the ladder plate width on the spiral staircase had a greater influence on the internal force and displacement,stair internal force and displacement are increased with the increase of ladder plate width,and at the same spiral stairs the inside displacement is larger than the outside displacement obviously.Spiral staircase internal force and displacement is sensitive to the change of the bearing stiffness,the stairs of the internal force and displacement under the condition of fixed bearing is less than the hinge supporting or half hinge.The conclusion can provide theoretical reference for the subsequent theoretical research and practical engineering design.