Research On The Stressing State And Failure Criterion Of Space Steel Frame

Steel frame structure is widely used in the world because of its advantages of clear transmission mechanism and flexible space arrangement.At present,there are three kinds of failure criterion of frame structure: forming a variable system,structural deformation exceeding limit and the bearing capacity occurrence significant drop.The above failure criterion which are based on different theoretical basis obtain different failure load,and the definition of failure is not the same.For a long time,the failure criterion has been lack of uniformity.This paper is based on energy to analysis the stressing state of the space steel frame.Combined with the numerical simulation results,propose the failure criterion and predict the failure load,and then verify the rationality of the failure criterion.At the same time,this paper attempts to describe the stress situation and the ability to work together of structure with energy.The main contents are as follows:Firstly,describe the basic concepts related to the stressing state analysis theory of structure in details.Through theoretical deduction,the feasibility of SEND as the stressing state parameter of structural is analyzed.Based on the numerical simulation results,analysis the rationality of stressing state parameters by slope method,and then introduces the Mann-kendall method for seeking the characteristic point of the stressing state.Secondly,analysis the test data of space steel frame with no floor based on SEND,according to curve feature point and the change of stressing mode propose failure criterion and method of predicting failure load.And then verify the rationality of the failure criterion.Through SEND distribution mode,analysis on the local stress of the structure.Combined with the numerical simulation results,reveal the participation and work together ability of each part in the process of force.