Dissertation > Excellent graduate degree dissertation topics show

Finite Element Analysis of the Beam-Column Joint of Steel Structure in Considering Temperature Influence

Author: LiangYan
Tutor: LiJun
School: Qingdao Technological University
Course: Structural Engineering
Keywords: Welding combination of beam-column joints Scallop Welding residual stress Thermal analysis
CLC: TU391
Type: Master's thesis
Year: 2009
Downloads: 37
Quote: 0
Read: Download Dissertation

Abstract

With the rapid development of the construction industry, steel structures have been widely used in the building structure. The analysis showed that the destruction of a large number of seismic steel frame welded beam-column connection node destruction, the form of the damage and destruction of nature node detailed structure is closely related to the Northridge earthquake and the Japanese Hanshin earthquake, earthquake Record. The scallop structure is a stress concentration causes of, is also a factor affecting weld quality, it is necessary to conduct a rigorous computational analysis and experimental studies. Residual stress in this study on the basis of existing test, by means of finite element software ANSYS, no scallop combination welding steel beams and loaded both cases the stress and strain distributions were compared. First, according to the selected structure model, based on the specifications define the correct thermophysical parameters and mechanical performance parameters; Before ANSYS finite element calculation then select the appropriate unit in the form and structure model rational division of the grid. First subjected to thermal analysis, using the indirect method of thermal - structure coupled to give the model the temperature distribution; then re-enter the pre-treatment, the heating unit is converted to the corresponding structural units, and will be obtained by thermal analysis of the temperature as a temperature load is applied directly to the structural model on subsequent calculations. Computing ideas as follows: first ANSYS provides the use of cell life and death, in the thermal analysis during phasing is applied in the temperature load of the unit of the beam-column connections of the weld in order to simulate the welding seam after the cooling process, and the chamfer on the welding combination of steel beam temperature distribution; through structural analysis to calculate the residual stress, and then get Cutaway COMPOSITE STEEL of welding residual stress; then, on the model of the residual stress distribution, load calculation, resulting in residual stress on structure, as well as different Cutaway form of impact on the carrying capacity of the combined steel girder. COMPOSITE STEEL ANSYS software, no scallop welding, thermal analysis and structural analysis, the following conclusions: (1) thermal analysis results show that, with Cutaway steel beam weld heat-affected have been alleviated, without cutting angle steel beams so that the temperature because the connection is more concentrated; (2) structural stress analysis results show that the the welded the Cutaway structure of welding residual stress distribution of steel beams have a certain impact. Cutaway model of larger junction temperature is not easy to spread in the beams and columns, the stress values; Cutaway model, due to the presence of the cutting angle, the temperature field distribution in the beam-column connections more evenly so that the residual stress here difficult to excessive concentration of stress values ??than Cutaway model stress values; (3) in a cycle of repeated displacement load is applied, the the scallop structure of the beam deformation capacity certain, will cause the beam-column joints cut angular regions of concentrated deformation, resulting in brittle fracture of the beam flange scallop endpoint as a starting point, the penetration weld fracture and various parts of destruction; (4) the scallop pillars form of welded joints in the cycle repeated displacement load under the free edge of the beam flange or deformation centralized and web connection at loads less prone to strain mutation, large deformation capacity of the nodes, but prone to brittle failure.

Related Dissertations

CLC: > Industrial Technology > Building Science > Building structure > Metal structures > Steel
© 2012 www.DissertationTopic.Net Mobile