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Theoretical Study on Dynamic Stability and Collapse Prevention Design of Single-Story Steel Frames

Author: LiuYingChun
Tutor: ZhangWenFu
School: Daqing Petroleum Institute
Course: Disaster Prevention and Reduction Engineering and Protective Engineering
Keywords: Steel frame Dynamical stability Earthquake P-Δ effect Nonlinear Finite Element Method Displacement limit Anti collapse design
CLC: TU391
Type: Master's thesis
Year: 2005
Downloads: 234
Quote: 5
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Abstract


The steel frame structure because of its high strength, ductility, toughness, light weight, good seismic performance advantages, to be more widely used in practical engineering. The importance of the steel frame structure with engineering to promote the progress of theoretical and experimental research. At present, the steel frame of the static stability theory and design methods have been perfecting the dynamic stability of the steel framework also theoretical research has not yet to fully develop. Therefore, the dynamic stability of the framework and the establishment of \Of this article is was mainly yes right to the conduct a study to the in the the the column cross-section in the different earthquake the role of under the the for the the the dynamic stability of of the the the steel the framework of of the of a square the of the two types of single-layer of of the and workers glyph, and mainly contains the the the following a few part of the study of the contents of: the - Part 1. In accordance with the the the different the axial compression ratio of and the the long slenderness ratio 12 column section were designed for square monolayer steel framework and a 12-column section-shaped single-layer steel frame, given the overall size and specifications of the single-layer steel frame system ANSYS finite element analysis modeling data. Single-layer steel framework structure simplifies static equivalence principle into semi-column model, demonstrated a half-column top displacement of half of the frame displacement and established a single-layer steel framework and its half-column model based on the design size. Also, the finite element method using ANSYS nonlinear static analysis of single-layer steel frame and half-column model, to verify the correctness of the proposed simplified model. Part 2. Using NONLIN Software stability analysis of a single layer of steel frame under different earthquake, the the structure considering P-Δ effect of dynamic instability seismic wave peak threshold for the next step using the finite element method The dynamical stability analysis of to to provide the the peak value of data of the the can be learn from of the earthquake wave. ANSYS transient dynamics analysis method and APDL parametric design language application threshold peak, according to the analysis of the seismic waves NONLIN software, adjust the dynamic analysis of seismic wave data applications APDL language prepared three types of seismic waves in ANSYS input command stream. Stability analysis by 12-column section square framework of large-scale power found in the framework of stable and unstable displacement curves of different seismic waves, phase plane curves, hysteresis curve, and energy The time course curve has the consistency and ultimate displacement when instability was close. Thus, the role of different seismic waves have little effect on the dynamic stability of the framework structure of the conclusion that the ultimate displacement of the frame structure has nothing to do with the type of seismic loading imposed come. Part 3 column-shaped cross-section of the single-layer steel frame using ANSYS finite element analysis software static stability, found that the level of force - displacement skeleton curve using the the correction stiffness and cross-section plastic moment theoretical calculations skeleton curve The agreement further evidence of the bilinear level of force and displacement curve of the relationship between the actual skeleton of the frame structure curve consistent. Column section under different earthquake workers shaped the framework of dynamic stability analysis, reached the same conclusion with the second part of that framework column section either square or work shaped framework, the Dynamic Stability It has nothing to do with the type of seismic loading imposed. Part 4. Firstly, according to the results of the analysis of the first few chapters, summed control parameters on the dynamic stability of the framework, given the instability of the framework, the seismic wave peak slenderness ratio and axial compression ratio curve, to determine the structure Buckling of the range of variation of the seismic wave peak. Then, we discuss several methods to determine the ultimate displacement and combined with our seismic codes and engineering require the ultimate displacement, from the perspective of structural deformation, the single-layer steel frame with anti-collapse in the actual project design recommendations. Reference framework seismic design basis.

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