“工形”芯板二階段屈服防屈曲耗能支撐性能及設(shè)計方法研究
[Abstract]:Based on the shortcoming that the large yield displacement of the existing buckling braces restricts the exertion of its energy dissipation and reduces the damage degree of the main structure, a new type of anti-buckling bracing is proposed in this paper. That is, the "I-shaped" core plate two-stage yield buckling and energy dissipation support. The yield displacement of the "I-shaped" core plate in the second stage is small, which can yield before the crack of the reinforced concrete member (or before the steel member enters the elastic-plastic state) and dissipate a great deal of seismic energy. The damage degree of the main structure is greatly reduced and the replacement is convenient after the earthquake, the repair cost is low, and the engineering application value and economic benefit are remarkable. In this paper, the working principle and construction requirements of the two-stage buckling and energy dissipation bracing for the "I-shaped" core plate are described. The theoretical formula is derived, and the relevant parameters are studied by using the finite element software ABAQUS. The engineering design method of support is summarized and the design example is given. The main contents are as follows: (1) based on the existing research results, the formulas related to the mechanical properties of the two-stage buckling and energy-dissipation bracing of the "I-shaped" core plate are summarized and deduced, including the bearing capacity and displacement calculation of the braces. The stability calculation of connection section, energy dissipation section and restraint element, the calculation of supporting cross section area of each segment of the core, the length of each component and the wall thickness of the constraint element, (2) the model is designed according to the theoretical formula, and the initial geometric defects, friction, clearance, width to thickness ratio, constraint ratio and aspect ratio are analyzed by the finite element software ABAQUS. According to the results of parameter analysis, the theoretical formula is verified and improved. (3) the derivation of theoretical formula, finite element analysis and related literature research results are summarized and combed, including the applicable range of two-stage buckling and energy dissipation braces for "I-shaped" core panels. Layout principles, deformation requirements, design process, engineering design steps, construction and related requirements, etc. Finally, a design example is given.
【學位授予單位】:長安大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TU317
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