塑性鉸外移型鋼管混凝土柱-鋼梁節(jié)點(diǎn)的力學(xué)性能研究
[Abstract]:When the plastic hinge of Liang Zhu joint is moved out to the beam, it can effectively protect the joint from brittle failure. According to the experimental research and theoretical analysis of scholars at home and abroad, it is found that there are two main methods to realize the plastic hinge displacement, that is, the beam end is weakened or the beam end is strengthened. Based on this idea, the mechanical properties of plastic hinged concrete filled steel tubular column-steel beam inner partition joints are studied by using ABAQUS finite element software. The main work of this paper includes the following aspects: (1) on the basis of reading a large number of related literature, a certain modeling method is used to simulate the relevant node test, and the finite element simulation results are compared with the experimental results. The rationality of the modeling method is verified. Referring to the relevant specifications, a common concrete-filled steel tubular column-steel beam joint is designed. The model of the joint is established by using the calibrated modeling method, and the vertical antisymmetric monotonic and reciprocating displacement loads are applied to the end of the beam, respectively. The mechanical properties of joints under two loads are analyzed. (2) three kinds of plastic hinge joints are obtained by weakening the flange at the end of the beam, expanding the flange directly and strengthening the flange side plate. Using the same modeling method, the finite element simulation of three plastic hinge joints under the same load conditions is carried out, and the mechanical properties of the joints are analyzed. Finally, according to the simulation results, the reasonable design dimensions of three kinds of plastic joints are discussed and given, which provides a reference for practical engineering design. (3) in view of the influence of the combination effect of floor on the mechanical properties of the plastic hinged concrete filled steel tubular joints, according to the relevant data, the reasonable floor is designed and assembled into composite beam joints with the common concrete-filled steel tubular column-steel beam joints mentioned above. The same boundary condition and loading mode are used to apply monotone displacement load to the composite beam joint, and the difference and similarities between the loading results and the steel beam joint are compared. Then the joint of the composite beam is designed with the same plastic hinge, and the mechanical properties of the modified joint under monotone displacement load are studied.
【學(xué)位授予單位】:蘭州理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2013
【分類號(hào)】:TU398.9
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