半剛性節(jié)點(diǎn)圓柱面巨型網(wǎng)格結(jié)構(gòu)力學(xué)性能研究
[Abstract]:Strictly speaking, most of the node connections used in spatial structure are semi-rigid joints between complete rigid connection and ideal hinged joint. At present, some achievements have been made in the research of conventional reticulated shells of semi-rigid joints at home and abroad, but for mega-grid structure, which is a new spatial long-span structure in China, the current research mainly focuses on mechanical properties and calculation methods. Optimization analysis and seismic research, and in these studies, the joint connection is treated as the joint, and the semi-rigidity of the actual joint connection is not taken into account. In this paper, the mechanical properties of semi-rigid joint cylindrical mega-grid structure are studied from the point of view of joint stiffness. Using Ansys finite element analysis software as a tool, the numerical model of semi-rigid joint cylindrical mega-grid structure is established, and the correctness of the model is verified. The effects of axial stiffness and bending stiffness of different orders of magnitude on the static stability of the structure are studied respectively, and it is inferred that the superposition of the two may have a greater effect on the static stability of the structure. Therefore, the existing stiffness constitutive model of welded ball joint is used for reference, and the continuous approximate calculation method suitable for the constitutive model is put forward considering the superposition effect of the two models. The suitable welding ball specification of the structure is selected, and the static stability bearing capacity of the structure under the condition of uniform load with full span and uniform load with half span is calculated respectively. According to the internal force distribution of the bar under ultimate load, the failure conditions of the structure are obtained, and the static analysis of the welded ball semi-rigid joint structure is carried out. Finally, the natural vibration characteristics and seismic response of welded ball semi-rigid joint structure and different number of axial semi-rigid joint structures are analyzed. The results show that with the increase of the axial stiffness of the joint, the static stability bearing capacity of the structure increases significantly, and the bending stiffness has little effect, and the superposition effect of the two is significant. Under the static condition, the structural failure is controlled by the strength condition in most cases, and the elastoplasticity of the material should be considered in the structural design. In the static calculation, with the decrease of the stiffness of the welded ball semi-rigid joint, the internal force of the chord of the structure increases significantly, which can not be ignored in the design. The suitable stiffness range of welded ball joints has little effect on the natural vibration characteristics and dynamic response of the structure, and the axial stiffness of different orders of magnitude has a significant effect on the dynamic analysis of the structure.
【學(xué)位授予單位】:西安建筑科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TU399;TU311.3
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