新型張弦巨型網(wǎng)格結(jié)構(gòu)受力性能及抗震性能研究
[Abstract]:With the development of human society, higher requirements for the span of spatial structure are put forward to meet the needs of modern large-scale stadiums and stadiums. However, the single-form structure can no longer meet the needs of the super-large span. In order to improve the mechanical performance of the structure and increase the span, scientists and technicians from all over the world continue to explore and organically combine several kinds of single-form structures in order to improve the mechanical performance of the structure and increase the span. Beam string structure is a kind of long-span composite space structure which is widely used at present. It is composed of lower brace cable and upper rigid bending member. Mega-grid structure is a new type of spatial structure proposed in recent years, which consists of a large grid bearing the whole structure load and a sub-structure bearing local load. In order to further improve the span of the structure and improve the mechanical performance of the structure, the concept of Zhang string beam is introduced into the mega-grid structure in this paper, so as to form a new type of super-span spatial structure-Zhang Xian mega-grid structure, and from the cable placement scheme. The static and stability performance, dynamic characteristics and seismic performance of the structure are studied systematically. Firstly, five possible cable-bar layout schemes are proposed for the new structure, and the influence of the rise-span ratio on the deformation of different cable-laying schemes is studied. Then, the internal force and deformation of each structure under the same rise-span ratio are studied. The stability bearing capacity and instability mode are compared and analyzed synthetically, and the best cable layout scheme is selected. In this paper, the deformation, internal force, ultimate stability bearing capacity and their rate of change of the structure under the optimum scheme are analyzed by a series of parameters and compared with the same type of unarranged cable structure, and the optimum range of each parameter is given. Then a large-scale calculation is carried out for the optimum prestress of the structure under different span, rise-span ratio and truss beam height, and the optimum prestressing value range of the structure under each geometric parameter is obtained. Finally, the variation of structural stability under half-span load is discussed. In this paper, the dynamic characteristics of the structure are studied, and the dynamic characteristics of the whole structure are compared and analyzed according to whether the sub-structure is involved in the co-loading or not, taking the vibration modes of the whole structure and the corresponding natural period as the indexes. The order of appearance of the first-order modes and the corresponding periodic values are analyzed, and the variation of the stiffness with the parameters is studied in detail compared with the non-cable-laying structure. The seismic performance of structures is studied in detail, and the changes of seismic response indexes of structures under unidirectional and multidirectional earthquakes are investigated respectively. In the case of unidirectional seismic action, the seismic behavior of the structure is studied by time-range method and response spectrum method, and then the seismic performance of the structure is analyzed by parameter analysis. For multi-directional earthquakes, the effects of three-dimensional seismic action on the basic seismic performance of structures are studied firstly, and then the seismic response indexes of structures under different earthquake combinations are compared and analyzed. The optimum seismic combination is selected for the design. Finally, the parameters of the internal force and displacement of the structure are analyzed, and the reasonable range of the parameters in the seismic design of the structure is given.
【學(xué)位授予單位】:湖南大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TU399;TU352.11
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