超大跨度弦支子结构巨型曲面结构性能分析

发布时间：2018-03-23 15:41

本文选题：弦支子结构　切入点：巨型网格结构　出处：《辽宁工程技术大学》2014年硕士论文

【摘要】：在巨型网格结构和弦支结构的理论基础上提出了一种有杆、索、梁共同作用的新型空间杂交结构体系-弦支子结构的巨型曲面结构。这种结构是由巨型网格结构,弦支子结构及主体预应力拉索组成,文中通过有限元分析软件对结构的静动力性能进行了详细的分析。通过预应力取值原则及结构优化分析结果,建立了200m跨度的弦支子结构巨型曲面结构的计算模型。与相同参数的普通巨型网格结构进行对比分析得到该结构的节点位移与杆件应力较小,同时针对该结构的各项参数进行对比分析可知,结构跨度有一定限制,矢跨比不宜过大,桁架梁高度对静力性能影响较小,预应力在取值范围内越大,结构位移及应力越小。通过与普通网格结构的模态分析进行对比可知该结构的首阶自振频率较大,说明结构刚度较大,研究了跨度、矢跨比、桁架梁高度等参数对结构自振频率的影响。采用时程分析方法对弦支子结构的巨型曲面结构进行地震响应分析得出该结构以竖向振动为主,同时研究了参数变化对结构地震位移响应的影响并得出了部分杆件内力与节点位移的变化规律。通过对安阳某电厂干煤棚结构与该结构进行静动力特性对比分析,可知该结构在静动力特性方面比干煤棚结构要好,同时用钢量方面要比干煤棚结构节省,因此该结构形式在此类结构中具有较好的应用价值。
[Abstract]:Based on the theory of giant grid structure and chord branch structure, a new type of space hybrid structure system, chord supported substructure, is proposed, which is composed of giant grid structure, which is composed of rod, cable and beam. In this paper, the static and dynamic properties of the chord-supported sub-structure and the main body of prestressed cable are analyzed in detail by the finite element analysis software, and by the principle of prestress and the result of structural optimization analysis, the static and dynamic properties of the structure are analyzed in detail. The calculation model of giant curved surface structure with 200m span chord-supported substructure is established. Compared with the common giant grid structure with the same parameters, it is found that the node displacement and the member stress of the structure are smaller than those of the normal mega grid structure with the same parameters. At the same time, by comparing and analyzing the parameters of the structure, we can see that the span of the structure is limited, the rise-span ratio should not be too large, the height of the truss beam has little influence on the static performance, and the prestress is larger in the range of value. The smaller the displacement and stress of the structure are, the higher the natural frequency of the first order of the structure is, and the larger the stiffness of the structure is, by comparing with the modal analysis of the common grid structure, the span and the rise-span ratio of the structure are studied. The influence of truss beam height and other parameters on the natural vibration frequency of the structure is analyzed. The seismic response of the giant curved surface structure of chord-supported substructure is analyzed by time-history analysis method, and it is concluded that the structure is mainly vertical vibration. At the same time, the influence of parameter change on the seismic displacement response of the structure is studied, and the variation law of internal force and node displacement of some members is obtained. The static and dynamic characteristics of the dry coal shed structure and the structure in Anyang power plant are compared and analyzed. It is known that the structure is better in static and dynamic characteristics than that in dry coal shed structure, and the steel content is more economical than that in dry coal shed structure, so the structure form has better application value in this kind of structure.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU399

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