大跨度管桁架结构弹塑性时程分析

发布时间：2018-06-10 10:48

本文选题：大跨度管桁架结构 + 罕遇地震　；参考：《湖南大学》2015年硕士论文

【摘要】：大跨度空间结构的发展已成为衡量一个国家建筑科学技术水平的重要标志之一。与平面结构体系相比,大跨度空间结构具有受力合理、自重轻、抗震性能好、工期短等优点且结构形式丰富多样,具有很强的艺术表现力。对位于地震区的大跨度结构,跨度的增大和结构形式的复杂化必然会带来一些不利因素,一旦倒塌,后果严重,因此对其进行抗震性能的研究具有重大意义。通过对结构进行大震弹塑性时程分析,掌握结构在遭受强烈地震作用时的受力与变形情况,找出结构的薄弱环节,以采取适当的抗震措施,防止出现关键构件失效引起的倒塌。本文以某实际工程中的大跨度钢管桁架结构为研究对象,对该建筑进行了8度罕遇地震下的抗震性能研究。具体如下:(1)对体育馆屋盖钢管桁架结构在大震作用下的非线性性能给出定量解答,研究大跨度钢管桁架结构在罕遇地震作用下的变形形态、构件的塑性及损伤情况,以及整体结构的弹塑性行为,具体的研究指标包括最大跨中位移(挠跨比)、悬挑端最大位移(挠跨比)及最大支座反力等;(2)给出管桁架结构构件的塑性发展过程,描述各构件出现塑性铰的先后次序,分析结构的屈服机制并对其合理性作出评价;(3)研究结构关键部位、关键构件的变形形态和破坏情况,重点考察的部位主要包括但不限于下列部位:结构的加强区、结构支座及其相邻各1~2区格的范围、结构的悬挑根部等;(4)论证整体结构在设计大震作用下的抗震性能,寻找结构的薄弱层或(和)薄弱部位;(5)根据以上研究成果,对结构的抗震性能给出评价,并对结构设计提出改进意见和建议。
[Abstract]:The development of large span spatial structure has become one of the important signs to measure the level of science and technology of a country. Compared with the plane structure system, the large span spatial structure has the advantages of reasonable force, light weight, good seismic performance, short time limit, rich and diverse structure forms, and strong artistic expressiveness. The span structure, the enlargement of the span and the complexity of the structure form will inevitably bring some unfavorable factors. Once the collapse, the consequences are serious. Therefore, it is of great significance to study the seismic performance of the structure. The weak link of the structure is to take appropriate seismic measures to prevent the collapse of the key member failure. In this paper, the long-span steel tube truss structure in a practical project is taken as the research object, and the seismic performance of the building under the 8 degree rare earthquake is studied. (1) the structure of the steel tube truss of the gymnasium is in large earthquake action. The nonlinear properties of the large span steel tube truss structure under the rare earthquake, the plasticity and damage of the member, and the elastoplastic behavior of the whole structure are studied. The specific indexes include the maximum span displacement (torsion span ratio), the maximum displacement of the cantilever end and the maximum support reaction, etc. (2) The plastic development process of the pipe truss structural members is given, the sequence of the plastic hinge is described, the yield mechanism of the structure is analyzed and its rationality is evaluated. (3) the key parts of the structure, the deformation form and failure of the key components are studied. The main part of the study is not limited to the following parts: the strengthening of the structure. The area, the structure support and its adjacent 1~2 area range, the cantilever root of the structure and so on; (4) to demonstrate the seismic performance of the whole structure under the design of large earthquake, find the weak layer or (and) weak part of the structure; (5) to evaluate the seismic resistance of the structure according to the above research results, and to improve the structural design and suggestion.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU392.3

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