吊脚框架结构抗震性能分析及抗震设计建议

发布时间：2018-01-24 15:26

本文关键词： 吊脚框架结构刚度比动力特性抗震性能抗震设计　出处：《重庆大学》2016年硕士论文　论文类型：学位论文

【摘要】：为了更有效地利用山地资源,同时缓解人口日益增长所带来的住房压力,推动社会经济的发展,吊脚建筑结构作为一种常见的山地建筑结构形式在我国诸多山地城市应运而生。5.12汶川大地震中吊脚建筑结构的特殊震害暴露出该类结构的设计缺陷,加之目前学术界和工程界对山地建筑结构的研究成果主要集中于掉层结构,但吊脚结构特殊抗震问题研究较少,理论明显滞后于工程实践,像普通结构一样按现行规范进行结构设计的吊脚结构是否能够满足“三水准”的抗震性能目标也犹未可知。针对以上问题,本论文采用有限元模拟的方法,对吊脚框架结构的抗震性能进行了分析,并提出初步的抗震设计建议。基于以上背景,本论文主要完成了以下工作:(1)归纳总结了目前国内外关于山地建筑结构,特别是吊脚结构的研究成果以及5.12汶川地震中吊脚建筑结构的震害特点,并实地调研了重庆地区吊脚结构的工程实例。(2)针对吊脚结构先天不规则性,提出新的抗震设计控制指标“上下刚度比”(建筑结构接地层以上部分整体侧向刚度和接地层以下吊脚部分整体侧向刚度的比值)和“层刚度比”(建筑结构接地层以上一层整体侧向刚度和接地层以下吊脚部分整体侧向刚度的比值),以探讨结构的动力特性。在此基础上,基于SAP2000和PERFORM 3D软件,对不同抗震设防烈度区、按现行规范进行弹性截面设计的吊脚框架结构进行弹性、弹塑性分析,总结该类结构的受力变形规律、耗能损伤等,用以评价该类结构在不同抗震设防烈度区的抗震性能和适用性,找出结构的抗震薄弱环节。(3)完善吊脚框架结构的抗震设计方法,给出针对于不同抗震设防烈度区该类结构特殊问题的设计建议,深入拓展工程实践中该类结构的抗震措施设计。通过以上工作,得出了以下主要结论:(1)“上下刚度比”和“层刚度比”是将宏观指标参数化、更具普适意义的综合性抗震设计控制指标,可用其值的相对大小指导结构设计。(2)按现行规范进行截面设计的6度低烈度区的吊脚框架结构在罕遇地震作用下,结构的位移、侧向刚度、剪力分布等抗震性能良好,能满足“大震不倒”的抗震性能目标。随“上下刚度比”和“层刚度比”的增大,结构构件损伤程度略有降低。(3)随着烈度的增大,在7、8度所采用的增大截面法虽然可以保证吊脚短柱(剪跨比≤2的柱)的承载力,但当结构遭遇罕遇地震作用时,会引起薄弱层的转移,特别是以最短吊脚柱为中心,周围构件损伤严重,极有可能导致上部楼层整体坍塌,最终无法满足“大震不倒”的抗震性能目标。(4)基于本论文的计算分析结果,归纳吊脚框架结构的抗震设计内容。重点提出在高烈度区:吊脚短柱适度加强;吊脚长柱(剪跨比2的柱)设置横向拉梁;接地层梁轴力不可忽略;地上一层(薄弱层)放大内力计算等抗震设计建议。本论文的创新点可归纳如下:(1)将宏观控制指标参数化,提出更具综合性和普适性的抗震设计控制指标“上下刚度比”、“层刚度比”,所推导出的简化计算公式可以从本质上反映出吊脚框架结构的刚度特性。(2)通过研究发现,吊脚框架结构顺坡向的接地层梁,越靠近最短吊脚柱,轴力越大。结构设计时应对轴力的影响加以重点考虑,不能忽略。
[Abstract]:In order to make more effective use of mountain resources, at the same time to ease the population brought by the growing pressure of housing, to promote the development of social economy, Diaojiao building structure is a common structure form in many mountain mountain city in China came into being in the Wenchuan earthquake disaster.5.12 special structures exposed hanging foot defects in the design of this kind of structure in addition, the academia and engineering research results of mountain building structure mainly focuses on structures, but at the special structure of seismic problem research, the theory lagged behind the engineering practice, like ordinary structure according to the current standard of the same structure is suspending the design can meet the seismic performance objectives of the three level "is still unknown. To solve the above problems, this paper adopts the method of finite element simulation, the seismic performance of suspending frame structures are analyzed, and A preliminary proposal for seismic design. Based on the above background, this paper mainly completed the following work: (1) summarized at home and abroad on the mountain building structure, especially the damage characteristics of suspended building structure research of suspending structure and 5.12 in the Wenchuan earthquake, and field research of suspending structure in the Chongqing area of engineering examples. (2) for suspending structure congenital irregularity, put forward the new seismic design control index on stiffness ratio (above ground part of the whole building structure lateral stiffness and the ratio of the ground below the suspending part of the whole lateral stiffness) and "layer stiffness ratio" (the ground above a layer of building structure the whole lateral stiffness ratio and the ground below the suspending part of the whole lateral stiffness), to investigate the dynamic characteristics of the structure. On this basis, SAP2000 and PERFORM 3D software based on the different seismic fortification intensity region, Suspending frame structure of elastic elastic section design according to the current specification, elastic-plastic analysis, summarize the structure of the force deformation, damage energy dissipation, is used to evaluate the structure in the seismic performance and the applicability of different seismic fortification intensity region, to find out the structure of the shock (3) to improve the weak links. The seismic design method of suspending frame structure, gives the design suggestions for seismic region of this kind of structure with different seismic fortification special problems, further expand the engineering practice of seismic measures in the design of this kind of structure. Through the above work, drew the following conclusions: (1) the upper and lower stiffness ratio and layer stiffness than "is the macroscopic index parameter, comprehensive seismic design control index has more universal significance, the value of the relative size of available guide structure design. (2) a 6 degree low intensity section according to the current standard suspending frame structure In the case of rare earthquake, the displacement of the structure, the lateral stiffness of shear distribution of good performance, can meet the goal of seismic performance of large earthquake without collapse. With the upper and lower stiffness ratio and stiffness ratio of layer ", structure damage degree decreased slightly (3). With the increase in intensity, the 7,8 of the section enlargement method can guarantee suspending short column (shear span ratio is less than 2 of the column) of the bearing capacity, but when structure suffered severe earthquake, will cause the transfer of the weak layer, especially in the shortest Diaojuezhu as the center, around the damage is serious, is likely to lead to the upper floors collapsed, eventually unable to meet the target of seismic performance earthquake does not fall". (4) the results of this paper based on the induction and seismic design of frame structure. The key of suspending in high intensity area: moderate and suspending short column; suspending (long column shear span ratio The 2 column) set the horizontal pull beam; the ground beam axial force can not be ignored; on the ground floor (Bo Ruoceng) amplification forces calculation seismic design suggestions. The innovation of this paper can be summarized as follows: (1) the macro control parameter, put forward a more comprehensive adaptability and general seismic design the control index of upper and lower stiffness ratio, the ratio of stiffness, simplify the derived calculation formula can reflect the stiffness characteristics of suspending frame structure from nature. (2) through the study found that the suspending frame structure along the slope of the ground beam, the closer the shortest Diaojuezhu, axial force more. Structure design to deal with the impact of axial force to focus, can not be ignored.

【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU352.11

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