高层钢结构弹塑性抗震分析静动力综合法

现有的高层建筑结构罕遇地震分析方法可以归结为两大类,弹塑性动力时程分析方法和静力弹塑性分析方法。这两类方法各有其优点和不足。将动力和静力弹塑性分析方法结合起来,发挥各自的优势是改进高层建筑结构罕遇地震分析方法的一种思路。本文提出了一种可以应用于高阶振型和扭转效应不可忽略的高层钢结构罕遇地震分析方法———静动力综合法。该方法结合了动力弹塑性时程分析、高层建筑结构等效弹塑性层模型和静力推覆分析方法的优点。通过算例分析验证了静动力综合法的合理性和适用性,以及静力弹塑性分析方法在三维非对称结构中应用的可行性。     

复杂高层建筑结构抗震分析方法简介

简要介绍了复杂高层建筑结构包含的内容,结合近现代抗震设计理论体系,对底部剪力法、反应谱方法、时程分析方法、静力弹塑性分析方法、增量动力分析方法五种复杂高层建筑结构抗震分析方法作了比较,得出了一些有实用价值的结论。     

静力弹塑性分析方法的修正及其在抗震设计中的应用

介绍了静力弹塑性分析的基本原理和主要计算步骤,在此基础上提出了高层建筑结构中能力谱的修正方法,并进一步讨论了侧向荷载分布形式对结构能力谱的影响,在大震作用下角边柱出现拉力,附加阻尼对结构需求谱的折减等问题。对某超B级高层建筑结构进行静力弹塑性分析,对其抗震性能做出了评估。     

我国高层建筑抗震设计的若干问题

回顾与分析了我国高层建筑的发展;讨论了我国高层建筑结构抗震设计的几个问题：材料与结构体系,构件变形能力与轴压比,弹塑性时程分析与弹塑性静力分析,以及基于位移的抗震设计。     

型钢混凝土框架—混凝土核心筒结构抗震性能分析

采用Etabs软件,以某型钢混凝土框架-混凝土核心筒结构为研究对象,建立整体空间有限元模型进行模态、振型分解反应谱法及弹性时程分析;并采用midas/gen软件对该高层结构进行设防烈度及罕遇地震下的静力弹塑性时程分析。分析该建筑结构在多遇及罕遇地震作用下的地震反应,并验算了该高层建筑在多遇地震下的弹性变形及罕遇地震作用下结构的弹塑性变形。结果表明该结构满足抗震规范要求。     

高层建筑结构静力弹塑性分析方法的研究改进

主要就目前高层建筑结构弹塑性分析方法的研究现状进行了探讨,介绍了高层建筑结构静力弹塑性分析方法的计算软件,提出了静力弹塑性分析方法的改进意见,以推广Pushover分析方法的应用,从而促进高层建筑结构的发展。     

静力弹塑性分析在唐山第三空间综合体工程结构抗震优化设计中的应用

利用静力弹塑性分析对拟建结构进行抗震性能设计,分析结构在地震作用下从构件到结构多层面的弹塑性性能,方法概念清楚,实施相对简单。以一框架-剪力墙高层建筑为例,利用SAP2000软件对结构进行静力弹塑性分析,评估结构的抗震性能,考察结构方案的合理性、经济性,重点关注转换构件、错层柱、底部剪力墙、连梁等关键部位的塑性发展情况,为结构设计优化提供依据。     

广西中医学院图书馆结构抗震设计

广西中医学院图书馆大楼属于特殊不规则的连体超限高层建筑.通过振型分解反应谱法、结构弹性时程分析以及在罕遇地震作用下的静力弹塑性分析,对该工程的结构抗震性能进行了评估.采用合理的结构布置、有针对性地增加水平构件水平刚度等多项措施,保证结构的安全可靠.计算结果表明,结构的各项性能指标均满足现行规范要求,所采取的技术措施是合...     

某超限高层住宅结构抗震性能设计与分析

某8度区大高宽比高层建筑,采用剪力墙结构,高度接近B级高度上限130 m,属于高度超限高层建筑。通过对结构进行多遇地震下的振型分解反应谱计算和弹性时程分析、设防地震与罕遇地震下的等效弹性计算、静力弹塑性分析,研究了地震作用下结构的受力特点和动力响应,同时采取加强措施,提高了结构的抗倾覆能力,结果表明结构能够满足预定的性能目标,抗震性能良好。     

某大底盘双塔连体高层结构抗震性能分析和设计

某工业研发大楼为具有两个连接体的双塔连体建筑,属于特别不规则的高层建筑结构。通过振型分解反应谱法、动力弹性时程分析以及在罕遇地震作用下的静力弹塑性Pushover分析,对该工程的结构抗震性能进行评估,考察塑性铰的发展机制,并针对薄弱部位采取相应的加强措施。     

连体结构竖向地震作用性能研究

指出双塔连体结构是在两塔楼顶部设置连体而形成的新型建筑结构形式,属于规范规定的复杂高层建筑结构,针对这一结构,采用通用有限元程序ANSYS对原型结构的抗震性能进行数值模拟分析,从而更深入地了解了此类结构在竖向地震作用下的抗震性能。     

Effect of vertical structural irregularity on seismic design of tall buildings

Many tall buildings are practically irregular as an entirely regular high‐rise building rarely exists. This study is thus devoted to assessing the approach and coefficients used in the seismic design of real‐life tall buildings with different vertical irregularity features. Five 50‐story buildings are selected and designed using finite element models and international building codes to represent the most common vertical irregularities of reinforced concrete tall buildings in regions of medium seismicity. Detailed fiber‐based simulation models are developed to assess the seismic response of the five benchmark buildings under the effect of 40 earthquake records representing far‐field and near‐source seismic scenarios. The results obtained from a large number of inelastic pushover and incremental dynamic analyses provide insights into the local and global seismic response of the reference structures and confirm the inferior local response of tall buildings with severe vertical irregularities. Due to the significant impacts of the severe irregularity types on the seismic response of tall buildings, the conservative code approach and coefficients are recommended for design. It is also concluded that although the design coefficients of buildings with moderate irregularities are adequately conservative, they can be revised to arrive at more consistent safety margins and cost‐effective designs.     

高层钢-混凝土混合结构抗震性能评估

基于性能的抗震思想是以结构的非线性静力推覆分析为基础,以结构的抗震设计方法和抗震性能评估方法为核心的抗震设计方法。将这种方法应用于混合结构的抗震性能评估中:对混合结构进行弹塑性静力推覆分析,根据地震设防水准的不同,确定不同水准地震情况下的弹塑性需求谱曲线,运用能力谱分析方法,得到混合结构在不同等级地震作用下的性能目标,对比规范的性能指标,对混合结构的抗震能力做出评估。     

Quantitative evaluation and improvement of seismic resilience of a tall frame shear wall structure

Tall buildings are an important part of a city, and their earthquake-induced damage or collapse will lead to heavy losses, extended repair time, and casualties. Therefore, it is essential to quantify and improve the resilience of tall buildings. To this end, this paper develops a component damage-based metric to characterize tall buildings' functionality loss and then proposes a general quantitative evaluation process to evaluate tall buildings' resilience. Next, the evaluation process is applied to a 42-story reinforced concrete frame shear wall building to demonstrate its applicability. Finally, retrofit strategies on nonstructural components are discussed to enhance the building's resilience. It can be concluded that the proposed metric can be effectively used to evaluate tall buildings' functionality loss. The building being studied has great seismic resilience, with resilience values of 99.95%, 98.68%, and 88.69% at service level earthquake (SLE), design level earthquake (DBE), and maximum considered earthquake (MCE), respectively. The influence of nonstructural components on seismic resilience is greater than that of structural components at SLE and DBE levels. It is an effective alternative to enhance the seismic resilience of tall buildings under SLE and DBE by improving the performance of partition walls, ceilings, and equipment.     

华润大厦超限高层的抗震性能化设计

《高层建筑混凝土结构技术规程》(JGJ 3—2010)新增加了第3.11节:结构抗震性能设计,使高层的抗震设防目标有了更进一步的深化和发展。以南宁华润大厦超限高层为工程实例,采用基于性能设计的抗震分析方法,细化了各构件在各阶段的抗震性能目标。采用多种有限元分析软件,针对超限高层详细进行了小震振型反应谱分析、中震作用下的屈服判别法分析、大震作用下的弹塑性静力推覆分析、跨多层通高柱的屈曲分析,并基于分析结果提出了该工程结构的超限抗震加强措施,保证了超限结构的安全可靠,为同类工程设计提供借鉴。     

Seismic behavior of tall buildings using steel–concrete composite columns and shear walls

For the seismic design of tall building structures, the behavior under severe earthquakes should be carefully considered and the upper limit of inter‐story deformations are often defined by the design codes. To improve the performance of structures under severe earthquakes, composite structural members, including steel reinforced column and steel plate reinforced shear wall, are often adopted. In the present work, the seismic behavior of tall buildings using steel–concrete composite columns and shear walls is investigated numerically. Fiber beam–column element models and multilayer shell models are adopted to establish the finite element model of structure, and the material nonlinearities are described by the plasticity and damage models. The accuracy of the developed models is verified by the experimental results of a single shear wall. Systematic numerical simulations are performed for the tall building structures subjected to different earthquakes. The comparative study indicates that the nonlinear redistribution of internal forces plays a very important role for the performance of tall buildings under severe earthquakes.     

地震作用下某高层结构MTMD减震控制研究

通过数值模拟研究了地震作用下高层结构多个调谐质量阻尼器(MTMD)减震控制。根据实际工程,利用国际通用软件ETABS建立了结构三维有限元模型,进行了动力特性的分析,得到了结构的前几阶频率;根据不同场地类型,选取了4条典型的地震波;研究了调谐质量阻尼器(TMD)的参数选取和有限元的模拟;运用时程分析方法,分别研究了不同地震作用下高层结构有无控制下的反应。研究结果表明,MTMD对高层结构的减震控制效果明显,场地类型对减震控制效果有一定的影响。所获得的结果为高层结构减震控制设计提供参考和依据。     

钢纤维混凝土局部增强高层建筑结构构件的研究

对钢纤维混凝土的性能和高层建筑结构设计的特点做了分析,综述了钢纤维混凝土在局部增强高层建筑结构构件的物理性能和力学性能、改善结构的整体抗震性能方面的研究和应用.     

复杂高层建筑抗震与消能减震研究进展

复杂高层建筑的震害在近来的历次地震中都有发生,其抗震分析和设计难度较大,提高其抗震性能是当前建筑抗震的难点之一。通过对近10年来国内在复杂高层建筑抗震方面的研究进行回顾和总结,重点介绍了组合剪力墙及筒体结构、钢管混凝土结构、结构模型振动台试验和三种消能减震方法。提出了采用新型高效的结构体系及高性能抗震部件或消能减震新技术改善复杂高层建筑抗震性能。这些研究工作与工程实践紧密结合,大部分研究成果已在实际工程中成功应用。图18参28     

Optimum strength distribution for seismic design of tall buildings

This paper examines the effects of strength distribution pattern on seismic response of tall buildings. It is shown that in general for an MDOF structure there exists a specific pattern for height‐wise distribution of strength and stiffness that results in a better seismic performance in comparison with all other feasible patterns. This paper presents a new optimization technique for optimum seismic design of structures. In this approach, the structural properties are modified so that inefficient material is gradually shifted from strong to weak areas of a structure. This process is continued until a state of uniform deformation is achieved. It is shown that the seismic performance of such a structure is optimal, and behaves generally better than those designed by conventional methods. The optimization algorithm is then conducted on shear building models with various dynamic characteristics subjected to a group of severe earthquakes. Based on the results, a new load pattern is proposed for seismic design of tall buildings that is a function of fundamental period of the structure and the target ductility demand. The optimization method presented in this paper could be useful in the conceptual design phase and in improving basic understanding of seismic behavior of tall buildings. Copyright © 2007 John Wiley & Sons, Ltd.