The establishment of seismic capacity evaluation system for existing RC buildings PDF Download

Author: I. C. Tsai
Publisher:
ISBN:
Category : Buildings, Reinforced concrete
Languages : zh-CN
Pages : 103

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Author: Japan Building Disaster Prevention Association
Publisher:
ISBN:
Category : Buildings, Reinforced concrete
Languages : ja
Pages : 140

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Author: fib Fédération internationale du béton
Publisher: fib Fédération internationale du béton
ISBN: 9782883940642
Category : Technology & Engineering
Languages : en
Pages : 322

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Book Description
In most parts of the developed world, the building stock and the civil infrastructure are ageing and in constant need of maintenance, repair and upgrading. Moreover, in the light of our current knowledge and of modern codes, the majority of buildings stock and other types of structures in many parts of the world are substandard and deficient. This is especially so in earthquake-prone regions, as, even there, seismic design of structures is relatively recent. In those regions the major part of the seismic threat to human life and property comes from old buildings. Due to the infrastructure's increasing decay, frequently combined with the need for structural upgrading to meet more stringent design requirements (especially against seismic loads), structural retrofitting is becoming more and more important and receives today considerable emphasis throughout the world. In response to this need, a major part of the fib Model Code 2005, currently under development, is being devoted to structural conservation and maintenance. More importantly, in recognition of the importance of the seismic threat arising from existing substandard buildings, the first standards for structural upgrading to be promoted by the international engineering community and by regulatory authorities alike are for seismic rehabilitation of buildings. This is the case, for example, of Part 3: Strengthening and Repair of Buildings of Eurocode 8 (i. e. of the draft European Standard for earthquake-resistant design), and which is the only one among the current (2003) set of 58 Eurocodes attempting to address the problem of structural upgrading. It is also the case of the recent (2001) ASCE draft standard on Seismic evaluation of existing buildings and of the 1996 Law for promotion of seismic strengthening of existing reinforced concrete structures in Japan. As noted in Chapter 1 of this Bulletin, fib - as CEB and FIP did before - has placed considerable emphasis on assessment and rehabilitation of existing structures. The present Bulletin is a culmination of this effort in the special but very important field of seismic assessment and rehabilitation. It has been elaborated over a period of 4 years by Task Group 7.1 Assessment and retrofit of existing structures of fib Commission 7 Seismic design, a truly international team of experts, representing the expertise and experience of all the important seismic regions of the world. In the course of its work the team had six plenary two-day meetings: in January 1999 in Pavia, Italy; in August 1999 in Raleigh, North Carolina; in February 2000 in Queenstown, New Zealand; in July 2000 in Patras, Greece; in March 2001 in Lausanne, Switzerland; and in August 2001 in Seattle, Washington. In October 2002 the final draft of the Bulletin was presented to public during the 1st fib Congress in Osaka. It was also there that it was approved by fib Commission 7 Seismic Design. The contents is structured into main chapters as follows: 1 Introduction - 2 Performance objectives and system considerations - 3 Review of seismic assessment procedures - 4 Strength and deformation capacity of non-seismically detailed components - 5 Seismic retrofitting techniques - 6 Probabilistic concepts and methods - 7 Case studies

Author: I-Chau Tsai
Publisher:
ISBN:
Category : Buildings, Reinforced concrete
Languages : zh-CN
Pages : 95

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Author: I-Chau Tsai
Publisher:
ISBN:
Category : Buildings, Reinforced concrete
Languages : zh-CN
Pages : 44

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Book Description

Author: Japan Building Disaster Prevention Association
Publisher:
ISBN:
Category : Buildings, Reinforced concrete
Languages : ja
Pages : 212

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Book Description

Author: Suman Sapkota
Publisher:
ISBN:
Category : Earthquake hazard analysis
Languages : en
Pages : 107

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Book Description
The structures which seem to be strong, may collapse during an earthquake. This was the case of the Pyne Gould Corporation building in New Zealand, which collapsed during the February 22, 2011, earthquake. Its collapse raised questions about the performance of the structure under seismic loading. The seismic performance evaluation of the nonlinear static analysis, or the pushover analysis, is the first choice due to its simplicity. The evaluation assumes that the structure vibrates in the first or lower mode of the vibration during a seismic event. The idealization of a multiple degree of freedom (MDOF) system to an equivalent single degree of freedom (SDOF) is the basic concept of pushover analysis. Despite these underlying assumptions, it has led to the excellent prediction of the seismic response of the multiple degrees of freedom system; which is the reason for the popularity of the pushover analysis. In this study, the pushover analysis of two multi-storied buildings in New Zealand has been done. The first building is the typical residential building, while the other is the mixed-used office building, the Pyne Gould Corporation building (PGC). The nonlinear response of the RCC buildings using the finite element analysis programs SAP2000 and ETABS under the loading has been carried out with the objective to investigate the behavior of the building. The global behavior of the structure is analyzed using the performance point of the structure while the careful analysis of the plastic hinge formation depicts the real behavior of the structure and its elements. Through pushover analysis, potential weak areas are identified with the examination of hinge state at the different steps. The application of the pushover analysis helped to verify the weak elements in the building which were the cause of the buildings collapse. The method can be implemented to understand the structural behavior of the structural members after some damage so that the designer is able to make use of the structural behavior when it receives damage to avoid total collapse.

Author: I-Chau Tsai
Publisher:
ISBN:
Category : Buildings, Reinforced concrete
Languages : zh-CN
Pages : 66

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Author: American Society of Civil Engineers
Publisher: Amer Society of Civil Engineers
ISBN: 9780784406700
Category : Technology & Engineering
Languages : en
Pages : 446

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Book Description
Provides a three-tiered process for seismic evaluation of existing buildings in any level of seismicity. This standard is intended to serve as a nationally applicable tool for design professionals, code officials, and building owners looking to seismically evaluate existing buildings. It considers various aspects of building performance.

Author: fib Fédération internationale du béton
Publisher: fib Fédération internationale du béton
ISBN: 9782883940659
Category : Technology & Engineering
Languages : en
Pages : 206

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Book Description
A brief summary of the history of seismic design as given in chapter 1, indicates that initially design was purely based on strength or force considerations. When the importance of displacement, however, became better appreciated, it was attempted to modify the existing force-based approach in order to include considerations of displacement, rather than to totally reconsider the procedure on a more rational basis. In the last decade, then, several researchers started pointing out this inconsistency, proposing displacement-based approaches for earthquake engineering evaluation and design, with the aim of providing improved reliability in the engineering process by more directly relating computed response and expected structural performance. The main objective of this report is to summarize, critically review and compare the displacement - based approaches proposed in the literature, thus favouring code implementation and practical use of rational and reliable methods. Chapter 2 Seismic performance and design objectives of this report introduces concepts of performance levels, seismic hazard representation, and the coupling of performance and hazard to define performance objectives. In fact, for displacement analysis to be relevant in the context of performance-based design, the structural engineer must select appropriate performance levels and seismic loadings. A critical review of some engineering limit states appropriate to the different performance levels is therefore proposed. In chapter 3 Conceptual basis for displacement-based earthquake resistant design, the fundamental principles associated with displacement of the ground during an earthquake and the effects, in terms of displacement, in the structure, are reviewed. The historical development guides the presentation with a review of general linear and nonlinear structural dynamics principles, general approaches to estimate displacement, for both ground and structure, and finally a general presentation of the means to measure and judge the appropriateness of the displacements of the structure in section. Chapter 4 Approaches and procedures for displacement-based design can be somehow considered the fundamental part of the report, since a critical summary of the displacement - based approaches proposed by different researchers is presented there. Displacement - based design may require specific characterization of the input ground motion, a topic addressed in Chapter 5 Seismic input. In general, various pertinent definitions of input motion for non-code format analysis are included, while peak ground parameters necessary for code base shear equations are only addressed as needed for the definition of motion for analysis. Chapter 6 Displacement capacity of members and systems addresses the fundamental problem of evaluating the inelastic displacement capacity of reinforced concrete members and realistic values of their effective cracked stiffness at yielding, including effects of shear and inclined cracking, anchorage slip, bar buckling and of load cycling. In Chapter 7 Application and evaluation of displacement-based approaches, some of the many different displacement based design procedures briefly introduced in Chapter 4 are applied to various case studies, identifying and discussing the difficulties a designer may encounter when trying to use displacement based design. Results for five different case studies designed in accordance with eight different displacement based design methods are presented. Although in general case studies are considered a useful but marginal part of a state of the art document, in this case it has to be noted that chapter 7 is possibly the most innovative and fundamental part of the whole report. The conclusions of chapter 7 are the fundamental and essential conclusions of the document and allow foreseeing a bright future for displacement - based design approaches. The state-of-art report has been elaborated over a period of 4 years by Task Group 7.2 Displacement-based design and assessment of fib Commission 7Seismic design, a truly international team of experts, representing the expertise and experience of all the important seismic regions of the world. In October 2002 the final draft of the Bulletin was presented to the public during the 1st fibCongress in Osaka. It was also there that it was approved by fib Commission 7Seismic Design.