Seismic Performance of Dual Systems Composed of Fully and Partially Restrained Frames PDF Download

Author: Tara Marie Guthrie
Publisher:
ISBN:
Category : Earthquake resistant design
Languages : en
Pages : 182

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Author: Derek A. Marucci
Publisher:
ISBN:
Category :
Languages : en
Pages : 168

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Book Description
Previous earthquakes have revealed seismic performance issues associated with fully-restrained (FR) welded beam-to-column connections in steel moment frames. Past research has indicated that bolted partially-restrained (PR) connections can serve as viable alternatives for beam-to-column connections to resist lateral loads. This paper addresses the seismic behavior of special moment frames (SMFs) incorporating PR connections. A series of archetypical buildings are modeled in OpenSees using varying levels of stiffness, strength, and strain hardening in the PR beam-to-column connections. Incremental dynamic analyses (IDAs) are performed on the PR archetypes and the results are compared to a typical building archetype constructed with conventional FR connections. The models are subjected to incrementally larger time histories until the frames fail. Maximum interstory drifts, maximum total roof drifts and maximum base shears are recorded for each model throughout the analyses. The PR archetypes are designed and constructed to engage all of the frames in each principal direction to act as the seismic force resisting system (SFRS) whereas the FR archetype is constructed to engage only the perimeter frames as the SFRS. The PR archetypes are modelled to represent a global building stiffness equivalent to the global building stiffness of the conventional FR archetype. The PR connections are modeled with trilinear moment-rotation characteristics using rotational springs. The advantages of using PR frames include smaller member sizes and increased redundancy in the SFRS compared to conventional FR framing. Since most PR connections are of the bolted type, they generally cost less and are easier to assemble. The results of this study reveal that buildings constructed with PR connections that meet or exceed minimal levels of stiffness and strength have very similar seismic performance compared to buildings constructed with FR connections. The recommendation is made to accept PR connections for prequalification in SMFs.

Author: Bruce F. Maison
Publisher:
ISBN:
Category : Building, Iron and steel
Languages : en
Pages : 148

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Author: Bruce F. Maison
Publisher:
ISBN:
Category : Building, Iron and steel
Languages : en
Pages : 74

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Book Description
An analytical investigation into the seismic performance of buildings designed with partially restrained (PR) connections as the main elements in the lateral forces resisting system was conducted. The 3- and 9-story buildings used in this analysis were redesigns of buildings previously designed using fully-restrained (FR) connections. Connection stiffnesses and capacities were varied over a range of values to determine their influence on the response of the PR frames. Nonlinear time history analyses were performed on a suite of ground motions to compare performance with the FR design.

Author: Federal Emergency Agency
Publisher: FEMA
ISBN:
Category :
Languages : en
Pages : 11

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This report, FEMA-350 - Recommended Seismic Design Criteria for New Steel Moment-Frame Buildings has been developed by the SAC Joint Venture under contract to the Federal Emergency Management Agency (FEMA) to provide organizations engaged in the development of consensus design standards and building code provisions with recommended criteria for the design and construction of new buildings incorporating moment-resisting steel frame construction to resist the effects of earthquakes. It is one of a series of companion publications addressing the issue of the seismic performance of steel moment-frame buildings. The set of companion publications includes: FEMA-350 - Recommended Seismic Design Criteria for New Steel Moment-Frame Buildings. This publication provides recommended criteria, supplemental to FEMA-302 - 1997 NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures, for the design and construction of steel moment-frame buildings and provides alternative performance-based design criteria. FEMA-351 - Recommended Seismic Evaluation and Upgrade Criteria for Existing Welded Steel Moment-Frame Buildings. This publication provides recommended methods to evaluate the probable performance of existing steel moment-frame buildings in future earthquakes and to retrofit these buildings for improved performance. FEMA-352 - Recommended Postearthquake Evaluation and Repair Criteria for Welded Steel Moment-Frame Buildings. This publication provides recommendations for performing postearthquake inspections to detect damage in steel moment-frame buildings following an earthquake, evaluating the damaged buildings to determine their safety in the postearthquake environment, and repairing damaged buildings. FEMA-353 - Recommended Specifications and Quality Assurance Guidelines for Steel Moment-Frame Construction for Seismic Applications. This publication provides recommended specifications for the fabrication and erection of steel moment frames for seismic applications. The recommended design criteria contained in the other companion documents are based on the material and workmanship standards contained in this document, which also includes discussion of the basis for the quality control and quality assurance criteria contained in the recommended specifications. The information contained in these recommended design criteria, hereinafter referred to as Recommended Criteria, is presented in the form of specific design and performance evaluation procedures together with supporting commentary explaining part of the basis for these recommendations.

Author: Stephen A. Mahin
Publisher:
ISBN:
Category : Buckling (Mechanics)
Languages : en
Pages : 14

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Author: Alfredo Reyes-Salazar
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Author: Mohammad Malakoutian
Publisher:
ISBN:
Category : Earthquake resistant design
Languages : en
Pages : 217

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Book Description
The Linked Column Frame system (LCF) is a new structural steel frame system capable of achieving enhanced seismic performance and safely providing continued occupancy of buildings impacted by moderate earthquake events. The LCF consists of two components: a primary lateral system, denoted the linked column, which is made up of dual columns interconnected with replaceable link beams; and a secondary moment frame lateral/gravity system that is a flexible moment resisting frame with beams having fully restrained connections at one end and simple connections at the other. The linked columns are designed to limit seismic forces and provide energy dissipation through yielding of the links, while preventing damage to the moment frame under certain earthquake hazard levels. A design procedure is proposed that ensures the links of the linked column yield at a significantly lower story drift than the beams of the moment frame, enabling design of this system for two distinct performance states: rapid repair, where only link damage occurs and relatively quick link replacement is possible; and collapse prevention, where both the linked column and moment frame may be damaged. Nonlinear dynamic analyses of prototype buildings were conducted using OpenSees and the results identified how the system's parameters impact the ability of the LCF to achieve the performance objectives and the adequacy of the proposed design procedure. In general, the LCF system provides collapse prevention for longer return period events and enables rapid repair following earthquakes with shorter return periods. The seismic performance factors for the LCF system, including the response modification coefficient, the system overstrength factor, and the deflection amplification factor were established following recently established procedures described in FEMA P695 (2009). These parameters are necessary for inclusion of the system in the building codes. Finally, models were developed in support of the experimental validation of the system's performance being done using hybrid simulation at the Network for Earthquake Engineering Simulation Laboratory at the University of California, Berkeley. Using the modeling techniques developed here, the numerical portion of the hybrid simulation specimen has been developed and used to predict the experimental response. The experiments are being conducted by collaborators at Portland State University.

Author: Ugo Morelli
Publisher: DIANE Publishing
ISBN: 9780788176791
Category : Science
Languages : en
Pages : 368

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Book Description
Provides a process for seismic evaluation of existing buildings in any region of seismicity. Buildings are evaluated to either the Life Safety or Immediate Occupancy Performance Level. Provides instruction to the evaluating design professional on how to determine if a building is adequately designed and constructed to resist seismic forces. All aspects of building performances are considered in terms of foundation/geologic, structural, hazard, nonstructural issues. Reflects advancements in technology; incorporates design professional experience; incorporates lessons learned during recent earthquakes; and much more.

Author: Chatchai Jiansinlapadamrong
Publisher:
ISBN:
Category : Earthquake resistant design
Languages : en
Pages : 527

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Book Description
Until recently, all special truss moment frame (STMF) experimental research was done on only double angle STMFs. In order to satisfy the code seismic drift limitation, especially for mid-rise and tall multistory buildings, a large column section is needed, when double angle sections are used. However, heavy chord members can be used in this instance. Due to configuration of STMFs, the chord members in the special segment of an STMF experience higher rotational demand than the story drift. As a result, there is a need to verify large rotational capacity of other heavy steel shapes. Recent analytical investigation and experimental investigation at component level showed that double channel sections could be used in STMFs. However, to maintain large rotational capacity of double channel sections, lateral support was needed near plastic hinge region to prevent lateral torsional buckling (LTB). This research investigated ways to maintain double channel rotational capacity without having to provide lateral support and viability of using double HSS sections which are not susceptible to LTB in STMFs. A new connection detail was tested and the results showed that lateral torsional buckling was eliminated. Results on double HSS sections showed that it could maintain strength at very high rotation. Other than verifying large rotational capacity of double channel and double HSS sections, this research also introduced incorporating buckling-restrained braces to provide additional stiffness and strength to full scale STMF subassemblage test. Moreover, the possibility of extending span the length of STMFs to 90 ft was explored. When a span length of STMF is very long, its stiffness could be compromise. In addition, induced axial force due to gravity loading could be significant. The effect of axial load on ductility of double channel sections was studied. Seismic performance of 90 ft span STMFs was evaluated and design recommendation are proposed.