Seismic Response of Reinforced Concrete Intermediate and Special Moment Resisting Frames PDF Download

Author: Changyue Lu
Publisher:
ISBN:
Category : Reinforced concrete
Languages : en
Pages : 198

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Author: Michael James Richard
Publisher:
ISBN:
Category :
Languages : en
Pages : 324

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Abstract: Reinforced concrete moment-resisting frames are structural systems that work to resist earthquake ground motions through ductile behavior. Their performance is essential to prevent building collapse and loss of life during a seismic event. Seismic building code provisions outline requirements for three categories of reinforced concrete moment-resisting frames: ordinary moment frames, intermediate moment frames, and special moment frames. Extensive research has been conducted on the performance of special moment-resisting frames for areas of high seismic activity such as California. More research is needed on the performance of intermediate moment frames for areas of moderate seismicity because the current code provisions are based on past observation and experience. Adapting dynamic analysis software and applications developed by the Pacific Earthquake Engineering Research (PEER) Group, a representative concrete intermediate moment frame was designed per code provisions and analyzed for specified ground motions in order to calculate the probability of collapse. A parametric study is used to explore the impact of changes in design characteristics and building code requirements on the seismic response and probability of collapse, namely the effect of additional height and the addition of a strong column-weak beam ratio requirement. The results show that the IMF seismic design provisions in ACI 318-08 provide acceptable seismic performance based on current assessment methodology as gravity design appeared to govern the system. Additional height did not negatively impact seismic performance, while the addition of a strong-column weak-beam ratio did not significantly improve results. It is the goal of this project to add insight into the design provisions for intermediate moment frames and to contribute to the technical base for future criteria.

Author: T.G. Sitharam
Publisher: Springer Nature
ISBN: 9813340053
Category : Science
Languages : en
Pages : 406

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This volume presents select papers presented at the 7th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. The papers discuss advances in the fields of soil dynamics and geotechnical earthquake engineering. Some of the themes include seismic design of deep & shallow foundations, soil structure interaction under dynamic loading, marine structures, etc. A strong emphasis is placed on connecting academic research and field practice, with many examples, case studies, best practices, and discussions on performance based design. This volume will be of interest to researchers and practicing engineers alike.

Author: Omar El Kafrawy
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Jack Moehle
Publisher: McGraw Hill Professional
ISBN: 0071839453
Category : Technology & Engineering
Languages : en
Pages : 783

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Complete coverage of earthquake-resistant concrete building design Written by a renowned seismic engineering expert, this authoritative resource discusses the theory and practice for the design and evaluation of earthquakeresisting reinforced concrete buildings. The book addresses the behavior of reinforced concrete materials, components, and systems subjected to routine and extreme loads, with an emphasis on response to earthquake loading. Design methods, both at a basic level as required by current building codes and at an advanced level needed for special problems such as seismic performance assessment, are described. Data and models useful for analyzing reinforced concrete structures as well as numerous illustrations, tables, and equations are included in this detailed reference. Seismic Design of Reinforced Concrete Buildings covers: Seismic design and performance verification Steel reinforcement Concrete Confined concrete Axially loaded members Moment and axial force Shear in beams, columns, and walls Development and anchorage Beam-column connections Slab-column and slab-wall connections Seismic design overview Special moment frames Special structural walls Gravity framing Diaphragms and collectors Foundations

Author: Edmund D. Booth
Publisher: Longman Scientific and Technical
ISBN:
Category : Earthquake resistant design
Languages : en
Pages : 392

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This is an essential reference for practicing civil and structural engineers and architects involved with projects in earthquake regions. Undergraduate and advanced students of earthquake engineering will welcome the comprehensive and approachable coverage.

Author: Hajime Umemura
Publisher: IABSE
ISBN: 3857480297
Category : Buildings
Languages : en
Pages : 70

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Author: Adeel Zafar
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Vulnerability of buildings to seismic hazards is more drastic in developing countries with high seismicity, as compared to developed countries. This is primarily attributed to the lack of seismic design guidelines, which fit the type of structural systems and practices that are often applied in such parts of the world. Response reduction factors (R factors) are essential seismic design tools, which are typically used to describe the level of inelasticity expected in lateral structural systems during an earthquake. The R factors in many developing countries are often adopted from the well developed seismic design codes used in the United States or Europe. These R factors provide false representation for the structural practices applied in developing countries and thus considered unrealistic. So there is a dire need to come up with realistic R factors for various structural systems used in such countries. This study utilizes incremental dynamic analysis (IDA) and peak ground parameters to determine the R factor of reinforced concrete (RC) moment resisting frames (MRFs) in Pakistan. A suite of ground motion records from the region is used in the study. Two-dimensional building models are developed in OpenSees and subjected to nonlinear time history analysis. Fiber sections with different material constitutive behaviors are constructed for each of the building0́9s critical elements. The reinforcement detailing of the analyzed buildings is determined from two prototype buildings in Pakistan. A parametric study involving RC MRFs with variation in dimensional and material properties was conducted to examine the effect of these properties on R factor. Results showed that R factor is affected by both geometric configuration and material strength; however, variation in geometric parameters tends to display more significant impact on the R factor value. The results also show that the R factors recommended by the United States seismic design provisions are unconservative and over estimate the R factor values for some selection of ground motion while it is conservative for others.

Author: Edmund D. Booth
Publisher: Thomas Telford
ISBN: 9780727729477
Category : Technology & Engineering
Languages : en
Pages : 312

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Book Description
Talking about earthquake engineering, this second edition is intended for practising structural engineers, including those with little or no knowledge of the subject, and also for advanced engineering students. It discusses the provisions of seismic codes, particularly Eurocode 8.

Author: Tea Visnjic
Publisher:
ISBN:
Category :
Languages : en
Pages : 282

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In recent decades, improvement in construction and design practices and better estimation in seismic demands has led to an increasing number of reinforced concrete special moment resisting frame (SMRF) buildings with height and member sizes exceeding those typically built in the past. While current codes improved greatly over the years, many design specifications introduced around the prevailing practices from decades ago remain in effect. The aim of this dissertation is to address some potentially problematic areas in current design standards and propose ways to improve them. Specifically, the focal points of the work presented concern with two separate areas in the design of reinforced concrete SMRF buildings. The first topic is the investigation of the transverse steel spacing requirements in the plastic hinge zones of reinforced concrete SMRF beams. Two large reinforced concrete SMRF beams were built and subjected to earthquake-like damage in the laboratory test with the goal: (a) to demonstrate that the maximum hoop spacing limits specified in the concurrent 2008 ACI 318 Code could produce a beam with performance inferior to the implied expectations at design level ground shaking intensity, and (b) to evaluate the effect of reducing this hoop spacing limit and recommend code changes for the 2011 ACI 318 Code. The experiments included two 30 in. x 48 in. beams with identical size, material properties, and longitudinal reinforcement ratio, but different transverse hoop spacing, which were subjected to reverse cyclic displacement history to simulate the earthquake-induced deformations expected at the design earthquake (DE) hazard level. The first specimen, Beam 1, was designed with the 2008 ACI 318 hoop spacing requirement and exhibited limited ductility before experiencing sudden and significant loss of load bearing capacity at a displacement ductility of 3.4. The second specimen, Beam 2, built with reduced hoop spacing, showed notable improvement in response and was capable of sustaining 90% of its load bearing capacity up to a displacement ductility level of 6.5. Of the two specimens, only Beam 2 sustained the deformation levels compatible with the DE shaking intensity without significant loss of strength. Both beams, however, failed due to longitudinal bar buckling, which pointed to potential vulnerability in the current transverse reinforcement detailing using multiple piece hoops consisting of stirrups with vertical and horizontal crossties and bracing only alternate longitudinal bars with vertical crossties. Further experimental research in this area is strongly recommended. The second topic concerns with the global nonlinear response of reinforced concrete SMRFs under strong ground motion, with emphasis placed on seismic shear demand in SMRF columns. Current ACI 318 specifications offer two different approaches in calculating the seismic shear demand, however with some ambiguity and much room for free interpretation that can vastly impact the shear capacity of the column and potentially result in unconservative design. Total of eight numerical models of buildings with perimeter SMRFs of varying configurations were analyzed in two separate studies (four buildings are presented in Chapter 5 and the other four in Chapter 6) under multiple ground acceleration records to find the mean shear envelopes in the columns. Depending on the interpretation of the ACI 318 code, various levels of conservatism in estimating column shears were achieved. A common design approach to estimate seismic column shear from the joint equilibrium with beams having reached the probable moment strengths, while the unbalanced moment is distributed evenly between the columns above and below, was shown to lead to unconservative seismic shear estimate, in some cases resulting in half of the actual demand computed in the nonlinear dynamic analyses. It is demonstrated that the seismic shear demand on columns is better estimated with a method based on amplifying the seismic shear calculated with the elastic code-prescribed modal response spectrum analysis with the system overstrength and dynamic amplification factors.