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MCEER Bulletin, Volume 24, Number 2, Fall/Winter 2010

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Volume 24, Number 2, Fall/Winter 2010

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New Technical Reports

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Seismic Testing of a Full-Scale Two-Story Light-Frame Wood Building: NEESWood Benchmark Test

By Ioannis P. Christovasilis, Andre Filiatrault and Assawin Wanitkorkul, 7/22/09, MCEER-09-0005, 216 pages, $35.00

This report is the first in a series resulting from the NEESWood Project. It documents the benchmark shake table test program of a full-scale two-story wood frame townhouse building. The experimental program focused on the various construction elements that could significantly influence the seismic response of these types of buildings. The testing was divided into five phases: (1) engineered wood structural (shear) walls alone; (2) wood structural walls incorporating viscous fluid dampers; (3) installation of gypsum wallboard to engineered wood structural walls; (4) installation of gypsum wallboard to interior partition walls and ceilings; and (5) installation of stucco as an exterior wall finish. Two kinds of tri-axial historical ground motions were used for the tests: a Design Basis Earthquake (DBE) with a probability of exceedance of 10% in 50 years, or a return period of 475 years; and a Maximum Credible Earthquake (MCE) with a probability of exceedance of 2% in 50 years, or a return period of 2,475 years. This report provides a detailed analysis of the experimental results of test phases 1, 3, 4 and 5. The test results show that the installation of gypsum wallboard to the interior surfaces of the structural walls substantially improved the seismic response of the test structure. The application of exterior stucco provided further improvements, particularly in the longitudinal direction, where the shear response of the wall piers dominated. The results of test phase 2 are documented in a companion report.

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Proceedings of the Special International Workshop on Seismic Connection Details for Segmental Bridge Construction

Edited by W. Phillip Yen and George C. Lee, 12/21/09, MCEER-09-0012, 204 pages, $35.00

The Seismic Accelerated Bridge Construction (SABC) research project at MCEER is a five-year program of study funded by the FHWA. The major program thrust is to develop design recommendations for segmental bridges of short-to-medium spans in strong seismic regions. Specific emphases are given to the seismic behavior and design of segmental piers and the integrity of system performance of the segmental bridges considered in this research project. The specific objectives of this workshop are to gather information on current research and/or practice on the connection details of segmental bridges for SABC from Japan, Taiwan and the State of Washington in the United States, so that they can be documented and integrated with the MCEER studies to formulate a SABC monograph on precast segmental concrete bridges.

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Direct Displacement Procedure for Performance-Based Seismic Design of Multistory Woodframe Structures

By WeiChiang Pang and David Rosowsky, 4/26/10, MCEER-10-0001, 88 pages, $25.00

This report presents a direct displacement-based design (DDD) procedure for multistory woodframe structures. The proposed method can provide estimates of inter-story drift in multistory structures and does not require that a nonlinear pushover analysis or dynamic time-history analysis of the complete structure be performed. The proposed design procedure is applicable to woodframe structures of regular shape with relatively symmetric plan and rigid diaphragms (i.e., no torsional effects). A three-story woodframe structure was designed using the proposed DDD procedure and evaluated using earthquakes representative of the different hazard levels considered. The results showed that the design inter-story drift profiles closely matched the average maximum profiles obtained from the nonlinear time-history analyses, thereby validating the proposed procedure.

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Simplified Direct Displacement Design of Six-Story NEESWood Capstone Building and Pre-Test Seismic Performance Assessment

By WeiChiang Pang, David Rosowsky, John van de Lindt and Shiling Pei, 5/28/10, MCEER-10-0002, 184 pages, $30.00

This report presents a simplified direct displacement design (DDD) procedure which was used to design the shear walls for a six-story woodframe structure. This structure, referred to as the NEESWood Capstone Building, was designed to meet four performance expectations: damage limitation, life-safety, far-field collapse prevention, and near-fault collapse prevention. A series of nonlinear time history analyses were performed using suites of both far-field and near-fault ground motion records to verify that design requirements were met. The distributions of inter-story drifts obtained from these time history analyses confirmed that the building met all four performance expectations, thereby validating the DDD procedure. Additionally, collapse analysis in accordance with the Applied Technology Council project 63 (ATC-63) methodology was performed. The results of incremental dynamic analyses confirmed that the building had an adequate capacity or margin against collapse, as dictated by the ATC-63 methodology.

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Integration of Seismic Protection Systems in Performance-Based Seismic Design of Woodframed Structures

By Jayesh K. Shinde and Michael D. Symans, 6/18/10, MCEER-10-0003, 224 pages, $35.00

The research presented in this report focuses on the unique characteristics of woodframed structures that affect the design and implementation of seismic protection systems, and approaches used to increase the performance reliability of these structures in regions of high seismic intensity. In addition, the development of simplified nonlinear analysis and design procedures for structures that incorporate seismic protection systems are discussed. Finally, the results from experimental shaking table tests and nonlinear dynamic response-history analyses are presented to clearly demonstrate the improved seismic performance that can be achieved via application of seismic protection systems to woodframed structures.

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Analytical Development and Experimental Validation of a Structural-Fuse Bridge Pier Concept

By Samer El-Bahey and Michel Bruneau, 10/1/2010, MCEER-10-0005, 480 pages, $60.00

This report describes an experimental and analytical study of a structural fuse concept where structural steel elements are added to a bridge bent to increase its strength and stiffness. The structural fuse is designed to sustain the seismic demand and dissipate seismic energy through hysteretic behavior of the fuses while keeping the gravity-resisting structural elements of the bridge bent elastic. A parametric study is first carried out to investigate the effect of adding structural fuses to a RC bridge bent. Second, an experimental program for two large-scale twin-column segmental bridge bent specimens in an accelerated bridge construction application is developed to investigate the impact of the fuses on the behavior of the bridge system. The experimental work is followed by an analytical study to replicate the experimental results and to assess the adequacy of the design recommendations. Two types of structural fuses are used in this research: Buckling Restrained Braces (BRBs) for short length applications, and Steel Plate Shear Links (SPSLs) that are designed and detailed to dissipate energy through shear yielding. Both types of fuses resulted in increased stiffness and strength of the test system.

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A Framework for Defining and Measuring Resilience at the Community Scale: The PEOPLES Resilience Framework

By Chris S. Renschler, Amy E. Frazier, Lucy A. Arendt, Gian Paolo Cimellaro, Andrei M. Reinhorn and Michel Bruneau, 10/8/10, MCEER-10-0006, 106 pages, $25.00

This report presents the results of a one-year study that builds on previous MCEER research linking the four resilience properties (robustness, redundancy, resourcefulness, and rapidity) and resilience dimensions (technical, organizational, societal and economic). The objective was to establish a holistic framework for defining and measuring disaster resilience for a community at various scales. Seven dimensions characterizing community functionality have been identified and are represented by the acronym PEOPLES: Population and Demographics, Environmental/Ecosystem, Organized Governmental Services, Physical Infrastructure, Lifestyle and Community Competence, Economic Development, and Social-Cultural Capital. The project was funded by the National Institute of Standards and Technology (NIST).