Download or read book Analytical Development of Capacity Design Factors for a Precast Concrete Diaphragm Seismic Design Methodology written by Ge Wan and published by . This book was released on 2008 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objective of the dissertation work is to examine the capacity of precast concrete diaphragms. This work is part of a multi-university research effort to develop a new seismic design methodology for precast/prestressed concrete floor diaphragms. To accomplish this, two-dimensional finite element (FE) models of precast floor diaphragms are created, including new elements to match the response of reinforcing details under combined forces. Using these models, nonlinear static"pushover"analyses are performed by applying body forces in the plane of the floor. The analyses are composed of three major parts:(1) Parametric studies to determine the required diaphragm shear strength relative to design (flexural) strength, termed"shear reinforcement overstrength", to promote a ductile mechanism in precast diaphragms. The performance of precast diaphragms with different shear reinforcement overstrength is examined. Appropriate shear reinforcement overstrength design factors are proposed to produce certain performance targets, in terms of a number of key parameters related to diaphragm geometry and the properties of the diaphragm reinforcing details.(2) Parametric studies to examine the effects of"secondary"diaphragm elements (spandrels, internal beams) on precast diaphragm behavior. Though not directly counted in design to participate diaphragm action, the secondary elements and their connections to the main diaphragm may modify the strength, stiffness and deformation capacity of the diaphragm. Analytical studies are performed to examine their effect on the global characteristics and local demands of precast floor diaphragms. The parameters evaluated include the characteristics of the connection details, the seismic hazard level used in design, diaphragm geometry, and layouts of spandrels and internal beams.(3) Development of a rational method for calculating the service stiffness and yield strength of precast concrete diaphragms. The method involves input of diaphragm geometry andreinforcing details. The method is verified analytically through comparisons to a set of FE analyses for an idealized diaphragm representation (regular single span diaphragm idealized with simple end supports). The method verified for a single set of diaphragm reinforcement details is used to estimate the properties over a range of untopped and topped diaphragm systems. Consideration of spandrel and internal beams in the method is discussed.

Download or read book Seismic Design of Reinforced and Precast Concrete Buildings written by Robert E. Englekirk and published by John Wiley & Sons. This book was released on 2003-03-10 with total page 850 pages. Available in PDF, EPUB and Kindle. Book excerpt: * Presents the basics of seismic-resistant design of concrete structures. * Provides a major focus on the seismic design of precast bracing systems.

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Tailor Made Concrete Structures written by Joost C. Walraven and published by CRC Press. This book was released on 2008-05-01 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years knowledge of concrete and concrete structures has increased, as has its applications. New types of concrete challenged scientists and engineers, and ecological constraints encouraged the implementation of life cycle design of concrete structures, moving the focus more and more to maintenance and uprating of structures. And since bui

Download or read book Proceedings fib Symposium in Amsterdam Netherlands written by FIB – International Federation for Structural Concrete and published by FIB - Féd. Int. du Béton. This book was released on 2008-05-01 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Design of Precast Concrete Building Structures written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2003-01-01 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this state-of-art report is to present current practices for use of precast and prestressed concrete in countries in seismic regions, to recommend good practice, and to discuss current developments. The report has been drafted by 30 contributors from nine different countries. This state-of-art report covers: state of the practice in various countries; advantages and disadvantages of incorporating precast reinforced and prestressed concrete in construction; lessons learned from previous earthquakes; construction concepts; design approaches; primary lateral load resisting systems (precast and prestressed concrete frame systems and structural walls including dual systems) diaphragms of precast and prestressed concrete floor units; modelling and analytical methods; gravity load resisting systems; foundations; and miscellaneous elements (shells, folded plates, stairs and architectural cladding panels). Design equations are reported where necessary, but the emphasis is on principles. Ordinary cast-in-place reinforced concrete is not considered in this report. This fib state-of-the-art report is intended to assist designers and constructors to provide safe and economical applications of structural precast concrete and at the same time to allow innovation in design and construction to continue. This Bulletin N° 27 was approved as an fib state-of-art report in autumn 2002 byfib Commission 7, Seismic design.

Download or read book PCI Journal written by and published by . This book was released on 2008 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Techniques for the Seismic Rehabilitation of Existing Buildings written by and published by FEMA. This book was released on 2006 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book M J Nigel Priestley Symposium written by Mervyn J. Kowalsky and published by Iuss Press. This book was released on 2008 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Precast Concrete Diaphragm Design by ASCE 7 16 written by Brandon Cook and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Floor and roof diaphragms are an important aspect of a building's structural lateral system. The diaphragm resists in-plane seismic loads and transfers them to the vertical lateral force resisting system. If they are not properly designed, the failure could be devastating. After the 1994 Northridge earthquake the failures of multiple precast structures were investigated, and it was determined that inadequate diaphragm design was the cause of the failures. It was found that previous code provisions underestimated the diaphragm design forces. Additionally, diaphragms were assumed to behave elastically during seismic events, but it was observed that a large earthquake could cause inelastic behavior of diaphragms. Code provisions prior to the ASCE 7-16 determined diaphragm design forces based solely on the fundamental modal response of structures. However, further research proved that higher modes also influenced diaphragm forces. Therefore, a change was warranted to diaphragm design provisions in the ASCE 7-16. The diaphragm design provisions in the ASCE 7-16 ensure adequate ductility and strength of diaphragms and provides different options for elastic or inelastic diaphragm design. Not all design options are applicable and permitted for every scenario. The selection of the design option will depend on the seismic design category, the geometry of the diaphragm, and the number of stories of the building. The new diaphragm design provisions in the ASCE 7-16 are required for precast diaphragm design. This report provides a detailed design procedure for precast diaphragms and briefly discusses the research done on precast diaphragms that led to the provisions in the ASCE 7-16. In addition, a parametric study was conducted to illustrate how the design options change the diaphragm design forces and required reinforcement.

Download or read book NEHRP Recommended Provisions National Earthquake Hazards Reduction Program for Seismic Regulations for New Buildings and Other Structures Commentary written by United States. Federal Emergency Management Agency and published by . This book was released on 2001 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Risk Assessment and Retrofitting written by Alper Ilki and published by Springer Science & Business Media. This book was released on 2009-10-03 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many more people are coming to live in earthquake-prone areas, especially urban ones. Many such areas contain low-rise, low-cost housing, while little money is available to retrofit the buildings to avoid total collapse and thus potentially save lives. The lack of money, especially in developing countries, is exacerbated by difficulties with administration, implementation and public awareness. The future of modern earthquake engineering will come to be dominated by new kinds of measuring technologies, new materials developed especially for low-rise, low-cost buildings, simpler and thus lower cost options for retrofitting, cost cutting and raising public awareness. The book covers all the areas involved in this complex issue, from the prevention of total building collapse, through improvement techniques, to legal, financial, taxation and social issues. The contributors have all made valuable contributions in their own particular fields; all of them are or have been closely involved with the issues that can arise in seismic zones in any country. The recent research results published here offer invaluable pointers to practicing engineers and administrators, as well as other scientists whose work involves saving the lives and property of the many millions of people who live and work in hazardous buildings.

Download or read book Hearings on H R 6621 H R 7265 Department of Energy Authorization Legislation national Security Programs for Fiscal Year 1981 Before the Procurement and Military Nuclear Systems Subcommittee of the Committee on Armed Services House of Representatives Ninety sixth Congress Second Session written by United States. Congress. House. Committee on Armed Services. Procurement and Military Nuclear Systems Subcommittee and published by . This book was released on 1980 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Guide to the Design of Diaphragms Chords and Collectors written by and published by ICC International Code. This book was released on 2009 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hearings on H R 6621 H R 7265 Department of Energy Authorization Legislation national Security Programs for Fiscal Year 1981 Before the Procurement and Military Nuclear Systems Subcommittee of the Committee on Armed Services House of Representatives Ninety sixth Congress Second Session Hearings Held March 18 April 16 17 29 30 and June 4 1980 written by United States. Congress. House. Committee on Armed Services. Procurement and Military Nuclear Systems Subcommittee and published by . This book was released on 1980 with total page 1118 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analytical Method for Assessment of Seismic Shear Capacity Demand for Untopped Precast Double tee Diaphragms Joined by Mechanical Connectors written by Wei Zheng and published by . This book was released on 2001 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Guide for Reinforced Concrete Diaphragms written by and published by . This book was released on 2019-03 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide is the definitive resource on the design and detailing of diaphragms in cast-in-place reinforced concrete buildings. The requirements in ACI 318-14 are clearly summarized in figures and tables for quick reference. Comprehensive methods are provided on how to (1) determine diaphragm thickness based on strength and serviceability requirements; (2) calculate in-plane and collector forces based on ASCE/SEI 7-16 requirements; (3) model and analyze diaphragms; (4) determine the required reinforcement based on two different types of common construction methods; and (5) economically detail the required reinforcement based on the latest ACI 318 requirements. A step-by-step design procedure is provided that can be used for buildings assigned to Seismic Design Categories A through F. Numerous design aids and worked-out examples illustrate the code requirements for low-, mid-, and high-rise buildings, including buildings with irregularities.