Seismic Design Provisions - the Canadian Highway Bridge Design Code (original) (raw)
Related papers
LRFD Seismic Analysis and Design of Bridges Reference Manual: NHI Course No. 130093 and 130093A
2014
The contents of this report reflect the views of the authors, who are responsible for the facts and accuracy of the data presented herein. The contents do not necessarily reflect policy of the Department of Transportation. This report does not constitute a standard, specification, or regulation. The United States Government does not endorse products or manufacturers. Trade or manufacturer's names appear herein only because they are considered essential to the object of this document.
PART 2 BRIDGE SEISMIC DESIGN SPECIFICATIONS (PACKAGE A
Although the DPWH has its own "Design Guidelines, Criteria and Standards for Public Works and Highways" which was first published in 1982, the seismic provisions of this guidelines has been outdated by recent earthquake events in the country and elsewhere. Owing to this deficiency in the DPWH Guidelines, the seismic design of bridges in the Philippines relies heavily on the "American Association of State Highway and Transportation Officials (AASHTO) Standard Specifications for Highway Bridges" (17 th Ed., 2002 using the load factor and allowable stress design) with the seismic design provisions practically guiding the design of new bridges in the Philippines. Although AASHTO's bridge design specifications have evolved to the load and resistance factor design (LRFD) and the displacement-based design procedures using probability theory and limit states, the DPWH still applies the earlier version of AASHTO in seismic design. On the other hand, seismic design of bridges in Japan focused on the performance-based approach which evolved based on the occurrences of recent large earthquakes in Japan. This Chapter will describe the chronology of the development of the seismic design specifications for the Philippines, Japan and the USA (Figure 5.2.1-1) based on large earthquake events that led to the current state of the seismic design codes.
Appendixes for NCHRP Report 489: Design of Highway Bridges for Extreme Events
2003
This CD-ROM contains the appendixes to National Cooperative Highway Research Program (NCHRP) Report 489, "Design of Highway Bridges for Extreme Events." Appendix A gives the recommended revisions to the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) specifications. Appendixes B through G describe and illustrate the reliability and analysis models used during the calibration of the proposed load combination factors. Appendixes H and I describe and illustrate the earthquake and scour reliability models developed during a scope extension phase of NCHRP Project 12-48.
Earthquake and Multiple Hazard Protection of Highway Bridges Fhwa Contract TEA-21 Ext
2005
There are some similarities between seismic and blast effects on bridge structures: both major earthquakes and terrorist attacks/accidental explosions are rare events that can induce large inelastic deformations in the key structural components of bridges. Since many bridges are (or will be) located in areas of moderate or high seismic activity, and because many bridges are potential terrorist targets, there is a need to develop structural systems capable of performing equally well under both events. The objective of this research project is to develop a multi-hazard bridge pier concept capable of providing an adequate level of protection against collapse under both seismic and blast loading, and whose members’ dimensions are not very different from those currently found in typical highway bridges.
Seismic performance of bridges designed according to AS 5100
2012
Bridges are the critical components of a nation's transportation system, as closure of an important bridge in the event of an earthquake can disrupt the total transportation network. In Australian standard for bridge design, ASBD (AS 5100-2004), consistent with other major bridge design codes (for example, AASHTO in the USA and CAN/CSA-S6 in Canada), bridges are classified according to their importance levels. The anticipated performances (performance objectives) of the bridges in small to moderate (Return Period, RP= 100 years), design level (RP= 500 years) and large (RP= 2500 years) earthquake events have been specified in major bridge design codes, although not explicitly stated in ASBD for bridge design. It is believed that similar performance objectives should also be anticipated for the bridges designed for different importance levels according to ASBD. However, there appears to be no requirement in the code to check whether such multiple performance objectives have been achieved for the designed bridges. Also, no engineering parameters have been assigned to the anticipated performance objectives. This paper correlates seismic performance objectives (both qualitative and quantitative) with engineering parameters which are based on the data collected from available experimental investigations and field investigations from recent earthquakes. A simple methodology has been developed and validated with experimental results for assessing the performance of bridges designed according ASBD. It has been found that the design rules prescribed in ASBD do not guarantee that intended multiple seismic performance objectives can be obtained. Implicit seismic design rule in the form of Performance Response Modification Factor (PRMF) has been outlined for performance based seismic design of bridges. The implicit design rule has the potential for further development in order to be incorporated in the next generation ASBD.
Evaluation of Comprehensive Seismic Design of Bridges (LRFD) in Illinois
2004
University cooperative transportation research unit underwritten by the Illinois Department of Transportation. The purpose of the Center is the conduct of research in all modes of transportation to provide the knowledge and technology base to improve the capacity to meet the present and future mobility needs of individuals, industry and commerce of the State of Illinois. Research reports are published throughout the year as research projects are completed. The contents of these reports reflect the views of the authors who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Illinois Transportation Research Center or the Illinois Department of Transportation. This report does not constitute a standard, specification, or regulation. Neither the United States Government nor the State of Illinois endorses products or manufacturers. Trade or manufacturers' names appear in the reports solely because they are considered essential to the object of the reports.
Seismic Loading Standards and Performance of Bridges
Proceedings of the International Symposium held at the University of Dundee, Scotland, UK on 3–4 September 2003, 2003
Western Gujarat, in India experienced a very severe earthquake (measuring 7.7 on Richter Scale) in the early hours of 26th January 2001. The earthquake resulted in large-scale damage to the various structures in and around areas such as Bhuj, Gandhidham, Rajkot, Morvi etc. This paper describes the performance of the Surajbari bridge which was almost complete at the time of the earthquake, opened to traffic in March 2001 and located only 40 km from the epicenter of the earthquake with particular reference to the Seismic Loading standards of India and proposes recommendations for improving the current standards in light of the experience gained in the design of this bridge. The paper also compares the seismic loading standards such as AASHTO, JRA etc. with those of Indian practice and compares the aseismic design philosophy to be adopted and discusses the application of base isolation principles and energy dissipating mechanisms.
Canadian Journal of Civil Engineering, 2014
Recent research efforts have focused on the development of performance based seismic design methodologies for structures. However, the seismic design rules prescribed in the current Canadian Highway Bridge Design Code (CHBDC) is based largely on force based design principles. Although a set of performance requirements (performance objectives) for different return period earthquake events have been specified, there is no explicit requirement in the CHBDC to check the attainment of such performance objectives for the designed bridges. Also, no engineering parameters have been assigned to the specified performance objectives. This paper correlates seismic performance objectives (both qualitative and quantitative) with engineering parameters, based on the data collected from published experimental investigations and field investigation reports of recent earthquakes. A simple method has been developed and validated with experimental results for assessing the performance of bridges designed according to CHBDC. It has been found that the design rules prescribed in CHBDC do not guarantee that specified multiple seismic performance objectives can be achieved. An implicit seismic design rule in the form of performance response modification factor has been outlined for the performance based seismic design of bridges.