s p o n s o r e d   l i n k s


Ductility Design of Foundations of Highway Bridge Abutments.pdf

October 7, 2009 · Filed Under Civil & Architectural Engineering  · Tags: , , , , ,

This pdf paper was written by Masahiro Shirato, Jiro Fukui and Junichi Koseki.

Right after the 1995 Hyogo-ken Nanbu earthquake (Kobe earthquake) in Japan, the Specifications for Highway Bridges and commentaries were revised in 1996[1, 2]. The specification has introduced ductility design of foundations of piers as standard seismic design against severe and rare scale earthquakes. It should be noted that the a seismic design of piers based on the ductility design itself was not new, but had been already introduced before the 1995 Hyogo-ken Nanbu earthquake against large earthquakes which correspond to type I motions of level 2 earthquake motions defined in detail later.

Nevertheless, abutments and their foundations have been exception in applying the ductility design even in the 1996 version of the specification, and the specification still required to check that they behave elastically against level 1 earthquake motions which are small to middle (or frequent scale) earthquakes as it had demanded in the past. The reasons for this judgment are the following. First, because of the lack of knowledge on a proper evaluation method of their performances, including the seismic active earth pressure at high seismic loads, it is difficult to establish any verification methods of seismic performance of abutments and their foundations against severe earthquakes. Second, there has been no case history in Japan where the damage to abutments or their foundations causes unseating of girders. Third, a bridge abutment is a structure resisting against the earth pressure exerted from the backfill at any moment, and thus it would be just pushed forward by the seismic earth pressure even if it suffers residual displacements during earthquakes, which would not directly result in the unseating of supporting girders.

However it is needed to develop an aseismic design method of abutments and their foundations against large earthquakes, which controls their damage within an acceptable extent to recover the service of road network as early as possible after the earthquakes.

After publishing our 1996 version of the specifications, we have constructed a database of past earthquake damage to abutments or abutment foundations in Japan, and have studied on the assessment methods which can distinguish the different damage extents for the case histories in our database. Separately, Koseki et al.[4] have recently proposed an evaluation method of active earth pressure at high seismic loads, and it enabled us to establish a computational method to assess seismic performance of abutment foundations. Consequently, we could newly introduce the ductility design of abutment foundations into the latest version of the Specifications for Highway Bridges revised in March 2002. The design method is based on the preceding frame work of the ductility design method of bridge pier foundations, while some modifications are implemented to it in order to reflect the above-mentioned peculiar mechanical characteristics of foundations of abutments. This paper describes the verification procedure and the process of the development of the new ductility design method of foundations of abutments.

Contents:

  • Abstract
  • Introduction
  • Fundamentals of seismic design of abutments and their foundations
  • Survey of case histories of damage to abutments
  • Seismic loads employed in the ductility design method of foundations of abutments
  • Seismic active earth pressure
  • Estimation of inelastic response of foundation system
  • Back-analysis of case histories and determination of allowable ductility factor
  • Concluding Remarks.

This pdf material is available FREE at Public Works Research Institute website, we merely collect the information, Online Free Ebooks neither affiliated with the author(s), the website and any brand nor responsible for its content and change of content. (Read our disclaimer here or here before you download the document from the website written above by clicking the below link).

Download free Ductility Design of Foundations of Highway Bridge Abutments.pdf (15 pages pdf file, 1 MB).

Related posts




You might also be interested in reading:
bridge abutments, bridge design books free dowload, Seismic bridge design pdf, seismic design of foundations, Design foundations pdf, free pdf download of design of bridge structures, ductility of earthquake, civil engineering concrete bridges rar ebooks, design of hihway bridge, download books of bridges design
« Prev

Disclaimer

http://www.onlinefreeebooks.net - provides you collection of links to other websites containing ebooks/manuals/cheatsheets either for computer geeks, technicians, automotive enthusiasts or programmers. We merely take the power of Google Search to find those materials and link to it. NONE OF THOSE MATERIALS ARE HOSTED IN THIS SERVER NOR UPLOADED BY ME IN SOMEONE'S SERVERS.

We are neither affiliated with authors and brands nor responsible for its content and change of content.

Information contained herein is provided "as is" without warranty of any kind, either expressed or implied, including any warranty of merchantability or fitness for a particular purpose. In no event shall ANYONE be held liable for any loss of profit, special, incidental, consequential, or other similar claims.

Comments

Leave a Reply