Change search
ReferencesLink to record
Permanent link

Direct link
Optimized design of integral abutments for a three span composite bridge
2005 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The aim of the thesis is to analyse the foundation piles supporting the bridge over Dalälven River in the middle-east Sweden, which is designed as an integral abutment bridge. The analytical part of the work includes the checking of stresses in piles supporting integral abutments. The piles that are considered are steel piles with three different cross-sections: pipe pile with outer diameter equals 219.1 mm and 12.5 mm thick and two different cross-sections of X piles (200x30mm and 180x24 mm), which are the Swedish innovation in the field of integral abutments bridges. The piles analysed are loaded with vertical force and subjected to horizontal displacement caused by contracting and expanding under influence of temperature changes, but also by breaking and accelerating of vehicles on the bridge and shrinking and creeping of a concrete bridge deck. The particular attention is paid to the influence of displacements perpendicular to the longitudinal axis of the pile for the pile’s behaviour. In this analysis the behaviour of pile depends a lot on soil surrounding the pile. In connection with this fact the author paid also attention to modelling behaviour of different types of soil in the process of analysing and designing. In the thesis the possible solutions enabling reduce the stresses in piles are also considered. The analysis of the structure is done with the help of two computer programs using Finite Element Method and with the help of simplified method. In the Swedish program named CONTRAM considered structure is analysed as a flat frame (two-dimensional model), in the program SOFiSTiK the bridge is modelled as a three-dimensional structure, however the simplified analysis concerned only the vertical piles loaded with a vertical axial force and subjected to lateral and rotational displacements at the pile top. The methods and models used are described and compared. Furthermore, rather an extensive review of available literature related to designing of integral bridges is included in the thesis. In the thesis technological solutions applied in integral abutment bridges and advantages (especially from economical point of view) and disadvantages of these structures are discussed. Examples of application of the integral abutment concept in a few countries, where the widest experience belongs to United States of America, are presented. Information about particular objects is at times rather poor with regard to not bad availability in the literature concerning the subject. The problems and uncertainties applied for designing integral bridges and the attempts of solving them are discussed. The methods and models available in the literature used for analysis of foundation piles subjected to mentioned influences were described. One of the models, beam on elastic foundation (or on Winkler’s foundation) is discussed more in detail because of the widespread usage of this model. Also in connection with this model, researches and analyses that had been carried out to define elasticity of different types of soil, which created the theoretical base concerning the considered subject are also presented.

Place, publisher, year, edition, pages
Keyword [en]
Technology, integral abutments, brobyggnad
Keyword [sv]
URN: urn:nbn:se:ltu:diva-51959ISRN: LTU-EX--05/248--SELocal ID: 91fdc996-dfa8-4c4d-830d-f4deaa5eaf65OAI: diva2:1025325
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

Open Access in DiVA

fulltext(1592 kB)0 downloads
File information
File name FULLTEXT01.pdfFile size 1592 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

ReferencesLink to record
Permanent link

Direct link