Modeling of Integral Abutment Bridges Considering Soil-structure Interaction Effects PDF Download
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Author: Daniel Michael Krier
Publisher:
ISBN:
Category : Soil-structure interaction
Languages : en
Pages : 372
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Book Description
Author: Daniel Michael Krier
Publisher:
ISBN:
Category : Soil-structure interaction
Languages : en
Pages : 372
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Book Description
Author: Karrthik Kirupakaran
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 384
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Ahmed Abdullah
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Integral abutment bridges (IABs) are monolithically rigid structures distinguished by eliminating the use of expansion and bearing joints. This leads to enhanced structural performance and reduced maintenance costs. However, the complex soil-structure interactions (SSI) of IABs in response to seasonal variations in ambient temperatures are not yet fully understood. This research aims to use comprehensive numerical models to expand the understanding related to the intricate SSIs of these structures in response to various conditions. The Middlesex bridge in Vermont, USA, was selected as a case study for this research. The thermal response of the bridge was monitored over a period of two years, in which the acting pressures, internal forces, and deformations were measured. The numerical research conducted in this study first involved the development of two- and three-dimensional finite element (FE) models using the software PLAXIS, where the corresponding findings were verified against field acquired measurements for a single case-study bridge. Parametric studies were then conducted to investigate the effects of varying the constitutive soil model, thermal loading, backfill stiffness, abutment stiffness, pile size and orientation, and span length on the resultant earth pressure distributions and pile bending moments. It was found that using a linear constitutive soil model resulted in significant inaccuracies in the results. It was also found that theoretically approximated abutment displacements obtained using the measured temperatures yielded similar results to the field measured deformations. They hence can be used for future performance predictions for climate change studies. The study also revealed that increasing the backfill stiffness was found to increase backfill stresses and decrease pile bending moments. It also showed that varying the abutment stiffness had no impact on the earth pressures and pile bending moments. Smaller pile sections oriented for weak-axis bending yielded smaller pile bending moments and larger earth pressures. Increasing the span length increased backfill stresses and pile bending moments.
Author: Yoon-Gi Min
Publisher:
ISBN:
Category :
Languages : en
Pages : 249
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Book Description
The term "Integral Abutment Bridges" is used broadly all over the world these days. While the expansion joints used in bridges were once a scientifically proved cure to the problem of natural expansion and contraction, there are the excessive maintenance costs being accumulated annually due to the deterioration of essential functions from deicing chemicals and debris. This drawback triggered the advent of Integral Abutment Bridges. The performance of Integral Abutment Bridges at almost no extra costs in seasonal and daily cyclic contraction and expansion can be assessed as a monumental landmark of civil engineering technologies with respect to the massive budget reductions. However, since Integral Abutment Bridges are destined to expand or contract under the laws of nature, the bridge design became more complicated and sophisticated in order to complement the removal of expansion joints. That is why numerous researchers are attracted to Integral Abutment Bridges with deep interests. Accordingly, in designing the piled abutments of Integral bridges, it is essential to precisely predict the bridge's behavior in advance. Researchers have been broadly carried out during the last several decades on the behavior of piled bridge abutments. However, most of the studies have been analyzed with focus on structural elements or soils, respectively for the static and dynamic loads such as thermal variations and earthquake loads. This presented research developed 3D numerical models with 3 m, 4 m, 5 m, 6 m, 7 m, and 8 m-tall abutments in the bridge using the finite element analysis software MIDAS CIVIL that simulate the behaviors of Integral Abutment Bridges to study the soil-structure interaction mechanism. In addition, this work evaluated and validated the suitability to the limit of the abutment height in Ontario's recommendations for Integral Abutment Bridges by a parametric study under the combined static loading conditions. In order to be a balanced research in terms of a multidisciplinary study, this research analyzed key facts and issues related to soil-structure interaction mechanisms with both structural and geotechnical concerns. Moreover, the study established an explanatory diagram on soil-structure interaction mechanisms by cyclic thermal movements in Integral Abutment Bridges.
Author: Reza Vasheghani Farahani
Publisher:
ISBN:
Category :
Languages : en
Pages : 124
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Book Description
Integral abutment bridges are jointless bridges in which the deck is continuous and connected monolithically with the abutment walls supported typically by a single row of piles. This thesis focuses on the effects of two major parameters on the seismic behavior of an integral abutment bridge in Tennessee by considering soil-structure interaction around the piles and in back of the abutments: (1) clay stiffness (medium vs. hard) around the piles, and (2) level of sand compaction (loose vs. dense) of the abutment wall backfilling. Modal and nonlinear time history analyses are performed on a three dimensional detailed bridge model using the commercial software SAP2000, which clearly show that (1) compacting the backfilling of the abutment wall will increase the bridge dominant longitudinal natural frequency considerably more than increasing the clay stiffness around the piles; (2) the maximum deflection and bending moment in the piles under seismic loading will happen at the pile-abutment interface; (3) under seismic loading, densely-compacted backfilling of the abutment wall is generally recommended since it will reduce the pile deflection, the abutment displacement, the moments in the steel girder, and particularly the pile moments; (4) under seismic loading, when the piles are located in firmer clay, although the pile deflection, the abutment displacement, and the maximum girder moment at the pier and the mid-span will decrease, the maximum pile moment and the maximum girder moment at the abutment will increase.
Author: George L. England
Publisher: Thomas Telford
ISBN: 9780727728456
Category : Technology & Engineering
Languages : en
Pages : 178
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Book Description
This work was commissioned by the Highways Agency to produce guidance for bridge designers by addressing the thermally induced soil/structure integration problem created by environmental changes of temperature and the associated cyclical displacements imposed on the granular backfill to the bridge abutments. It develops a better theoretical understanding of the cyclic performance, in particular the strain racheting in the backfill soil when in contact with a stiff structure. It also identifies the governing soil parameters and examines their influence in the interaction problem, develops numerical modelling procedures to predict interactive soil behaviour, and identifies and quantifies the controlling features of bridge structures relevant to the interaction problem.
Author: Esra Bayoǧlu Flener
Publisher:
ISBN:
Category :
Languages : en
Pages : 110
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Book Description
Author: Sami Arsoy
Publisher:
ISBN:
Category : Bridge approaches
Languages : en
Pages : 33
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Book Description
This report presents findings of a literature review, a field trip, and a finite element analysis pertaining to integral bridges. The purpose of the report is to identify problems and uncertainties, and to gain insight into the interactions between the foundation piles, the integral abutment, and the surrounding ground. The field trip included visits to six bridges arranged by Mr. Park Thompson from the Staunton district. Pertinent literature is reviewed and findings are presented. Important factors identified on the basis of this review are settlement of the approach fill, loads on the abutment piles, the nature of the abutment displacements and the associated earth pressure distribution, secondary loads on the superstructure, and soil structure interaction effects. The causes of approach fill settlement and possible mitigation techniques are discussed. Recommendations for improving the performance of integral bridges are included, and actions for improvement of integral bridge behavior are suggested.
Author: Sreevalsa Kolathayar
Publisher: Springer Nature
ISBN: 9811646171
Category : Science
Languages : en
Pages : 528
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Book Description
This book presents the select proceedings of the Virtual Conference on Disaster Risk Reduction (VCDRR 2021). It emphasizes on the role of civil engineering for a disaster-resilient society. It presents latest research in geohazards and their mitigation. Various topics covered in this book are earthquake hazard, seismic response of structures and earthquake risk. This book is a comprehensive volume on disaster risk reduction (DRR) and its management for a sustainable built environment. This book will be useful for the students, researchers, policy makers and professionals working in the area of civil engineering and earthquake engineering.
