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Author: Brad Harold Sayers Publisher: ISBN: Category : Languages : en Pages : 518
Book Description
Integral-abutment bridges eliminate the expansion joints that are generally used to accommodate bridge length changes due to daily and annual temperature variations. Additional stresses and displacements due to the thermal loading are induced in these indeterminate structures that are not typically associated with bridge structures supported on pins and rollers. The goal of this research was to determine the effects of the thermal loading on two integral-abutment bridges. Extensive field monitoring was conducted on two, in-service, skewed, integral-abutment bridges located in central Iowa. The experimental program included long-term monitoring of longitudinal and transverse abutment displacements, relative displacements of the superstructure over the pier caps, strains in selected steel HP-shaped piles supporting the abutments, strains in several PC girders, bridge member temperatures, and end fixity of selected piles and girders in the abutments. The experimental temperature and displacement data was used to calibrate an ANSYS, finite-element model for each of the two monitored bridge structures. Experimental strains were verified and maximum strains due to the thermal loading were predicted for various members using the finite-element models.
Author: Brad Harold Sayers Publisher: ISBN: Category : Languages : en Pages : 518
Book Description
Integral-abutment bridges eliminate the expansion joints that are generally used to accommodate bridge length changes due to daily and annual temperature variations. Additional stresses and displacements due to the thermal loading are induced in these indeterminate structures that are not typically associated with bridge structures supported on pins and rollers. The goal of this research was to determine the effects of the thermal loading on two integral-abutment bridges. Extensive field monitoring was conducted on two, in-service, skewed, integral-abutment bridges located in central Iowa. The experimental program included long-term monitoring of longitudinal and transverse abutment displacements, relative displacements of the superstructure over the pier caps, strains in selected steel HP-shaped piles supporting the abutments, strains in several PC girders, bridge member temperatures, and end fixity of selected piles and girders in the abutments. The experimental temperature and displacement data was used to calibrate an ANSYS, finite-element model for each of the two monitored bridge structures. Experimental strains were verified and maximum strains due to the thermal loading were predicted for various members using the finite-element models.
Author: Sami Arsoy Publisher: ISBN: Category : Bridges Languages : en Pages : 55
Book Description
This research investigated, through experimental and analytical studies, the complex interactions that take place between the structural components of an integral bridge and the adjoining soil. The ability of piles and abutments to withstand thermally induced cyclic loads was investigated by conducting large-scale cyclic load tests. Three pile types and three integral abutments with hinges were tested in the laboratory. Experiments simulated 75 years of bridge life. Numerical analyses were conducted to analyze the interactions among the abutment, the approach fill, the foundation soil, and the foundation piles. The results indicated that H-piles are most suitable for supporting integral abutments. Concrete piles and pipe piles were too stiff in response to repeated lateral loads, resulting in tension cracks at the connection with the abutment. Further, a hinge in the integral abutment effectively reduces pile stresses by absorbing some of the rotational movement.
Author: Mohiuddin Ali Khan Publisher: Butterworth-Heinemann ISBN: 9780128031247 Category : Technology & Engineering Languages : en Pages : 512
Book Description
Although integral abutments bridges have been used successfully for 50 years, there are no uniform standards or policies regarding permissible bridge lengths, skews, details or design procedures. Their implementation is not an exact science, but rather a matter of intuition, experimentation and observation. Analysis and Design of Integral Abutment Bridges five-part treatment starts with a clear and rigorous with the types of Integral Abutment Bridges their common problems and code applications. This is quickly followed by applications for analytical methods and computer software including Lateral Load Analysis Techniques and Nonlinear Analysis of Integral Abutment Bridges. Next, the third part on the Methods of Design and Structural Details includes Foundations, Backfill and a section on Beam Design including steel, cast-in-place concrete beams and precast/prestressed concrete beams. With this book in hand, structural and bridge engineers will find a brief and valuable guide illustrating how these concepts are successfully applied in the real world. The latest published results on experimental, analytical, and field studies on the behaviour of integral abutment bridges and their components Unified guidelines based on activities such as the AASHTO/NCHRP joint taskforce, LRFD specs and FHWA-sponsored research study on Jointless Bridges The book contains sufficient coverage of the most critical behavioural aspects of integral abutment bridges, namely: Interaction between the foundation piles, the integral abutment, and the surrounding ground under cyclic loading due to temperature effects, dynamic earthquake loading, and shrinkage/creep Abutment displacements and associated earth pressure distribution Settlement of the approach fill
Author: Matthew Earl Thomas Publisher: ISBN: Category : Languages : en Pages : 256
Book Description
The experimental investigation consisted of determining longitudinal and transverse abutment movements, strains in H-shaped steel piles, strains in prestressed concrete girders, temperature distributions, and the fixity of the piles and girders in the abutment. Data was collected to measure effects of daily and seasonal temperature variations. A large volume of data was collected and analyzed. Preliminary results show that the bridges are performing satisfactorily with no sign of distress. In addition to providing experimental evidence of the behavior of the two bridges, the data will be used to calibrate analytical models in subsequent research to be conducted on these bridges.
Author: U. S. Department Transportation Publisher: CreateSpace ISBN: 9781484198179 Category : Languages : en Pages : 168
Book Description
This report presents the results of a pilot study on the seismic behavior and response of steel bridges with integral abutments. Analytical investigations were conducted on computational models of steel bridges with integral abutments to determine their seismic behavior as a system and to develop seismic design guidelines. The effect of the superstructure flexibility due to inadequate embedment length was investigated using 3D finite element models. This flexibility, modeled as translational and rotational springs, proved to have significant effect on the overall bridge dynamic characteristics in terms of periods and critical mode shapes. Lateral and longitudinal load paths and the seismic response were investigated using modal pushover and nonlinear time history analyses. A limited investigation on the effect of skew was conducted on a single-span integral abutment bridge. A procedure for incorporating the system level damping due to the yielding and inelastic responses of various components was proposed for use in the seismic analysis. Based on the analytical investigations and available experimental research, guidelines for the seismic analysis and design of integral abutment bridges were developed.
Author: George L. England Publisher: Thomas Telford ISBN: 9780727728456 Category : Technology & Engineering Languages : en Pages : 178
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: Murad Abu-Farsakh Publisher: Springer ISBN: 3319616420 Category : Science Languages : en Pages : 314
Book Description
This volume on “Advances in Analysis and Design of Deep Foundations” contains 22 technical papers which cover various aspects of analysis and design of deep foundations based on full-scale field testing, numerical modeling, and analytical solutions. The technical papers are 8-10 pages long that present the results and findings from research as well as practical-oriented studies on deep foundations that are of interest to civil/geotechnical engineering community. The topics cover a wide spectrum of applications that include evaluation of the axial and lateral capacity of piles, pile group effects, evaluation of the increase in pile capacity with time (or pile setup), influence of excavation on pile capacity, study the behavior of pile raft caisson foundations, evaluate the bearing capacity and settlement of piles from cone penetration tests, etc. This volume is part of the proceedings of the 1st GeoMEast International Congress and Exhibition on Sustainable Civil Infrastructures, Egypt 2017.
Author: Brad Harold Sayers
Author: Brad Harold Sayers
Author: Sami Arsoy
Author: Yasser A. Khodair
Author: Mohiuddin Ali Khan
Author: Matthew Earl Thomas
Author: U. S. Department Transportation
Author: George L. England
Author: David Jonathan Knickerbocker
Author: 
Author: Murad Abu-Farsakh