Effects of Thermal Expansion on a Skewed Semi-integral Bridge PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Effects of Thermal Expansion on a Skewed Semi-integral Bridge PDF full book. Access full book title Effects of Thermal Expansion on a Skewed Semi-integral Bridge by Christopher L. Bettinger. Download full books in PDF and EPUB format.
Author: Christopher L. Bettinger
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 298
Get Book Here
Book Description
Author: Christopher L. Bettinger
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 298
Get Book Here
Book Description
Author: Eric P. Steinberg
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 87
Get Book Here
Book Description
Jointless bridges, such as semi-integral and integral bridges, have become more popular in recent years because of their simplicity in the construction and the elimination of high costs related to joint maintenance. Prior research has shown that skewed semi-integral bridges tend to expand and rotate as the ambient air temperature increases through the season. As a result of the bridge movement, forces are generated and transferred to the wingwalls of the bridge. ODOT does not currently have a procedure to determine the forces generated in the wingwalls from the thermal expansion and rotation of skewed semi-integral bridges. In this study, two semi-integral bridges with skews were instrumented and monitored for behavior at the interface of the bridge's diaphragm and wingwall. A parametric analysis was also performed to determine the effects of different spans and bridge lengths on he magnitude of the forces. Based on the field results from the study it is recommended for the design of the wingwalls turned to run nearly parallel with the longitudinal axis of skewed semi-integral bridges should include a 100 psi loading at the wingwall/diaphragm interface from the thermal expansion of the bridge. In addition, analytical evaluations showed that longer spans and higher skews than allowed by ODOT's BDM could be used. However, additional considerations for larger movements and stresses generated at the wingwall/diaphragm interface would need to be considered in designs. Finally, bearing retainers in diaphragms, if used, require adequate cover to avoid spalling of concrete.
Author: Eric P. Steinberg
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 4
Get Book Here
Book Description
Bridges that utilize expansion joints have an overall higher maintenance cost due to leakage at the expansion joint leading to deterioration of the joint, as well as structural components beneath the joint including the superstructure and substructure. Jointless bridges, such as semi-integral and integral bridges, have become more popular in recent years because of their simplicity in the construction and the elimination of expansion joints. Jointless bridges also improve riding quality, promote lower impact loads, reduce snowplow damage to decks and approach slabs, as well as improve the seismic resistance of the bridge.
Author: Joshua S. Lucas
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages :
Get Book Here
Book Description
In recent years jointless bridges have become more common and issues associated with these bridges are starting to develop. Past research has shown that as skewed bridges change temperature, additional lateral movement or forces will occur along with the elongation of the bridge. Even though past research has documented this behavior, lateral movements associated with semi-integral bridge superstructure has not been well predicted. When larger skew angles and longer bridge spans are used, even more movement could be expected.
Author: Eric P. Steinberg
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 90
Get Book Here
Book Description
In the state of Ohio, semi-integral bridges have become more popular because these bridges eliminate high maintenance joints. The girders in a semi-integral bridge are encased in a diaphragm supported on elastomeric pads that bear on the abutment. Movement of the diaphragm caused by thermal change is theoretically resisted by backfill and also by the wingwalls for skewed bridges. The wingwalls are subjected to forces as a skewed bridge rotates during thermal expansion.
Author: Bhavik R. Shah
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 190
Get Book Here
Book Description
Integral Bridges (IBs) are joint-less bridges whereby the deck is continuous and monolithic with abutment walls. IBs are outperforming their non-integral counterparts in economy and safety. Their principal advantages are derived from the absence of expansion joints and sliding bearings in the deck, making them the most cost-effective system in terms of construction, maintenance, and longevity. The main purpose of constructing IBs is to prevent the corrosion of structure due to water seepage through joints. The simple and rapid construction provides smooth, uninterrupted deck that is aesthetically pleasing and safer for riding. The single structural unit increases the degree of redundancy enabling higher resistance to extreme events. However, the design of IBs not being an exact science poses certain critical issues. The continuity achieved by this construction results in thermally induced deformations. These in turn introduce a significantly complex and nonlinear soil-structure interaction into the response of abutment walls and piles of the lB. The unknown soil response and its effect on the stresses in the bridge, creates uncertainties in the design. To gain a better understanding of the mechanism of load transfer due to thermal expansion, which is also dependent on the type of the soil adjacent to the abutment walls and piles, a 3D finite element analysis is carried out on a representative IB using state-of-the-art finite element code ABAQUS/Standard 6.5-1. A literature review focusing on past numerical studies of IBs is presented, followed by details of the numerical model developed in this study using the interactive environment ABAQUS/CAE 6.5-1 along with the analysis details. A discussion of results of the analysis of the IB with three different soil conditions, each experiencing three different temperature change scenarios is presented. Conclusions of the study and recommendations for future research wrap up the report. The advancement of knowledge enabled by this research will provide a basis for introduction of new guidelines in Kansas Bridge Design Manual.
Author: Laura Marie Ryan
Publisher:
ISBN:
Category :
Languages : en
Pages : 126
Get Book Here
Book Description
Author: Edward J. Hoppe
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 0
Get Book Here
Book Description
The purpose of this study was to conduct a field evaluation of a highly skewed semi integral bridge in order to provide feedback regarding some of the assumptions behind the design guidelines developed by the Virginia Department of Transportation. The project was focused on the long term monitoring of a bridge on Route 18 over the Blue Spring Run in Alleghany County, Virginia. The 110 ft long, one span bridge was constructed at a 45 degree skew and with no approach slabs. It incorporated an elasticized expanded polystyrene material at the back of the integral backwall. Bridge data reflecting thermally induced displacements, loads, earth pressures, and pile strains were acquired at hourly intervals over a period of approximately 5 years. Approach elevations were also monitored. Analysis of data was used to formulate design recommendations for integral bridges in Virginia. Field results indicated that semi integral bridges can perform satisfactorily at a 45 degree skew provided some design details are modified. The relatively high skew angle resulted in a pronounced tendency of the semi integral superstructure to rotate in the horizontal plane. This rotation can generate higher than anticipated horizontal earth pressure acting on the abutment wingwall. Study recommendations include modifying the structural detail of the backwall wingwall interface to mitigate crack formation and placing the load buttress close to the acute corner of a highly skewed abutment to reduce the abutment horizontal rotation. The use of elastic inclusion at the back of the semi integral backwall resulted in the reduction of earth pressures and negligible approach settlements. The study recommendations include proposed horizontal earth pressure coefficients for design and a revised approach to calculating the required thickness of the elastic inclusion. While recommending that the existing VDOT guidelines allow an increase in the allowable skew angle from 30 degree to 45 degree for semi integral bridges, the study also proposes a field investigation of the maximum skew angle for fully integral bridges because of the inherently low stiffness associated with a single row of foundation piles. The study indicates that current VDOT guidelines can be relaxed to allow design of a wider range of jointless bridges. The implementation of integral design has been shown to reduce bridge lifetime costs because of the elimination of deck joints, which often create numerous maintenance problems.
Author: Andrew T. Metzger
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 428
Get Book Here
Book Description
Author: Bryce Robert Hanlon
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 336
Get Book Here
Book Description
