Download or read book Load Capacity of Older Continuous Concrete Slab Bridges written by Srinivasa L. Iyer and published by . This book was released on 1987 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Load Capacity of Older Continuous Concrete Slab Bridges written by Srinivasa L. Iyer and published by . This book was released on 1985 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Load Distribution and Rating Assessment of Variable Depth Continuous Slab Bridges written by Ahmadudin Burhani and published by . This book was released on 2021 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many in-service reinforced concrete slab bridges in the United States have thicknesses that change along the span, leading to variation in flexural rigidity. Despite being commonly used, determining their live load carrying capacity has remained routinely uncertain. The variabilities are often ignored, and typical programs, such as AASHTOWare Bridge Rating (BrR), are used to assess such bridges’ structural capacity. In turn, this resulted in the entire analysis being subjected to erroneous results. Moreover, many of these structures are susceptible to weight restrictions due to shortened termination of reinforcements used in the negative moment regions. It is not always clear to which degree the reinforcement length affects such bridges’ structural capacity. It is also uncertain whether other parameters, such as bridge geometry, play role in improving the structural capacity. The objective of this study was to use experimental results and three-dimensional finite element simulations to assess the structural capacity of LOG-47-1184, a concrete highway bridge in Ohio that has four lanes and three consecutive spans of varying thickness and is subject to load restrictions. The study further provides an appropriate development length that satisfies different levels of section variability. The effect of the bridge’s geometry on the reinforcement was investigated. The experimental response of the bridge was determined, and results were used to calculate sets of load rating factors (LRFs) and to validate a three-dimensional finite element model (FEM). A detailed rating analysis found LRFs using the FEM were greater than those from Midas Civil, which in turn were greater than those from the legacy BrR program used by the Ohio Department of Transportation. The ratios of the BrR LRFs to the other procedure were generally constant across multiple test truck load configurations, with less than 4% variation for BrR/Midas Civil and about 25% for BrR/FEM. The LRFs from the FEM satisfied the operating checks and all LRFs exceeded one; therefore, no load restriction posting was required for the bridge. As a result, this study suggests that similar bridges that are susceptible to load restrictions based on the BrR outputs might have adequate structural capacity. Subsequently, it was found that the haunching increased force effects over intermediate supports, which in turn required longer development length. A total reasonable length was determined to be 4L/7, which can be extended on either side of intermediate supports. The FEM simulations underestimated AASHTO LRFD requirements by an average of 40%. Under HL-93 load configurations and using the LRFR approach, all LRFs exceeded one and satisfied the operating rating checks. The LRFs improved by 30% when the skew angle exceeded 15o as compared with 0o and reached 61% with the skew angle of 30o.
Download or read book Strength and Serviceability Criteria Reinforced Concrete Bridge Members Ultimate Design written by E. G. Paulet and published by . This book was released on 1969 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Continuous Concrete Bridges written by Portland Cement Association and published by . This book was released on 1939 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Procedure for Load Rating Reinforced Concrete Slab Bridges Without Plans written by Alain Michael Cuaron and published by . This book was released on 2016 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridges without plans are a problem in the state of New Mexico since standard bridge load rating techniques cannot be used due to the lack of design plans and documentation that contains the required information such as the amount and location of the reinforcement. A research project was conducted for the New Mexico Department of Transportation (NMDOT) to provide an effective method to load rate reinforced concrete slab bridges without plans using both structural analysis and non-destructive experimental techniques. This thesis presents the evaluation of two simple-span and two continuous-span reinforced concrete slab bridges. Bridge 8486 is a simple-span reinforced concrete slab bridge located in Albuquerque, NM. The bridge was built in 1984. According to the most current bridge inspection report for the bridge, the bridge had a satisfactory condition rating for the deck and superstructure and a good condition rating for the substructure. The bottom reinforcement layout was determined using a Hilti Ferroscan along with an AASHTO-based required steel area estimate while the material properties were determined based on the age of the bridge. The final load ratings from an AASHTOWare BrR analysis show that Bridge 8486 is capable of carrying an HS-20 vehicle safely. Bridge 8282 is a simple-span reinforced concrete slab that was built in 1976. The bridge is located in Albuquerque, NM. The bridge has a satisfactory condition rating for the deck and superstructure while the substructure was given a fair condition rating based on the most current bridge inspection report. The bottom reinforcement layout and material properties were estimated similarly to Bridge 8486. The final BrR load ratings show that the bridge has a load carrying capacity that can safely carry an HS-20 vehicle. Bridge 8827 is a three-span continuous reinforced concrete slab bridge. The bridge was built in 1991 in Albuquerque, NM. The deck, superstructure and substructure were given a fair condition rating in the most current bridge inspection report. Like Bridge 8486 and Bridge 8282, the bottom reinforcement was estimated using a Hilti Ferroscan, however, the scanner did not provide enough data to estimate the top reinforcement layout. Therefore, the top reinforcement layout was estimated using a combination of AASHTO, a top to bottom steel area ratio assumption (i.e., steel area for the top of the slab above the pier is 10% larger than the bottom steel area at midspan), and the Hilti Ferroscan results. Based on the final BrR load ratings, the bridge can carry an HS-20 vehicle safely. Bridge 7489 is a two-span continuous reinforced concrete slab bridge. The bridge was built in 1964 in Albuquerque, NM. The bridge had satisfactory condition ratings for the deck, superstructure, and substructure. The bottom and top reinforcement layout were estimated using the Hilti Ferroscan along with the required steel area estimation following AASHTO. The bridge load rating from BrR showed that the bridge could carry an HS-20 vehicle.
Download or read book Bridge Engineering Handbook written by Wai-Fah Chen and published by CRC Press. This book was released on 2014-01-24 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of this bestselling handbook covers virtually all the information an engineer would need to know about any type of bridge-from planning to construction to maintenance. It contains more than 2,500 tables, charts, and illustrations in a practical, ready-to-use format and an abundance of worked-out examples give readers numerous step-by-step design procedures. Extensively updated and featuring several new chapters, this volume, Construction and Maintenance, covers construction, inspection, bridge management systems, health monitoring, ratings, strengthening and rehabilitation, life cycle analysis and much more.
Download or read book Improved Load Rating of Reinforced Concrete Slab Bridges written by David Villegas Jãuregui and published by . This book was released on 2007 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reinforced Concrete Bridge Members written by United States. Bureau of Public Roads. Bridge Division and published by . This book was released on 1966 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Concrete International written by and published by . This book was released on 2004 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of a Load Test for the Evaluation and Rating of Short span Reinforced Concrete Slab Bridges written by Amy Eitel and published by . This book was released on 2002 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: There exists in the state of Ohio a large inventory of short span reinforced concrete bridges, particularly on rural secondary highways, whose actual structural reliability cannot be accurately ascertained. Quite often little or no documentation exists to assist the responsible local jurisdictions in assessing the ability of these bridges to safely carry modern truck loading.
Download or read book Strength Evaluation of Existing Reinforced Concrete Bridges written by Roy A. Imbsen and published by Transportation Research Board National Research. This book was released on 1987 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distribution of Wheel Loads and Design of Reinforced Concrete Bridge Floor Slabs written by H. R. Erps and published by . This book was released on 1937 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Higher Level Load Rating of a Reinforced Concrete Slab Bridge with Barriers written by Kundan Kulkarni and published by . This book was released on 2007 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Correlation of Bridge Load Capacity Estimates with Test Data written by Edwin G. Burdette and published by Transportation Research Board National Research. This book was released on 1988 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stress Distribution in a Continuous Reinforced concrete Bridge Slab Due to Concentrated Loads written by Walter Allen Ramey and published by . This book was released on 1954 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis of Load Capacity of Concrete Slabs Without Plans written by Richard A. Miller (Professional engineer) and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: To rate bridges, engineers need basic information about the bridge properties. For approximately 1200 slab bridges in Ohio, the original plans and specifications have been lost making it difficult to rate these bridges. A methodology for determining these critical properties for rating assessment is presented. The methodology uses a mixture of historical records, non-destructive testing and some limited destructive testing to find the properties. In general, the use of NDT techniques such as a rebound hammer and a magnetometer can provide information on concrete strength and reinforcing bar configurations. Determination of rebar strength is through historical record or by removing small specimens for testing.
