A Field Installation Using Prestressed Panel Subdecks 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 A Field Installation Using Prestressed Panel Subdecks PDF full book. Access full book title A Field Installation Using Prestressed Panel Subdecks by Marvin Henry Hilton. Download full books in PDF and EPUB format.
Author: Marvin Henry Hilton
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 13
Get Book Here
Book Description
This final report is a supplement to an earlier report that covered the installation of the first precast, prestressed panel subdecks installed on a bridge in Virginia. The report discusses the inspection of the decks one year after they were completed and the relative ease of construction using the precast subdeck technique as opposed to permanent steel forms and conventional timber forming. Estimates of the relative costs between the three types of forming and consideration of the speed of construction suggest that the precast subdeck technique can reduce superstructure costs and save time and labor during construction. The original bridge design incorporated epoxy-coated reinforcing steel in the cast-in-place upper portion of the decks. This provision was made to protect the reinforcing steel against the intrusion of chlorides since the deck was expected to crack over some of the joints between the subdeck panels. Hairline cracking was observed on some of the decks above the joints between the subdeck-panels. There was no definite pattern to the cracking in some of the other spans, but this may have been due to lack of traffic loading on all but one lane of the twin bridges at the time of the final inspection. While similar cracking is often found in conventionally constructed decks, the joints between the subdeck panels appear to control the location of cracking that might otherwise occur at random locations. It was recommended that the precast subdeck panels technique be considered as a viable alternative for use in the design and construction of bridge decks.
Author: Marvin Henry Hilton
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 13
Get Book Here
Book Description
This final report is a supplement to an earlier report that covered the installation of the first precast, prestressed panel subdecks installed on a bridge in Virginia. The report discusses the inspection of the decks one year after they were completed and the relative ease of construction using the precast subdeck technique as opposed to permanent steel forms and conventional timber forming. Estimates of the relative costs between the three types of forming and consideration of the speed of construction suggest that the precast subdeck technique can reduce superstructure costs and save time and labor during construction. The original bridge design incorporated epoxy-coated reinforcing steel in the cast-in-place upper portion of the decks. This provision was made to protect the reinforcing steel against the intrusion of chlorides since the deck was expected to crack over some of the joints between the subdeck panels. Hairline cracking was observed on some of the decks above the joints between the subdeck-panels. There was no definite pattern to the cracking in some of the other spans, but this may have been due to lack of traffic loading on all but one lane of the twin bridges at the time of the final inspection. While similar cracking is often found in conventionally constructed decks, the joints between the subdeck panels appear to control the location of cracking that might otherwise occur at random locations. It was recommended that the precast subdeck panels technique be considered as a viable alternative for use in the design and construction of bridge decks.
Author: Marvin Henry Hilton
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 21
Get Book Here
Book Description
This report is concerned with the field installation of prestressed panel subdecks on the Rte 220 bridges over relocated 23rd St. in the city of Roanoke. These were the first bridges to be constructed in Virginia utilizing the precast subdeck panel construction technique. The field study was conducted as a follow-up to the original study which resulted in the recommendation to install the panels on a bridge on an experimental basis and record any problems occurring during the installation and further to offer suggestions for the possible improvement of the technique. Details regarding the general features of the prestressed panels used on the Rte 220 bridges are given in the report. Based on observations made during the installation of the panels, certain recommendations are offered.
Author: Robert E. Abendroth
Publisher:
ISBN:
Category :
Languages : en
Pages : 74
Get Book Here
Book Description
Precast prestressed concrete panels have been used in bridge deck construction in Iowa and many other states. To investigate the performance of these panels at abutment or pier diaphragm locations for bridges with various skew angles, a research program involving both analytical and experimental aspects, is being conducted. This interim report presents the status of the research with respect to four tasks. Task 1 which involves a literature review and two surveys is essentially complete. Task 2 which involved field investigations of three Iowa bridges containing precast panel subdecks has been completed. Based on the findings of these investigations, future inspections are recommended to evaluate potential panel deterioration due to possible corrosion of the prestressed strands. Task 3 is the experimental program which has been established to monitor the behavior of five configurations of full scale composite deck slabs. Three dimensional test and instrumentation frameworks have been constructed to load and monitor the slab specimens. The first slab configuration representing an interior panel condition is being tested and preliminary results are presented for one of these tests in this interim report. Task 4 involves the analytical investigation of the experimental specimens. Finite element methods are being applied to analytically predict the behavior of the test specimens. The first slab configuration representing an interior panel condition is being tested and preliminary results are presented for one of these tests in this interim report. Task 4 involves the analytical investigation of the experimental specimens. Finite element methods are being applied to analytically predict the behavior of the test specimens. The first test configuration of the interior panel condition has been analyzed for the same loads used in the laboratory, and the results are presented herein. Very good correlation between the analytical and experimental results has occurred.
Author: Marvin Henry Hilton
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 17
Get Book Here
Book Description
The results of prior research conducted on precast prestressed panel subdecks for use in the construction of bridge decks are reviewed and summarized. This construction technique utilizes the precast panel subdecks as the forming for the cast-in-place upper portion of the deck. After placement of the upper portion of the deck the panels become an integral part of the deck thickness. The placement and removal of wooden type formwork are thus eliminated and the construction time and safety hazards normally experienced during form removal are thereby reduced. The field experience and research results to date indicate the technique to be reliable. Some hairline cracking can be expected to occur on the cast-in-place deck directly above the joints between prestressed panels. Cores from the bridge decks show that the cracking does not penetrate the full depth of the upper slab and is not considered detrimental to the structural integrity of the deck. It was recommended that Virginia adopt the innovation on a trial basis to gain experience with the technique.
Author: National Cooperative Highway Research Program
Publisher: Transportation Research Board
ISBN:
Category : Roads
Languages : en
Pages : 29
Get Book Here
Book Description
Author: Harry T. Craft
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 428
Get Book Here
Book Description
Author: Michael M. Sprinkel
Publisher: Transportation Research Board National Research
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 88
Get Book Here
Book Description
This synthesis will be of interest to bridge designers, maintenance and construction personnel, and others concerned with the design, maintenance, and rehabilitation of bridges. Information is presented on the use of prefabricated elements that can be used to construct new bridges or rehabilitate old ones.
Author: Prestressed Concrete Institute
Publisher:
ISBN:
Category : Prestressed concrete
Languages : en
Pages : 838
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 562
Get Book Here
Book Description
Author: R.E. Abendroth
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 218
Get Book Here
Book Description
Precast prestressed concrete panels have been used as subdecks in bridge construction in Iowa and other states. To investigate the performance of these types of composite slabs at locations adjacent to abutment and pier diaphragms in skewed bridges, a research project which involved surveys of design agencies and precast producers, field inspections of existing bridges, analytical studies, and experimental testing was conducted. The survey results from the design agencies and panel producers showed that standardization of precast panel construction would be desirable, that additional inspections at the precast plant and at the bridge site would be beneficial, and that some form of economical study should be undertaken to determine actual cost savings associated with composite slab construction. Three bridges in Hardin County, Iowa were inspected to observe general geometric relationships, construction details, and to note the visual condition of the bridges. Hairline cracks beneath several of the prestressing strands in many of the precast panels were observed, and a slight discoloration of the concrete was seen beneath most of the strands. Also, some rust staining was visible at isolated locations on several panels. Based on the findings of these inspections, future inspections are recommended to monitor the condition of these and other bridges constructed with precast panel subdecks. Five full-scale composite slab specimens were constructed in the Structural Engineering Laboratory at Iowa State University. One specimen modeled bridge deck conditions which are not adjacent to abutment or pier diaphragms, and the other four specimens represented the geometric conditions which occur for skewed diaphragms of 0, 15, 30, and 40 degrees. The specimens were subjected to wheel loads of service and factored level magnitudes at many locations on the slab surface and to concentrated loads which produced failure of the composite slab. The measured slab deflections and bending strains at both service and factored load levels compared reasonably well with the results predicted by simplified Finite element analyses of the specimens. To analytically evaluate the nominal strength for a composite slab specimen, yield-line and punching shear theories were applied. Yield-line limit loads were computed using the crack patterns generated during an ultimate strength test. In most cases, these analyses indicated that the failure mode was not flexural. Since the punching shear limit loads in most instances were close to the failure loads, and since the failure surfaces immediately adjacent to the wheel load footprint appeared to be a truncated prism shape, the probable failure mode for all of the specimens was punching shear. The development lengths for the prestressing strands in the rectangular and trapezoidal shaped panels was qualitatively investigated by monitoring strand slippage at the ends of selected prestressing strands. The initial strand transfer length was established experimentally by monitoring concrete strains during strand detensioning, and this length was verified analytically by a finite element analysis. Even though the computed strand embedment lengths in the panels were not sufficient to fully develop the ultimate strand stress, sufficient stab strength existed. Composite behavior for the slab specimens was evaluated by monitoring slippage between a panel and the topping slab and by computation of the difference in the flexural strains between the top of the precast panel and the underside of the topping slab at various locations. Prior to the failure of a composite slab specimen, a localized loss of composite behavior was detected. The static load strength performance of the composite slab specimens significantly exceeded the design load requirements. Even with skew angles of up to 40 degrees, the nominal strength of the slabs did not appear to be affected when the ultimate strength test load was positioned on the portion of each slab containing the trapezoidal-shaped panel. At service and factored level loads, the joint between precast panels did not appear to influence the load distribution along the length of the specimens. Based on the static load strength of the composite slab specimens, the continued use of precast panels as subdecks in bridge deck construction is recommended.
