Design Recommendations for High Skew Link Slabs PDF Download
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Author: Michael A. Romkema
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 240
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Book Description
This study investigates the behavior of link-slab bridges under various angles of skew, boundary conditions, and loading through the development of 60 three-dimensional, finite element bridge models. Models are generated for angles of skew of 0°, 20°, 30° , and 45°. In addition, the models are analyzed under three different boundary conditions. Loads are then applied to the models: positive and negative temperature gradients and three live load patterns, representative of the American Association of State Highway and Transportation Officers (AASHTO) HL-93 loading. The models are analyzed in Abaqus. Accuracy of the analysis models are confirmed with equilibrium, element quality checks, and other visual checks using the pre/post-processor HyperMesh. Trends are then developed as to how forces and moments within the link slab change based on the angle of skew and boundary conditions. Finally, a skew link slab design procedure is proposed.
Author: Michael A. Romkema
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 240
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Book Description
This study investigates the behavior of link-slab bridges under various angles of skew, boundary conditions, and loading through the development of 60 three-dimensional, finite element bridge models. Models are generated for angles of skew of 0°, 20°, 30° , and 45°. In addition, the models are analyzed under three different boundary conditions. Loads are then applied to the models: positive and negative temperature gradients and three live load patterns, representative of the American Association of State Highway and Transportation Officers (AASHTO) HL-93 loading. The models are analyzed in Abaqus. Accuracy of the analysis models are confirmed with equilibrium, element quality checks, and other visual checks using the pre/post-processor HyperMesh. Trends are then developed as to how forces and moments within the link slab change based on the angle of skew and boundary conditions. Finally, a skew link slab design procedure is proposed.
Author: Haluk Aktan
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 0
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Book Description
A new bridge design and construction trend to help improve durability and rideability is to remove expansion joints over piers and abutments. One approach to achieve this is to make the deck continuous over the piers by means of a link slab while the girders remain simply supported. The need to implement link slabs is indicated by AASHTO LRFD section 2.5.2.4 which requires using a minimum number of expansion joints to improve rideability. Further, due to durability concerns associated with bridge deck joints, it is preferred to have a least number of joints or develop jointless decks. The expansion joints over the abutments can be removed by one of three methods: deck sliding over back wall, semi-integral abutments, and integral abutments. This results in expansion joints at either or both ends of the approaches. The design concerns other than link slab include backwall and wing-wall design and bearing movement. The behavior of a jointless bridge brings about many challenges to bridge designers. The complexity is augmented when skew is involved. This report complements an earlier report based on previous research on Combining Link Slab, Deck Sliding Over Backwall and Revising Bearings (Aktan et al., 2008) where the behavior of straight and moderately skew (skew 200) link slab bridges were investigated and design recommendations were developed. This report describes the behavior and performance of high skew (skew 200) jointless bridges with link slabs and two abutment configurations. These abutment configurations are deck sliding over backwall and backwall sliding over abutments (i.e. semi-integral abutments). Four tasks were performed in this project. The first task was to review and synthesize information related to the behavior, performance, design, and analysis of skew bridges. The second task was field assessment of skew bridge behavior under static truck loads and thermal loads. The third task was analytical and numerical analysis of skew link slabs. The final task was analytical and numerical analysis of skew sliding deck over backwall systems and semi-integral abutments. Design recommendations are developed based on literature, field assessment data analysis, finite element modeling, and subsequent simulations of the numerous models developed in this project. One recommendation deals with the skew link slab design and the remaining recommendations are for bearing selection and selection and design of a transverse restraint system at abutments of skew link slab bridges.
Author: Fabio Biondini
Publisher: CRC Press
ISBN: 0203103386
Category : Technology & Engineering
Languages : en
Pages : 4119
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Book Description
Bridge Maintenance, Safety, Management, Resilience and Sustainability contains the lectures and papers presented at The Sixth International Conference on Bridge Maintenance, Safety and Management (IABMAS 2012), held in Stresa, Lake Maggiore, Italy, 8-12 July, 2012. This volume consists of a book of extended abstracts (800 pp) Extensive collection of revised expert papers on recent advances in bridge maintenance, safety, management and life-cycle performance, representing a major contribution to the knowledge base of all areas of the field.
Author: N. M. Mitchell
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309022339
Category : Technology & Engineering
Languages : en
Pages : 53
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Book Description
Many factors affect the amount of temperature-induced movement that occurs in a building and the extent to which this movement can occur before serious damage develops or extensive maintenance is required. In some cases joints are being omitted where they are needed, creating a risk of structural failures or causing unnecessary operations and maintenance costs. In other cases, expansion joints are being used where they are not required, increasing the initial cost of construction and creating space utilization problems. As of 1974, there were no nationally acceptable procedures for precise determination of the size and the location of expansion joints in buildings. Most designers and federal construction agencies individually adopted and developed guidelines based on experience and rough calculations leading to significant differences in the various guidelines used for locating and sizing expansion joints. In response to this complex problem, Expansion Joints in Buildings: Technical Report No. 65 provides federal agencies with practical procedures for evaluating the need for through-building expansion joints in structural framing systems. The report offers guidelines and criteria to standardize the practice of expansion joints in buildings and decrease problems associated with the misuse of expansions joints. Expansions Joints in Buildings: Technical Report No. 65 also makes notable recommendations concerning expansion, isolation, joints, and the manner in which they permit separate segments of the structural frame to expand and to contract in response to temperature fluctuations without adversely affecting the buildings structural integrity or serviceability.
Author:
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 844
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Book Description
Author: Robert J. Frosch
Publisher: Joint Transportation Research Program
ISBN: 9781622600120
Category :
Languages : en
Pages : 149
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Book Description
Integral abutment (IA) construction has become the preferred method over conventional construction for use with typical highway bridges. However, the use of these structures is limited due to state mandated length and skew limitations. To expand their applicability, studies were implemented to define limitations supported by rational analysis rather than simply engineering judgment. Previous research investigations have resulted in larger length limits and an overall better understanding of these structures. However, questions still remain regarding IA behavior; specifically questions regarding long-term behavior and effects of skew. To better define the behavior of these structures, a study was implemented to specifically investigate the long term behavior of IA bridges. First, a field monitoring program was implemented to observe and understand the in-service behavior of three integral abutment bridges. The results of the field investigation were used to develop and calibrate analytical models that adequately capture the long-term behavior. Second, a single-span, quarter-scale integral abutment bridge was constructed and tested to provide insight on the behavior of highly skewed structures. From the acquired knowledge from both the field and laboratory investigations, a parametric analysis was conducted to characterize the effects of a broad range of parameters on the behavior of integral abutment bridges. This study develops an improved understanding of the overall behavior of IA bridges. Based on the results of this study, modified length and skew limitations for integral abutment bridge are proposed. In addition, modeling recommendations and guidelines have been developed to aid designers and facilitate the increased use of integral abutment bridges.
Author:
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 836
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Book Description
Author: E C Hambly
Publisher: CRC Press
ISBN: 1482267160
Category : Architecture
Languages : en
Pages : 334
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Book Description
This book describes the underlying behaviour of steel and concrete bridge decks. It shows how complex structures can be analysed with physical reasoning and relatively simple computer models and without complicated mathematics.
Author: Hany Shehata
Publisher: Springer Nature
ISBN: 3030625869
Category : Technology & Engineering
Languages : en
Pages : 225
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Book Description
This book includes a collection of research and practical papers from international research and technology activities on recent developments in infrastructure engineering. Sustainability is increasingly a key priority in engineering practices. With the aging transportation infrastructure and renewed emphasis on infrastructure renovation by transportation agencies, innovations are urgently needed to develop materials, designs, and practices to ensure the sustainability of transportation infrastructure.
