Longitudinal Seismic Response of Bridge Frames Connected by Restrainers PDF Download
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Author: Yueh-Shiun Yang
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 112
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Book Description
Author: Yueh-Shiun Yang
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 112
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: AG. Vlassis
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 10
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Book Description
A specimen consisting of two box girder reinforced concrete blocks representing the adjacent spans of a reference bridge at an in-span hinge was constructed and tested under incrementally increasing input excitation to investigate the impact between adjacent bridge spans at in-span hinges, to evaluate the efficacy of restrainers in reducing relative displacements across the hinges, and to examine the effects of restrainer stiffness and gap on the response of the hinge-restrainer system. Cable restrainers were used to connect the two blocks, the number and gap of which were varied during the experiments. The experimental results indicated that impacts between the adjacent frames produce acceleration levels significantly higher than what is typically assumed in design. In all the restrained system cases, restrainers were capable of reducing hinge relative displacements and preventing span unseating. However, restrainer yielding occurred under strong input motions, especially when the restrainer gap was set to zero.
Author: Kosalram Krishnan
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 392
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Book Description
Author: Andreas J Kappos
Publisher: Springer Science & Business Media
ISBN: 9400739435
Category : Technology & Engineering
Languages : en
Pages : 233
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Book Description
The book focuses on the use of inelastic analysis methods for the seismic assessment and design of bridges, for which the work carried out so far, albeit interesting and useful, is nevertheless clearly less than that for buildings. Although some valuable literature on the subject is currently available, the most advanced inelastic analysis methods that emerged during the last decade are currently found only in the specialised research-oriented literature, such as technical journals and conference proceedings. Hence the key objective of this book is two-fold, first to present all important methods belonging to the aforementioned category in a uniform and sufficient for their understanding and implementation length, and to provide also a critical perspective on them by including selected case-studies wherein more than one methods are applied to a specific bridge and by offering some critical comments on the limitations of the individual methods and on their relative efficiency. The book should be a valuable tool for both researchers and practicing engineers dealing with seismic design and assessment of bridges, by both making the methods and the analytical tools available for their implementation, and by assisting them to select the method that best suits the individual bridge projects that each engineer and/or researcher faces.
Author: Satinder Pal Singh
Publisher:
ISBN:
Category :
Languages : en
Pages : 526
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Book Description
Author: Alireza Mohebbi
Publisher:
ISBN:
Category : Electronic books
Languages : en
Pages : 178
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Book Description
Previous research and experience demonstrates that post-earthquake downtime can cripple the transportation network, damage the economic viability of the region, and possibly have more far-reaching consequences due to the trickle down effects. Thus, the current bridge research addresses not only life safety, but also continued operation after earthquakes. A new strategy for seismic protection of bridge piers is proposed that uses sliding bearings as structural fuses that can capacity protect the pier columns and limit their response to the linear elastic range. The strategy was applicable to bridges with dropped bent cap, and integral and semi-integral abutments. In this study, the influence of the structural fuses on the seismic response of a representative 3-span highway bridge with 3 column piers and integral abutments was investigated. Utilizing OpenSees software, the bridge was modeled with and without structural fuses, and the model included the effect of soil interaction at the abutments. Two different types of analysis were applied to the model: (1) static pushover analysis to determine the elastic capacity and the nonlinear behavior of bridge components such as columns, piles, and abutments in both the longitudinal and transverse directions, and (2) nonlinear response history analysis to compare the seismic responses of the bridge components with and without structural fuses. Nonlinear response history analysis was performed on the model for a suite of 20 ground motions scaled to 100%, 150%, and 200% of the design spectrum. Six different friction coefficients (2%, 6%, 9%, 14%, 18%, and 22%) of the structural fuses were considered to evaluate the influence of friction coefficient on the bridge and abutment responses. Results showed that the structural fuses constrained the columns to linear elastic response in both the longitudinal and transverse direction. Furthermore, the abutment ductility demand in the fused bridge was nearly identical to that of the conventional bridge and insensitive to the friction coefficient in both the longitudinal and transverse directions. This case study demonstrated that structural fuses have the potential to improve the seismic performance of bridges by eliminating plastic hinging and associated damage in pier columns without significant changes to the abutment displacement demands.
Author: Jill Kathleen Patty
Publisher:
ISBN:
Category :
Languages : en
Pages : 810
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Book Description
Author: Laura N. Lowes
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 180
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Book Description
A series of experimental tests investigating the seismic response of reinforced concrete beam-column T-joints was recently completed at the University of California, Berkeley. The evaluated connection was representative of an interior beam- column joint from a multi-column bridge frame built in the late 1950's. Three one-third scale models, representing the as-built connection and two retrofit connections, were tested. The results of this research project are an improved understanding of the seismic behavior of lightly reinforced bridge T-joints as well as verification of a design procedure for retrofitting this type of connection.
Author: Bassem Onsi Andrawes
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages :
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Book Description
The feasibility of using superelastic shape memory alloys in the retrofit of multiple frame bridges is investigated. First, three shape memory alloy constitutive models with various levels of complexity are compared in order to determine the significance of including subloops and cyclic loading effects on the structural response. The results show that the structural response is more sensitive to the shape memory alloys strength degradation and residual deformation than the sublooping behavior. Next, two parametric studies are conducted to explore the sensitivity of hinge opening to the mechanical behavior of the superelastic shape memory alloys. The first study is focused on the hysteretic properties of the alloy that could vary depending on the chemical composition or the manufacturing process of the alloy, while the second study targets the changes in the mechanical behavior of shape memory alloys resulting from the variability in the ambient temperature. The results show that the hysteretic behavior of shape memory alloys has only a slight effect on the bridge hinge opening as long as the recentering property is maintained. A detailed study on the effect of temperature shows that a reduction in the ambient temperature tends to negatively affect the hinge opening while an increase in temperature results in a slight improvement. Next, a parametric study is conducted to examine the effectiveness of shape memory alloy retrofit devices in limiting hinge openings in bridges with various properties. In addition, a comparison is made with other devices such as conventional steel restrainers, metallic dampers, and viscoelastic solid dampers. The results illustrate that superelastic shape memory alloys are superior in their effectiveness compared to other devices in the case of bridges with moderate period ratios and high level of ductility, especially when subjected to strong earthquakes.
