Impact of Grade 80 Reinforcing Steel Production Process on the Seismic Behavior of Bridge Columns PDF Download
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Author: Robyn Elise Manhard
Publisher:
ISBN:
Category :
Languages : en
Pages : 169
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Author: Robyn Elise Manhard
Publisher:
ISBN:
Category :
Languages : en
Pages : 169
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Author: Jessica Thangjitham
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Leo Barcley
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 182
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Author: David Trejo
Publisher:
ISBN:
Category :
Languages : en
Pages :
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This project assessed the use of ASTM A706 Grade 80 reinforcing bars in reinforced concrete columns. Grade 80 is not currently allowed in reinforced concrete columns due to lack of information on the material characteristics and column performance. Six half-scale, circular columns were tested: three constructed with Grade 60 reinforcement and three constructed with Grade 80 reinforcement. Designs followed standard design methodologies used by State Highway Agencies (including AASHTO). Results indicate that columns constructed with Grade 80 reinforcement performed similar to columns constructed with conventional ASTM A706 Grade 60 reinforcement. Computational modeling was performed using OpenSees for all six columns. Results indicate that the columns constructed with Grade 80 reinforcement achieved similar resistance and displacement and curvature ductility values when compared with the reference columns constructed with Grade 60 reinforcement. The columns constructed with Grade 60 reinforcement showed larger hysteretic energy dissipation than the columns constructed with Grade 80 reinforcement.
Author: Tim B. Link
Publisher:
ISBN:
Category : Columns, Concrete
Languages : en
Pages : 73
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The research presented in this thesis assessed the use of high strength steel (HSS) reinforcement for use in reinforced concrete (RC) bridge columns. HSS is not currently allowed in reinforced concrete bridge columns due to a lack of information on the material characteristics and performance information when used in RC bridge columns. Potential benefits in construction, performance, and economics justify the need for research. This research investigated the performance of HSS (ASTM A706 Grade 80 reinforcement) embedded in half-scale RC bridge columns. Column design followed standard design methodologies used by federal and state highway agencies. Six columns were subjected to lateral cyclic loadings, three columns were constructed with Grade 60 reinforcement and three columns were constructed with Grade 80 reinforcement. Results indicate that the columns constructed with Grade 80 reinforcement achieved similar resistances and displacement ductility values when compared with the reference columns constructed with Grade 60 reinforcement. The columns constructed with Grade 60 reinforcement showed larger hysteretic energy dissipation and typically exhbitied larger curvature ductility values than the columns constructed with Grade 80 reinforcement. The effects of the longitudinal reinforcement ratio and moment-shear span ratio on column performance were similar between columns constructed with Grade 60 reinforcement and columns constructed with Grade 80 reinforcement. The results from this research present a promising step towards the implementation of Grade 80 reinforcement in the design and construction of RC bridge columns, within the bounds of the variables used in the testing program.
Author: Laura N. Lowes
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 180
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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: Drit Sokoli
Publisher:
ISBN:
Category :
Languages : en
Pages : 308
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Test results are presented from an experimental program carried at the University of Texas at Austin aimed at evaluating the seismic performance of concrete columns reinforced with high-strength steel. Comparisons are made between the performance of columns reinforced with conventional Grade 60 steel, and the higher Grade 80. The high-strength steel used in this study is the result of a recent push in the U.S. to produce higher grade reinforcing bars with relatively high ductility. All steel used satisfied the specifications of ASTM A706. Column specimens were tested under constant axial load and reverse cyclic lateral loading until collapse. Columns performed in a similar manner, indicating that current limits on the yield strength of reinforcing bars in seismic applications could be raised to include Grade 80 A706 bars. Conclusions are drawn with respect to the effects of higher strength reinforcement on, member cracking, drift capacity, plasticity spread, plastic hinge performance, and strain demands on reinforcing bars.
Author: Nadim I. Wehbe
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 432
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Author: Kuanshi Zhong
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ISBN:
Category :
Languages : en
Pages :
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Low-cycle fatigue and fracture of longitudinal reinforcing steel is a critical potential failure mode in concrete structures subjected to earthquake ground motions. Design to resist fracture depends on the reinforcing steel materials, the design details of the reinforced concrete members, and the cyclic deformation and strain demands imposed by the earthquake. Recently, concerns related to reinforcing bar fatigue and fracture have arisen due to two developments. One is the interest by the engineering and construction industry to utilize high-strength reinforcing steel materials in structures designed for regions with high seismic hazard. Since high-strength reinforcing bars tend to be less ductile and more prone to low-cycle fatigue, as compared to conventional Grade 60 bars, their adequacy for use in structures in high seismic regions needs to be confirmed. The second is related to concerns about long duration ground motions, which can increase the cyclic loading demands on steel reinforcement. Since current design methods do not explicitly consider the influences of ground motion duration, questions have been raised as to whether current seismic design requirements are adequate for structure in regions that may be affected by large magnitude earthquakes or geologic basin effects, which can lead to ground motion duration that are longer than considered in conventional designs. In the prevailing structural design and assessment methods, fatigue and fracture are only implicitly considered by checks of peak deformation measures (e.g., peak strain demand) or other proxy measures (e.g., cumulative plastic demand), which are not sufficient to resolve behavioral effects associated with material cyclic toughness and duration effects under random cyclic loading. This study (1) develops a reliable analytical framework and supporting computational tools for simulating fatigue and fracture in steel reinforcement, considering the steel material properties, reinforcing bar details in concrete structures, and random ground motion loading; (2) applies these methods to evaluate seismic design requirements for high-strength reinforcing bars, specifically Grade 80 and Grade 100 bars; (3) develops an analytical framework and algorithms for using nonlinear dynamic analysis results to systematically evaluate earthquake duration and ground motion spectral shape effects on structures; and (4) applies these methods to incorporate earthquake duration effects in the design of reinforced concrete bridge piers.
Author:
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Category :
Languages : en
Pages :
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