Influence of Reinforcing Steel Fracture on Seismic Performance of Concrete Structures PDF Download
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Author: Kuanshi Zhong
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
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: Kuanshi Zhong
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
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: Christian Meyer
Publisher: Springer
ISBN: 3709125243
Category : Technology & Engineering
Languages : en
Pages : 257
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Book Description
A comprehensive review of the material behavior of concrete under dynamic loads, especially impact and impuls, opens the volume. It is followed by a summary of the various analytical tools available to engineers interested in analyzing the nonlinear behavior of reinforced concrete members for dynamic load. These range from relatively simple and practice-oriented push-over analysis to sophisticated layered finite element models. Important design-related topics are discussed, with special emphasis on performance of concrete frames subjected to seismic loads. The significance of modern software systems is recognized by including extensive examples. For readers not current in dynamic analysis methods, an appendix contains a review of the mathematical methods most commonly used for such analysis.
Author: Dejian Shen
Publisher: Springer Nature
ISBN: 9819979846
Category :
Languages : en
Pages : 394
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Book Description
Author: Drit Sokoli
Publisher:
ISBN:
Category :
Languages : en
Pages : 598
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Book Description
Fracture of longitudinal bars due to high-strain low-cycle fatigue is a critical failure mode in seismically detailed reinforced concrete frame members because it can lead to rapid strength loss and structural instability. The issue has recently attracted attention due to a national effort aimed at introducing high-strength reinforcing bars (HSRB) with yield strengths of 80 and 100 ksi in concrete construction. The HSRB being produced in the United States possess varying post-yield mechanical properties, such as the tensile-to-yield strength ratio, uniform or fracture elongations, as well as low-cycle fatigue life. The behavior of Special Moment Frame (SMF) members with different types of HSRB subjected to large inelastic demands up to bar fracture is investigated through laboratory testing and analytical examination. Laboratory tests were performed to identify any major issues in the performance of HSRB in concrete members. More specifically, the work aimed to assess the influence of the tensile-to-yield strength (T/Y) ratio, fracture elongation, and shape of stress strain curve of HSRB on the behavior of seismically detailed concrete columns. Four specimens were tested under constant axial load and reverse cyclic lateral loading of increasing amplitudes until fracture of longitudinal bars. Three columns were reinforced with grade 100 bars sourced from different manufacturers and therefore having different post-yield mechanical properties. The fourth column was reinforced with conventional grade 60 ASTM A706 (2016) bars. Concrete columns reinforced with HSRB reached similar lateral drift levels as the specimen reinforced with grade 60 bars before significant loss in lateral strength. A computational framework based on fiber-section elements and mechanics-based behavioral models is proposed to accurately estimate both member-level deformations and strain demands in longitudinal bars and the concrete surrounding them within the plastic hinge regions of frame members. Particularly, the effects of the mechanical properties and steel grade of reinforcing bars on their strain demands are quantified experimentally and estimated by the proposed framework. The strain demands derived through the proposed analytical framework were used to track the damage progress in longitudinal bars that lead to buckling and fracture. A buckling initiation model is proposed that accounts for the mechanical properties of the reinforcing bars, as well as the loading history the bars and the surrounding concrete experience prior to buckling. Material specific bar fatigue relations calibrated through material test results are used to predict the number of half-cycle to bar fracture based on accumulation of strain demands prior and after buckling if it occurs.
Author: Insert Name Here
Publisher: kassel university press GmbH
ISBN: 3862192644
Category : Concrete
Languages : en
Pages : 1059
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Book Description
Author: Manish Shrikhande
Publisher: Springer Nature
ISBN: 9819916046
Category : Science
Languages : en
Pages : 823
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Book Description
This book presents select proceedings of the 17th Symposium on Earthquake Engineering organized by the Department of Earthquake Engineering, Indian Institute of Technology Roorkee. The topics covered in the proceedings include engineering seismology and seismotectonics, earthquake hazard assessment, seismic microzonation and urban planning, dynamic properties of soils and ground response, ground improvement techniques for seismic hazards, computational soil dynamics, dynamic soil–structure interaction, codal provisions on earthquake-resistant design, seismic evaluation and retrofitting of structures, earthquake disaster mitigation and management, and many more. This book also discusses relevant issues related to earthquakes, such as human response and socioeconomic matters, post-earthquake rehabilitation, earthquake engineering education, public awareness, participation and enforcement of building safety laws, and earthquake prediction and early warning system. This book is a valuable reference for researchers and professionals working in the area of earthquake engineering.
Author:
Publisher:
ISBN:
Category : Earthquake engineering
Languages : en
Pages : 108
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Book Description
These papers will provide engineers and contractors with up-to-date information on new technologies that are available now to improve the performance of reinforced concrete structures, especially in zones of high seismicity and to make design and construction more cost effective.
Author: Xin Hu
Publisher:
ISBN:
Category : Concrete construction
Languages : en
Pages : 18
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Book Description
To predict the crack propagation and failure response of reinforced concrete structure, the effect of defects on reinforced concrete fracture characteristics was investigated.ased on the improved wedge splitting test device (an authorized patent No. ZL201410085111.7, China), specimens with various defects were tested. The formulas for the reinforced concrete double-K fracture parameters were derived, and a matrix describing the influence of defects was given. By this matrix, the defects were quantitatively transformed into the sectional loss and the double-K fracture parameters of these specimens were determined. The initial cracking load, unstable load, critical effective crack length, and unstable toughness were found to be improved significantly by the steel bars, but the initial toughness reduced slightly. In addition, with the increasing of sectional loss caused by defects, the initial cracking load, unstable load, and unstable toughness decreased in different proportions. Nevertheless, the defects were irrelevant to the critical effective crack length and the initial toughness. Besides, the critical interval of sectional loss ranged from 14.78 % to 15.48 % in the tests. Once the sectional loss was beyond this range, the steel bar enhancement on unstable toughness could no longer completely offset its attenuation caused by defects.
Author: Alberto Carpinteri
Publisher: CRC Press
ISBN: 1482296624
Category : Architecture
Languages : en
Pages : 631
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Book Description
Emphazises the most recent advances in fracture mechanics as specifically applied to steel bar reinforced concrete. Extensive expert opinions in four selected areas: size effects; anchorage and bond; minimum reinforcement for elements in flexure; and shear resistance. Logically addresses themes and demonstrate the unique ability of fracture mechanics to capture all the experimentally observed characteristics.
Author: S.P. Shah
Publisher: Springer Science & Business Media
ISBN: 9400951213
Category : Science
Languages : en
Pages : 701
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Book Description
Portland cement concrete is a relatively brittle material. As a result, mechanical behavior of concrete, conventionally reinforced concrete, prestressed concrete, and fiber reinforced concrete is critically influenced by crack propagation. It is, thus, not surprising that attempts are being made to apply the concepts of fracture mechanics to quantify the resistance to cracking in cementious composites. The field of fracture mechanics originated in the 1920's with A. A. Griffith's work on fracture of brittle materials such as glass. Its most significant applications, however, have been for controlling brittle fracture and fatigue failure of metallic structures such as pressure vessels, airplanes, ships and pipe lines. Considerable development has occurred in the last twenty years in modifying Griffith's ideas or in proposing new concepts to account for the ductility typical of metals. As a result of these efforts, standard testing techniques have been available to obtain fracture parameters for metals, and design based on these parameters are included in relevant specifications. Many attempts have been made, in the last two decades or so, to apply the fracture mechanics concepts to cement, mortar, con crete and reinforced concrete. So far, these attempts have not led to a unique set of material parameters which can quantify the resistance of these cementitious composites to fracture. No standard testing methods and a generally accepted theoretical analysis are established for concrete as they are for metals.
