Analysis Of Reinforced Concrete Beams Subjected To Fire
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Analysis Of Reinforced Concrete Beams Subjected To Fire
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Author : Bruce R. Ellingwood
language : en
Publisher:
Release Date : 1976
Analysis Of Reinforced Concrete Beams Subjected To Fire written by Bruce R. Ellingwood and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Building categories.
Methods for analytically predicting the behavior of simply supported reinforced concrete beams subjected to fire are presented. This is generally a two-step process involving a thermal analysis followed by a stress analysis. This study emphasizes the latter, wherein the determination of moment-curvature-time relationships for the beam cross section incorporates the temperature-dependent strength degradation in the steel and concrete as well as thermal and creep strains. The sensitivity of the predictions to various phases of analytical modeling is investigated to establish the parameters most important for the prediction of beam behavior and to indicate where additional data should be gathered. A comparison of predicted behavior with that observed in fire tests shows excellent agreement when realistic reinforcement temperature histories are used.
Analysis Of Reinforced Concrete Beams Subjected To Fire
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Author : Bruce Ellingwood
language : en
Publisher:
Release Date : 1976
Analysis Of Reinforced Concrete Beams Subjected To Fire written by Bruce Ellingwood and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Concrete beams categories.
Analysis Of Reinforced Concrete Beams
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Author : Estados Unidos. Department of Commerce
language : es
Publisher:
Release Date : 1976
Analysis Of Reinforced Concrete Beams written by Estados Unidos. Department of Commerce and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
Finite Element Analysis On The Effect Of Fire For Specified Duration On A Reinforced Concrete Beam With Varied Boundary Conditions
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Author : Meghana Chythanya
language : en
Publisher:
Release Date : 2009
Finite Element Analysis On The Effect Of Fire For Specified Duration On A Reinforced Concrete Beam With Varied Boundary Conditions written by Meghana Chythanya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
ABSTRACT: Concrete is a poor conductor of heat due to its incombustible nature and low thermal diffusivity, which guarantee a slow propagation of thermal transients within the structural members. Despite exhibiting a good behavior at high temperatures, it can suffer considerable damage when exposed to fire. The knowledge of high-temperature properties of concrete is critical for fire resistance assessment because the fire performance of structural members like beams depends on the properties of the constituent materials. To predict the conditions within the RC beams subjected to fire, knowledge is required of the behavior of concrete subjected to high temperatures. To ensure the safety of RC structural systems in the event of fire, concrete members should be designed against fire. The temperature dependent properties that are important for establishing an understanding of the fire-response of RC structures include thermal and material properties at elevated temperatures.
Analysis Of Reinforced Concrete Beams Subjected To Fire
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Author : Bruce R. Ellingwood
language : en
Publisher:
Release Date : 1976
Analysis Of Reinforced Concrete Beams Subjected To Fire written by Bruce R. Ellingwood and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Building categories.
Methods for analytically predicting the behavior of simply supported reinforced concrete beams subjected to fire are presented. This is generally a two-step process involving a thermal analysis followed by a stress analysis. This study emphasizes the latter, wherein the determination of moment-curvature-time relationships for the beam cross section incorporates the temperature-dependent strength degradation in the steel and concrete as well as thermal and creep strains. The sensitivity of the predictions to various phases of analytical modeling is investigated to establish the parameters most important for the prediction of beam behavior and to indicate where additional data should be gathered. A comparison of predicted behavior with that observed in fire tests shows excellent agreement when realistic reinforcement temperature histories are used.
Flexural Response Of Reinforced Concrete Beams Exposed To Fire
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Author : Monther B. M. Dwaikat
language : en
Publisher:
Release Date : 2009
Flexural Response Of Reinforced Concrete Beams Exposed To Fire written by Monther B. M. Dwaikat and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Concrete beams categories.
Developing Strength Reduction Factor For Flexural Design Of Reinforced Concrete Beams Exposed To Fire
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Author : Sahar Aradmehr
language : en
Publisher:
Release Date : 2021
Developing Strength Reduction Factor For Flexural Design Of Reinforced Concrete Beams Exposed To Fire written by Sahar Aradmehr and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Fire is a common hazard that may happen during the lifetime of concrete structures. Thus, it is one of the loads considered in building and tunnel design standards and codes. Dependency of the safety and structural integrity of a building to load-bearing elements such as beams requires the safe design of these elements. Flexural design of reinforced concrete (RC) beams under fire is critical. Typical load and resistance factor design (LRFD) of flexural member at ambient temperature deals with comparing the factored applied load with its capacity. Strength reduction factors are applied to the calculated nominal moment capacity to take into account several factors such as variations in material strength, poor workmanship, and uncertainty in determining the behavior of a member. However, the literature review conducted to-date revealed that no strength reduction factor has been developed for flexural design of RC beams subjected to fire. Current codes are confined to the calculation of the adequacy of the clear cover protection in concrete flexural members based on the ASTM E119 (2019) fire exposure (ACI 216, 2014). The proposed study aims to bridge this knowledge gap and develop a strength reduction factor for flexural design of RC beams at elevated temperature. Previous methods of design of RC beams show an absence of a factor that can assure safety in fire circumstances. Inadequate anticipated capacity can lead to the failure of RC members due to the loss of integrity and strength as a result of exposure to fire.The proposed research envisions to develop a strength reduction factor for flexural design RC beams subjected to fire/elevated temperature.In order to drive this reduction factor, Parametric studies, in this case, reliability analysis utilized to develop an expression to evaluate the reduction factor for flexure design of the beam exposed to fire.
Analysis Of Reinforces Concrete Beams Subjected To Fire
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Author : Bruce Ellingwood
language : en
Publisher:
Release Date : 1976
Analysis Of Reinforces Concrete Beams Subjected To Fire written by Bruce Ellingwood and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
Residual Response Of Reinforced Concrete Beams Following Fire Exposure
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Author : Ankit Agrawal
language : en
Publisher:
Release Date : 2020
Residual Response Of Reinforced Concrete Beams Following Fire Exposure written by Ankit Agrawal and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Electronic dissertations categories.
Reinforced concrete (RC) structures possess inherent fire resistance due to relatively low thermal conductivity, high thermal capacity, and slower strength degradation of concrete with temperature. Nonetheless, fire exposure results in varying reduction in strength and stiffness RC members because of irreversible temperature induced degradation in mechanical properties concrete and rebar. Thus, uncertainty regarding extent of reduction in load bearing capacity RC structures (members) necessitates post-fire assessment of residual capacity to facilitate repair and (or) return to service conditions. Specifically, RC beams or slabs are particularly susceptible to fire damage arising from convective effects (hot gases) and impingement by flames near the ceiling, which do not affect vertical members as significantly. This PhD dissertation develops a comprehensive understanding on the residual response of fire damaged RC beams after exposure to combined effects of fire and structural loading through detailed experimental and numerical studies. A novel three stage approach to evaluate residual response of RC beams following fire exposure is conceptualized to overcome deficiencies in current assessment approaches. The three stages comprise of; Stage 1: evaluating the member response at room temperature during service (load) conditions as present prior to fire exposure; Stage 2: evaluating member response during heating and cooling phases as present in a fire incident, and during extended cool down phase of the member to simulate conditions as occurring after fire is extinguished or burnout conditions are attained; and Stage 3: evaluating residual response of the fire damaged member following complete cool down to room temperature. The proposed approach can account for the influence of critical factors such as, distinct temperature dependent material properties of concrete and rebar during heating, cooling, and residual phases, fire induced residual deformations, load level, and restraint conditions present during fire exposure in evaluating residual response of RC beams.Experimental and numerical studies were conducted to develop needed data for establishing applicability and validity of the proposed approach for tracing residual response. Material level tests were undertaken to establish temperature dependent bond strength relations for interfacial bond between rebar and concrete. Full scale fire resistance tests followed by residual capacity evaluation tests were conducted on six RC beams having different configurations. As part of numerical studies, a three-dimensional finite element based numerical model was developed to implement the proposed three-stage approach for evaluating residual response of fire exposed concrete beams, using general purpose software ABAQUS. The novelty of the developed model lies in explicit consideration of distinct thermomechanical properties of concrete and rebar during heating and cooling phase of fire exposure and residual (after cool down) phase, as well as in incorporation of plastic deflections occurring during fire exposure into post-fire residual response analysis of RC beams. Predictions from the developed model were validated against response parameters measured during tests published in literature and conducted as part of this study. The validated model was applied to conduct parametric studies to quantify the effect of critical parameters, namely, fire severity, load level, axial restraint, cross-sectional dimensions, and cover to reinforcement, on residual response of RC beams following fire exposure. Finally, findings from experimental and numerical studies, together with that reported in literature, were utilized to develop a five-step rational approach combining physical testing with simplified and advanced calculation methods, for practical post-fire assessment of residual capacity in concrete structures.
Inelastic Analysis Of Reinforced Concrete Beams Subjected To Combined Axial And Transverse Loads
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Author : Raza Shahid
language : en
Publisher:
Release Date : 1998
Inelastic Analysis Of Reinforced Concrete Beams Subjected To Combined Axial And Transverse Loads written by Raza Shahid and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.