Behavior Of Fiber Reinforced Concrete Encased Open Web Steel Joist Composite Members Under Monotonic And Reversed Cyclic Loading

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Behavior Of Fiber Reinforced Concrete Encased Open Web Steel Joist Composite Members Under Monotonic And Reversed Cyclic Loading

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Author : Madhusudan Khuntia
language : en
Publisher:
Release Date : 1998

Behavior Of Fiber Reinforced Concrete Encased Open Web Steel Joist Composite Members Under Monotonic And Reversed Cyclic Loading written by Madhusudan Khuntia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Composite construction categories.

Hybrid Fiber Reinforced Concrete Encased Steel Truss Beams For Earthquake Resistant Framed Structures

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Author : Prabuddha Das Gupta
language : en
Publisher:
Release Date : 2005

Hybrid Fiber Reinforced Concrete Encased Steel Truss Beams For Earthquake Resistant Framed Structures written by Prabuddha Das Gupta and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

Behaviour Of Self Consolidating Steel Fiber Reinforced Concrete Beams Under Reversed Cyclic Loading

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Author : Nima Aghniaey
language : en
Publisher:
Release Date : 2013

Behaviour Of Self Consolidating Steel Fiber Reinforced Concrete Beams Under Reversed Cyclic Loading written by Nima Aghniaey and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.

Dissertation Abstracts International

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Author :
language : en
Publisher:
Release Date : 1998

Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Dissertations, Academic categories.

Earthquake Spectra

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Author :
language : en
Publisher:
Release Date : 1999

Earthquake Spectra written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Buildings categories.

Peer Center News

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Author :
language : en
Publisher:
Release Date : 1998

Peer Center News written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Earthquake engineering categories.

Experimental Study Of Flexural Behavior Of Preflex Sfrc Encased Steel Joist Composite Beams

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Author : Niraj Narendra Bora
language : en
Publisher:
Release Date : 2020

Experimental Study Of Flexural Behavior Of Preflex Sfrc Encased Steel Joist Composite Beams written by Niraj Narendra Bora and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.

This study investigates the behavior of encased steel composite beams in straight and preflex beams, constructed and tested at Civil Engineering Laboratory Building (CELB). Upwards camber is provided in the steel sections in steel angles and HSS tube in the composite beam encased in Steel fibers reinforced concrete (SFRC). Experimental procedure has been performed to study the flexural behavior of composite steel joists encased in SFRC. Compressive strength, tensile strength and modulus of rupture are computed. The physical properties of steel fiber reinforced concrete are calculated through testing at the UTA Civil Engineering Laboratory Building. Eighteen cylindrical (4"x8") specimens, eighteen beams encased with Double angle (6"x6"x20"), eighteen beams encased with HSS steel beams (6"x6"x20") were prepared and tested after 28 days of curing. The specimens were tested for their compressive strength, tensile strength, and modulus of rupture. The results showed that compressive strength increased by 45% with adding steel fibers of 1% by volume in concrete. Also, addition of 1% steel fibers by volume increases the tensile strength by 33% as compared to 0% steel fibers by volume. The experimental results showed that, cambering of double angles in concrete beam increases the ultimate load capacity by 10% while midspan deflection reduces by 25% relative to straight section in concrete beam. The study investigates flexural behavior HSS and double angle encased concrete beams, while results shows approximately similar performance for both type of beams. Use of steel fibers reinforced concrete is also an advantage to increase the flexural capacity of beam and to reduction in midspan. Adding 1% volume fraction of steel fibers to increases the ultimate load capacity by 30% and reduces the midspan deflection by 41% comparative to concrete without steel fibers. This study shows that, there is significant improvement in the flexural capacity of beam with the provision of cambering and addition of steel fibers. Preflex Encased steel Joist Composite Beams are innovative structural members that provides more strength to structures with long spans like long span bridges, because it requires girders of large flexural capacity.

Composite And Hybrid Structures

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Author : Yan Xiao
language : en
Publisher:
Release Date : 2000

Composite And Hybrid Structures written by Yan Xiao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Building, Iron and steel categories.

Multi Scale Pull Out Behaviors Of Fiber And Steel Reinforcing Bar In Hybrid Fiber Reinforced Concrete

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Author : Alexander Lin
language : en
Publisher:
Release Date : 2017

Multi Scale Pull Out Behaviors Of Fiber And Steel Reinforcing Bar In Hybrid Fiber Reinforced Concrete written by Alexander Lin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.

For a reinforced concrete structural member, sufficient bond between steel reinforcing bar and concrete guarantees a steel/concrete composite behavior, which is essential for a good overall member performance. Under severe loading, high slippage between rebar and concrete leads to matrix cracking and crushing in the bond region followed by degradation of the rebar/matrix bond. Fiber reinforcement provides a fiber bridging mechanism to resist such cracking behavior by modifying the tensile properties of the matrix. This thesis investigated a deflection hardening hybrid fiber reinforced concrete (HyFRC) with micro/macro fiber hybridization and recommends it as a matrix to enhance the rebar/matrix bond by utilizing its superior crack resisting ability. In the experimental phase, the rebar bond behaviors in ordinary concrete (OC), HyFRC without/with high volume fly ash and Engineered Cementitious Composites (ECC), another type of fiber reinforced cement-based composite (FRCC) with hardening behavior, were studied. The experimental program consists of monotonic and cyclic rebar pull-out test series and was supported by digital image correlation (DIC) and vibration test techniques. Different specimens were made by varying some conditions such as rebar size (no. 4 and no. 8) and absence/presence of transverse reinforcement (spiral) so the effect of such conditions in regards to bond between rebar and different matrices can also be studied. In addition to experiments, Finite element models were developed to further investigate the mechanical behavior of the HyFRC matrix during rebar pull-out and to examine how a transverse steel reinforcement affects such behavior. The experimental results showed that HyFRC can improve the rebar pull-out behavior by changing the failure mode from brittle splitting failure to a more ductile frictional pull-out failure compared to the OC material. The HyFRC material without fly ash provided better rebar bond performance compared to OC with spiral reinforcement and other type of FRCC under investigation. Compared to the monotonic rebar pull-out behavior, only minimal amount of additional damage was induced in such HyFRC material by repeated loading and unloading process from cyclic loading protocol. DIC measurement indicated that the width of the splitting cracks that form in HyFRC matrices due to rebar pull-out could be further reduced when such specimens were confined by spirals. The finer the splitting cracks, the higher the rebar gripping stress and hence the higher the rebar pull-out resistance. The DIC measurement was consistent with the results from finite element analysis because both of them showed that confining the HyFRC matrix with transverse steel reinforcement led to a more uniform distribution of the splitting crack width during rebar pull-out. The vibration test showed that rebar pull-out induced similar degree of damage in the bond regions of HyFRC with and without transverse reinforcement. If severe macrofiber pull-out occurs within the cracks induced by rebar pull-out, the macrofibers become less effective in resisting such cracks. Therefore, good macrofiber pull-out resistance in HyFRC is essential for an improved rebar pull-out performance. To investigate the macrofiber pull-out behavior and how it is affected by the presence of PVA microfibers in HyFRC, single fiber pull-out tests were conducted for various mortar mixtures. In some of these mortars, the cement was replaced by industrial by-products, such as fly ash and slag. In addition, macrofiber pull-out behavior in an ultra-high strength concrete with and without steel microfiber reinforcement was also studied. The results of the single fiber pull-out tests revealed that the presence of PVA microfibers in a mortar mixture designed based on the HyFRC mixture enhances the steel macrofiber pull-out resistance. This synergy between micro and macrofibers provided a more effective control of the splitting cracks and was responsible for the superior rebar bond performance. Hence, the research revealed a multi-scale bond enhancement in a HyFRC member reinforced by steel rebar. The macrofiber pull-out behaviors from mortars in which 45% and 15% of cement were replaced by slag and fly ash, respectively, showed that slag densified the steel macrofiber/matrix interface and hence, improved the pull-out resistance for the macrofiber. On the other hand, test results of fiber pull-out specimens in which 55% of cement was replaced by fly ash showed that increasing curing age made the PVA microfiber reinforcement less effective in resisting steel macrofiber pull-out. Such characteristic showed how high-volume fly ash weakened the PVA fiber/matrix bond. This mechanism induced by fly ash made PVA fibers in HyFRC less effective in improving steel macrofiber pull-out resistance and hence, reduced the micro/macro fiber synergy, which is beneficial for the rebar bond behavior. Therefore, using high volume fly ash decreased the rebar pull-out resistance in HyFRC. When steel macrofibers were pulled out from extremely strong matrices, almost no microcracks formed around macrofibers and the steel microfiber reinforcement didn’t affect the macrofiber pull-out behavior because such microfibers function by bridging the microcracks.

Flexural Behavior Of Preflex Sfrc Encased Steel Joist Composite Beams

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Author : Nancy Thazhampallatu Varughese
language : en
Publisher:
Release Date : 2019

Flexural Behavior Of Preflex Sfrc Encased Steel Joist Composite Beams written by Nancy Thazhampallatu Varughese and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.

This research investigates the behavior of encased steel composite beams within steel fiber reinforced concrete (SFRC) in straight and preflex beams, using nonlinear analysis. ABAQUS FEA software has been adopted. Composite steel beams encased in fiber reinforced concrete are analyzed and a comparison is made with available experimental results. Good agreement with the experimental results is observed. Upwards camber of the steel section is introduced on the steel joist. It's found that the preflex section can increase the ultimate load capacity by 10% and decrease midspan displacement by 13% of the same beams without the preflex steel section. Steel fiber dosages, compressive strength, modulus of rupture are examined. The effect of cambering and mesh refinement are also investigated. The physical properties of SFRC are calculated through testing at the UTA Civil Engineering Laboratory Building. In total, nine (4" x 8") cylindrical specimens, nine (6" x 8") cylindrical specimens, and nine (6" x 6" x 20") beam specimens were produced and tested for their compressive strength, tensile strength, and modulus of rupture after 28 days of curing. The addition of steel fiber will lead to a significant increase in tensile strength and modulus of rupture of concrete. Adding 1% steel fibers by volume can increase the load capacity by 33% and decrease the midspan displacement by 70% in comparison to the same beam using plain concrete. The increase in steel fibers and cambering show an improvement to the flexural capacity and cracking point of the beam, which can provide more strength to structures such as long span bridges.