Strengthening of Reinforced Masonry Walls Subjected to Out-of-plane Pseudo-static Cyclic Load Using Advanced Composite PDF Download
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Author: Zuhair Al-Jaberi
Publisher:
ISBN:
Category :
Languages : en
Pages : 264
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"A number of researchers have conducted experimental tests on unreinforced masonry walls (URM) strengthened with advanced composite materials. Consequently, the strengthening design guidelines are limited in their scope to URM. This research aimed to investigate the behavior of reinforced masonry walls strengthened with advanced composite and subjected to out-of-plane pseudo-static cyclic load. Experimental and analytical studies were conducted to evaluate the performance of different techniques such as near surface mounted (NSM) and externally bonded (EB) fiber reinforced polymer (FRP) with epoxy resin, in addition to NSM with cementitious adhesive and fiber reinforced cementitious material (FRCM). The experimental part included three phases. In the first phase, a series of 42 reinforced masonry walls were tested to study the effectiveness of advanced composites in enhancing out-of-plane flexural capacity. The effect of long-term environmental exposure on strengthening systems was investigated in the second phase of study by testing 10 reinforced masonry walls. The third phase focused on bond behavior between the advanced composite and the concrete masonry unit at different temperatures; 56 specimens were used for this purpose. The results indicated that the non-arching strengthened reinforced masonry wall's behavior was significantly dependent on the type of fiber and fiber reinforcement ratio. The specimens strengthened with glass under combined environmental cycles exhibited an insignificant change in terms of ultimate strength as compared to laboratory conditioned specimens. The theoretical part included the investigation of bond reduction factors, seismic performance, and the nonlinear analysis of strengthened reinforced masonry wall using moment-curvature analysis. As a result of this study, the proposed model for predicting debonding strain and the moment-curvature relation presented an excellent prediction compared to the experimental results"--Abstract, page iv.
Author: Zuhair Al-Jaberi
Publisher:
ISBN:
Category :
Languages : en
Pages : 264
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Book Description
"A number of researchers have conducted experimental tests on unreinforced masonry walls (URM) strengthened with advanced composite materials. Consequently, the strengthening design guidelines are limited in their scope to URM. This research aimed to investigate the behavior of reinforced masonry walls strengthened with advanced composite and subjected to out-of-plane pseudo-static cyclic load. Experimental and analytical studies were conducted to evaluate the performance of different techniques such as near surface mounted (NSM) and externally bonded (EB) fiber reinforced polymer (FRP) with epoxy resin, in addition to NSM with cementitious adhesive and fiber reinforced cementitious material (FRCM). The experimental part included three phases. In the first phase, a series of 42 reinforced masonry walls were tested to study the effectiveness of advanced composites in enhancing out-of-plane flexural capacity. The effect of long-term environmental exposure on strengthening systems was investigated in the second phase of study by testing 10 reinforced masonry walls. The third phase focused on bond behavior between the advanced composite and the concrete masonry unit at different temperatures; 56 specimens were used for this purpose. The results indicated that the non-arching strengthened reinforced masonry wall's behavior was significantly dependent on the type of fiber and fiber reinforcement ratio. The specimens strengthened with glass under combined environmental cycles exhibited an insignificant change in terms of ultimate strength as compared to laboratory conditioned specimens. The theoretical part included the investigation of bond reduction factors, seismic performance, and the nonlinear analysis of strengthened reinforced masonry wall using moment-curvature analysis. As a result of this study, the proposed model for predicting debonding strain and the moment-curvature relation presented an excellent prediction compared to the experimental results"--Abstract, page iv.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Jeremy Keith Wallace
Publisher:
ISBN:
Category :
Languages : en
Pages : 314
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During recent years, near surface mounted (NSM) fiber reinforced polymer (FRP) bars have displayed exceptional results when used to retrofit un-reinforced masonry walls for flexural out-of-plane strengthening. This process involves cutting a shallow groove into the masonry wall, which is less than the thickness of the face shell. FRP bars are then placed into the groove and embedded in an epoxy paste, which transfers stresses from the masonry wall to the reinforcing bar. Although this retrofitting technique is advantageous for most structural applications, the nature of the bar location introduces an inherent restriction. By locating the bar at a depth no greater than the thickness of the face shell, the flexural strength is only increased in one direction. This limitation introduced an opportunity to develop a novel approach to flexural out-of-plane strengthening of masonry walls for cyclic loading, which was the overall objective of this research project. The retrofitting technique is similar to that of NSM rods; but the FRP bars are placed at the centerline of the wall analogous to traditional steel rebars for two directional reinforcing. Test results confirmed that FRP bars can be used to drastically increase flexural capacity of masonry walls subjected to cyclic loading, while remaining practical and beneficial in terms of field construction. Standard working stress equations were also used to conservatively predict the structural responses of the masonry walls within 9 to 15.8 percent.
Author: Saman Babaeidarabad
Publisher:
ISBN:
Category :
Languages : en
Pages :
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A natural evolution of ferrocement has been the replacement of the reinforcing steel with new composite materials. Not only has this addressed the issue of possible durability problems associated with steel corrosion, but has opened the possibility of using thin-section cementitious products as repair materials. Fabric-reinforced cementitious matrix (FRCM) is a class of composite systems that has recently emerged as an alternative to traditional retrofitting methods like fiber-reinforced polymers (FRP), steel plate bonding, section enlargement, and external post-tensioning for repairing and strengthening reinforced concrete (RC) and masonry structures. FRCM consists of a reinforcing phase (fabrics) embedded into a matrix (cementitious mortar) adhered to concrete or masonry structural members and acts as supplemental, externally-bonded reinforcement. The goal of this dissertation is to experimentally and analytically investigate the effectiveness of FRCM to retrofit existing masonry structures; to evaluate the flexural and shear capacity of FRCM walls; to develop structural design procedures; and, to compare FRCM and FRP externally strengthened masonry walls. The dissertation is articulated in three studies. The first study (Study 1) investigates masonry walls externally strengthened with FRCM subjected to diagonal compression; the second (Study 2) focuses on FRCM strengthened walls subjected to out-of-plane loading; and the third (Study 3) presents a comparison between experimental results in this research program and other research programs using FRP systems when the normalized shear or flexural capacity is related to a calibrated reinforcement ratio.
Author: Hyunchul Jung
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Unreinforced masonry (URM) walls are commonly found in existing and heritage buildings in Canada, either as infill or load-bearing walls. Such walls are vulnerable to sudden and brittle failure under blast loads due to their insufficient out-of-plane strength. The failure of such walls under blast pressures can also result in fragmentation and wall debris which can injure building occupants. Over the years, researchers have conducted experimental tests to evaluate the structural behaviour of unreinforced masonry walls under out-of-plane loading. Various strengthening methods have been proposed, including the use of concrete overlays, polyurea coatings and advanced fiber-reinforced polymer (FRP) composites. Fabric-reinforced cementitious matrix (FRCM) is an emerging material which can also be used to strengthen and remove the deficiencies in unreinforced masonry walls. This composite material consists of a sequence of one or multiple layers of cement-based mortar reinforced with an open mesh of dry fibers (fabric). This thesis presents an experimental and analytical study which investigates the effectiveness of using FRCM composites to improve the out-of-plane resistance of URM walls when subjected to blast loading. As part of the experimental program, two large-scale URM masonry walls were constructed and strengthened with the 3-plies of unidirectional carbon FRCM retrofit. The specimens included one infill concrete masonry (CMU) wall, and one load-bearing stone wall. The University of Ottawa Shock Tube was used to test the walls under gradually increasing blast pressures until failure, and the results were compared to those of control (un-retrofitted) walls tested in previous research. Overall, the FRCM strengthening method was found to be a promising retrofit technique to increase the blast resistance of unreinforced masonry walls. In particular, the retrofit was effective in increasing the out-of-plane strength, stiffness and ultimate blast capacity of the walls, while delaying brittle failure and reducing fragmentation. As part of the analytical research, Single Degree of Freedom (SDOF) analysis was performed to predict the blast behaviour of the stone load-bearing retrofit wall. This was done by computing wall flexural strength using Plane Section Analysis, and developing an idealized resistance curve for use in the SDOF analysis. Overall, the dynamic analysis results were found to be in reasonable agreement with the experimental maximum displacements.
Author: Miha Tomaževič
Publisher:
ISBN:
Category : Earthquake resistant design
Languages : en
Pages :
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Author: Miha Tomaževič
Publisher:
ISBN:
Category : Reinforced masonry
Languages : en
Pages :
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Author: Mohamed Hassan Ali
Publisher:
ISBN:
Category : Concrete walls
Languages : en
Pages : 148
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Evaluates the contribution of externally bonded fiber composite reinforcements to the out of plane shear strength of concrete masonry wall systems by testing 18 compact concrete masonry wall panels for out-of-plane static loads. Concludes that the distance between the end of fiber and the support had no major influence on the shear strength of the system; and, that dowel action increased slightly with a higher reinforcement ratio.
Author: Man Xu
Publisher: Elsevier
ISBN: 0443217238
Category : Technology & Engineering
Languages : en
Pages : 345
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Book Description
Since the notorious terrorist attack of the World Trade Center in 2001, researchers and engineers have been forced to review the existing research works and standards in resisting the progressive collapse of structures. From then on, the design of structure against progressive collapse has tended toward quantitative design, rather than qualitative design. The collapse of the COVID-19 epidemic isolation hotel in Quanzhou, China, in 2020 and the vertical collapse of a 12-story apartment in Florida, United States, in 2021 have aroused an upsurge of the research on progressive collapse. More experimental and theoretical works have been focused on this area. This book addresses this issue and provides a valuable reference for the progressive collapse analysis and design of building structures. Reviews latest references systematically in terms of experiments, simulation, and theory Introduces different test equipment used in the tests of progressive collapse and also modeling techniques used in the numerical studies of progressive collapse Includes performance prediction theories used in the analysis of progressive collapse Comprises considerable information on the tests and simulation and theoretical studies collected from the authors’ research in the last 10 years
Author: Miha Tomaževič
Publisher:
ISBN:
Category : Concrete blocks
Languages : en
Pages :
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