A Study of Ductility of Reinforced Concrete Beam Column Joints PDF Download

Author: A.P. Goyal
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Dai Ruitong
Publisher:
ISBN:
Category : Building laws
Languages : en
Pages : 65

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Author: Norman W. Hanson
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 48

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Author: Robert Park
Publisher: John Wiley & Sons
ISBN: 9780471659174
Category : Technology & Engineering
Languages : en
Pages : 794

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Sets out basic theory for the behavior of reinforced concrete structural elements and structures in considerable depth. Emphasizes behavior at the ultimate load, and, in particular, aspects of the seismic design of reinforced concrete structures. Based on American practice, but also examines European practice.

Author: Paul Robert Gefken
Publisher:
ISBN:
Category :
Languages : en
Pages : 350

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Author: Firat Alemdar
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 310

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Abstract: Beam-column joints are one of the most critical elements of reinforced concrete moment resisting frames subjected to lateral seismic loading. The older reinforced concrete buildings designed before the introduction of modern seismic codes in the early 1970's, in general, do not meet the current design code requirements. In particular, the beam-column joints in such existing buildings do not have appropriate detailing which leads to insufficient lateral strength or ductility to withstand the effects of a severe earthquake loading. Therefore, evaluation of the lateral load carrying capacity of existing buildings for subsequent retrofit is very important for the safety of the buildings. The economical aspect should also be considered during the design of a structure which is only possible if the behavior of the structure during an earthquake can be predicted. The focus of this research is to evaluate the shear behavior of reinforced concrete beam-column joints and to develop a suitable model that would predict the lateral load carrying capacity. Previous experimental studies and results have shown that the shear strength of beam-column joints depends on several variables including concrete strength, axial load ratio, joint geometry joint transverse reinforcement ratio, and displacement ductility. However, the current codes include the effects of all of these parameters in beam-column joint design. Therefore, previous analytical research is examined and this information is used to develop a shear strength model. The proposed model is mainly based on the shear strength model for columns developed by Sezen and Moehle (2004). The proposed shear strength model is verified with experimental test results. Overall, the model did a reasonable job of predicting the shear strength of reinforced concrete beam-column joints. The proposed model provides a simply tool for the analysis of existing reinforced concrete buildings subjected to lateral loading and to determine the amount of remediation necessary for satisfactory seismic performance.

Author: Shuk-Lei Lau
Publisher:
ISBN: 9781361234235
Category :
Languages : en
Pages :

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This dissertation, "Rehabilitation of Reinforced Concrete Beam-column Joints Using Glass Fibre Reinforced Polymer Sheets" by Shuk-lei, Lau, 劉淑妮, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled REHABILITATION OF REINFORCED CONCRETE BEAM-COLUMN JOINTS USING GLASS FIBRE REINFORCED POLYMER SHEETS Submitted by LAU Shuk Lei For the degree of Master of Philosophy At The University of Hong Kong in August 2005 Shear failure of beam-column joints is one of the main causes of collapse of many moment-resisting reinforced concrete (RC) frame buildings in recent earthquakes. Evidence from recent earthquakes indicates that deficient beam-column joints can jeopardize the integrity of the entire structure. The brittle joint shear failure also significantly reduces the overall ductility of structures, resulting in dangerous failure mechanisms. A variety of techniques have been developed to strengthen beam-column joints. These techniques include the use of steel and concrete jacketing. More than a decade ago, a new technique for strengthening structural elements emerged. This involves the use of fibre-reinforced polymer (FRP) as externally bonded reinforcement in critical regions of RC elements. FRP materials have a number of advantages over steel and concrete that make them an ideal material in strengthening deficient beam-column joints. Most of the FRP-strengthening schemes developed for beam-column joints so far have a limited range of applicability and limitations. The aim of this study is to develop a practical rehabilitation system for strengthening and repairing deficient RC beam-column joints. Two rehabilitation schemes aiming at improving the shear strength of beam-column joints were proposed. Glass fibre-reinforced polymer (GFRP) was adopted in the study because it has a higher fracture strain than carbon fibre. A total of seven half-scale RC beam-column joint specimens were investigated, all without transverse reinforcement in the joint region. Five of them were fabricated and tested in this study, while the other two specimens, which served as reference specimens, were fabricated and tested earlier in a separate study. The five specimens produced in this study were rehabilitated with GFRP composite sheets to evaluate the effectiveness of the rehabilitation schemes. Three of the specimens were tested under reversed cyclic quasi-static loading to simulate the seismic effects on structures, and the other two specimens were tested under monotonic loading. Experimental results illustrated that the GFRP-rehabilitated joints exhibited an improved displacement ductility, a lower rate of strength degradation and a higher cumulative energy dissipation than the reference specimens. The strain reduction in steel reinforcement for the rehabilitated specimens exceeded 45%, demonstrating the efficiency of the external GFRP reinforcement. The importance of reliable anchorage methods in preventing premature delamination of FRP was also addressed. DOI: 10.5353/th_b3200163 Subjects: Concrete construction - Joints Reinforced concrete construction - Repairing Fibrous composites Fiber-reinforced concrete

Author:
Publisher:
ISBN:
Category : Carbon fiber-reinforced plastics
Languages : en
Pages : 189

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Use of fiber reinforced polymer (FRP) material has been a good solution for many problems in many fields. FRP is available in different types (carbon and glass) and shapes (sheets, rods, and laminates). Civil engineers have used this material to overcome the weakness of concrete members that may have been caused by substandard design or due to changes in the load distribution or to correct the weakness of concrete structures over time specially those subjected to hostile weather conditions. The attachment of FRP material to concrete surfaces to promote the function of the concrete members within the frame system is called Externally Bonded Fiber Reinforced Polymer Systems. Another common way to use the FRP is called Near Surface Mounted (NSM) whereby the material is inserted into the concrete members through grooves within the concrete cover. Concrete beam-column joints designed and constructed before 1970s were characterized by weak column-strong beam. Lack of transverse reinforcement within the joint reign, hence lack of ductility in the joints, and weak concrete could be one of the main reasons that many concrete buildings failed during earthquakes around the world. A technique was used in the present work to compensate for the lack of transverse reinforcement in the beam-column joint by using the carbon fiber reinforced polymer (CFRP) sheets as an Externally Bonded Fiber Reinforced Polymer System in order to retrofit the joint region, and to transfer the failure to the concrete beams. Six specimens in one third scale were designed, constructed, and tested. The proposed retrofitting technique proved to be very effective in improving the behavior of non-ductile beam-column joints, and to change the final mode of failure. The comparison between beam-column joints before and after retrofitting is presented in this study as exhibited by load versus deflection, load versus CFRP strain, energy dissipation, and ductility.

Author: Songchao Zhu
Publisher:
ISBN:
Category : Reinforced concrete
Languages : en
Pages : 138

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Author: Xian Zuo Xin
Publisher:
ISBN:
Category : Concrete construction
Languages : en
Pages : 242

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