Download or read book State of the art Review of Seismic Behavior of Deficient and Retrofitted Reinforced Concrete Beam Column Joints written by Robert B. Lotus and published by . This book was released on 2011 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beam-column joint is considered a critical region in a structure when subjected to seismic load. Past earthquakes have shown that many of these structures behaved poorly and exhibited a combination of brittle failure at the joint and pullout of the beam longitudinal steel, leading to a rapid degradation of the joint and a precursor to a catastrophic collapse of a structure. Review of existing structures built prior to 1976 have determined concrete joints typically have little or no transverse reinforcement, discontinuous bottom beam reinforcement with insufficient embedment depth, and a common occurrence of column lap splice above the beam-column interface. Previous studies of rebar bond slip behavior, joint shear response, and joint interface - shear response were reviewed culminating in a study of various joint models simulating the behavior of deficient concrete beam-column joint subjected to a seismic load. An experimental test program consisting of three specimens was developed to test the behavior of deficient concrete beam-column joints. Specimen AB1 consists of deficient shear reinforcement at the joint, and will be tested to evaluate the behavior of a deficient reinforced concrete beam-column joint solely on insufficient shear reinforcement. Specimen AB2 is designed according to pre-1976 building standard and lacks sufficient rebar embedment of longitudinal beam reinforcement at the joint and has no shear reinforcement within the joint area. Specimen ACI318 is designed per the specifications of ACI 318-08, and will be used as the control specimen. Experimental results of the test program will eventually be applied as a baseline comparison to proposed state-of-the-art retrofit schemes aimed at enhancing the overall seismic performance of deficient reinforced concrete beam-column joints.
Download or read book Seismic Assessment and Retrofit of Reinforced Concrete Buildings written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2003-08-01 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: In most parts of the developed world, the building stock and the civil infrastructure are ageing and in constant need of maintenance, repair and upgrading. Moreover, in the light of our current knowledge and of modern codes, the majority of buildings stock and other types of structures in many parts of the world are substandard and deficient. This is especially so in earthquake-prone regions, as, even there, seismic design of structures is relatively recent. In those regions the major part of the seismic threat to human life and property comes from old buildings. Due to the infrastructure's increasing decay, frequently combined with the need for structural upgrading to meet more stringent design requirements (especially against seismic loads), structural retrofitting is becoming more and more important and receives today considerable emphasis throughout the world. In response to this need, a major part of the fib Model Code 2005, currently under development, is being devoted to structural conservation and maintenance. More importantly, in recognition of the importance of the seismic threat arising from existing substandard buildings, the first standards for structural upgrading to be promoted by the international engineering community and by regulatory authorities alike are for seismic rehabilitation of buildings. This is the case, for example, of Part 3: Strengthening and Repair of Buildings of Eurocode 8 (i. e. of the draft European Standard for earthquake-resistant design), and which is the only one among the current (2003) set of 58 Eurocodes attempting to address the problem of structural upgrading. It is also the case of the recent (2001) ASCE draft standard on Seismic evaluation of existing buildings and of the 1996 Law for promotion of seismic strengthening of existing reinforced concrete structures in Japan. As noted in Chapter 1 of this Bulletin, fib - as CEB and FIP did before - has placed considerable emphasis on assessment and rehabilitation of existing structures. The present Bulletin is a culmination of this effort in the special but very important field of seismic assessment and rehabilitation. It has been elaborated over a period of 4 years by Task Group 7.1 Assessment and retrofit of existing structures of fib Commission 7 Seismic design, a truly international team of experts, representing the expertise and experience of all the important seismic regions of the world. In the course of its work the team had six plenary two-day meetings: in January 1999 in Pavia, Italy; in August 1999 in Raleigh, North Carolina; in February 2000 in Queenstown, New Zealand; in July 2000 in Patras, Greece; in March 2001 in Lausanne, Switzerland; and in August 2001 in Seattle, Washington. In October 2002 the final draft of the Bulletin was presented to public during the 1st fib Congress in Osaka. It was also there that it was approved by fib Commission 7 Seismic Design. The contents is structured into main chapters as follows: 1 Introduction - 2 Performance objectives and system considerations - 3 Review of seismic assessment procedures - 4 Strength and deformation capacity of non-seismically detailed components - 5 Seismic retrofitting techniques - 6 Probabilistic concepts and methods - 7 Case studies
Download or read book Seismic Behavior and Retrofit of Older Reinforced Concrete Bridge T joints written by Laura N. Lowes and published by . This book was released on 1995 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of experimental tests investigating the seismic response of reinforced concrete beam-column T-joints was recently completed at the University of California, Berkeley. The evaluated connection was representative of an interior beam- column joint from a multi-column bridge frame built in the late 1950's. Three one-third scale models, representing the as-built connection and two retrofit connections, were tested. The results of this research project are an improved understanding of the seismic behavior of lightly reinforced bridge T-joints as well as verification of a design procedure for retrofitting this type of connection.
Download or read book RC Structures Strengthened with FRP for Earthquake Resistance written by Shamsher Bahadur Singh and published by Springer Nature. This book was released on with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismic Assessment and Retrofit of Reinforced Concrete Columns written by Konstantinos G. Megalooikonomou and published by Cambridge Scholars Publishing. This book was released on 2019-02-27 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reinforced concrete columns play a very important role in structural performance. As such, it is essential to apply a suitable analytical tool to estimate their structural behaviour considering all failure mechanisms such as axial, shear, and flexural failures. This book highlights the development of a fiber beam-column element accounting for shear effects and the effect of tension stiffening through reinforcement-to-concrete bond, along with the employment of suitable constitutive material laws.
Download or read book Seismic Performance of Corroded Reinforced Concrete Structures Retrofitted with FRP written by Dejian Shen and published by Springer Nature. This book was released on with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismic Behavior Strength and Retrofit of Exterior RC Column to steel Beam Connections written by Gustavo Parra-Montesinos and published by . This book was released on 2000 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The 15th International Conference Interdisciplinarity in Engineering written by Liviu Moldovan and published by Springer Nature. This book was released on 2022-02-02 with total page 869 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains research papers that were accepted for presentation at the 15th International Conference on Interdisciplinarity in Engineering—INTER-ENG 2021, which was held on October 7–8, 2021, in the city of Târgu Mureș, Romania. The general scope of the conference “Innovative aspects of Industry 4.0 concepts aimed at consolidating the digital future of manufacturing in companies” is proposing a new approach related to the development of a new generation of smart factories grounded on the manufacturing and assembly process digitalization. It is related to advance manufacturing technology, lean manufacturing, sustainable manufacturing, additive manufacturing, and manufacturing tools and equipment. It is a leading international professional and scientific forum of great interest for engineers and scientists who can read in this book research works contributions and recent developments as well as current practices in advanced fields of engineering.
Download or read book Seismic Behavior of Eccentric Reinforced Concrete Beam column slab Connections written by Burcu Burak and published by . This book was released on 2005 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation and Prediction of Shear Behavior of Reinforced Concrete Beam column Joints written by Firat Alemdar and published by . This book was released on 2007 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Design of Beam column Joints for Seismic Resistance written by James Otis Jirsa and published by . This book was released on 1991 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cyclic Response of RC Beam column Knee Joints written by Silvia Mazzoni and published by . This book was released on 1991 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismic Behaviour of Deficient Exterior RC Beam column Joints written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismic Behavior of Lightly reinforced Concrete Column and Beam column Joint Details written by and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismic Behavior of RCS Beam column Subassemblies and Frame Systems Designed Following a Joint Deformation based Capacity Design Approach written by Xuemei Liang and published by . This book was released on 2003 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismic Evaluation of Joints Before and After Retrofitting written by Ankit Gupta and published by LAP Lambert Academic Publishing. This book was released on 2012-04 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthquakes have shown that seismically deficient RC frames are particularly vulnerable to seismic action. Direct observation of damaged structures has shown that damage occurs usually at the beam-column joints with failure in bending or shear, depending on geometry and reinforcement distribution and type. After earthquake structures were classified as slightly damaged, thus being uneconomic to replace them, at least in the short term. For this reason suitable means of repairs of the beam column joint area are being studied. This book highlights the cyclic tests carried out on beam-column joint specimens, with different configurations of steel reinforcement detailing and strengthening by external FRP wrapping. One specimen was designed to comply with gravity load design code and the other with ductile detailing. Analytical modeling of the same was done with the help of the FEM package and its behavior with the actual one is compared. Strength and ductility of the undamaged and retrofitted specimens were compared. Behavior of confined specimen is also compared with the unconfined one. Effect of FRP wrapping is discussed as a viable option for restoring the strength of joints.
Download or read book The Behavior of Fiber Reinforced Concrete Beam column Joints Subjected to Earthquake type Loading written by Paul Robert Gefken and published by . This book was released on 1986 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
