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Book Evaluation and Prediction of Shear Behavior of Reinforced Concrete Beam column Joints

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.

Book Design of Beam column Joints for Seismic Resistance

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:

Book Behavior of Reinforced Concrete Exterior Wide Beam column slab Connections Subjected to Lateral Earthquake Loading

Download or read book Behavior of Reinforced Concrete Exterior Wide Beam column slab Connections Subjected to Lateral Earthquake Loading written by James Michael LaFave and published by . This book was released on 1997 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book State of the art Review of Seismic Behavior of Deficient and Retrofitted Reinforced Concrete Beam Column Joints

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.

Book Strength and Behavior of Reinforced Concrete Slab column Connections Subjected to Static and Dynamic Loadings

Download or read book Strength and Behavior of Reinforced Concrete Slab column Connections Subjected to Static and Dynamic Loadings written by Marvin E. Criswell and published by . This book was released on 1970 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this investigation were to study the strength and behavior of slowly (statically) loaded reinforced concrete slab-column connections and to determine the effect of rapid (dynamic) loading on the strength and behavior by comparison with the static test results. Nineteen full-scale models of a connection and adjoining slab area, consisting of a simply supported slab 84 or 94 inches square and 6-1/2 inches thick loaded concentrically on a 10- or 20-inch-square stub column at the center of the slab, were tested. The main variables were the amounts of reinforcement in the slab (p = 0.75 and 1.50 percent), the column size, and the loading speed. Eight specimens were loaded to failure statically, two were subjected to a very rapidly applied load of short duration, and nine were loaded to failure by a rapidly applied load with a rise time chosen to represent the conditions in a blast-loaded structure. The static test results are compared with 12 shear strength prediction methods. Differences between the mechanism of shear failure in slabs and beams are examined. (Author).

Book Experimental Investigation of the Behavior of Lightly reinforced Concrete Column and Beam column Joint Details Subjected to Seismic Loading

Download or read book Experimental Investigation of the Behavior of Lightly reinforced Concrete Column and Beam column Joint Details Subjected to Seismic Loading written by Stephen Paul Pessiki and published by . This book was released on 1990 with total page 894 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Concrete Beams with Openings

Download or read book Concrete Beams with Openings written by M. A. Mansur and published by CRC Press. This book was released on 1999-01-29 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book compiles state-of-the-art information on the behavior, analysis, and design of concrete beams containing transverse openings. Discussions include the need, effects, and classification of openings as well as the general requirements for fulfilling design pure bending, combined bending, and shear - illustrated with numerical examples torsion alone or in combination with bending and shear large rectangular openings as well as opening size and location on beam behavior methods for analyzing ultimate strength and serviceability requirements effects of torsion in beams large openings in continuous beams and their effects on possible redistribution of internal forces as well as guidelines and procedures for the design of such beams effect of prestressing on the serviceability and strength of beams with web openings design against cracking at openings and ultimate loads Concrete Beams with Openings serves as an invaluable source of information for designers and practicing engineers, especially useful since little or no provision or guidelines are currently available in most building codes.

Book Seismic Behavior of Reinforced Concrete Wide Concealed Beam narrow Column Joints

Download or read book Seismic Behavior of Reinforced Concrete Wide Concealed Beam narrow Column Joints written by Amer Mohammad Elsouri and published by . This book was released on 2011 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wide and concealed beam- narrow column joints constitute an important part of reinforced concrete building structural systems in Lebanon and the region. Because Lebanon and most of the region are seismically active, evaluating the performance of these joints when subjected to earthquake loads becomes particularly important. A two-part experimental investigation was carried out. Part 1 concentrated on evaluating the seismic response of wide and concealed beam-narrow column joints when designed and detailed under gravity load in accordance with local design and construction practices (as-built). Part 2 focussed on exploring means for improving the seismic performance of the joints through adequate reinforcement detailing, guided by the ACI Building Code. Aspects of the seismic behavior that were evaluated throughout the research program included: (i) mode of joint failure, (ii) flexural and shear capacity, (iii) bond performance of the reinforcing bars, (iv) lateral drift capacity or ductility, (v) stiffness degradation, (vi) energy absorption and dissipation capacity under cyclic loading, and (vii) shear capacity of the joint core. In the first part of the investigation (Part 1), four full-scale interior and exterior beam-column sub-assemblages were tested under quasi-static cyclic loading. All specimens experienced extensive shear cracking within the joint core, and at drift ratios between 4.0% and 4.5%, the joint core experienced damage beyond repair. It was concluded that unless detailed to prevent or limit shear failure, the as-built joints under investigation are significantly weak to be considered as part of the earthquake lateral-load-resisting system. In the second part of the investigation (Part 2), four additional full-scale joints were tested under quasi-static cyclic loading. The joints, referred to as earthquake-resistant joints, were similar to the four joints tested in Part 1, except that the reinforcement details were improved in part in accordance with ACI 318-08 provisions for earthquake-resistant structures. The joints satisfied some of the ACI Building Code design and steel detailing requirements, but still violated the dimension limitations specified in the same code or recommended by ACI-ASCE Committee 352-02. The corresponding joints displayed a considerably improved seismic performance, manifested by preventing or delaying joint shear failure, higher lateral load and drift capacities, lower stiffness degradation, larger energy dissipation capacities and stable overall hysteretic response when compared with the as-built joints. In addition to the main two parts of the investigation described briefly above, the potential of upgrading the seismic-resistant joints tested in Part 2 using a combination of epoxy injection for repairing the major cracks and carbon fiber reinforced polymers (CFRP) composites for strengthening was also explored and experimentally evaluated. The repair and strengthening procedure used in this study, which was carried out with minimum labor and cost, resulted in significant improvement of the structural performance of the damaged joints. This improved performance was manifested by substantial stiffness recovery, enhanced lateral load capacity and low strength degradation under large lateral drifts, controlled cracking and damage, and reasonable regain of energy absorption and dissipation capacity.

Book CEB FIP Model Code 1990

    CEB FIP Model Code 1990

    Book Details:
  • Author : FIB – International Federation for Structural Concrete
  • Publisher : fib Fédération internationale du béton
  • Release : 1993-01-01
  • ISBN : 0727716964
  • Pages : 462 pages

Download or read book CEB FIP Model Code 1990 written by FIB – International Federation for Structural Concrete and published by fib Fédération internationale du béton. This book was released on 1993-01-01 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: This design code for concrete structures is the result of a complete revision to the former Model Code 1978, which was produced jointly by CEB and FIP. The 1978 Model Code has had a considerable impact on the national design codes in many countries. In particular, it has been used extensively for the harmonisation of national design codes and as basic reference for Eurocode 2. The 1990 Model Code provides comprehensive guidance to the scientific and technical developments that have occurred over the past decade in the safety, analysis and design of concrete structures. It has already influenced the codification work that is being carried out both nationally and internationally and will continue so to do.

Book Constitutive Equations for Engineering Materials

Download or read book Constitutive Equations for Engineering Materials written by Wai-Fah Chen and published by Elsevier. This book was released on 2013-10-22 with total page 595 pages. Available in PDF, EPUB and Kindle. Book excerpt: Constitutive Equations for Engineering Materials, Volume 1: Elasticity and Modeling, Revised Edition focuses on theories on elasticity and plasticity of engineering materials. The book first discusses vectors and tensors. Coordinate systems, vector algebra, scalar products, vector products, transformation of coordinates, indicial notation and summation convention, and triple products are then discussed. The text also ponders on analysis of stress and strain and presents numerical analysis. The book then discusses elastic stress-strain relations. Basic assumptions; need for elastic models; isotropic linear stress-strain relations; principle of virtual work; strain energy and complementary energy density in elastic solids; and incremental relations grounded on secant moduli are described. The text also explains linear elasticity and failure criteria for concrete and non-linear elasticity and hypoelastic models for concrete. The selection further tackles soil elasticity and failure criteria. Mechanical behavior of soils; failure criteria of soils; and incremental stress-strain models based on modification of the isotropic linear elastic formulation are considered. The text is a good source of data for readers interested in studying the elasticity and plasticity of engineering materials.