Download or read book Finite Element Modeling of Reinforced Concrete Beam column Bridge Connections written by Laura N. Lowes and published by . This book was released on 1999 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling of Inelastic Behavior of RC Structures Under Seismic Loads written by P. Benson Shing and published by ASCE Publications. This book was released on 2001-01-01 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the U.S.?Japan Seminar on Post-Peak Behavior of Reinforced Concrete Structures Subjected to Seismic Loads: Recent Advances and Challenges on Analysis and Design, held in Tokyo and Lake Yamanaka, Japan, October 25-29, 1999. Sponsored by the National Science Foundation, U.S.A.; Japan Society for the Promotion of Science; Japan Concrete Institute. This collection presents the latest ideas and findings on the inelastic behavior of reinforced concrete (RC) structures from the analysis and design standpoints. These papers discuss state-of-the-art concrete material models and analysis methods that can be used to simulate and understand the inelastic behavior of RC structures, as well as design issues that can improve the seismic performance of these structures. Topics include modeling of concrete behavior; modeling of RC structures (finite element approach and macro-element approach); and experimental studies, analysis, and design issues.
Download or read book 3 D Finite Element Modeling of Reinforced Concrete Beam column Connections written by Harpreet Singh Hansra and published by . This book was released on 2012 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report, 3-D Finite Element Modeling of Reinforced Concrete Beam-Column Connections -- Development and Comparison to NCHRP 12-74, investigates the use of finite element modeling (FEM) to predict the structural response of the cast-in-place (CIP) reinforced concrete bent cap-column test specimen reported in NCHRP Report 681 -- Development of a Precast Bent Cap System for Seismic Regions. Analysis was performed using LS-DYNA as the finite element processor. The Karagozian & Case Damaged Concrete model, material MAT_072, was used as the constitutive model for all concrete elements and material MAT_003, a plastic kinematic model, was used as the constitutive model for the reinforcing steel. Strain-hardening effects of steel were neglected for this analysis. Boundary conditions on the FE model were identical to the vertical and horizontal restraints used on the CIP specimen during testing. The FE model only considered a monotonic push loading sequence, whereas the CIP specimen was subjected to reverse cyclic loading. To account for the difference in loading, the FE model results were compared to the hysteretic envelope from the CIP specimen. The lateral load-lateral displacement response of the FE model (Model 1) compared reasonably well to the actual and theoretically predicted response of the CIP specimen. For lateral displacements less than that corresponding to a displacement ductility of 4.1, the FE model showed a larger stiffness than the actual CIP response. The model stiffness degraded as a greater number of concrete elements in the column plastic hinging region accumulated damage. The degradation and lateral load-displacement response matched the predicted response within 5% for a displacement ductility larger than 2.0; however, the model degradation was not as severe as that observed for the CIP specimen. Concrete damage in the FE model correlated reasonably well with observed cracking and spalling of the CIP specimen. Significant damage was observed in the column of the FE model, near the joint, reflecting flexural cracking. Initial yielding of column longitudinal bars in the FE model occurred at a displacement ductility 26% larger than the CIP specimen. Based on contours of concrete damage and principal stress vectors, the primary shear crack formed diagonally through the joint of the FE model at a lateral load 6% higher than that of the CIP specimen. Joint rotation for the FE model was significantly less than that of the CIP specimen, approximately half of the specimen values. Conclusions include: 1) finite element modeling using appropriate constitutive models and element formulation can accurately capture the nonlinear behavior of reinforced concrete beam-column connections, including flexural cracking, joint shear cracking, steel reinforcement yielding and overall stress distribution; 2) element size for concrete and steel reinforcement significantly impacts the overall response and accuracy of results and therefore must be carefully selected for convergence; 3) the Karagozian & Case damaged concrete model, material MAT_072, can accurately capture the cracking of concrete using limited inputs (f 'c and aggregate size). Recommendations include: 1) additional analysis should be performed to appropriately incorporate a strain hardening model for the reinforcing steel; 2) strain distribution of the steel reinforcement in the joint (longitudinal reinforcement, joint hoops, and joint stirrups) should be further investigated as well as the hoop strain distribution in the column plastic hinge region; 3) a concrete constitutive model capable of reverse cyclic loading should be investigated; 4) a bar slip model for bond between the concrete and reinforcing steel should be investigated.
Download or read book Finite Element Modeling of Reinforced Concrete Beam column Bridge Connections written by Laura N. Lowes and published by . This book was released on 1999 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Finite Element Modeling of Reinforced Concrete Bridge Columns with Steel Jackets Using Plastic Hinge Integration written by Adam K. Carlton and published by . This book was released on 2008 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years confinement requirements for concrete columns have increased in seismic regions. Steel jackets are one way to confine reinforced concrete columns. The increased confinement provides additional strength and ductility for the columns during seismic events. For reinforced concrete columns with steel jackets, there are different section properties in the jacketed and non-jacketed regions. The variation can cause difficulties modeling the seismic response of these columns. A plastic hinge integration method, derived from the modified two-point Gauss-Radau quadrature rule, is used to model steel jacketed columns with force-based finite elements. This integration method allows for the specification of the plastic hinge length in the element, thereby confining the spread of material nonlinear response to selected regions. Controlling the location of material nonlinear response provides an objective numerical solution for strain-softening behavior that occurs due to the crushing of concrete. In addition, different material properties can be specified for the jacketed and non-jacketed regions, which allows for only one frame element to be used in modeling. This integration method is verified for elements with different material properties using a single force-based beam-column element. After the verification, the integration method is validated against experimental data from tests of steel jacketed reinforced concrete bridge columns conducted at the University of California at San Diego. The results of this research will be incorporated in pushover analysis software, developed at Oregon State University, for Alaska-style bridge bents.
Download or read book Experimental and Computational Evaluation of Reinforced Concrete Bridge Beam column Connections for Seismic Performance written by Clay Joshua Naito and published by . This book was released on 2001 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Finite Element Design of Concrete Structures written by Guenter Axel Rombach and published by Thomas Telford. This book was released on 2004 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Finite Element Design of Concrete Structures: practical problems and their solutions the author addresses this blind belief in computer results by offering a useful critique that important details are overlooked due to the flood of information from the output of computer calculations. Indeed, errors in the numerical model may lead in extreme cases to structural failures as the collapse of the so-called Sleipner platform has demonstrated.
Download or read book Use of Finite Element Modeling for Condition Assessment of Reinforced Concrete Bridge Columns in Structural Health Monitoring written by Vahid Zanjanizadeh and published by . This book was released on 2009 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Bridges are very important in public transportation because vast revenue resources are consumed in building bridges, and the need to maintain these structures to be continuously operational. In addition, bridges deteriorate with time like any other structure. The causes could be chemical attack, overloading, environmental effects, corrosion of steel reinforcement and quality of maintenance. Hence, they require health monitoring and structural evaluation periodically. Structural health monitoring (SHM) holds a great deal of potential to reduce the inspection and maintenance costs of existing bridges by identifying the structural deficiencies at an early stage, as well as verifying the efficacy of repair or rehabilitation procedures. Most of the SHM research focused is on the bridge deck and girders, and there appears to be no focused study on condition assessment of bridge columns despite bridge columns being more vulnerable against corrosion, and susceptible to vehicle collisions. This research consists of investigation of methodologies for full scale finite element modeling of bridges subjected to moving truck loads using a commercial package called ABAQUS/standard. Moving load induced by two standard AASHTO trucks was developed through load-time history that was applied on 35 nodes on the bridge deck. Modal analysis followed by an implicit dynamic analysis was carried out to study the dynamic behavior of bridges under moving load. The selected bridge was Westbound Ronald Reagon cross country highway (SR126) bridge, HAM-126-0881, over Hamilton Avenue (Route 4) in Cincinnati, Ohio. It is a typical three-span steel-girder reinforced concrete bridge. The results of finite element analysis are validated with data collected in field SHM tests conducted on this bridge through wired sensor network by another research group. Additionally, the influence of several parameters such as variations in truck loads and the corresponding speeds, damping rations of the bridge, and the possible variations in material properties of concrete on dynamic response of bridges was studied using finite element modeling. Good agreement was found between the field measurement and the response predicted by the finite element simulations. Most concerned dynamic response was strains at different locations in bridge girders and columns, because it is a significant item that can be measured with confidence during structural health monitoring field tests. Particularly, the strain response of the columns due to moving loads was evaluated in this study. The study revealed that the columns have considerable influence on dynamic behavior of the bridges. Also, the range of the strains in the column was found to be very small (20 to 100 micro). This strain range may be used in sensor designs for SHM field tests. By increasing truck speed and weight, the response of the bridge in terms of strains and accelerations increased. However, the effect of the damping was quite the opposite, i.e., by increasing the damping ratio, the response of the bridge reduced. The effect was in the form of smoothing the response curves than decreasing the global response."--Abstract.
Download or read book Finite Element Modeling of Reinforced Concrete Bridge Decks with ABAQUS written by Ganesh Thiagarajan and published by . This book was released on 2005 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Finite Element Modeling of Skewed Reinforced Concrete Bridges and the Bond slip Relationship Between Concrete and Reinforcement written by and published by . This book was released on 2007 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Finite Element Analysis of Prestressed Concrete Structures Using Post Tensioning Steel written by Yu Huang and published by Cambridge Scholars Publishing. This book was released on 2020-05-28 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book details the theory and applications of finite element (FE) modeling of post-tensioned (PT) concrete structures, and provides the updated MATLAB code (as of 2019). The challenge of modeling PT prestressed concrete structures lies in the treatment of the interface between the concrete and prestressing tendons. Using MATLAB, this study develops an innovative nonlinear FE formulation which incorporates contact techniques and engineering elements to considerably reduce the need of computational power. This FE formulation has the ability to simulate different PT frame systems with fully bonded, fully unbonded or partially bonded tendons, as well as actual sliding behavior and frictional effects in the tendons. It also allows for the accurate simulation of anchor seating loss.
Download or read book Finite Element Modeling of Reinforced Concrete Beams Externally Strengthened by FRP Composites written by Tanarat Potisuk and published by . This book was released on 2000 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three-dimensional finite element models are developed to simulate the behavior of four fill-scale reinforced concrete beams. The beams are constructed with different fiber-reinforced polymer (FRP) strengthening schemes, and are modeled using ANSYS, a commercially available finite element analysis program. The experimental beams replicate the transverse beams of the Horsetail Creek Bridge, and were constructed and tested at Oregon State University. The finite element models use a smeared cracking approach for the concrete and three-dimensional layered elements to model the FRP composites. It was found that the finite element models could effectively simulate the behavior of the full-scale beams. Results obtained from the finite element analysis are presented and compared with the experimental data from the full-scale beam tests through the linear and nonlinear ranges up to failure. Comparisons are made for load-strain plots, load-deflection plots, first cracking loads, loads at failure, and crack patterns at failure. The results from the finite element analysis show good agreement with those from the experimental data and support hand calculation predictions for the experiment very well. The crack patterns at failure predicted by the finite element program strongly corroborate the failure modes observed for the full-scale beam tests. Recommendations for finite element modeling improvement are included.
Download or read book Finite Element Analysis of Multi channel beam Bridges written by XiaoPeng Qin and published by . This book was released on 2001 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, deterioration in a large number of precast concrete deck bridges (PCDBs) has become a concern. To study the possible reductions in their load carrying capacities, a number of laboratory and field tests were conducted by Iowa State University. Theoretical analysis, the topic of this paper, was performed to verify the testing results. The PCDBs tested are composed of reinforced concrete channel beams, named multi-channel-beam bridges. A literature review was performed to investigate various analytical methods used to analyze multibeam bridges. The finite element method was used for this analytical task. ANSYS, a general finite element software program, was used to analyze the bridges and bridge components that were experimentally tested. Individual channel beams were modeled and compared to laboratory testing results and to ACI code calculations. Several different models were developed and two in particular were appropriate. One model accurately simulates multibeam bridges with bolt connections only. Another model is appropriate to model multibeam bridges with bolt and pipe connections. A sensitivity study was performed to verify models. The same models noted above were used to analyze the field bridges with bolt connections and with bolt and pipe connections, respectively, Analytical results were compared to field load tests. Load distribution factors of the bridges were determined and compared to the AASHTO LRFD specifications.
Download or read book Finite Element Analysis and Design of Web flange Connections in Reinforced Concrete Beams microform written by Abdul Ghani Razaqpur and published by National Library of Canada. This book was released on 1982 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Efficient Finite Element Modeling of Reinforced Concrete Columns Confined with Fiber Reinforced Polymers written by Dan Hu and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Finite Element Modeling and Analysis of Reinforced concrete Bridge Decks written by and published by . This book was released on 2000 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite its long history, the finite element method continues to be the predominant strategy employed by engineers to conduct structural analysis. A reliable method is needed for analyzing structures made of reinforced concrete, a complex but common ingredient in many bridges in Virginia. As an effective alternative to extensive experimentation, this study was implemented to evaluate the plausibility of finite element analysis of reinforced-concrete bridge decks. Analytical evaluations were performed with the commercial, general-purpose finite element code ABAQUS, which can effectively depict the nonlinear behavior of concrete. It also has the unique capability of describing the behavior of reinforcing bars independently of the concrete material. Three-dimensional finite element models were developed to determine the overall structural response of several reinforced-concrete systems. Biaxial strain distribution through the element thickness, longitudinal normal girder strains, and displacements were predicted with reasonable accuracy. The accuracy of the model was verified with hand calculations or response data acquired from laboratory testing.
Download or read book Finite Element Modeling of Reinforced Concrete Beams Strengthened with FRP Composite Sheets written by Minglei Jia and published by . This book was released on 2003 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
