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Shear Behavior Of Lightweight Concrete Columns Under Seismic Conditions
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Book Synopsis Shear Behavior of Lightweight Concrete Columns Under Seismic Conditions by : M. J. Kowalsky
Download or read book Shear Behavior of Lightweight Concrete Columns Under Seismic Conditions written by M. J. Kowalsky and published by . This book was released on 1995 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is the first in a series of reports on the seismic performance of lightweight concrete bridge substructure elements. Through a discussion of experimental studies on two test units and analytical investigations, the shear capacity of lightweight concrete bridge columns subjected to cyclic loading is presented. Also presented in this report is a revised model for quantifying the contribution of transverse steel to shear strength that is applicable to both lightweight and normal weight concrete. An alternative method for the evaluation of shear deformation for design and assessment purposes is presented which is also applicable to lightweight and normal weight concrete members.
Book Synopsis Flexural Behavior of Lightweight Concrete Columns Under Seismic Conditions by : Mervyn J. Kowalsky
Download or read book Flexural Behavior of Lightweight Concrete Columns Under Seismic Conditions written by Mervyn J. Kowalsky and published by . This book was released on 1996 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shear Performance of Reinforced Lightweight Concrete Square Columns in Seismic Regions by :
Download or read book Shear Performance of Reinforced Lightweight Concrete Square Columns in Seismic Regions written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Considering the importance of shear capacity under seismic demands, clarifying existing differences between analytical models and existing experimental data, further experimental research on shear performance of reinforced lightweight concrete (RLWC) square columns signifies a current necessity for the civil engineering community. Responding to that necessity and in contrast to the majority of past research that considered monotonic loading, this research evaluated the performance of eight normal strength RLWC large scale square columns, under reversed cyclic loading, simulating earthquake demands, and considering shear failure mechanisms. The variables consisted of different types of aggregate for the concrete mixtures and two sets of specimens with different amount of transverse reinforcement. Moreover, one normal weight and three lightweight structural aggregates such as expanded shale, clay, and slate were considered in order to represent the production in the United States. Two sets of four specimens were designed to develop brittle and ductile shear failures at low and high levels of deformation respectively. A comparative analysis between normal, lightweight concrete, experimental, and analytical data was performed focusing on the shear resistance mechanism and behavior under simulated seismic demands. Shear resistance and deformation components were obtained to determine the difference between lightweight and normal weight concrete shear strengths and behavior at different levels of deformation. In general, results consistently revealed that, at low levels of deformation, the concrete shear strength component was lower in the case of lightweight concrete compared to normal weight concrete. Consequently, a shear strength reduction is recommended for normal strength RLWC square columns compared to capacity assessment models for normal weight concrete. Strength degradation, at low levels of deformation, occurred earlier in the case of RLWC compared to normal we.
Book Synopsis Shear Performance of High-Strength Lightweight Concrete Columns Under Seismic Loads by :
Download or read book Shear Performance of High-Strength Lightweight Concrete Columns Under Seismic Loads written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Behavior of Lightweight Concrete Columns by : Basile G. Rabbat
Download or read book Seismic Behavior of Lightweight Concrete Columns written by Basile G. Rabbat and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shear Performance of High-strength Lightweight Concrete Columns Under Seismic Loads by : Serena Elaine Hendrix
Download or read book Shear Performance of High-strength Lightweight Concrete Columns Under Seismic Loads written by Serena Elaine Hendrix and published by . This book was released on 2008 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: rectangular columns, lightweight concrete, high-strength concrete,
Book Synopsis Seismic Shear Behavior and Design of Reinforced Concrete Columns with High-strength Reinforcement and Concrete by : 阮文寶元
Download or read book Seismic Shear Behavior and Design of Reinforced Concrete Columns with High-strength Reinforcement and Concrete written by 阮文寶元 and published by . This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Behavior of Bridge Shear Columns Subjected to Near Field Pulse Loading by : Brett Makley
Download or read book Seismic Behavior of Bridge Shear Columns Subjected to Near Field Pulse Loading written by Brett Makley and published by . This book was released on 2001 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Sand Lightweight Concrete Beam-column Joints Subjected to Quasi-static Loading by : Curtis L. Decker
Download or read book Investigation of Sand Lightweight Concrete Beam-column Joints Subjected to Quasi-static Loading written by Curtis L. Decker and published by . This book was released on 2012 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of sand-lightweight concrete made with expanded shale aggregate is prevalent throughout the United States and other developed countries. Sand-lightweight concrete is approximately twenty percent lighter than its normalweight counterpart. Lateral earthquake forces applied to a building structure are directly proportional to its mass, so the potential for better seismic performance is clear. Unfortunately, concrete made with lightweight aggregate behaves differently in key aspects when compared to normalweight concrete that can negate its design force reducing advantage. Specifically, lightweight concrete is more brittle in nature than normalweight concrete and as such is less ductile. Ductility is key in seismic design because the structure must be able to absorb the energy produced by the earthquake. This study focused on determining the particular behavior of reinforced sand-lightweight concrete beam-column joints of moment frame buildings under a quasi-static cyclical loading that simulated a seismic event. Six half-scale experimental test specimens and sixty-five non-linear finite element models were used to evaluate the performance of the joints. The experimental portion of this study found that if designed and detailed in accordance with ACI 318-11 standards and if joint shear stress is kept within a reasonable limit, sand-lightweight beam column joints can perform as well as similarly built normalweight concrete specimens. This finding was true even for concrete compressive strengths up to 8000 pounds per square inch. The parametric finite element modeling portion of this study showed the effect on joint performance by varying the following four key parameters: the compressive strength of concrete, the amount of joint shear reinforcement, the longitudinal beam steel reinforcement ratio, and the axial load applied to the column.
Book Synopsis Modeling the Post Shear Failure Behavior of Reinforced Concrete Columns by : Matthew Ronald LeBorgne
Download or read book Modeling the Post Shear Failure Behavior of Reinforced Concrete Columns written by Matthew Ronald LeBorgne and published by . This book was released on 2012 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerous reinforced concrete buildings vulnerable to earthquake induced collapse have been constructed in seismic zones prior to the 1970s. A major contributor to building collapse is the loss of axial load carrying capacity in non-seismically detailed columns. Experimental investigations have shown that non-seismically detailed columns will only experience axial failure after shear failure and subsequent lateral shear strength degradation have occurred. Therefore, column shear failure and degrading behavior must be modeled accurately before axial collapse algorithms can be properly implemented. Furthermore, accurate modeling of the degrading lateral-load behavior of columns is needed if lateral load sharing between structural elements is to be assessed with reasonable accuracy during seismic analyses. A calibrated analytical model was developed that is capable of estimating the lateral strength degrading behavior of RC columns prone to shear failure. Existing analytical models poorly approximate nonlinear column behavior and require several nonphysical damage parameters to be defined. In contrast, the proposed calibrated model provides the engineering community with a valuable tool that only requires the input of column material and geometric properties to simulate column behavior up to loss of lateral strength. In developing the model, a database of RC columns was compiled. Parameters extracted from database column-tests were scrutinized for trends and regression models relating damage parameters to column physical properties and boundary conditions were produced. The regression models were implemented in the degrading analytical framework that was developed in this project. Two reinforced concrete columns exhibiting significant inelastic deformations prior to failing in shear were tested in support of the analytical work. A newly developed Vision System was used to track a grid of targets on the column face with a resolution of three-thousands of an inch. Surface column deformations were measured to further the understanding of the fundamental changes in column behavior that accompany shear and axial failure and validate the proposed analytical model. This research provides the engineering community with an analytical tool that can be used to perform nonlinear dynamic analysis of buildings that are at risk of collapse and help engineers improve retrofit techniques. Further insight into shear behavior attained through this project is an important step toward the development of better shear and axial degradation models for reinforced concrete columns.
Book Synopsis Shear Performance of Reinforced Lightweight Concrete Square Columns in Seismic Regions by : Pablo José Robalino
Download or read book Shear Performance of Reinforced Lightweight Concrete Square Columns in Seismic Regions written by Pablo José Robalino and published by . This book was released on 2006 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: reversed loading, large scale tests, columns, shear, seismic demands, lightweight concrete.
Book Synopsis Shear Behavior of High Strength Steel Fiber Reinforced Concrete Columns by : 韋思拿
Download or read book Shear Behavior of High Strength Steel Fiber Reinforced Concrete Columns written by 韋思拿 and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Behavior and Modeling of Reinforced Concrete Building Columns by : Halil Sezen
Download or read book Seismic Behavior and Modeling of Reinforced Concrete Building Columns written by Halil Sezen and published by . This book was released on 2002 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Visual Inspection & Capacity Assessment of Earthquake Damaged Reinforced Concrete Bridge Elements by :
Download or read book Visual Inspection & Capacity Assessment of Earthquake Damaged Reinforced Concrete Bridge Elements written by and published by . This book was released on 2008 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Design and Performance of Concrete Multi-column Bents for Bridges by : Sri Sritharan
Download or read book Seismic Design and Performance of Concrete Multi-column Bents for Bridges written by Sri Sritharan and published by . This book was released on 1997 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the seismic design and performance of two concrete multi-column bents. The first unit contained a precast fully prestressed cap beam while the second unit was designed with a reinforcement concrete cap beam. A mix of conventional and headed reinforcement and mechanical couplers were used in detailing the cap beam of the second unit. Tests were performed with the objective of examining the most efficient cap beam/column details, which were established in previous joint tests, under the maximum feasible shear demand. Tests results showed that both units produced a satisfactory response when subjected to simulated seismic loading.
Book Synopsis Proceedings of the Fourth Caltrans Seismic Research Workshop by :
Download or read book Proceedings of the Fourth Caltrans Seismic Research Workshop written by and published by . This book was released on 1996 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling of Lightly Confined Reinforced Concrete Columns Subjected to Lateral and Axial Loads by : Jinsong Fan
Download or read book Modeling of Lightly Confined Reinforced Concrete Columns Subjected to Lateral and Axial Loads written by Jinsong Fan and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The collapse of most non-ductile reinforced concrete buildings is caused by the loss of column support under gravity loads when subjected to lateral seismic loads. Although some modeling approaches of reinforced concrete columns can generate a reasonably accurate prediction of flexural response, the determination of shear displacement still needs further developments. Very few models could accurately simulate the shear failure and axial collapse of non-ductile columns under seismic loading. This dissertation focuses on the development of more accurate lateral displacement models including more focus on flexure-shear interaction for total lateral deformation response of lightly confined reinforced concrete columns. Experimental studies and post-earthquake reconnaissance demonstrated that reinforced concrete columns with light or widely spaced transverse reinforcement are vulnerable to shear failure and axial failure during earthquakes. Based on experimental results, a critical crack surface is selected to analyze and predict the onset of axial failure for damaged columns. When the lateral response of the column reaches the failure limit, the shear or axial strength begins to degrade. This research proposes two simplified analytical models that incorporate the shear failure and axial load failure limit state for predicting ultimate lateral displacements. An analytical model is developed to estimate the shear strength degradation and shear displacement at shear failure. Accordingly, a modified shear response envelope of shear-critical columns is proposed to predict shear behavior after peak shear strength is reached. The proposed model for calculating ultimate shear displacement is implemented and compared to experimental data. Another analytical model is developed to predict lateral displacements at axial load failure. Shear friction mechanisms are introduced to analyze the force equilibrium condition at the onset of axial load failure along a critical crack surface of the damaged column. Parametric studies are carried out to investigate and identify the most relevant factors used in calculations. The calculated results show that the proposed models can predict the lateral load-lateral displacement relationship of the test specimens with reasonable accuracy. A modified method is presented to calculate the total lateral displacements as a combination of flexure, longitudinal bar slip, and shear components. Comparison of the calculated response and experimental data show that the axial-shear-flexure interaction approach is basically suited to predict the lateral response of RC columns dominated by shear or shear-flexure failure.
