Download or read book Reinforced Concrete Structures under Cyclic Loading written by Farhad Aslani and published by Trans Tech Publications Ltd. This book was released on 2015-03-14 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental programs in laboratories give real results to identify nonlinear behavior of reinforced concrete (RC) structures but they are limited to knowledge of particular cases under restricted structural dimensions, sizes, shapes, loading and boundary conditions but the computational simulation approach has no limit to its application. Constitutive models are developed to simulate the dynamic nonlinear response of concrete and steel reinforcement subjected to cyclic loading varying randomly in magnitude. The behavior of structural concrete under monotonic loading is affected by important material aspects including cracking, crushing, tension stiffening, compression softening and bond slip. Reversed cyclic loading introduces further complexities such as stiffness degradation in concrete and the Bauschinger effect in reinforcing steel. In this research the validity and reliability of some proposed constitutive models for concrete considering general loading i.e. cyclic, monotonic, partial, common point and transition loading are evaluated. Amongst many existing constitutive models, because of their simplicity and common usage in the finite element analysis of RC structures, only some common proposed models based on nonlinear elasticity-based approach are investigated. These models are verified against experimental data available in the literature and the results are discussed. In this study, also, a hysteretic stressstrain model is developed for unconfined concrete with the intention of providing efficient modeling for the structural behavior of concrete in seismic regions. The proposed model is based on the findings of previous experimental and analytical studies. The model for concrete subjected to monotonic and cyclic loading, comprises four components in compression and tension; an envelope curve (for monotonic and cyclic loading), an unloading curve, a reloading curve, and transition curve. Also presented are formulations for partial unloading and partial reloading curves. The proposed Constitutive model reliability is investigated by RC members non-linear finite element analysis (FEM) using by finite element software ABAQUS. Comparisons with test results showed that the proposed model provides a good fit to a wide range of experimentally established hysteresis loops.
Download or read book A Contribution to the Analysis of Concrete Structures Under Cyclic Loading written by Richard Wayne Litton and published by . This book was released on 1975 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strain Development in Concrete Under Cyclic Loading written by Marek Foglar and published by LAP Lambert Academic Publishing. This book was released on 2010-04 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue is a process of permanent progressive changes in the structure of a material exposed to cyclic loading. High stress ranges in structures like bridges or crane-ways can result into accelerated crack propagation, higher deflections, structural stiffness reduction and consequently into fatigue failure. Bridge decks with damaged or missing insulation, crane-ways in industrial environment, bridge piers adjacent to roads maintained with the use of de-icing salts, maritime structures subjected to wave impact load cycles or cyclic loaded foundations of industrial machinery are exposed to cyclic loading and deteriorative solutions at the same time. In this text, the state-of-art in the field of fatigue of concrete structures is presented together with a brief introduction to deterioration of concrete. On hand of this information a way of describing the strain development under cyclic loading - the fatigue damage function - is proposed and experimentally verified on pre-stressed and reinforced concrete specimens. The way of incorporating the effect of material deterioration in this approach is shown.
Download or read book Investigation of Reinforced Concrete Beam column Joints Under Reversed Cyclic Loading written by Aly Marei Said and published by . This book was released on 2004 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical and Computer Methods in Structural Mechanics written by Steven J. Fenves and published by Elsevier. This book was released on 2014-05-10 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical and Computer Methods in Structural Mechanics is a compendium of papers that deals with the numerical methods in structural mechanics, computer techniques, and computer capabilities. Some papers discus the analytical basis of the computer technique most widely used in software, that is, the finite element method. This method includes the convergence (in terms of variation principles) isoparametrics, hybrid models, and incompatible displacement models. Other papers explain the storage or retrieval of data, as well as equation-solving algorithms. Other papers describe general-purpose structural mechanics programs, alternatives to, and extension of the usual finite element approaches. Another paper explores nonlinear, dynamic finite element problems, and a direct physical approach to determine finite difference models. Special papers explain structural mechanics used in computing, particularly, those related to integrated data bases, such as in the Structures Oriented Exchange System of the Office of Naval Research and the integrated design of tanker structures. Other papers describe software and hardware capabilities, for example, in ship design, fracture mechanics, biomechanics, and crash safety. The text is suitable for programmers, computer engineers, researchers, and scientists involved in materials and industrial design.
Download or read book Behavior and analysis of reinforced concrete structures under alternate actions inducing inelastic response written by FIB – International Federation for Structural Concrete and published by FIB - International Federation for Structural Concrete. This book was released on 1991-07-01 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strain Hardening Cement Based Composites written by Viktor Mechtcherine and published by Springer. This book was released on 2017-09-04 with total page 811 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the proceedings of the 4th International Conference on Strain-Hardening Cement-Based Composites (SHCC4), that was held at the Technische Universität Dresden, Germany from 18 to 20 September 2017. The conference focused on advanced fiber-reinforced concrete materials such as strain-hardening cement-based composites (SHCC), textile-reinforced concrete (TRC) and high-performance fiber-reinforced cement-based composites (HPFRCC). All these new materials exhibit pseudo-ductile behavior resulting from the formation of multiple, fine cracks when subject to tensile loading. The use of such types of fiber-reinforced concrete could revolutionize the planning, development, dimensioning, structural and architectural design, construction of new and strengthening and repair of existing buildings and structures in many areas of application. The SHCC4 Conference was the follow-up of three previous successful international events in Stellenbosch, South Africa in 2009, Rio de Janeiro, Brazil in 2011, and Dordrecht, The Netherlands in 2014.
Download or read book Testing of 3 D Shear Wall Under Cyclic Loading written by Daniel Palermo and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book RC Elements Under Cyclic Loading written by Comité euro-international du béton and published by Thomas Telford. This book was released on 1996 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text provides a review of relevant knowledge in the area of constitutive modelling of concrete steel bonds and their interaction. It discusses the problems encountered in assembling the various elements with the purpose of constructing the model of an element made of reinforced concrete. Whether physically or empirically based, very simple or sophisticated, long-established or brand new, the models presented in this book are produced in as rational a framework as possible, and are accompanied by comments on their advantages and limitations.
Download or read book Behaviour of Reinforced Concrete Under Cyclic Loading written by Kardiyono Tjokrodimuljo and published by . This book was released on 1985 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Durability of Concrete Structures and Constructions written by L.M. Poukhonto and published by CRC Press. This book was released on 2003-01-01 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: General principles of durability design of reinforced concrete structures: State of the art; Structural features of engineering installations for storage of dry materials and liquids; Analysis of defects and damages in reinforced concrete silos, bunkers, and reservoirs in service; Analysis of main degradation processes in concrete and reinforced concrete structures of engineering installations; Analysis of models of durability for the main degradation processes in concrete and reinforcement ; Investigation of statistical parameters of operational loads in engineering structures; Experimental and theoretical investigation of strength of reinforced concrete members of engineering structures under sustained low-cycle loading; Durability design of reinforced concrete structures of engineering installations based on the Limit State Method; Application of Finite Element Method in numerical investigation of durability of reinforced concrete silos; Practical methods of enhancing durability of reinforced concrete structures of engineering installations service; Conclusion; Index.
Download or read book Stiffness Degredation of Reinforced Concrete Members Subjected to Cyclic Flexural Moments written by Vitelmo V. Bertero and published by . This book was released on 1969 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling of Cyclic Crack Propagation in Concrete Using the Scaled Boundary Finite Element Method written by Omar Alrayes and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many concrete structures, such as bridges and wind turbine towers, fail mostly due to fatigue following cyclic loading where the cracks are initiated and propagate under cyclic loading. Therefore, a detailed analysis of the fatigue behaviour and the associated crack propagation is required for the economical and reliable design of concrete structures. Damage due to fatigue can be divided into different categories dependent on the loading conditions as well as other environmental conditions. These types of fatigue are high cyclic fatigue loading with more than 1000 load cycles. The type of low cyclic fatigue has less than 1000 cycles. The very low cyclic loading for a specific number of cycles (i.e. 10 cycles). The application of the vehicles load vibration is classified under high cyclic fatigue caused by small elastic strains under high number of load cycles. The earthquake loading is classified under the low cycle fatigue type. Also, the corrosion fatigue failure in reinforcement concrete structure occurs under moisture cyclic loading. Different combinations of the above fatigue types can occur. The deterioration process is related to the type of load frequency which results in loss of material stiffness. This work's focus is developing a new approach that predicts crack growth and damage accumulation within the cohesive response of very low cyclic crack propagation in concrete members. The advanced studies on cyclic crack propagation for concrete are primarily empirical, where a large number of data samples from experiments are used for fitting the numerical simulation. Many approaches as Paris law used to predict fatigue life and crack growth rate. However, it has been shown that such phenomenological law loses much of its prediction ability for numerical implementation since the crack grow very slowly and cyclic damage zone is not detected for large part of concrete life. In the numerical approximation framework in literature, the Cohesive Zone Model (CZM) has been implemented to simulate the material damage and crack propagation under monotonic loading. Concerning cyclic loading scenarios, however, the prediction of crack propagation is still limited mainly by the analysis method mentioned. For concrete material, the damage models whose localization is governed numerically by finite element simulation, are aimed to simulate the propagation of fracture in cohesive process zone under monotonic loading. However, these types of models are used to determine the damage only along the loading/unloading paths. Several modelling approaches in finite element (FEM) for crack propagation under cyclic and fatigue loading are well documented in the literature. The CZM has been implemented in classical fracture mechanics to reduce the mesh quality required for crack simulation. Many models in the literature are dedicated to simulating the quasi-brittle behaviour, including a set of constitutive equations for monotonic, fatigue and hysterical material response. Furthermore, several calculation schemes are also done to predict tensile, flexural monotonic, and fatigue material behaviour. However, a damage accumulation process for concrete energy dissipation under random cycles is required. One of the most important implementations of the SBFEM approach is to model crack nucleation, and propagation under general loading conditions. The cohesive fracture and stress field can be determined using interface elements with zero-thickness, which were inserted directly into the SBFEM for only monotonic loading. Furthermore, the cohesive traction forces close to the crack tip are accurately computed as it is defined analytically. This enables to predict the crack path and to obtain the correct load-deflection response for different load scenarios. In the present work, a novel crack cyclic damage model has been developed within the SBFEM framework. The model considers the cumulative crack opening/sliding measure to dominate the damage mechanism at the subcritical loading levels. The aim of this approach is to establish a link between cyclic damage rate and the efficiency of the SBFEM in modelling crack propagation. Comparing the thermodynamic softening law of the constitutive model for fracture, several aspects have been provided, which incorporate the loading-unloading path, the damage evolution during the load cycle, and the crack traction displacement behaviour. This model is developed to simulate the discrete crack propagation in SBFEM for both single and mixed crack modes. It introduces a model for efficient simulation of cyclic behaviour. In the process of this work, a general derivation of the SBFEM method is given to simulate the crack propagation of the studied domain. The constitutive law is inserted into the SBFEM framework as interface element at crack tip. The nonlinear consistent interface model is solved using displacement control algorithm to obtain the load displacement for both monotonic and cyclic loading scenarios. The cyclic damage accumulation during loading and unloading is formulated within the constitutive concrete model. Two common problems of the three-point bending of a single-edge-notched concrete beam have been studied to validate the developed method. Also, two mixed-mode crack propagation examples are modelled for monotonic and cyclic loading, with results discussed and compared with available data in publications. The simulation results showed good agreement compared to experimental test measurements from the literature. The study provides a numerical procedure of fatigue crack growth in concrete which can help to identify the primary governing mechanism of fatigue crack propagation in concrete. The numerical investigations focused on the effect of the loading sequence on the fatigue material life. The developed method is validated using experimental results of several examples subjected to different loading conditions. The method also applies to offshore foundations, dams and slabs of airport taxiway calculations. This work can be used as a tool for fatigue material assessment within a non-linear finite element framework. The complexity of the calculation makes the application of the method quite expensive. However, further improvement in computer science will overcome this disadvantage.
Download or read book Cyclic Loading of Concrete Structures written by Ian D. Bennetts and published by . This book was released on 1973 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stability and Ductility of Steel Structures under Cyclic Loading written by Yuhshi Fukumoto and published by CRC Press. This book was released on 1991-12-07 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: The U.S.-Japan Joint Seminar on Stability and Ductility of Steel Structures under Cyclic Loading was held in Osaka, Japan on July 1-3, 1991. This three-day seminar was devoted to five main topics: 1) materials properties and plasticity models, which featured experimental investigations of the material properties of structural steels and plasticity models of the material characteristics under dynamic and cyclic loading conditions; 2) experimental observations, which featured experimental studies of cyclic buckling behavior of steel structural members and frames subjected to dynamic and cyclic loading conditions; 3) analytical modeling, which discussed analytical modeling of the cyclic buckling behavior of steel structural members and frames; 4) design implementation, which emphasized earthquake engineering design of steel structures against cyclic buckling; and 5) future research needs, in which future analytical and experimental research needs on the behavior and design of steel structures subjected to dynamic and cyclic loading conditions were identified. This book contains 30 contributed papers presented at the seminar.
Download or read book Theory and Implementation of Plastic damage Model for Concrete Structures Under Cyclic and Dynamic Loading written by Jeeho Lee and published by . This book was released on 1996 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reinforced Concrete Structural Walls with Staggered Opening Configurations Under Reversed Cyclic Loading written by Aejaz Ali and published by . This book was released on 1990 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: buildings: (i) a generous use of structural walls in all buildings, and (ii) a staggered door opening configuration.
