Papers by Keyword: Fiber Model

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Authors: Pu Yang, Jing Tang
Abstract: Using flexibility-based finite element method based on fiber model, several experiments of reinforced concrete specially shaped columns under cyclic loading which cross section is ‘L’, ‘T’ and ‘+’ shape with different longitudinal reinforcement and hoop reinforcement have been simulated, and the seismic behavior of columns such as strength, ductility and energy dissipation are analyzed. Results from the analytical study indicate that: 1) ductility of the column increases as quantity of hoop reinforcement increases. 2) strength capacity of the column increase linearly as ratio of longitudinal reinforcement increase, but is not seriously affected by hoop reinforcement; 3) energy dissipation capacity of the column is not significantly affected by hoop and longitudinal reinforcement, particularly in slightly nonlinear range.
Authors: Chuan Qing Liu, Zuo Yun Mei
Abstract: In order to investigate the resistance mechanism of steel frame structure in progressive collapse, an advanced finite element model(FEM) is presented based on fiber beam-column element. Using this FEM, non-linear static pushdown analysis of a ten-story structure was carried out by the alternate load path method, in the two cases that two different columns are removed respectively. Analytical results show that residual structure has the different resistance mechanism for the different column removal case. In the initial stage, bending resistance mechanism can provide dominate resistance capacity in the structural progressive collapse, after both middle and side columns are removed. However, when the bending resistance is out of work, the catenary action is induced in the case of the middle column removal only, which is not developed after the side column is removed. It can be seen that steel frame structure has higher collapse risk in the case of the side column removal than in the case of the middle column removal.
Authors: Hong Tao Yang, Rui Li, Zhi Qiang Chen, Zhang Yue
Abstract: Hollow thin-walled high pier is a common form of high pier in mountainarea, so it is of practical significance to the dynamic stability analysis ofhollow thin-walled high pier in mountain area. This paper is taking themountainous area of a hollow thin-walled high pier as the background, and theestablishment of the fiber model with Midas for dynamic elastic-plastic timehistory analysis. The results show that: the hollow thin-walled high pier underthe impact load, load amplitude is lower than the critical load,and the dynamic response characteristics of thestructure of the value parameter i.e. horizontal displacement at pier top increaseslinearly with the load amplitude. When the load amplitude is larger than thecritical load, the horizontal displacement of pier top increases with theincrease of load amplitude nonlinearly. Power under dynamic load instabilitycritical load is about 80% under static load.
Authors: Feng Miao, Lei Shi, Zhe Zhang
Abstract: Base on the elastic-plastic analytical theory, an elastic-plastic time-history analysis of self-anchored cable-stayed suspension bridge, which engineering background is Dalian Gulf Cross-sea Bridge program, is performed by using general finite element software Midas/Civil. The material nonlinearity of structure is considered with reinforcement concrete fiber model, and distributed hinge type is adopted to simulate for plastic hinge. Compared with the results of an elastic time-history analysis, it is shown that for the structure into the elastic-plastic stage, because of the production of plastic hinge, the input seismic energy is dissipated partially, and the internal forces of structural elements are reduced. The bending moments and axial forces occur mainly in the main tower root. Furthermore, the rotation properties of the plastic hinge causes displacement increasing of certain parts of the structure, which assumes mainly the vertical displacement present on the top of main tower and the main beam. In conclusion, it is proposed that caging devices are set in the design.
Authors: Xue Long Shen, Ying Zhao, Zhe Lin
Abstract: In order to get the performance of a super high-risebuilding under severe earthquake actions, a fiber-based computational model ofthis structure is established in PERFORM-3D, and both Static Elastoplastic Analysis and Elastoplastic Time-history Analysis are used to evaluate theseismic behavior of this structure. Inter-story drifts at the Performance Point obtained by Static Push-over Analysis are allsmaller than that specified in codes. And results of Elastoplastic Time-historyAnalysis show that structural displacements, shear capacity and flexuralcapacity of some key members all meet the specified performance targets. Thenthis structure is safe.
Authors: Min Xia, Jiang Tao Yu, Zhou Dao Lu, Li Wen Zhang
Abstract: In order to analyze the residual mechanical properties of concrete frame structures after fire, a novel numerical model considering the distribution of non-uniform temperature in the cross-sections of structural members and the changing of mechanical properties of materials damaged by fire is developed in this paper by dividing the cross-sections of structural members into a lot of concrete fibers and steel fibers based on the concept of fiber model. Besides, the Analytical System of Fire-damaged Concrete Frame (ASFCF) is established through the secondary development of ABAQUS Software that is completed by the programming language of Python. This system is used to analyze the temperature fields and the nonlinear mechanical performances of a multi-story, multi-span, three-dimensional concrete frame after fire. The results indicate that ASFCF can properly analyze the mechanical properties of concrete frames after fire, and it provides valuable references for assessing the residual mechanical properties of concrete frames after fire.
Authors: Shi Ang Zhang, Zuo Zhou Zhao, Xiao Gang He
Abstract: A nonlinear analysis program based on fiber model was developed and used in analyzing the flexural behavior of steel reinforced concrete (SRC) columns under axial and bilateral loading. Concrete different confinement levels for different zones in a SRC column section, such as cover concrete zone, stirrup confined concrete zone and steel confined concrete zone, etc., can be considered. Some SRC tested specimens were simulated using the developed program. It was pointed out that the flexural capacity will be lower-estimated if the concrete confinement was neglected.
Authors: Yan Qun Zhou, Mei Xin Ye, Zhi Shuo Yang, Li Ou
Abstract: The seismic performance of reinforced concrete(RC) columns is one of the controlling factors of the shock resistance for RC frame structures and bridges under seismic loads. Due to the complicated material behavior and complex external force during the earthquake, an accurate simulation of the mechanical performance under seismic loads demands more precisions for the hysteresis constitutive laws of materials. In this paper, based on the fiber cross-section model, adopting revised Kent-Park model for concrete and Legeron model for steel reinforcement, programming the UMAT material subroutine, FEM software ABAQUS is used to simulate a RC column mentioned in a research. It’s results are found agreed well with the test results.
Authors: Peng Tao Yu, Jing Jiang Sun
Abstract: Under the excitation of large earthquake, structures enter into high nonlinear stage. Currently, Opensees, Perform-3d and Canny are used as the most popular nonlinear analysis procedures. The fiber model will be introduced firstly and the nonlinear analysis models in Canny are explained in detail. Then Canny2007 is used to conduct nonlinear time history analysis on a heavily damaged frame structure with interlayer in Dujiangyan during Wenchuan Earthquake. Analysis shows that the maximum inter-story drift appears between the interlayer and its upper layer, and the heavy damage agrees well with the results of damage investigation. By comparing the damage extent of frame structures with or without interlayer, it reveals that the seismic performance of RC frame structures without interlayer is obviously better than that of ones with interlayer.
Authors: Tao Wang, Jing Jiang Sun, Li Yan Meng
Abstract: In this paper, to verify the effectiveness and reliability of nonlinear numerical simulation based fiber model, two computer programs (CANNY 99 and IDARC-2D), in which shear wall elements were respectively simplified by fiber model and equivalent beam model, were adopted to perform the numerical simulations of 10 times shaking table tests of a nine story 1:6 scale frame-shear wall building model in this paper. Analysis model including beam, column and wall element in CANNY 99 is elaborated in detail. Test results are compared with simulation results in some aspects such as natural frequency, time history responses, and peak value responses. Results demonstrate that fiber model and Equivalent beam model can simulate the elastic-plastic earthquake response of R.C. wall structures very well.
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