Papers by Keyword: Steel Frame

Abstract: Modern structures tend to be more and more complicated, setting up the complete calculation model and getting each part of the dynamic response is almost impossible and unnecessary. The substructure analysis technology is effective for the dynamic analysis of large and complex structure. The substructure theory has become increasingly mature and perfect, and has been widely used in structural analysis and calculation. This article simply introduces the principle of substructure pseudo dynamic test, and using the finite element software—ADINA simulates a steel frame.

Abstract: The present paper is conceived so as to give a general image of the problems concerning the passive response-control structures. An attempt to organize the different aspects of the passive control of seismic structural vibrations in a rational way is made. Choice of optimal bracing system was tested on 10-storey administrative building steel frame structure in nuclear power plants. Dynamic and strength characteristic classical bracing system in form V and X and system with TPEA devices are presented. Analytical stress-strain relation for refined plasticity model and stiffness matrix for TPEA devices are presented in good agreement with experimental results. The element COMBIN39 from ANSYS library using to nonlinear model is very effective. Bracing system with TPEA device show that the energy-dissipation capacity of the structure increases and then the seismic effects are maximal reduced using it.

Abstract: The ground motion is multidimensional, random and uncertain in directions when earthquakes occur, so dynamic response under oblique seismic action needs to be considered in the structure design. A frame structure with different stiffness in two horizontal directions was analyzed under seismic action with different input angles. The maximum response of beams and columns was obtained. The seismic mechanism of structures under oblique seismic action was discussed.

Abstract: This paper describes in detail a multi-objective optimization strategy and decision-making method in the process of steel frame optimization design. A step-by-step analysis process integrating optimization algorithm and model analysis is proposed to solve the present problem. A multi-objective algorithm method using fast Non-dominated Sorting Genetic Algorithm is employed to obtain the Pareto-optimal solution set through an evolutionary optimization process. A high-level multiple attribute decision-making method based on intuitionistic fuzzy set theory is adopted to rank these solutions from the best to worst, and to determine the best solution. An example is used to demonstrate the proposed optimization model and decision-making method.

Abstract: The dynamic response control for a three layer steel frame structure with shape memory alloy (SMA) cables under seismic ground motions was studied experimentally in the paper. A three-story steel frame structure model assembling the diagonal SMA cables was tested in a shaking table. The maximum acceleration and displacement of each layer of the steel frame structure were tested under two cases: assembling with SMA cables or not. The experimental result shows that the maximum acceleration and displacement of each layer are significantly reduced by assembling the SMA cables. The vibration responses of the steel frame structure had been greatly reduced by the great dissipation efficiency for SMA dampers.

Abstract: The semi-rigid steel frame-composite steel plate shear wall structure (SCSW) effectively improves the lateral stiffness of shear wall, making it possible to use the semi-rigid joint. In order to study the plastic failure mechanism of SCSW, a plastic model is established, in which the effects of the rotations of semi-rigid joints and yield deformations of infill steel walls on the energy consumption are considered. Based on that, a design method for the lateral ultimate strength is put forward and a nonlinear FEM model is setup using ANSYS. Through the comparison between plastic analysis results with the finite element results, it is shown that the plastic analysis method is feasible and has a safe redundancy.

Abstract: For a further study on the fire-resistant performance of steel plate shear wall under overall stage of fire, a numerical analysis model of steel frame filled with steel plate shear wall was built with the finite element software ANSYS. The stress and displacement distribution at different moments were calculated through the thermal structural coupling analysis acording to ISO-834 standard fire curve, by reasonable selection of the thermal parameters, which showed the highest temperature appeared on the heated side of the beam in the process of heating up, while the highest temperature in the stages of cooling and natural cooling appeared in the column-beam connection; The temperature of structure was elevated for 11minutes, then dropped for 64.5minutes and finally the structure was cooled in the air for 60.5minutes. The whole process shows that the lateral load-bearing capacity of the steel frame filled with steel plate shear wall was reduced by about 30 percent, compared to room temperature.

Abstract: This paper uses the SAP2000 to establish different beam column connections of steel frame structure finite element model, comparative analysis of the beam column for the rigid connection, hinged, semi-rigid connections of steel frame structure, the dynamic characteristics of structure displacement and internal force influence. At the same time, the dynamic time-history analysis method for structural displacement supplementary checking, analysis of structural response to seismic wave degree．The results showed that：compared with rigid, the structure of semi-rigid connections to the larger natural period，and with the rotation stiffness decreases vibration period increases; Semi-rigid steel frame connection to reduce the resistance to push the layer stiffness，making the structure of the horizontal displacement increased．

Abstract: The substructure of Weinan Hongji building in Shanxi Province is frame shear wall structure, supporting a cantilevered steel roof in the shape of an “official hat”. Two different design proposals were compared between pipe truss structure and steel frame. Space truss system was adopted in the middle large span part. Spatial analysis of the overall model was carried out using Midas730 software and 51types of load combinations were considered. The period, mode, strength and stiffness are compared and the result shows that the option 1 outperforms option 2.

Abstract: In order to improve the capacity of resistance to progressive collapse for steel frame structures, a new measure, which uses bracing systems to help damaged frame to bridge across the local damage caused by abnormal loads, is presented in this study. The dynamic progressive collapse analysis is carried out to investigate the effect of resistance to progressive collapse in two different cases of column removal. Analytical results show that bracing systems on the top of steel frame structure have obvious effects on collapse prevention. Comparison with the unbraced steel frame structure, fixing bracing system could decrease the vertical displacement of the node corresponding to the top of the removed columns, and reduce the moment peak value at the end section of beams. And after column removal, plastic hinges come into being in the unbraced steel frame, on the other hand, there are no plastic hinges formed in the steel frame with bracing system.