جستجوی مقالات مرتبط با کلیدواژه « دیوار برشی فولادی موج دار » در نشریات گروه « عمران »

Steel plate shear wall is a lateral force resisting system, of two types of stiffened and unstiffened. The manufacturing of the stiffened type is time-consuming, costly, and needs more supervision; because of many executive details. Steel plate shear wall with a corrugated web is a new system that has been considered as an alternative for all types of stiffened walls. Corrugated sheets have complex geometry and their modeling is difficult in existing conventional software. To overcome the complexity of the modeling of corrugated sheets, flat sheets with orthotropic material properties can be replaced instead of these sheets by the help of material mechanics science. This research aims to provide a specific process for calculating the mechanical properties of an alternative orthotropic flat sheet to the corrugated sheet, and to study the accuracy of the orthotropic model in predicting the monotonic and cyclic behavior of corrugated shear walls. For this purpose, the results of the analyses of the orthotropic and trapezoidal corrugated models of the steel plate shear wall with different characteristics of the waves are compared and the accuracy of the proposed method is examined. Finally, by studying the results of different models in Abacus, it was found that the proposed method was able to predict the monotonic and cyclic behavior of trapezoidal corrugated steel shear wall.

In this paper, seismic behavior of corrugated steel shear walls arranged in different configurations is studied using fragility curves. Due to the advantages of steel shear walls, the use of this system has been of interest to the executives and designers and its use as a lateral resisting system in practical projects is rapidly expanding. Therefore, consideration of the unknown aspects of this system is important. In the present study, the effect of configuration of corrugated steel shear wall with cold rolled steel in structures with 3, 5 and 7 stories have been investigated. The number of bays in the direction of the shear wall is five, in the first type arrangement, the walls were in the first and the end of the bays, in the second type arrangement of the walls in the middle bays and in the third type arrangement, in the two spans of the first and the end they are staggered. For modelling the behavior of corrugated steel shear walls, previous experimental results have been used. Using static nonlinear analysis and increasing dynamic analysis, Fragility curves, which play an important role in assessing the seismic damage of buildings, are presented for these frames. The results of this study show that in type 2 layouts, the median intensity is higher than the two other arrangements in the structures with different stories. In addition, the corrugated shear walls in low-rise structures are more effective in decreasing the probability of failure subjected to far field earthquakes

In recent years, several systems have been considered as lateral load systems in buildings. Corrugated steel shear walls are one of these systems which are widely used in buildings for seismic areas. The main advantage of steel shear walls is their ductility and high strength. By making changes in the geometry of the steel shear walls, such as corrugating them, their strength and ductility can be increased. However, sometimes due to reasons such as architectural conditions, executive issues, or wall hardness reduction, they have openings. Due to physical and geometrical nonlinear behavior, the structural behavior of the corrugated steel shear walls with opening is complex. In this paper, by using finite element method on the ABAQUS software, which its results are validated by comparing with experimental results extracted from literature, a wide study on the effect of the shape and location of the opening on the performance of the corrugated shear walls is carried on. The behavior coefficient (R) obtained by applying a non-linear Push-Over is a criterion for comparing the structural behavior of the study samples. The results showed that the presence of openings in the corners of the corrugated steel shear wall would increase the behavior coefficient up to 7.2, and In this situation, the shape of the opening does not affect the amount of the behavior coefficient. If the opening position is in the vicinity of the boundary element of the frame, a more elasticity factor will be created in the case of circular openings in the vicinity of the beams, and square openings in the vicinity of the columns.

Steel shear wall is considered as an effective seismic system due to having various characteristic such as loading capacity, high level of stiffness, ductility and higher level of energy absorption. Most studies focusing on the steel shear walls mainly investigated of stiffened or unstiffened flat steel sheets or corrugated steel sheets. Specific shape and outer stiffness on top of the corrugated steel sheets will create a flat, unstiffened steel shear wall relatively enhancing the limitations of stiffened steel shear walls. It should be mentioned that corrugated steel walls can significantly increase the structures' stiffness. However they exhibit weaker performance regarding sustainability of seismic behavior, ultimate strength and energy dissipation capacity compared to the unstiffened steel shear walls.In this study, steel shear walls consisting of flat and corrugated steel sheets (SSW\_C\_FCS) are proposed to improve the performance of the earthquake resistant system. Therefore, considering the frame dimensions and thickness of steel sheets, the seismic performance of unstiffened and corrugated steel shear walls along with the newly proposed steel shear wall consisting of flat and corrugated sheets with horizontal and vertical waves are compared.The specimen' modeling was implemented for a frame containing 3 stories and 1 span considering a real scale under gravity and seismicity loading. The ratio of span's length to the story's height was selected as L/h=0/5 , L/h=1 , L/h=1/5 while three different thickness values (1/5,3 and 4/5mm) were chosen for the steel sheet. As for each specimen, all parts of shear walls were separately designed and controlled by international regulations before conducting numerical evaluations to provide ductility conditions considering the importance of steel shear wall as a ductile system.The results of limited component analysis indicated that the proposed shear wall consisting of both flat and corrugated sheets showed proper sustainability under loading and significantly improved the seismic performance of unstiffen and corrugated flat walls.

Steel shear walls has been noticed against wind and earthquake lateral loads about high buildings in the last three decades. This modern phenomenon is growing rapidly worldwide so that system have been employed highly in construction of new buildings and seismic upgrading of existing buildings in some countries such as USA and JAPAN. That is a very simple system from viewpoint of implementing and there isn’t particular complexity. High strength and ductility are main advantages of these systems. Current paper has investigated comparatively behavior of steel shear walls made of smooth and corrugated sheets. Also the paper has assessed push-over curves and cyclic binding. According to this result of the research, corrugated steel shear walls have lower ductility than smooth shear walls. The research also founded that despite the high strength of corrugated sheets in low displacement, behavior of flat shear walls is more stable than corrugated shear walls. On the other hand flat steel shear walls attract energy more than corrugated shear walls. Therefore using of flat shear walls is recommended in high seismic regions. In this research, 18 samples of flat steel shear walls and corrugated shear walls were modulated. In all models, panels height were 3 m and panels span were 3, 4 and 5 m. the thickness of sheets in the samples were 3, 4 and 5mm. According to results of the research: 1- Corrugated sheets are unstable and unpredictable in high thinness. In the low displacements occurs a mutation state, so it distinguishes the corrugated and flat shear walls behavior. 2- At low displacement, a corrugated sheet bears greater load than a flat sheet. 3- In a constant thickness for thinner corrugated sheets is increased the mutation rate and its behavior becomes more non-uniform. 4- Despite of the fact, pynchyng phenomenon appears in all samples, but all samples behavior is stable and significant energy attraction is observed.