جستجوی مقالات مرتبط با کلیدواژه « دیواربرشی فولادی » در نشریات گروه « عمران »

Steel shear wall is one of the most suitable common systems for the strength and stability of the structure against lateral loads. In this system, vertical boundary elements around the shear wall, in addition to being part of the lateral load-bearing system, are responsible for bearing the weight of the structure during and after the earthquake, and therefore in designing this system, the border elements are tried to be remained in the elastic state after complete yield of the web plate. Also, to provide uniform stress along the length and height of the wall, vertical and horizontal boundary elements must have high flexural stiffness. Code provisions in this case sometimes lead to the selection of non-economic sections in the beams and columns attached to the wall. In this study, in order to reduce the demand for vertical boundary elements attached to the wall and to make the design economical, vertical and inclined stiffeners are predicted inside the wall. These stiffeners direct the plastic deformations mainly into the wall and away from the columns. To evaluate and compare the behavior of the proposed model, 30 finite element models were studied under lateral monotonic and cyclic loading. The results show that the addition of stiffeners, in addition to increasing the stiffness and lateral resistance of the system, increases the ductility of the lateral bearing system and reduces the required flexural stiffness of horizontal boundary elements.

In this study, hysteresis behavior and energy absorption rate of steel shear walls in reinforced sheets CFRP, GFRP and the effect of grooves with different patterns under cycling have analyzed using the finite element method. For this purpose, the accuracy of the responses obtained from the software is compared with the experimental model. Sensitivity analysis is then performed on the dimensions and types of elements used in the analysis. All models are subjected to cyclic loading in according with ATC-24 code. After simulating each of the models in the ABACUS, the results of analysis include shear capacity, energy absorption and the maximum of these parameters were evaluated during the analysis of the models and compared with each other. The best model also in two parts of reinforcement and groove, under four different earthquakes, behavior seismic has been studied. The results show that the reinforced polymer sheets on the shear wall have a direct effect on the seismic performance and the pattern of stress distribution is directly related to how grooves. Also among the models, the use of CFRP with horizontal alignment has the best seismic performance.Key words: Steel shear wall, Reinforced polymer sheets, Energy absorption, Hysteresis curve, Performance improvement

During recent years, the occurrence of terrorist attacks and explosive events has increased the need to investigate the response of structures under blast loading. Due to the nature of blast loading, a lateral resisting system must damp energy to behave properly against blast loading. Steel plate shear wall system, which features a high level of stiffness, flexibility, and energy absorption, can be used as a means of the lateral resisting system against blast loading. In order to gain a better understanding of responses of the buildings and lateral resisting systems with different characteristics, the study of the behavior of the lateral resisting systems under blast loading conditions is essential. In order to achieve the aforementioned goal, 20 seismically designed steel frames with a number of stories of 3, 6, 9, 12, and 15 and different widths were modeled and analyzed under four explosive scenarios in OpenSees software (nonlinear dynamic analysis). The response of stories drift and acceleration, as well as the ductility ratio of the steel plate shear wall, were studied. The results of the study showed that tall buildings with steel plate shear wall system had behaviors far better than short buildings. The dominant behavioral modes of tall, medium height, and short buildings are flexural, combined shear and flexure, and shear modes, respectively. It is also observed that, in medium- and high-rise structures, the maximum horizontal acceleration of roof occurs in free vibration, while, in low-rise structures, this amount is experienced during loading. In addition, for all structures, the maximum horizontal displacement of the roof occurs in free vibration so that, with the increasing number of stories, this amount occurs later. In the other part of the study, it was shown that, in the same way, as we know for SDOF systems, in MDOF structures, the usual damping in systems with no control device is not significantly affected by the structure response to the explosion.

Despite many advantages of steel plate shear wall (SPSW) system, such as lightness, high stiffness, ductility, and fast implementation, this system is not as pervasive as other lateral load resisting systems such as bracing or reinforced concrete shear walls. To solve this problem, numerical parametric studies of system with consideration of seismic uncertainties which needs accurate non-linear models including behavioral deterioration of system is necessary. So, in this paper, besides studying existing macroscopic modeling of steel plate shear walls, a new model is introduced which is modified version of Strip model’s application with focusing on stress-strain curve proposed by one of researchers. After suggesting essential adjustments in this model and showing their necessities with emphasizing on experimental and finite element results, correctness of new model by doing several finite element analysis in different models with various plate thickness and length to height ratio is verified and proper values for parameters is proposed.