mohammad reza shokrzadeh

Lightweight steel structures (LSFs), which are manufactured dry and manufactured using industrial production and cold rolling (CFS). For carrying the side loads in cold-rolled structures, belt braces or shear walls are used. . Considering that the weight of the materials, the preparation and implementation of the wall is a limiting factor for its use in the repair of the frames. Determining the proper makeup that reduces the use of wall panels can be a significant factor in improving the performance of the frames in improving and framing the frames. The sample of the laboratory chosen to examine the performance of the LSF lightweight steel frame system and the accuracy of the modeling in the ABAQUS software includes a LSF light steel frame system, tested by Bin Liu et al. (2016). For this purpose, the frame reinforced samples were categorized in three general categories, including a non-reinforced sample, a braided braid, a double-row braid, and a 45-degree reinforced sample under a monotonic loading, comparing the results obtained from the sample analysis With non-reinforced specimens, it was found that the bearing capacity of the reinforced frame with double-row double-row multi-row bricks was close to the full 45-degree frame. Use of higher yielding steel increased the static strength and earth-impact resistance of the bracing, but the ability The energy absorption reduces it. Use of 45 ° steel sheets adds an extra Its shape is framed.

Different methods may be used for strengthening weak concrete connections.Because of the unique characteristics of FRP composites, they are widely used for strengthening concrete moment resisting frames. These retrofitting techniques are widely considered in research and practical applications. The retrofitting cost is an important factor in the selection of the most suitable retrofitting techniques. In the application of FRP laminates, the cost of retrofitting is mainly the function of FRP volume and the surface preparation. In this research, using ABAQUSgeneral purpose finite element software, the effect of different FRP configuration in X-shape connection strengthening scheme were considered and the results were compared with full FRP coverage of connection. In this strengthening scheme, the effect of parameters such as strip width and thickness was examined. The results showed that in strengthening with x-shape strips, the connection could develop the capacity of connection strengthened by full FRP coverage, while it needs about 16 percent less FRP laminates, which meaningfully could reduce the price of connection strengthening.