Abstract
Given the importance of structure strengthening, this research introduces a particular type of steel structure in which the reduced beam section and post-tensioned cables were used for creating centralized property and preventing the formation of plastic hinges in the beam and columns. After introducing the system, ABAQUS modeling results are compared with a reliable laboratory sample to check its accuracy. Good convergence was seen which shows the modeling accuracy. The results of the model’s nonlinear static analysis revealed that the above steel structure has higher ductility when compared to conventional steel structures. Also, the results showed that with the rising of height, span length and early post-tensioned power of the cables we can increase the ductility of the structure.
Highlights
The importance of designing resistant structures against the lateral forces is a crucial matter in Iran
The radial cutting connection was proposed [1].The results of the comparison experiments of steel moment frames to conventional bending and reduced section show that the moment frames with reduced beam section (RBS) connections are better than conventional bending frames
What this study seeks, is evaluating nonlinear behavior of steel structures in which, the type of connection being used is a combination of reduced beam section and post-tensioned cables
Summary
The importance of designing resistant structures against the lateral forces is a crucial matter in Iran. In the centralist structures, the significant non-elastic deformations and residual drift in beams and columns can be deleted by the opening of the connection distance It seems that the centralist structures can, without damage to the main structural members, return to their original position after the earthquake. Unlike the conventional steel frames which are based on the ductility and endurance of structural materials, ductility behavior of the centralist structures is constant because of the behavior of posttensioned cables or high quality fittings In these connections before the cyclic loading, the strong cables or fittings become post-tensioned. What this study seeks, is evaluating nonlinear behavior of steel structures in which, the type of connection being used is a combination of reduced beam section and post-tensioned cables. It should be said that the beams and columns are not directly connected to each other and there is 2 cm distance by the column flange hardener [9]
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