چكيده به لاتين
To validate the dissertation, we first compare a 3D structure by considering the gravitational frame in modeling OPENSEES. After verifying the results of a case study on a steel building with a lateral bearing system in both directions of the bending frame and gravity joints, we perform. The study is that in some openings where there is a brace, we remove the braces and replace them with rigid connections, and keep the rest of the connections by weight.
Now we model and analyze the structure in several ways. The first case, regardless of the gravity frame (A) and the second, third and fourth cases of gravity joints in the analysis with a connection difficulty of 20, 50 and 70% (D, C, B) are included. Then, by comparing the results obtained in four cases, we examine what effect the consideration of the weight frame has on the maximum drift rate, the overlay curve and the dynamic analysis, and whether the consideration of the weight frame is useful for our design or not?
The results show that according to the current condition of the existing structure and the results obtained in this study, the possibility of removing the braces and catching the joints as a method to change the performance can not be seriously considered. In addition to low stiffness, the existing structure does not have sufficient strength, and in DBE hazard level displacements, the median values of the analyzes indicate that it is several times higher than the allowable limit of this code, which is between 2-2.5. These results are much more pronounced at the MCE risk level and cannot be ignored. In addition, various researchers have shown that if the waste drift in a building after an earthquake is more than 0.5%, because it is uneconomical to repair, it is preferable to build a new building rather than repair the damaged building. As a result, waste drift control in this structure is very different from the introduced limits.
