Abstract
Abstract Structural fuses and rocking system are used in order to reduce the building response to earthquakes and damage guidance. In the proposed seesaw motion system, which is similar to the rocking system, the building columns, in top of the foundation, have been removed and a central support and structural fuses are used around the building instead of them. The main purpose of creating this system is that the structural components remain elastic during the earthquake and nonlinear deformations occur in circumferential structural fuses it means that, it is possible to replace damaged fuses after the earthquake and exploit the building in a short time and at a lower cost than the construction cost of the whole building. In this research, the specification of a kind of structural fuse have been investigated and its application in the building with a seesaw system is studied under the influence of the near-field earthquake. After reviewing the fuses, it was observed that, the maximum absolute acceleration of roof and the base shear are significantly reduced in this system; however, the relative drift of floors in some buildings has increased but is lower than the permitted limit.
Highlights
The purpose of the current seismic design codes in designing and performing buildings against ground motions in earthquakes is to dissipate the seismic energy through their non-elastic behavior
The length of the plate is shown by (h). This length is determined based on the dimensions of the fuse and the distance between the external shell and the central core, and in addition to, the length is appropriate for large deformations of the plate and the triangular plate is not removed of the central core opening, the length of the plate has a direct effect on the hardening region of the plate
3. the grid of orthogonal strong girders (GOSG): Due to the fact that the middle columns of the first floor are removed in order to transfer the load of the columns of the upper floors to the central support and, the circumferential columns are replaced with structural fuses, the major part of the load of these columns should be transferred to the central core, it requires a relatively rigid support for the columns that, GOSG can be consisted of strong beams or trusses
Summary
The purpose of the current seismic design codes in designing and performing buildings against ground motions in earthquakes is to dissipate the seismic energy through their non-elastic behavior. 'Deliberate Directing of Damage' (Hosseini and Alyasin 1996) or its updated version 'Directed-Damage Design' (DDD) (Hosseini and Ebrahimi 2015) is considered as an appropriate way for creating the desired repairable buildings and DDD method are used in this research Based on this approach, a condition should be created to direct and guide the damage to some pre-decided and specific parts (structural fuses) related to the building structure to keep its main members such as columns, beams, and bracing elements intact. A condition should be created to direct and guide the damage to some pre-decided and specific parts (structural fuses) related to the building structure to keep its main members such as columns, beams, and bracing elements intact In this way, a quick and easy repair of the building structure with little cost is possible even after a major earthquake. The characteristics of the SFs and the seismic performance of 3, 5, 7-story steel buildings are investigated regarding of seesaw motion
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