پژوهشگاه بین المللی زلزله شناسی و مهندسی زلزله فصلنامه علوم و مهندسی زلزله 2476-6097 5 4 2018 12 22 Study of Fuses Used in Steel Repairable Buildings with Seesaw Motion مطالعه‌ای بر مشخصات فیوزهای پیرامونی استفاده شده در ساختمان‌های تعمیرپذیر فلزی با حرکت الاکلنگی 99 113 240373 FA حسین کاظمی‌فرد گروه مهندسی سازه، دانشگاه آزاد اسلامی واحد علوم و تحقیقات، تهران، ایران محمود حسینی پژوهشکده مهندسی سازه، پژوهشگاه بین‌المللی زلزله‌شناسی و مهندسی زلزله، تهران، ایران 0000-0003-3142-4087 مسعود نکویی گروه مهندسی سازه، دانشگاه آزاد اسلامی واحد علوم و تحقیقات، تهران، ایران بهرخ حسینی هاشمی پژوهشکده مهندسی سازه، پژوهشگاه بین‌المللی زلزله‌شناسی و مهندسی زلزله، تهران، ایران Journal Article 2018 09 02 Preventing the collapse of buildings during major earthquakes by using the capacity of plastic deformations of their structural members is regarded as the main philosophy behind most of the present seismic design codes. However, regarding large, especially near-source earthquakes, the amount of these plastic deformations may be so large that the building may lose its performance, and its demolishing may become inevitable. As a result, some adverse consequences are imposed to the stricken community. First, it is necessary to evacuate and shelter thousands, even hundreds of thousands of people who have lost their living or working spaces. Second, demolishing the severely damaged (but not collapsed) buildings is a very difficult and time consuming task since the considered ductility in design may not result in losing their integrity easily, and the common demolishing techniques may not be used for those buildings. Third, the debris removal of the demolished buildings, whose weight may be over millions of tons in case of large cities is very time consuming and costly. Finally, plenty of time and cost as well as a large number of skilled work forces are needed to construct the new buildings to replace the demolished ones. <br />Based on the above-mentioned issues, it is recommended to design and construct the buildings in such a way that they can be easily and quickly repaired with little cost, even after major earthquakes. Buildings that are created in this way can be called repairable or resilient buildings. Employing a structural system with seesaw motion is considered as one of the ways for creating earthquake-resilient buildings. In seesaw buildings, all circumferential columns at the lowest story are equipped with energy dissipating devices or structural fuses, all internal columns at that story are omitted, and a central mega hinge support with a grid of orthogonal strong girders are used to keep the integrity of the upper stories and transfer their gravity loads to the mega hinge support and the circumferential columns at the lowest story. In this research, the specifications of a kind of yielding-plates structural fuse, namely the initial stiffness and the yielding displacement, have been investigated and its application in a set of buildings with seesaw structural systems has been studied subjected to near-source earthquakes by performing a series of nonlinear time history analyses (NLTHA) using the scaled accelerograms of a set of selected earthquakes. Results of the conducted NLTHA indicate that the IO seismic performance level is mostly achieved in seesaw buildings by using the appropriate values for the aforementioned behavioral parameters of the structural fuses, while the conventional buildings with the same geometry mostly fail subjected to the same applied earthquakes. The maximum absolute acceleration of the buildings’ roofs and their base shear are significantly reduced by using the seesaw system; however, the roofs maximum displacements in some seesaw buildings are increased comparing to the conventional buildings, but they are still in the range of seismic design code limitations. از فیوزهای سازه­ای و سیستم الاکلنگی جهت کاهش پاسخ ساختمان در مقابل زلزله و هدایت آسیب استفاده می­شود. در این سیستم ستون‌های ساختمان حذف شده و به‌جای آنها در مرکز از یک تکیه­گاه و در پیرامون ساختمان از فیوزهای سازه­ای غیرخطی استفاده می­شود. هدف اصلی از ایجاد این سیستم این است که هنگام زلزله اجزای سازه­ای به‌صورت الاستیک باقی مانده و تغییر شکل‌های غیرخطی در فیوز­های سازه­ای پیرامونی به وجود ­­آید که پس از زلزله می­توان در مدت‌زمان کوتاه و با هزینه کمتری نسبت به هزینه ساخت کل ساختمان، فیوزهای آسیب‌دیده را تعویض و از ساختمان بهره­برداری نمود. در این تحقیق مشخصات نوعی از فیوز سازه­ای مورد بررسی قرار گرفته و کاربرد آن در ساختمان با سیستم الاکلنگی تحت اثر زلزله حوزه نزدیک مورد مطالعه قرار می­گیرد. به‌طوری‌که حداکثر شتاب مطلق بام و برش پایه به‌طور چشمگیری کاهش می­یابد، اما میزان تغییر مکان جانبی نسبی طبقات در برخی از ساختمان‌ها افزایش یافته اما از حد مجاز کمتر است. https://www.bese.ir/article_240373_e9e0f92f9ec3b003f6829fbe4e15ff18.pdf