تاثير ارتفاع در توزيع انرژي در ساختمان‌هاي فولادي بهسازي‌شده با ميراگرهاي ويسكوز مايع در اثر ضربه

Improvements in the Energy Distribution of Steel Buildings using Fluid Viscous Dampers

هدف از اين پژوهش ارزيابي تاثير ارتفاع در توزيع انرژي در ساختمان‌هاي فولادي بهسازي‌شده با ميراگرهاي ويسكوز مايع در اثر ضربه است. بدين منظور 3 مدل زوج‌قاب‌هاي دو بُعدي 6 ، 8، و 12 طبقه‌ي 3 و 4 دهانه، مطابق آيين‌نامه‌ي 2800 ايران (ويرايش سوم) طراحي و در نصف فاصله‌ي مجاز آيين‌نامه‌ي استاندارد 2800 ايران (01/0 ارتفاع ساختمان كوتاه‌تر) در كنار يكديگر قرار داده شده و در حالت با و بدون ميراگر در مقابل 7 زوج شتاب‌نگاشت با نرم‌افزار Perform-3D تحليل ديناميكي غيرخطي شده و انرژي اعضا اصلي سازه استخراج و بررسي شده است. با بررسي اثر ضربه‌ي اين نتيجه حاصل شده است كه با توجه به زيادشدن ارتفاع و تشديد ضربه بين زوج‌قاب‌ها، بيشترين ميزان اتلاف انرژي در سازه‌هاي بلندتر است و با قراردادن ميراگر، بيشترين اتلاف انرژي به‌وسيله‌ي ميراگر ويسكوز در سازه‌ي 12 طبقه صورت گرفته است. وجود ميراگر ويسكوز در ميان‌قاب‌ها همواره موجب كاهش چشم‌گير اثر ضربه و ميزان انرژي اتلاف‌شده‌ي خميري در المان‌هاي اصلي سازه شده است.

Buildings adjacent to each other may create risks during earthquakes, due to catastrophic structural response. This phenomenon is referred to as the impact of non coherent vibration of adjacent buildings that are not constructed far enough apart. Considering that Iran is located on an active seismic belt, and with due regard to the need for safety, due to the expansion of towns and villages as well as retrofit buildings, it is obvious that research is needed regarding the risks of injury during seismic hazard. The simplest way to cope with this phenomenon is to construct buildings of sufficient distance from each other. However, this is not always applicable, and other means are required to reduce the impact of this phenomenon. One of the most modern methods of applying seismic dampers is necessary resistance against lateral forces using energy applied to the amortized and maintaining structures, known as energy dampers. Fluid viscous dampers are passive energy dissipation systems for seismic rehabilitation of old buildings. These dampers are uniform at all levels with the same scrollable frame placed between them. According to energy intake, the damper at each floor number was optimized and linear spring elements were used to model the impact of the gap. For analysis of nonlinear dynamical performance, 3D software was used and the main structural elements were made of plastic. This study showed that the performance within the frames of the viscous damper significantly reduced the impact energy dissipation rate, and the distance between the impact energy absorption. For a viscous fluid damper, the amounts of energy absorbed by the damper at all distances are almost identical.