عنوان مقاله :
بررسي رفتار لرزه يي مهاربندهاي كمانش تاب با غلاف فولادي بدون مواد پركننده
عنوان به زبان ديگر :
SEISMIC BEHAVIOR OF BUCKLING RESTRAINED BRACES WITH STEEL TUBE WITHOUT MORTAR FILLER
پديد آورندگان :
رضواني شريف، مصطفي دانشگاه صنعتي خواجه نصيرالدين طوسي - دانشكده ي مهندسي عمران , غفاري، سارا دانشگاه آزاد اسلامي واحد خمين - دانشكده ي مهندسي عمران
كليدواژه :
مهاربند كمانش تاب , غلاف فولادي , اتلاف انرژي , نرم‌افزار آباكوس , بارگذاري دوره‌يي
چكيده فارسي :
يكي از سيستم‌هاي پايداركننده‌ي سازه‌ها در برابر بارهاي جانبي، مهاربندهاي كمانش تاب است؛ كه در آن‌ها با تسليم عضو مورب تحت اثر كشش يا فشار، ظرفيت اتلاف انرژي قابل ملاحظه‌يي فراهم مي‌شود. در پژوهش حاضر، 11 مهاربند كمانش تاب و يك مهاربند معمولي در نرم‌افزار آباكوس مدل‌سازي شده است. رفتار مدل‌هاي مهاربند كمانش تاب تحت تأثير وجود غلاف فولادي، عدم استفاده از ملات پُركننده، شكل مقطع هسته‌ي اعضاء مورب و ضخامت غلاف فولادي تحت اثر بارگذاري دوره‌يي يكسان بررسي شد و نتايج تحليل نشان داد كه ظرفيت اتلاف انرژي در مهاربند كمانش تاب حدود 5 برابر ظرفيت اتلاف انرژي مهاربند معمولي است. قابليت اتلاف انرژي و ظرفيت نهايي مقطع عضو مورب در حالت بدون مواد پُركننده در مقايسه با ظرفيت مقطع در صورت استفاده از مواد پُركننده كاهش مي‌يابد و هسته‌ي اعضاء مورب مهاربند با سطح مقطع دايره نسبت به دو سطح مقطع ضربدري و ناوداني مقاومت بيشتري دارد.
چكيده لاتين :
One of the methods for stability of structures under seismic loads is the use of steel braces. One of the bracing systems with appropriate performance is Buckling Restrained Braces (BRBs.). This kind of braces does not have weakness such as the conventional concentrated braces under cyclic loading and provides significant capacity of energy dissipation with members restrained from buckling and has symmetrical and stable hysteresis curves. This system serves as replaceable structural fuses, minimizing the amount of damage to the other members. These studies have been conducted to the restrained buckling braces systems. Most of the cases have been surrounded by the concrete or mortar and the metal sheath. Since the construction of the
bracing surrounded with filler material has difficulties, it was necessary to study another type of braces on wich few studies have been conducted. In this research, 11 models of BRB have been studied. selected for the investigation of Buckling Restrained bracing members, including flat plates, cross, double, and circular studs which are without filler, have been surrounded by metal sheath in ABAQUS software. Modeling parameters and lack of enforcement of mortar filler, shape of the core,thickness of sheath are specified by examining the ratio of buckling load of sheath (Pe) to yield load of core (Py) under cyclic loading. The results have shown that the capacity of energy dissipation of BRB is about 12 times more than the capacity of conventional concentrated braces. The increase of tolerance has been brought about by increasing the ability of the energy dissipation. In addition energy dissipation capability and the maximum capacity of section in the state without filler materials decrease, and the core of circular section is more resistant than the cross and studs sections. Energy dissipation capacity with circular cross-section is
compared with the channel and cross section. By increasing the tolerance limit, load model has decreased; however, energy dissipation capability has increased.
عنوان نشريه :
مهندسي عمران شريف
عنوان نشريه :
مهندسي عمران شريف
