پديد آورندگان :
شابدين ، مجتبي نويسنده Shabdin, M , سلطاني محمدي، مسعود نويسنده دانشكده فني و مهندسي-دانشگاه تربيت مدرس soltani mohammadi, masoud
كليدواژه :
طراحي مستقيم براساس تغييرمكان , ديوار برشي بتن مسلح , طراحي براساس تغييرمكان , طرح لرزهيي
چكيده فارسي :
هدف از اين تحقيق ارزيابي روش طراحي مستقيم براساس تغييرمكان در طراحي لرزهيي ديوارهاي برشي بتن مسلح است. براي اين‌منظور 4 ديوار برشي بتن مسلح طره با تعداد طبقات 4، 8، 12، و 16 با استفاده از روش طراحي مستقيم براساس تغييرمكان براي محدوده‌ي تغييرمكان نسبي مشخص، طراحي و مورد تحليل‌هاي تاريخچه‌ي زماني غيرخطي IDA قرار گرفتند و نتايج حاصل از اين تحليل‌ها با فرضيات طراحي مقايسه شدند. نتايج تحليل حاكي از آن است كه روش طراحي مستقيم براساس تغييرمكان بر مبناي پيشنهادات پريسلي منجر به پيش‌بيني مناسب تغييرمكان‌ها نشده است و تغييرمكان‌هاي پيش‌بيني‌شده با اين روش اغلب اختلاف قابل‌توجهي با نتايج تحليل‌هاي تاريخچه‌ي زماني دارد. با توجه به بررسي‌هاي صورت‌گرفته، علت اين اختلاف بررسي و پيشنهاد‌هاي اصلاحي ارايه شده است. مدل‌سازي و انجام تحليل‌هاي تاريخچه‌ي زماني با استفاده از نرم‌افزار اجزا محدود OpenSees انجام شده است.
چكيده لاتين :
The purpose of this study is to evaluate the direct displacement based seismic design (DDBD) method in the design of reinforced concrete shear walls. Direct Displacement-Based Design was developed by Priestley et. al. with the aim of mitigating deficiencies in the current force-based design. In this method, displacement leads to strength, which inverts the process of traditional force-based design, where strength leads to an estimate of displacement. For this purpose, four reinforced concrete shear walls with different heights (4, 8, 12 and 16 floors) are considered and designed, based on the displacement based seismic design method for a specified drift at roof level. The nonlinear time history analysis method with incremental acceleration (IDA) is used in order to analyze the shear walls. By comparing the results of analysis with design assumptions, it can be seen that the displacements predicted by the direct displacement based design method, conservatively, have a considerable difference with the results of time history analyses. Therefore, it is expected that in order to reach a certain displacement, the base shear of shear walls should be less than the base shear resulted from the DDBD method. From studies undertaken, the reasons for this difference were investigated. For this purpose, some of the assumptions of the DDBD method, such as "yield curvature", "yield displacement" and "base shear and the basis of substitute structure assumption", are considered and corrective recommendations are presented. By performing the proposed modifications in Direct Displacement Based Design, the designs of shear walls are repeated. In this case, in which the design method is based on the modified method, the conformity of analysis results from time history analyses and the design assumption is quite obvious. In this study, the nonlinear beam-column element is used to model reinforced concrete shear walls and confirmed using WCOMD finite element software. Numerical modelling and analyses of shear walls are performed using OpenSees.
