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Probabilistic Seismic Demand of 2-D Steel Moment Resisting Frames in Estimation of Collapse under Earthquake Ground Motions Pedram Khajehhesameddin Eastern Mediterranean University June 2010 Gazimağusa, North Cyprus پایان نامه کارشناسی ارشد: ارزیابی احتمالاتی نیاز لرزه ای قاب خمشی فولادی دو بعدی در برآورد گسیختگی تحت حرکات زلزله منبع @Civilbest_تخمین_گسیختگی_قاب_خمشی.pdf

THE INCREMENTAL DYNAMIC ANALYSIS AND ITS APPLICATION TO PERFORMANCE-BASED EARTHQUAKE ENGINEERING Dimitrios Vamvatsikos1 and C. Allin Cornell2 1Graduate Student, Department of Civil and Environmental Engineering, Stanford University, CA 94305-4020 2Professor, Department of Civil and Environmental Engineering, Stanford University, CA 94305-4020 ABSTRACT Incremental Dynamic Analysis (IDA) is an emerging analysis method that offers thorough seismic demand and capacity prediction capability by using a series of nonlinear dynamic analyses under a multiply scaled suite of ground motion records. Realization of its opportunities requires several innovations, such as choosing suitable ground motion Intensity Measures (IMs) and representative Damage Measures (DMs). In addition, proper interpolation and summarization techniques for multiple records need to be employed, providing the means for estimating the probability distribution of the structural demand given the seismic intensity. Limit-states, such as the dynamic global system instability, can be naturally defined in the context of IDA, thus allowing annual rates of exceedance to be calculated. Finally, the data gathered through IDA can provide intuition for the behavior of structures and shed new light on the connection between the Static Pushover (SPO) and the dynamic response. To illustrate all the above concepts, a complete walkthrough of the methodology is presented by using a 9-storey steel moment-resisting frame with fracturing connections as an example to explain and clarify the application of the IDA to Performance-Based Earthquake Engineering (PBEE). Keywords: performance-based earthquake engineering, incremental dynamic analysis, demand, collapse capacity, limit-state, nonlinear dynamic analysis, static pushover به نقل از گروه تلگرام دستنامه زلزله دانلود از پیوست Incremental Dynamic Analysis.pdf

SEISMIC DESIGN OF STEEL STRUCTURES BASED ON DUCTILITY AND INCREMENTAL NONLINEAR DYNAMIC ANALYSIS H. Kermani, F. Behnamfar and V. Morsali Abstract In this paper a simple tool for seismic design of steel structures for a selected ductility level is presented. For this purpose, a consistent set of earthquakes is selected and sorted based on the maximum acceleration of ground surface. The selected records are applied as the base motion to a single-degree-of-freedom system with strain hardening and the maximum response acceleration is determined for three levels of ductility. The response results of the incremental nonlinear dynamic analysis are presented in the shape of the maximum acceleration of the system versus the peak ground acceleration for a certain ductility demand. Using these graphs, the maximum acceleration and base shear of the system are calculated accounting for its nonlinear behavior, hence eliminating the need for the response modification factor. This is the main advantage of the presented diagrams for nonlinear seismic design of steel moment frames. Keywords ductility, incremental dynamic analysis, seismic design. چکیده در این مقاله، ابزاری ساده برای طراحی لرزه­ای سازه­های فولادی به ازای سطوح شکل­پذیری انتخاب شده ارائه شده است. برای این منظور، مجموعه­ای از زلزله­های سازگار انتخاب و براساس ماکزیمم شتاب دسته­بندی شده­اند. رکوردهای انتخاب شده به­عنوان حرکت پی به سیستم یک­درجه آزاد با رفتار کرنش سخت شونده اعمال شده و حداکثر شتاب براساس سطوح شکل­پذیری تعیین می­گردد. نتایج پاسخ­های حاصل از تحلیل فزاینده غیرخطی، به­صورت دیاگرام­هایی مربوط به حداکثر بازتاب شتاب سیستم در مقابل ماکزیمم شتاب زمین (PGA) برای یک نیاز شکل­پذیری خاص نشان داده شده است. با استفاده از این شکل­ها، بیشترین شتاب و برش پایه سیستم برای رفتار غیرخطی بدون نیاز به عامل ضریب رفتار محاسبه می­گردد، که از مزایای اصلی این دیاگرام­ها برای طراحی لرزه­ای غیرخطی قاب­های خمشی فولادی است. منبع دانلود 29-1-4.pdf