Comparison of Alternative Methods for Incremental Dynamic Analysis

اختصاصی از کوشا فایل Comparison of Alternative Methods for Incremental Dynamic Analysis دانلود با لینک مستقیم و پرسرعت .

مقاله با عنوان: Comparison of Alternative Methods for Incremental Dynamic Analysis
نویسندگان: Mona Hemmati , Reza Karami Mohammadi , Ali A. Pirasteh
محل انتشار: هشتمین کنگره ملی مهندسی عمران - دانشگاه صنعتی نوشیروانی بابل - 17 و 18 اردیبهشت 93
محور: دینامیک سازه
فرمت فایل: PDF و شامل 8 صفحه به انگلیسی می باشد.

چکیده:
The conventional Incremental Dynamic Analysis (IDA) -a parametric method- is a collection of time history analyses under ground motion records which is scaled to different intensity levels. This range is selected so that can cover all structural behavior. Finally, the results are illustrated in one or more diagrams known as IDA curves. Based on recent studies, a few alternative methods to gain the IDA curves have been proposed. In this essay, the proposed methods are discussed and compared. Then the comparison and advantageous of different methods are discussed for a moment-resisting frame (MRF) under a certain earthquake record.

** توجه: خواهشمندیم در صورت هرگونه مشکل در روند خرید و دریافت فایل از طریق بخش پشتیبانی در سایت مشکل خود را گزارش دهید. **

Probabilistic Quantification of Incremental Dynamic Analysis Results

اختصاصی از کوشا فایل Probabilistic Quantification of Incremental Dynamic Analysis Results دانلود با لینک مستقیم و پرسرعت .

مقاله با عنوان: Probabilistic Quantification of Incremental Dynamic Analysis Results
نویسندگان: Azad Yazdani , Hessan Salehi
محل انتشار: هشتمین کنگره ملی مهندسی عمران – دانشگاه صنعتی نوشیروانی بابل - 17 و 18 اردیبهشت 93
فرمت فایل: PDF و شامل 6 صفحه می باشد.

چکیده:
Incremental Dynamic Analysis (IDA) is a parametric analysis method that has recently emerged in several different forms to estimate more thoroughly structural performance under seismic load. It involves subjecting a structural model to one or more ground motion records. This method considers both inherent randomness and model uncertainty, so it used to probabilistic analysis of structures at high seismic loading. The objective of this study is to improve efficient, but accurate procedures for probabilistic analysis of nonlinear seismic behavior of structure. According to the three-parameter Log-normal distribution more rationally describe maximum story drift ratio at a higher value of spectral acceleration. The traditional method based on two-parameter Log-normal distribution is compared with the presented procedure based on three-parameter Log-normal distribution on analytical data. Improvement in the probabilistic estimation of maximum story drift ratio demand are illustrate with a SAC-9 story, moment resisting frame building exposed to a set of 20 ground motion.

** توجه: خواهشمندیم در صورت هرگونه مشکل در روند خرید و دریافت فایل از طریق بخش پشتیبانی در سایت مشکل خود را گزارش دهید. **

Structural Dynamics Analysis Using Non-Uniform Fast Fourier Transform in Frequency Domain

اختصاصی از کوشا فایل Structural Dynamics Analysis Using Non-Uniform Fast Fourier Transform in Frequency Domain دانلود با لینک مستقیم و پرسرعت .

مقاله با عنوان: Structural Dynamics Analysis Using Non-Uniform Fast Fourier Transform in Frequency Domain
نویسندگان: Mohammad S. Ayubirad , Mostafa A. Ayubirad , Jalal Akbari
محل انتشار: هشتمین کنگره ملی مهندسی عمران – دانشگاه صنعتی نوشیروانی بابل - 17 و 18 اردیبهشت 93
فرمت فایل: PDF و شامل 8 صفحه به انگلیسی می باشد.

چکیده:
Nonuniform seismic motion affects the seismic behavior of large structures such as long-span bridges. Three main reasons for this nonuniformity have been identified. They are local soil conditions, wave passage, and incoherency effects. Other effects, such as extended source and attenuation, are relatively small. The importance of nonuniform seismic motions, especially for sensitive and important structures, has led to the development of several methods of analysis. This paper presents a direct frequency-domain method that is based on neural network and optimization. The use of this direct frequency-domain method for solving nonuniform seismic motions is shown. Finally, the application of the proposed method to a simple multiple particle damped system under harmonic loading is presented and the validity and feasibility of the transformation algorithm in time-domain and frequency-domain are numerically verified.

** توجه: خواهشمندیم در صورت هرگونه مشکل در روند خرید و دریافت فایل از طریق بخش پشتیبانی در سایت مشکل خود را گزارش دهید. **

مقاله ISI با عنوان: Analysis of a bridge failure due to fire using computational fluid dynamics and finite element models

اختصاصی از کوشا فایل مقاله ISI با عنوان: Analysis of a bridge failure due to fire using computational fluid dynamics and finite element models دانلود با لینک مستقیم و پرسرعت .

مقاله ISI با عنوان: Analysis of a bridge failure due to fire using computational fluid dynamics and finite element models
ژورنال: Engineering Structures
محتوای مقاله: آنالیز شکست پل در اثر حریق
پژوهشگران: J. Alos-Moya, I. Paya-Zaforteza, M.E.M. Garlock, E. Loma-Ossorio, D. Schiffner, A. Hospitaler
سال 2014
فرمت فایل: PDF و شامل 15 صفحه

چکیده:
Bridge fires are a major concern because of the consequences that these kind of events have and because they are a real threat. However, bridge fire response is under researched and not covered in the codes. This paper studies the capabilities of numerical models to predict the fire response of a bridge and provides modeling guidelines useful for improving bridge design. To reach this goal, a numerical analysis of the fire of the I-65 overpass in Birmingham, Alabama, USA in 2002 is carried out. The analyses are based on computational fluid dynamics (CFD) for creating the fire model, and finite element (FE) software for obtaining the thermo-mechanical response of the bridge. The models are validated with parametric studies that consider heat release rate of the spilled fuel, discretization of the fire temperature in the transition from CFD to FE modeling, and boundary conditions. The validated model is used in a study to evaluate the influence of fire scenario (CFD versus standard fires), and live load. Results show that numerical models are able to simulate the response of the bridge and can be used as a basis for a performance-based approach for the design of bridges under fire. Additionally, it is found that applying the Eurocode standard and hydrocarbon fires along the full length of the bridge does not adequately represent a real bridge fire response for medium-long span bridges such as this case study. The study also shows that live loads essentially do not influence the response of the bridge.


لینک مقاله در سایت www.sciencedirect.com :
http://www.sciencedirect.com/science/article/pii/S0141029614001151


** نحوه سفارش مقالات ISI: پس از پیدا کردن مقالات درخواستی خود از پایگاه‌های علمی همانند sciencedirect.com لینک مقالات مورد نظر خود را به ایمیل [e-mail] ارسال کرده پس از قرار گرفتن مقالات در سایت می توانید به صورت آنلاین اقدام به خرید و دریافت مقاله نمایید. **

** توجه: خواهشمندیم در صورت هرگونه مشکل در روند خرید و دریافت فایل از طریق بخش پشتیبانی در سایت مشکل خود را گزارش دهید. **

رساله دکتری با عنوان: Dynamic Finite Element Modeling and Analysis of Blast-resistant Sandwich Structures

اختصاصی از کوشا فایل رساله دکتری با عنوان: Dynamic Finite Element Modeling and Analysis of Blast-resistant Sandwich Structures دانلود با لینک مستقیم و پرسرعت .

رساله دکتری با عنوان: Dynamic Finite Element Modeling and Analysis of Blast-resistant Sandwich Structures
دانشگاه : University of Connecticut
استاد راهنما: Jeong-Ho Kim
پژوهشگر: Linhui Zhang
سال 2012
فرمت فایل: PDF و شامل 165 صفحه

چکیده:
Blast-resistant composites and structures are gaining more and more academic and industrial interests currently. The metal sandwich structure is proven to perform better than the monolithic plate with the same mass under blast loading. Besides, the foam or foam-like cores with stacking of graded layers can further mitigate the blast effects. In this work, the dynamic responses of corrugated sandwich plates with various homogeneous and graded core arrangements under shock tube loading are investigated by finite element method. By comparing the maximum back face deflection, maximum back face velocity, plastic energy absorption, stress history and contact force, the corrugated sandwich plate with the gradually graded core has a better overall performance.
The parametric study on unit-cell corrugated and trapezoid sandwich structures with given mass and various core arrangements subjected to idealized air-blast loading is also carried out. The sandwich structures with graded cores can prevent the structure to get fully crushed. It is also shown that the trapezoid sandwich structures have larger impact tolerance, but the trapezoid sandwich structures are more sensitive to the initial geometric imperfections than corrugated sandwich structures.
Due to the benefits of the graded cores, a modified rule of mixture and linear strain-rate dependence are used to derive the rate-dependent elastic-plastic constitutive relation for functionally graded (FG) material. The derived constitutive relations are implemented in ABAQUS/Explicit through a VUMAT subroutine to simulate the dynamic response of a FG plate subjected to shock tube loading.


مشاهده آنلاین و دریافت فایل نمونه:
https://drive.google.com/file/d/0B3BBM5yT_t4ZWkUxUGdNRzNLS0k


** توجه: خواهشمندیم در صورت هرگونه مشکل در روند خرید و دریافت فایل از طریق بخش پشتیبانی در سایت مشکل خود را گزارش دهید. **