p8pbb Bridge 3.2.18

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p8pbb Bridge 3.2.18   >>>   پشتیبانی از جوملا 2.5 و 3

In-plane Response of a Three-span Simply Supported Bridge to Near-fault Strong Ground Motion

اختصاصی از یارا فایل In-plane Response of a Three-span Simply Supported Bridge to Near-fault Strong Ground Motion دانلود با لینک مستقیم و پرسرعت .

مقاله با عنوان: In-plane Response of a Three-span Simply Supported Bridge to Near-fault Strong Ground Motion
نویسندگان: Milad Veisi , Reza Saleh Jalali
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:
In this paper a simple model of a three-span simply supported bridge excited by the horizontal component of fault-normal pulse with different magnitudes and time lags has been considered. In the considered model the axially rigid mass-less piers are connected at the top to the rigid decks by hinges and at the bottom to the ground by linear rotational springs and dashpots. For determination of the pounding force between decks, the linear viscoelastic model has been chosen. It is assumed that the bridge is near the fault and the excitations at all piers have the same amplitude but differ in terms of phase. The system of equations of motion has been solved by the fourth-order Runge-Kutta method because of its self-starting feature and the long-range stability. For a range of main period of the bridge, the maximum impact force between decks and the minimum gap size required to avoid collision can be determined under fault-normal pulse with different magnitudes and time lags. It could be concluded from the results that time lag plays a very important role in determining maximum impact force and it’s better to use softer piers to reduce the maximum impact force and the minimum gap size required to avoid collision between decks.

** 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 یارا 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. **