Damping Earthquake and Wind Energy in Tall Building by Frictional Semi-Active Dampers

اختصاصی از کوشا فایل Damping Earthquake and Wind Energy in Tall Building by Frictional Semi-Active Dampers دانلود با لینک مستقیم و پرسرعت .

مقاله با عنوان: Damping Earthquake and Wind Energy in Tall Building by Frictional Semi-Active Dampers
نویسندگان: M. Askarpour and M. Miri
محل انتشار: هشتمین کنگره ملی مهندسی عمران - دانشگاه صنعتی نوشیروانی بابل - 17 و 18 اردیبهشت 93
محور: دینامیک سازه
فرمت فایل: PDF و شامل 11 صفحه به انگلیسی می‌باشد.

چکیده:
This article will optimize the brace in Abaqus (analyzing software) in order to find best place and length of the brace at the corner of frame and also will recommend how many braces are needed for tall buildings in order to resist lateral and shear forces.
This report is broken down into 5 different sections. The first section introduces problems that tall buildings are facing to and will give some different solutions to those problems. The next section would explain four comment solutions in more details. The following section explains methods that were used in Abaqus software and also it will describe the assumptions that have been made in order to model the object in to the software. In result section outlines of different input commands has been applied within Abaqus software. Final sections contain a discussion and conclusion about those results.

** 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: Behavior and mechanisms of steel plate shear walls with coupling

اختصاصی از کوشا فایل مقاله ISI با عنوان: Behavior and mechanisms of steel plate shear walls with coupling دانلود با لینک مستقیم و پرسرعت .

مقاله ISI با عنوان: Behavior and mechanisms of steel plate shear walls with coupling
ژورنال: Journal of Constructional Steel Research
محتوای مقاله: سیستم دیوارهای برشی فولادی
پژوهشگران: Daniel J. Borello, Larry A. Fahnestock
سال 2012
فرمت فایل: PDF و شامل 9 صفحه

چکیده:
The Steel Plate Shear Wall with Coupling (SPSW-WC) system consists of a pair of planar SPSWs linked together with coupling beams at the floor levels. The degree of coupling, which represents the level of interaction between the two piers, and the plastic strength for a SPSW-WC are important parameters in understanding behavior and developing designs for the system. This paper examines these two parameters using plastic analysis and numerical simulations of single story and multi-story SPSW-WC configurations. The focus is on desirable uniform-yielding mechanisms, but soft-story mechanisms are also briefly discussed, and analytical closed-form expressions are developed for ultimate strength and degree of coupling. Thirtytwo SPSW-WC structures are designed with emphasis on varying the following parameters: height of the structure (number of stories), coupled length and coupling beam properties. These structures are studied with numerical models using monotonic nonlinear static analysis. Good agreement is observed between the numerical simulations and the analytical predictions for the ultimate strength and degree of coupling. The degree of coupling is shown to have a significant impact on structural weight, particularly for the taller structures studied, and the optimal degree of coupling to maximize material efficiency is found to be in the range of 0.4 to 0.6.

لینک مقاله در سایت www.sciencedirect.com :
http://www.sciencedirect.com/science/article/pii/S0143974X11003324


** نحوه سفارش مقالات ISI: پس از پیدا کردن مقالات درخواستی خود از سایت www.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. **

دانلود کتاب ارزشمند Study Chess with Tal-Mikhail Tal and Alexander Koblenz

اختصاصی از کوشا فایل دانلود کتاب ارزشمند Study Chess with Tal-Mikhail Tal and Alexander Koblenz دانلود با لینک مستقیم و پرسرعت .

Study Chess with Tai
Alexander Koblencs and Mikhail Tai
Translated by Mike Price
BATS

نویسنده : میخائیل تال و الکساندرکوبلنز

فرمت : pdf

تعداد صفحات :269  با قابلیت کپی و چاپ صفحات

محصول 2013 

انتشارات باتسفورد

میخایل تال در سن 23 سالگی در سال 1960 به جوانترین قهرمان جهان تبدیل شد هنو ز توانایی های تاکتیکی میخال تال به طور کامل توسط هیچ کس منتشر نشده بود این کتاب منحصر به فرد برای اولین بار در سال 1980 منتشر شد و کتاب حاصر در سال  2013 تجدید چاپ شد این کتاب نشان میدهد که چگونه تال عظمت خود را به دست آورد  و به خوانندگان مدرن نگاهی اجمالی به توسعه یک نابغه واقعی شطرنج.

• Paperback: 272 pages
• Publisher: Batsford (September 3, 2013)
• Language: English
• ISBN-10: 1849941092

In 1960, on his very first attempt, 23-year-old Mikhail Tal became the youngest chess champion in history. No one has yet surpassed his extraordinary tactical ability. This exceptional manual, first published in the early 1980s, is based on diaries kept by Tal's coach and includes a fully revised algebraic version of the classic text. It shows how Tal achieved his greatness and gives modern readers a glimpse of the development of a true chess genius.

رساله دکتری با عنوان: Multi-Scale Adhesion and Fracture: From Eco-friendly Structures to Biomedical Devices

اختصاصی از کوشا فایل رساله دکتری با عنوان: Multi-Scale Adhesion and Fracture: From Eco-friendly Structures to Biomedical Devices دانلود با لینک مستقیم و پرسرعت .

رساله دکتری با عنوان: Multi-Scale Adhesion and Fracture: From Eco-friendly Structures to Biomedical Devices
دانشگاه : Princeton University
استاد راهنما: Winston Soboyejo
پژوهشگر: Ting Tan
سال 2011
فرمت فایل: PDF و شامل 166 صفحه

چکیده:
This thesis presents the results of a combined experimental, analytical and numerical study of fracture and adhesion in: sustainable building materials (bamboo and natural fiber-reinforced composites), restoration of a historical statue (Adam by Tullio Lombardo), and drug eluting stents. In each of these cases, multi-scale mechanism-based models were used to predict robustness.
In an effort to study the functionally graded bamboo structure, bamboo cross sections were examined using optical microscopy. This revealed the details of the functionally graded distribution of fiber bundles. Atomic Force Microscopy (AFM) was also used to characterize the microstructures of the molecular fiber bundles. Then, nano-indentation was used to measure the graded elastic moduli along with the radial direction. The measured elastic moduli were incorporated in finite element simulation of deformation and crack growth in resistance-curve experiments. The predictions from the models were in agreement with measured resistancecurves obtained for moso culm bamboo in the outside, inside and side orientations.
OPC-based cementitious fiber reinforced composites were fabricated using slurry vacuum method with carbonate filler, phyllite or metakaolin matrices and polypropylene or sisal fibers. Optical microscopy was used to study the in-situ fiber-bridging images obtained during three-point bend fracture/resistance-curve experiments. Single-fiber tensile tests were also used to measure the fiber tensile strengths. The measured fiber strengths were included in crack bridging models that were used to predict composite resistance-curve behavior. The predictions were in good agreement with the measured resistance curves.
Drug Eluting Stents (DES) are small drug coated scaffolds used to open the blocked arteries for patients with cardiovascular diseases. The CYPHER ® stent is a multilayered structure with drug, parylene C and bare 316L steel layers. Based on prior AFM adhesion work, Brazil Nut experiments were performed to measure the interfacial fracture energy release rate for the interface of silane-parylene and bare 316L steel at various mode mixities. Interfacial fracture mechanics models were used to then link nano-scale AFM measurements of adhesives to microscale fracture mechanics measurement of interfacial fracture energies at different mode mixities.
Brazil Nut is used to study the subcritical crack growth rate in marble/adhesive interfaces. Four types of adhesives, Paraloid B72, Paraloid B48, a hybrid of B72/B48 and Epoxy, were selected to bond the Carrara marble Brazil Nut disks with fractured and smooth surfaces. Creep crack growth experiments were used to measure the dependence of energy release rates on crack growth rates between the Carrara marble and thermoplastic and thermosetting adhesives. The measured crack growth rates were incorporated into fracture mechanics predictions of service lives that were shown to be consistent with the lives of historical objects.


مشاهده آنلاین و دریافت فایل نمونه:
https://drive.google.com/file/d/0B3BBM5yT_t4ZcDJDdURBYVNjdUE


** 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. **