A Study of effect of floating vegetation on the formation of exchange flow

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A Study of effect of floating vegetation on the formation
of exchange flow
Amir Heshmatifar1, Mirmosadegh Jamali 2
Department of Civil Engineering, Sharif University of Technology, Tehran, Iran

Abstract
This study is concerned with the effect of floating vegetation on the exchange flow resulting from negative heat flux on open water by surface cooling. The problem configuration is comprised of two regions: open water and aquatic canopy area with floating vegetation. The negative heat flux resulting from night cooling, for example, makes a density difference between open water and canopy area, and hence drives an intrusion of warm water into the open region at the surface. Velocity distribution is measured by PIV method. The experiments are done for a range of vegetation density (0 to 15%) and root depth ratio (0 to 0.6). It is found that the drag in the canopy area is the most important factor affecting the exchange flow. The velocity of exchange flow is measured to be of the order 2 mms-1.
Keywords: exchange flow, surface cooling, PIV method, floating vegetation.

Effect of inelastic soil structure interaction on distribution of seismic vulnerability in special moment frame RC structures

اختصاصی از زد فایل Effect of inelastic soil structure interaction on distribution of seismic vulnerability in special moment frame RC structures دانلود با لینک مستقیم و پر سرعت .

 

Farhad Behnamfar - Department of Civil Engineering, Isfahan University of Technology, Esfahan 8415683111, Iran
Meisam Banizadeh - M.Sc. Student, Department of Civil Engineering, Isfahan University of Technology,Esfahan 8415683111, Iran

چکیده مقاله:

A complete nonlinear SSI model of a structural system on soft soil including an inelastic moment frame resting on a foundation on nonlinear Winkler springs is developed in this study. Various RC frames differing in height from 3 to 9 stories are studied. For each building a suit of 10 consistent earthquakes are selected and scaled. Each frame accompanied by its flexible base is analyzed under its associated earthquakes and the averages of its maximum responses are calculated. Story shear forces and plastic hinge rotations of beams and columns are determined. The results show that while the total hinge rotations decrease in each moment frame due to SSI, the plastic hinge rotations at the lower stories increase compared with when no SSI is taken into account. Thus distribution of vulnerability changes and the lower stories become more seismically vulnerable when the true flexible-base response is determined.

The Effect Of Iron In Al-Si Casting Alloys

اختصاصی از زد فایل The Effect Of Iron In Al-Si Casting Alloys دانلود با لینک مستقیم و پر سرعت .

مقاله لاتین در مورد

The Effect Of Iron In Al-Si Casting Alloys

Wave-passage effect on responses of MDOF systems in near field earthquakes

اختصاصی از زد فایل Wave-passage effect on responses of MDOF systems in near field earthquakes دانلود با لینک مستقیم و پر سرعت .

مقاله با عنوان: Wave-passage effect on responses of MDOF systems in near field earthquakes
نویسندگان: Mohsen Hajikazemian , 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 article responses of seven story building excited by the horizontal component of fault-parallel (permanent) displacement and fault-normal pulses with different magnitudes and time lags are investigated. In the considered model each storey consist of a rigid beam connected to two axially rigid mass-less columns by linear rotational springs and dashpots. The system of coupled equations of motion has been solved by the fourth-order Runge-Kutta method .The drift responses show that time lag of input ground motion records has influence on structure responses. Because of the large initial velocity present in the ground motion near earthquake faults the story drifts quickly exceed the typical design levels and fault-normal pulses produce more intense drift demands relative to those for fault-parallel displacements and it must be noticed in near fault zone designs.

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