A Simplified Model for Smoke Filling Time Calculation with Sprinkler Effects

2005 ◽  
Vol 23 (4) ◽  
pp. 279-301 ◽  
Author(s):  
Kee-Chiang Chung ◽  
Hsing-Sheng Tung
Keyword(s):  
Simplified Model ◽  
Filling Time ◽  
Time Calculation ◽  
Smoke Filling

Numerical Analysis of a MDOF Structure Protected With TMD Techniques

2009 ◽  
Author(s):  
Vincenzo Moretti ◽  
Maurizio De Angelis ◽  
Nicola Ranieri ◽  
Ivan Roselli
Keyword(s):  
Numerical Analysis ◽  
Numerical Study ◽  
Frame Structure ◽  
Equivalent Model ◽  
Simplified Model ◽  
Tuned Mass Dampers ◽  
Control Techniques ◽  
Seismic Control ◽  
Time Calculation ◽  
Steel Frame Structure

In the present paper a complete numerical study of a 1:5 scaled four-storey steel-frame structure with the application of Tuned Mass Dampers (TMD) is reported. In particular, Passive Tuned Mass Dampers (PTMD), Semi-Active Tuned Mass Dampers (SATMD), and Hybrid Tuned Mass Dampers (HTMD) were considered and compared. The initial aim of this work was to define a Simplified Equivalent Model to be conveniently utilized for simulations instead of a realistic Prototype Numerical Model in order to estimate the designing parameters of the devices with good approximation and sensible time calculation saving. Subsequently, the feasibility, the reliability and the effectiveness of the considered seismic control techniques were also assessed. The results of the numerical analysis showed how the use of a simplified model allows to estimate the designing parameters with accuracy. More importantly, the numerical results showed to what extent the several TMD techniques revealed to be effective for the seismic response reduction.

Evaluation of the room smoke filling time for fire plumes: Influence of the room geometry

2020 ◽  
Vol 44 (6) ◽  
pp. 793-803
Author(s):  
S. Haouari‐Harrak ◽  
R. Mehaddi ◽  
P. Boulet ◽  
E.M. Koutaiba
Keyword(s):  
Fire Plumes ◽  
Filling Time ◽  
Smoke Filling

scholarly journals Impact of the room geometry on the smoke filling time due to a fire plume

2018 ◽  
Vol 1107 ◽  
pp. 042022 ◽  
Author(s):  
Samia Haouari Harrak ◽  
El Mehdi Koutaiba ◽  
Rabah Mehaddi ◽  
Pascal Boulet ◽  
Simon Becker
Keyword(s):  
Fire Plume ◽  
Filling Time ◽  
Smoke Filling

Parametrization of the fire-smoke exhaust system for a large and high-rise atrium in Shanghai through salt-bath experiment

2016 ◽  
Vol 26 (2) ◽  
pp. 272-291 ◽  
Author(s):  
Jian Wang ◽  
Juan Gui ◽  
Jun Gao ◽  
Xueli Hu
Keyword(s):  
Exhaust System ◽  
Salt Bath ◽  
Design Parameters ◽  
Smoke Movement ◽  
High Rise ◽  
Filling Time ◽  
Fire Smoke ◽  
Computational Fluid Dynamics Simulations ◽  
Dynamics Simulations ◽  
Smoke Filling

Present specifications in Building Codes in China lack design parameters for smoke exhaust for large and high-rise atrium in buildings. An investigation of natural smoke filling and parametrization of fire-smoke exhaust in an atrium building in Shanghai was conducted based on salt-bath experiment, due to dynamic analogy between thermal smoke movement in air and brine dispersion in water. To obtain a small, scaled-down version of an atrium with a high polyfoam fire up to 1 MW, the brine-bath experiment was conducted with calcium chloride for small strength fire in small-space rooms, to demonstrate the natural smoke filling within the atrium. The interface height and filling time derived was highly comparable to those obtained by empirical equations. The results of computational fluid dynamics simulations agreed well with the salt-bath experiments. The evacuation time was also calculated with a dimensionless interface height of 0.2 to determine whether there was sufficient time for occupants to escape. The smoke filling process under mechanical smoke exhaust was also investigated by experiments, to parametrize the fire smoke exhaust system in the atrium. The optimal smoke exhaust level, natural and mechanical make-up level were determined and were recommended as the design parameters for the construction of atrium in buildings.

A Short Note on Using a Time Constant in Specifying Smoke Filling Time in an Atrium Under an Unsteady Fire

1995 ◽  
Vol 13 (6) ◽  
pp. 434-444 ◽  
Author(s):  
W.K. Chow
Keyword(s):  
Control Systems ◽  
Time Constant ◽  
Short Note ◽  
Zone Model ◽  
Smoke Control ◽  
Fire Zone ◽  
Filling Time ◽  
Version 2.0 ◽  
Smoke Filling

A time constant derived from a t-squared fire with the geometry of an atrium is proposed to specify the smoke filling time. The smoke filling pro cesses in 27 atria with volume varying from 2,500 to 35,000 m3 were simulated by the fire zone model CFAST version 2.0. The atria are located adjacent to a "fire" shop at a lower level. Correlation relationships between the smoke filling time and the time constant are derived. Further, performance of smoke control systems in the atria are evaluated.

scholarly journals Simple Equations for Predicting Smoke Filling Time in Fire Rooms with Irregular Ceilings

2005 ◽  
Vol 24 (4) ◽  
pp. 165-177 ◽  
Author(s):  
Jun-ichi Yamaguchi ◽  
Takeyoshi Tanaka
Keyword(s):  
Filling Time ◽  
Simple Equations ◽  
In Fire ◽  
Smoke Filling

Correlation of Data Obtained by Radiocardiography and Right-Heart Catheterization in Cardiac Patients

1968 ◽  
Vol 07 (02) ◽  
pp. 125-129
Author(s):  
J. Měštan ◽  
V. Aschenbrenner ◽  
A. Michaljanič
Keyword(s):  
Capillary Pressure ◽  
Transit Time ◽  
Right Heart Catheterization ◽  
Heart Catheterization ◽  
Right Heart ◽  
Pulmonary Capillary ◽  
Filling Time ◽  
Pulmonary Capillary Pressure ◽  
The Mean ◽  
Pulmonary Transit Time

SummaryIn patients with acquired and congenital valvular heart disease correlations of the parameters of the radiocardiographic curve (filling time of the right heart, minimal pulmonary transit time, peak-to-peak pulmonary transit time, and the so-called filling time of the left heart) with the mean pulmonary artery pressure and the mean pulmonary “capillary” pressure were studied. Further, a regression equation was determined by means of which the mean pulmonary “capillary” pressure can be predicted.

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