Abstract
The poor fire resistance characteristic of super high-rise curtain wall makes the curtain wall design one of the main approaches to improve its capacity for prevention and control over fire and smoke spread. The propagation of smoke leads to the increase in the temperature of the curtain wall on the upper and lower floors of the fire floor and consequently leads to glass fracture and other serious consequences. Current codes have control over fire resistance performance and size of fire partition materials but do not include requirements on the position of curtain walls on floors. By changing the position of fire partition in curtain walls, the paper carries out three comparative simulation experiments on two forms of fire partition: spandrel and fire prevention cornice. Besides, PyroSim is used to calculate the comparative simulation of fire and smoke spread and obtain the data on temperature variation nephogram and monitoring points in the center line of glass curtain walls during different fire scenarios, so as to discuss the influence of different positions of spandrels and fire canopy on fire hazard and smoke. This study finds out the following: fire canopy can better prevent the longitudinal spread of fire smoke than spandrels. The fire canopy above spandrels can reduce the flue-gas temperature. The higher the spandrels above floors, the faster the temperature of the central lines of glass curtain walls above fire floors reduced. However, the higher the spandrels above floors, the more uneven the distributions of high-temperature regions and low-temperature regions, thus leading to the increase in horizontal temperature differences of glass panels. This research conclusion can be taken as a reference for fire protection design of super high-rise glass curtain wall.
Highlights
Tempered glass is extensively used in the curtain wall in modem high-rise buildings [1]. rough the analysis of super high-rise building fire, vertical spread on exterior walls is an important form of fire spread in high-rise building [2]. ere are more demanding requirements on design for fire protection in the use of glass curtain wall
The fire and smoke temperature cloud pictures and the temperature change curve of the monitoring point for the required area in the model could be visualized in the simulation results through setting the model [18]. e main contributions of this paper are gaining the temperature value of central line in adjacent floor and glass panel by changing the position of fire partition, analyzing the vertical temperature variation curve of curtain wall and temperature distribution of glass panel, and discussing the possible negative factors of adjacent floor explosion, thereby choosing effective fire partition settings and fire-fighting devices
According to the requirements of national codes, fire partition in the form of a spandrel with a height no less than 1200 mm or a fire canopy with a width of no less than 1000 mm is needed for partition in the cross story section of the glass curtain walls
Summary
E simulation process was divided into the following steps: (1) establishing geometric model; (2) setting the fire scene including fire origin location and fire load, simulation range and boundary conditions, fire resistance performance of the glass curtain wall, the monitoring point and the slice location to obtain data, grid density, and the simulation time; (3) calculating through FDS/smokeview for simulation calculation and postprocessing for the result In this process, the fire and smoke temperature cloud pictures and the temperature change curve of the monitoring point for the required area in the model could be visualized in the simulation results through setting the model [18]. The fire and smoke temperature cloud pictures and the temperature change curve of the monitoring point for the required area in the model could be visualized in the simulation results through setting the model [18]. e main contributions of this paper are gaining the temperature value of central line in adjacent floor and glass panel by changing the position of fire partition, analyzing the vertical temperature variation curve of curtain wall and temperature distribution of glass panel, and discussing the possible negative factors of adjacent floor explosion, thereby choosing effective fire partition settings and fire-fighting devices
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