Controllable resistance furnace suitable for three-dimensional frame structure fire test

Abstract

The invention relates to the technical field of building structure disaster prevention and reduction, and provides a controllable resistance furnace suitable for a three-dimensional frame structure fire test. The controllable resistance furnace comprises a base, a lower furnace body, an upper furnace body, an upper furnace body moving device, a high-frequency laser ranging sensor, a control systemand the like; the lower furnace body and the upper furnace body are designed in a split mode, and the lower furnace body can be mounted on the base in a left-right sliding mode; the high-frequency laser ranging sensor is connected with the control system and transmits the measured distance and speed to the control system; and the control system is connected with the upper furnace body moving device and used for controlling the upper furnace body moving device to drive the upper furnace body to slide along the lower furnace body according to the distance and the speed, and is synchronous withthe vertical deformation of the test three-dimensional frame structure. The controllable resistance furnace is suitable for the three-dimensional frame structure and allows large deformation of the tested three-dimensional frame structure, and meanwhile the upper furnace body and the lower furnace body are separated and designed, and the upper furnace body moves downwards relative to the lower furnace body through the upper furnace body moving device so as to achieve the synergistic deformation effect of the resistance furnace and the three-dimensional frame structure.

Description

technical field [0001] The application relates to the technical field of disaster prevention and mitigation of building structures, in particular to a controllable resistance furnace suitable for fire tests of three-dimensional frame structures. Background technique [0002] The collapse of buildings in fire is one of the secondary disasters of fire, and fire has caused great losses to human life and property. The steel structure is not fire-resistant. When the temperature rises to 600°C, the steel will lose most of its strength, causing damage to the fire-damaged components, which in turn will cause successive failures of surrounding components, and even the collapse of the structure, that is, continuous collapse. Therefore, it is of great practical significance to study how to prevent progressive collapse of steel structures in fires. [0003] At present, there are relatively few studies on progressive collapse tests of steel frame structures under fire at home and abroad...

AI Technical Summary

Problems solved by technology

The main reason for this situation is that the experimental research costs a lot of money and time, and the second is the lack of a resistance furnace that can be applied to the fire test of the three-dimensional frame structure.

Most of the current resistance furnaces can only be used for fire tests of plane frame structures or fire tests of three-dimensional frame structures without floors.

And, existing resistance furnace that is applicable to the fire test of plane frame structure has following defects: (1) because its height is fixed, can only heat the test piece of single height; (2) can only be applicable to the fire test of plane frame; (3) The heat preservation device is hung on the test piece, and the deformation is passive. Some test components may not be convenient to hang the heat preservation device; (4) After the test piece device is greatly deformed, the heat preservation device sinks, and a large gap appears above the furnace body. The heat will be exposed, and it is difficult for the electric furnace to continue to heat up

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