High-stability liftable and lowerable resistance furnace suitable for three-dimensional frame structure fire hazard experiment

Abstract

The invention relates to the technical field of the disaster prevention and reduction of a building structure, and provides a high-stability liftable and lowerable resistance furnace suitable for a three-dimensional frame structure fire hazard experiment. The resistance furnace comprises a foundation bed, an upper furnace body, a lower furnace body, a lifting and lowering control device, a high-frequency laser distance measurement sensor, a control cabinet and the like, wherein the lower furnace body and the upper furnace body adopt split type design; the lower furnace body is installed on thefoundation bed in a left and right sliding way; the high-frequency laser distance measurement sensor is connected with the control cabinet and transmits a measured distance and speed to the control cabinet; and the control cabinet is connected with the lifting and lowering control device for controlling the lifting and lowering control device according to a distance and a speed to drive the upperfurnace body to slide along the lower furnace body, and the upper furnace body and the lower furnace body have synchronous vertical deformation with the vertical deformation of a tested three-dimensional frame structure. The resistance furnace disclosed by the invention is suitable for the three-dimensional frame structure, the tested three-dimensional frame structure is permitted to generate bigdeformation, the out-of-plane stability and the anti-torsion stability of the lifting and lowering device are improved, and the upper furnace body upwards moves relative to the lower furnace body through the lifting and lowering control device so as to realize a collaborative deformation effect of the resistance furnace and the three-dimensional frame structure.

Description

technical field [0001] The invention relates to the technical field of disaster prevention and mitigation of building structures, in particular to a high-stability liftable resistance furnace suitable for fire tests of three-dimensional frame structures. Background technique [0002] High temperature has a significant impact on the material properties of the structure, especially the mechanical properties. For example, the yield strength and elastic modulus of structural steel decrease with the increase of temperature. When the temperature exceeds 600 °C, structural steel will lose most of its strength and stiffness. When a fire breaks out, the air inside the building can reach 800-1000°C within half an hour, so the building structure is extremely vulnerable to damage in the fire. In the frame structure, the frame column is the main load-bearing component, and its failure in the fire may cause the collapse of the whole building. Therefore, the research on the fire resistance...

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Problems solved by technology

[0003] At present, most of the resistance furnaces in China 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 structure of the test piece 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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