High stability liftable resistance furnace suitable for fire test of 3D frame structure

Abstract

This application relates to the technical field of disaster prevention and mitigation of building structures, and provides a high-stability liftable resistance furnace suitable for fire tests of three-dimensional frame structures, including a base, a lower furnace body, an upper furnace body, a lifting control device, a high-frequency laser measuring The distance sensor and control cabinet, etc.; the lower furnace body and the upper furnace body adopt a split design, and the lower furnace body can be slid left and right and installed on the base; the high-frequency laser ranging sensor is connected with the control cabinet, and the measured distance and The speed is transmitted to the control cabinet; the control cabinet is connected with the lifting control device, which is used to control the lifting control device according to the distance and speed to drive the upper furnace body to slide along the lower furnace body, and synchronize with the vertical deformation of the test three-dimensional frame structure. This application is adapted to the three-dimensional frame structure and allows large deformation of the three-dimensional frame structure to be tested, increases the out-of-plane stability and anti-torsion stability of the lifting device, and makes the upper furnace body move downward relative to the lower furnace body through the lifting control device Realize the synergistic 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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