Detachable support for three-side fire test of reinforced concrete beam and construction method

Abstract

The invention provides a detachable support for three-side fire test of a reinforced concrete beam and a construction method. The detachable support comprises first angle iron and second angle iron arranged opposite to the first angle iron, fixed steel bars for connecting the first and second angle iron are arranged uniformly along the length direction of the first and second angle iron, the two ends of each fixed beam are fixed to backs, positioned in the same plane, of the two angle iron respectively, two limiting nuts are fixedly arranged between two adjacent fixed steel bars on the backs in the same plane of the first and second angle iron, every two limiting nuts are cooperated with one steel bar latch, a support steel bar is arranged between the every two limiting nuts, and is cooperated with the steel bar latch via a rotary nut, and all the support bars extend to the outer sides of the first and second angle iron. The detachable support is simple in structure, convenient to operate, capable of dismounting and repeated use, low in cost, and realizes the condition of three-side bearing test for the reinforced concrete beam.

Description

technical field [0001] The invention belongs to the technical field of concrete buildings, and in particular relates to a detachable support and a construction method for fire tests on three sides of a reinforced concrete beam. Background technique [0002] Fire is a high-frequency disaster. When a fire occurs, the mechanical properties of structural materials are reduced, and the stiffness of structural members is also greatly degraded, resulting in a significant increase in the deformation of structural members. This not only reduces the bearing capacity of the building structure, but also endangers the lives and properties of the people. Therefore, sufficient attention should be paid to the research on the fire resistance performance of building structures. Among all kinds of buildings in our country, reinforced concrete structures account for the largest proportion. Compared with structural forms such as wood, bamboo, and steel structures, concrete itself is non-combu...

AI Technical Summary

Problems solved by technology

First, the gap between the beam and the furnace cover can only be plugged tightly with aluminum silicate refractory cotton to block the flame, but if the refractory cotton is too tight, it will restrain the deformation of the beam under fire, resulting in inaccurate measurement of the deformation of the beam Accurate; at the same time, with the prolongation of the fire time, the deformation of the beam will gradually increase, causing the refractory cotton that has been plugged to loosen and fall off into the furnace, and the flame will burst out immediately, which may easily lead to a fire accident. Therefore, this method is not suitable. Safe and reliable

Second, after the test is completed, a large amount of refractory cotton will fall off into the fire furnace, which cannot be used for secondary use, especially when the distance between the furnace cover and the beam is too large, more refractory cotton will fall off, causing waste

This method has the following three disadvantages: first, when the material of the furnace cover is not suitable for installing expansion bolts, this method is not feasible; second, installing expansion bolts on the top surface of the furnace cover and beam will not only cause The local damage of the beam will also affect the mechanical performance of the beam

Third, the process of setting expansion bolts and weaving barbed wire must be repeated before each test, which is time-consuming and labor-intensive. It is inconvenient to disassemble and assemble the device after the test is completed, and the device cannot be reused, resulting in waste

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