System for testing fire resistance of reinforced concrete plate under effect of boundary restriction by utilizing jack

Abstract

The invention discloses a system for testing fire resistance of a reinforced concrete plate under effect of boundary restriction by utilizing a jack. The system comprises a test furnace device (1), a boundary restriction device (2), a loading article (3) and a control and data acquisition device (4), wherein a steel ball (1.2) and a steel rolling shaft (1.3) are arranged between the top surface of a furnace body (1.1) and a reinforced concrete test floor slab (5); the boundary restriction device comprises a grooved support (2.1), a steel support (2.2), a steel strand (2.4), a jack (2.5) and a steel strand clamp (2.6); the control and data acquisition device comprises a central processor, a flame control loop, a temperature acquisition loop, a displacement acquisition loop, a strain acquisition loop and a jack control loop. According to the system for testing the fire resistance, the interaction between two adjacent components of the structure in the fire is approximately considered by a way of applying restriction to the boundary of the component, so that the influence law of different boundary restriction action on the fire resistance of the reinforced concrete plate can be researched conveniently.

Description

technical field [0001] The invention relates to a reinforced concrete floor slab fire resistance test system, in particular to a reinforced concrete floor slab fire resistance test system using jacks for boundary constraints, thereby obtaining the influence of different boundary constraints on the fire resistance performance of reinforced concrete slabs, which belongs to construction Technical field of structural disaster prevention and mitigation. Background technique [0002] With the rapid development of my country's economy, people's living standards and quality have been greatly improved. In recent years, a large number of high-rise buildings have emerged in China. Once a building catches fire, it will cause huge losses to people's lives and property. [0003] The fire resistance rating of building components is mainly measured according to the standard fire resistance test, that is, under the specified temperature rise conditions, pressure conditions, loading condition...

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Problems solved by technology

[0006] When studying the fire behavior and fire resistance performance of floors, if the influence of the force generated by the mutual restraint of adjacent floors in the structure on the research results is not considered, it may lead to the internal force, deformation and fire resistance of floors obtained through tests in some cases. The actual structural components are quite different, so that the boundary conditions are inconsistent with the actual structural components, and cannot fully reflect the fire behavior of the overall structure. Therefore, it is important to study the fire resistance and failure modes of reinforced concrete slabs under boundary constraints in fires. significance

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