Steel shell and concrete combined structure member thermodynamic coupling loading test device and method

Abstract

The invention relates to a steel shell and concrete combined structure member thermodynamic coupling loading test device and method and belongs to the technical field of safety engineering experiments. The test device comprises a force-bearing frame, a force sensor, a jack, a displacement meter, a thermal insulation cushion block and a test member, wherein multiple thermocouple temperature sensorsare installed inside the test member; on a plane of the test member, the thermocouple temperature sensors are uniformly arranged and are symmetric about a transverse partition plate and a longitudinal partition plate; and in the thickness direction of the test member, the thermocouple temperature sensors are arranged according to a certain gradient. Through the test device and method, mechanicalbehaviors of a steel shell and concrete combined structure under a fire and a high temperature can be obtained, wherein the mechanical behaviors include a member section temperature distribution law under the fire and the high temperature, a member deformation development law, damage evolution characteristics under the action of thermodynamic coupling and the like; and the bearing capacity changeof the steel shell and concrete combined structure under the fire condition can be obtained, and the influences of the fire and the high temperature on the member bearing capacity are assessed by comparing test results of member mechanical characteristics before and after a fire resistance test.

Description

technical field [0001] The invention belongs to the technical field of safety engineering experiments, and relates to a thermal coupling loading test device and method for steel shell concrete composite structural members. Background technique [0002] The structure of the steel-shell immersed tube tunnel is relatively complex, and its outer steel shell has two functions of waterproof and load-bearing at the same time. Therefore, the stability and durability of the steel shell are of great significance to the safety of the overall structure of the tunnel. Due to its large size, ocean and river environment, deep water conditions, etc., once a fire occurs in a submarine immersed tube tunnel, the consequences are often more serious than that of a land transportation tunnel, and the repair is also extremely difficult. With the rise of the construction boom of immersed tube tunnels, strengthening the research on the basic theory of disaster prevention of immersed tube tunnels is ...

AI Technical Summary

Problems solved by technology

The mechanical behavior and functional characteristics of steel-shell concrete composite structures under high-temperature fires lack a research basis. Therefore, according to the working characteristics of steel-shell concrete composite structures, it is of great engineering significance to determine a thermal-mechanical coupling loading test method for steel-shell concrete composite structural members.

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