Fatigue bending machine for concrete material

Abstract

The invention relates to a fatigue bending machine for a concrete material. A loading main body is fixed in an outer frame and driven by a power mechanism; and the fatigue loading of a concrete sampleis realized by vertical component force of inertia force generated by the loading main body. The outer frame is provided with screws arranged on two sides of the outer frame and the screws pass through two ends of a rigid cross beam and are fixed by nuts; and the rigid cross beam is connected with the loading main body through a tension spring. A rotating shaft of the loading main body is arranged at a crossing point of an X-shaped frame and the lower part of the rotating shaft is connected with a mass block. A rolling pulley is arranged at the end part of the X-shaped frame and a guide railfor the pulley to roll is arranged at the corresponding position of the outer frame. A digital display screen and a contactor which are controlled by a display screen are connected with a power mechanism through leads and controlled by a switch to open and close a motor. The invention takes the vertical component force of inertia force generated by the rotation of the mass block as a circular load, thus the test cost is reduced. In addition, the outer frame is coated with rustproof liquid, the loading main body and the guide rail of the outer frame is treated by a blackening process and is subject to rustproof treatment, so that the loading of the device in an environment box is realized.

Description

Technical field [0001] The invention belongs to the field of civil engineering, and specifically relates to a loading tool for applying fatigue loads, in particular to a testing machine provided for studying the durability of concrete materials under fatigue loads. Background technique [0002] The durability of concrete has become a hot spot in the study of concrete structures in the world today. Concrete bridges work under vehicle load for a long time, but also accept the influence of external environmental effects, such as carbonization, chloride erosion and so on. When the depth of concrete carbonization or chloride salt corrosion reaches the surface of the steel bar, under the action of water and oxygen, the steel bar is corroded, and the concrete structure reaches its durability limit. Accurate prediction of structural durability life is a difficult problem in current durability research. To achieve this goal, it is necessary to establish corresponding test technology. [0...

AI Technical Summary

Problems solved by technology

Most of the existing fatigue loading devices are hydraulic servo fatigue testing machines, which have large loading force and are easy to control, but there are still two problems in terms of durability: one is the artificial climate environment simulation box for the rust prevention of the parts of the fatigue testing machine. The requirements are high, and the hydraulic fatigue testing machine is expensive, and it is uneconomical and not reliable enough to test the durability of concrete under the coupled action of the environment and fatigue load; the second is that the environmental chamber is relatively small, and the existing hydraulic fatigue testing machine takes up a lot of space , it is still difficult to work together with the environmental chamber

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