Concrete absolute stress measurement device and method

Abstract

The invention provides a concrete absolute stress measurement device and method. The concrete absolute stress measurement device comprises a first stainless steel tube and a second stainless steel tube, wherein an end opening A and an end opening B of the first stainless steel tube are both openings, the second stainless steel tube is vertically arranged on the side surface, close to the end opening B, of the first stainless steel tube, an end opening C of the second stainless steel tube is an opening and communicated with the first stainless steel tube, and an end opening D of the second stainless steel tube is sealed; a first ultrasonic receiving probe is arranged in the first stainless steel tube and close to the end opening A, and an ultrasonic transmitting probe is arranged above the end opening C; a second ultrasonic receiving probe is arranged in the second stainless steel tube and close to the end opening D. Through the method, the internal real stress state of a concrete structure can be accurately and integrally measured, the measurement operation is simple and quickly, and nondestructive measurement can be realized. The concrete absolute stress measurement device is simple in structure, low in manufacturing cost, high in practicability and simple and convenient to use.

Description

technical field [0001] The invention relates to the field of concrete stress measurement, in particular to a measuring device and method for concrete absolute stress. Background technique [0002] Concrete is a very complex composite material. Usually, the mortar composed of cement gel and sand is regarded as a uniform and isotropic continuous medium, while concrete is regarded as a two-phase composite material composed of mortar and aggregate. According to the concrete stress-strain curve, under low stress state, concrete exhibits certain linear elasticity, while under high stress, it exhibits obvious nonlinearity. Acoustoelasticity theory shows that the ultrasonic wave velocity is a phenomenon related to the stress state, whether it exists in the elastic range or in the nonlinear stress-strain range. [0003] At present, the research on the acoustic properties of concrete at home and abroad mainly focuses on the zero stress state, but due to the complexity of the concrete...

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Problems solved by technology

[0003] At present, the research on the acoustic properties of concrete at home and abroad mainly focuses on the zero stress state, but due to the complexity of the concrete itself, there are not many studies on the acoustic properties under the loaded state.

At present, there are not many methods for measuring the stress of concrete structures. There are surface measurements by arranging strain gauges on the surface, and there are also methods such as embedding vibrating wire sensors inside the structure. However, no matter which measurement method is used, it cannot be accurate. , fully reflect the real stress state inside the concrete structure

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