Loading device for concrete material crack growth test under dynamic load

Abstract

The invention relates to a loading device for a concrete material crack growth test under a dynamic load. An actuation head of a fatigue tester is connected with a wedge loading frame through a vertical force sensor; steel shafts are arranged at two quartiles at the upper part of a concrete sample in a penetrating manner; both ends of each steel shaft are respectively and fixedly provided with a bearing and a horizontal stretching rod; a spring is stretched by adjusting a distance of each horizontal stretching rod at the both sides of the steel shaft, so as to supply horizontal pre-compression to the concrete sample; a dynamical data collector is connected by using vertical and horizontal sensors so as to measure actual tension of the spring at different time; an actual acting force acting on the concrete sample at each time can be calculated by a calculation formula provided according to a working principle; and finally, a load is supplied to the concrete sample. The loading device provided by the invention can supply the tension-compression dynamic load for opening and closing a crack for the concrete sample, so that the loading device can be used for testing a crack growth process of a concrete material under the dynamic load.

Description

technical field [0001] The invention relates to a concrete tension and compression test device, in particular to a compact tension and compression loading device under dynamic load. Background technique [0002] As the infrastructure of the national economy, water conservancy projects play an important role in various aspects such as social and economic development, public safety, and ecological environment, and the buildings that play a key role in retaining water in water conservancy projects are dams. In my country, the dam sites of most of the concrete dams that have been built or are under construction are located in the southwest and northwest regions with frequent seismic activities. For example, the design seismic acceleration of Xiaowan concrete arch dam (292 m high) is 0.308 g, and The design acceleration of the concrete gravity dam site is 0.399 g, and the Dagangshan Arch Dam, which started construction in 2006, has a design peak seismic acceleration of 0.5575 g. ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problem that the existing compact tensile test device cannot apply dynamic load, the present invention designs a compact tension-compression loading device capable of applying dynamic load by improving it

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