Test device and method for tensile modulus of concrete under high strain rate

Abstract

The invention discloses a test device and method for a concrete tensile modulus under a high strain rate. A shaping sheet and a split pull end are additionally arranged in the device, so that the problem of a dynamic split tensile test method can be solved. Specifically, the shaping sheet is additionally arranged at the end of an incidence rod; the shaping sheet is arranged for guaranteeing that an impact force acting on a test piece is not influenced by a secondary reflection stress wave, and meanwhile, the loading strain rate is basically stable and the load can be conveniently calculated; a rigid gasket and a rigid lining rod which are used cooperatively are symmetrically placed on the contact positions of the test piece and the incidence rod and a transmission rod; the rigid gasket and the rigid lining rod are arranged for guaranteeing that the load can all act on two end points of a disc when the test piece is impacted by the load, so that a test method for the concrete tensile modulus under the high strain rate with convenience, simple test and high success rate can be established.

Description

technical field [0001] The invention belongs to the technical field of impact dynamics, and in particular relates to a test device and method for tensile modulus of concrete under high strain rate. Background technique [0002] Concrete is a heterogeneous, anisotropic material. Therefore, its tensile modulus is different from its compressive modulus. At the same time, concrete is rate-sensitive. Many large-scale concrete structural projects are not only subjected to variable static loads, but also to various violent dynamic loads. The mechanical properties of concrete under dynamic conditions are significantly different from those under static conditions. . [0003] In order to better evaluate the dynamic tensile mechanical properties of concrete, it is necessary to clarify the elastic modulus of concrete at high strain rates. At present, there is no more convenient way to measure the tensile modulus of concrete under dynamic conditions, except for direct tensile tests. ...

AI Technical Summary

Problems solved by technology

However, the success rate of dynamic direct tensile test of concrete is low and the test period is long; the split tensile test is relatively simple and has a high success rate, but the existing split tensile calculation methods mainly focus on static experiments, and the dynamic split tensile test method has the following problems : The stress wave of the dynamic test is affected by the different contact surface media, and it is difficult to calculate the impact force after the stress wave is reflected multiple times; Tensile modulus under stretching condition

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