Abstract
The damage variables of describing the material damage state should be chosen first when the research of concrete structures by use of theory of damage theory. The method of calculation of damage parameter by the measure of the change of the elastic modulus of concrete specimens is effectively. In this paper, the wedge splitting tests with double bearing of three groups of different initial crack lengths of concrete specimens were conducted, and the stress and the strain of the points with different distance from the initial crack tip measured and calculated, and the damage value with peak stress of the various points were calculated based on the stress-strain curves. From the results of the test, the damage parameter can be confirmed under the non-uniform stress field, and the initial crack length has some influence on the damage parameter, and the longer the initial crack length and the greater the damage parameter.
Highlights
Concrete is one of the main materials of buildings such as the traffic, civil, hydraulic, etc
From the results of the test, the damage parameter can be confirmed under the non-uniform stress field, and the initial crack length has some influence on the damage parameter, and the longer the initial crack length and the greater the damage parameter
The damage in the region of the closer distance to the tip of the pre-crack is more obvious during the failure process of the specimens, and in the non-uniform stress field, the damage value corresponding to the peak stress may be related to the stress gradient of the stress field
Summary
Concrete is one of the main materials of buildings such as the traffic, civil, hydraulic, etc Because it is a multiphase particulate composite, during the process of pouring and molding, a variety of defects in concrete could not be avoided. The interfaces are relatively weak, and micro cracks may occur here [1] These defects and micro cracks may be discontinuous and random, but when a concrete structure is subjected to the external loads, temperature changes, chemicals and so on, these micro cracks and defects may develop and some new micro-cracks will appear, through the collection, connectivity and result in macro cracks. From the point of view of damage mechanics, initial defects and micro-cracks is a type of damage, the germination and propagation of cracks are the process of the accumulation of damage. From the test results can be seen, damage parameters can be determined in non-uniform stress field, and the initial crack length have a certain extent influence on the damage parameters, the longer the initial crack length the greater the damage value
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