Method for establishing dynamic H-B strength criterion of fiber reinforced concrete

Abstract

The invention relates to the technical field of building materials, and provides a method for establishing a dynamic H-B strength criterion of a fiber reinforced concrete. The method is based on a Hooke-Brown (H-B) strength criterion, and by analyzing the change rule of a parameter m of the H-B strength criterion along with the strain rate and the change rule of sigma c along with the strain rate,the HBPRC dynamic H-B strength criterion considering the strain rate effect is established; the relationship between m and sigma c and the compressive strength and tensile strength of the HBPRC is further analyzed, and finally a dynamic H-B strength criterion of the HBPRC related to the pore surface integral dimension of the HBPRC and the mixing amount of BF and PF is established; D1 and D2 are the pore surface integral dimensions of capillary pores and pores of the HBPRC respectively; v1 and V2 respectively represent the doping amounts of BF and PF, and the unit is%; the consistency of the fitting result and the test result is high, the change rule of the strength of the HBPRC along with the strain rate and the confining pressure can be effectively expressed, and the influence of the pore surface integral shape dimension of the HBPRC and the mixing amount of BF and PF on the dynamic mechanical property of the HBPRC can be effectively reflected.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a method for establishing the dynamic H-B strength criterion of fiber reinforced concrete. Background technique [0002] With the continuous development of concrete structures, many concrete structures with various forms and complex stresses have emerged. For these concrete structures, the establishment of concrete material failure criteria is of great significance for the rational design and stability analysis of structures. Based on reasonable mechanical theory or empirical analysis, relevant scholars have established a variety of failure criteria for concrete materials, such as the Hooke-Brown (H-B) strength criterion, octahedral strength criterion, and power-law strength criterion. At present, although many strength criteria are used to calculate the strength variation law of quasi-brittle materials such as concrete and rock under complex stress conditions, due to...

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Problems solved by technology

Therefore, due to the good impact resistance of HBPRC, when it is applied to engineering structures that are prone to explosion and impact loads, the existing research results are still difficult to provide an effective theoretical basis for the rational dynamic design of engineering structures

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