Microscopic Homogenization of Steel Fiber Lightweight Aggregate Concrete and Ultimate Bearing Capacity of Torsion Components

Abstract

Abstract: Due to the advantages of light weight and excellent heat resistance, steel fiber lightweight aggregate concrete (SFLWC) is increasingly used in civil engineering. Considering the SFLWC is a multiphase composite material in nature, and the mechanical performance test results are highly discrete and the test is time-consuming and labor-intensive, the application of microscopic homogenization theory to predict its mechanical properties is considered to be one of the effective methods. Based on the Mori-Tanaka homogenization theory, this paper predicted the elastic modulus of steel fiber lightweight aggregate concrete when the steel fiber volume content is 0%, 0.5%, 1%, and 1.5%. And on that basis, it carried out torsion finite element calculations on steel fiber lightweight aggregate concrete beams, and proposed amendments to the empirical calculation formula for the ultimate bearing capacity of torsion components. The results show that the predicted value of elastic modulus obtained by the homogenization theory had little error with the calculation result of the empirical formula in the specification, and it is in good agreement with the test results. The torsion curve of steel fiber lightweight aggregate concrete beam obtained by finite element calculation accorded with the relevant test results to a high degree. The calculation and correction formula of the limit torque proposed in this paper is relatively consistent with the test results. Therefore, the proposed correction formula has been verified to be of certain practical reference value for engineering calculation and application.

Key words: steel fiber lightweight aggregate concrete, Mori-Tanaka homogenization theory, finite element analysis, fiber volume fraction, ultimate torque

CLC Number:

TU528

WANG Huiming, HE Zhengbo, ZHU Wen. Microscopic Homogenization of Steel Fiber Lightweight Aggregate Concrete and Ultimate Bearing Capacity of Torsion Components[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3376-3384.

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