Method for establishing stainless steel bar concrete mesoscopic numerical model

Abstract

The invention discloses a method for establishing a stainless steel bar concrete mesoscopic numerical model. The method comprises the following steps: uncertain stainless steel bar concrete mesoscopicstructure composition, model establishment of each mesoscopic structure, constitutive relation of each mesoscopic component and determination of mesoscopic material parameters. Under the condition ofdetermining the mesoscopic material parameters of the coarse aggregate, the mortar, the mortar-coarse aggregate interface and the steel bar-mortar bonding interface, mesoscopic finite element analysis is carried out on the bonding performance of the stainless steel bar concrete. According to the method, based on a mesomechanics theory, detailed expression is carried out from the aspects of mesoscopic structure composition, constitutive relations of all mesoscopic components, determination of mesoscopic parameters, setting of boundary constraints and the like. A simplified method of a stainless steel bar solid structure in two-dimensional solid modeling is proposed, a parameter assignment method of a stainless steel bar-mortar matrix bonding layer microstructure material is studied, the influence of interface performance on bonding strength is analyzed, and the recommended value range of the tensile strength of a bonding layer is determined in combination with a calculation result.

Description

technical field [0001] The invention relates to the field of stainless steel reinforced concrete, in particular to a method for establishing a mesoscopic numerical model of stainless steel reinforced concrete. Background technique [0002] Since the end of the 19th century, reinforced concrete has been widely used in the construction of infrastructure such as hydraulic structures, marine structures, roads and bridges, and is the most widely used building material in engineering construction. Especially in the marine environment and chlorine-salt polluted areas, due to the multi-phase and heterogeneous system composed of reinforced concrete structures, and the promotion of concrete carbonation and corrosion on the corrosion process of steel bars, steel bar corrosion becomes the mechanical performance of reinforced concrete members. main factor of degradation. With the large-scale construction of major infrastructures such as water conservancy and transportation in my country...

AI Technical Summary

Problems solved by technology

[0003] At present, there are relatively few experiments and theoretical studies on the bearing capacity of stainless steel reinforced concrete in China, and it is impossible to form a systematic design theory of stainless steel reinforced concrete, which greatly limits the application of stainless steel reinforced concrete in engineering structures. It is quite different from ordinary carbon steel bars in terms of process performance, durability, etc. It is not clear whether the calculation theory of ordinary reinforced concrete is applicable to stainless steel reinforced concrete. Carry out related research on the bearing capacity of stainless steel reinforced concrete, and explore the bearing capacity of stainless steel reinforced concrete structures. It has a very important prospect to improve the calculation theory of the bearing capacity of stainless steel reinforced concrete structures. However, limited by the development of current test technology and test equipment, it is relatively difficult to reveal the mechanical response mechanism of stainless steel reinforced concrete structures from the inside of concrete materials based on experimental research. complex, but with the rapid development of computer technology, mesoscopic numerical simulation methods based on mesomechanical theory can analyze the fracture and failure process of concrete from the mesoscopic level, and can reveal the relationship between mesoscopic structure and macroscopic mechanical properties. Therefore, The present invention proposes a method for establishing a mesoscopic numerical model of stainless steel reinforced concrete to solve the deficiencies in the prior art

Images