Method for inverting mass concrete material parameters

Abstract

The invention discloses a method for inverting mass concrete material parameters. The method comprises the following steps: (1) simulating a real mass concrete temperature process according to the collected concrete temperature process and displacement process of actual engineering; (2) performing a concrete constraint stress test on concrete under a temperature control condition to obtain a constraint stress measurement value; (3) establishing a finite element analysis calculation model consistent with the size of concrete temperature stress test equipment, and inputting concrete material parameters; (4) calculating a concrete constraint stress theoretical value; (5) checking the difference between the concrete constraint stress theoretical value and the measurement value; and (6) judgingwhether the difference is smaller than or equal to a set value or not, if the difference is smaller than or equal to the set value, determining that the input mass concrete material parameters can truly reflect the state of the actually poured mass concrete and serve as various real material parameters of the mass concrete, and otherwise, adjusting the various input material parameters of the concrete until the difference meets the requirements.

Description

technical field [0001] The present invention relates to a method for reversing the material parameters of mass concrete. Specifically, the present invention relates to a method for combining the indoor concrete constraint stress test reflecting the real working state of mass concrete with the inversion large Combining with the numerical calculation model of volumetric concrete material parameters, the method of inverting mass concrete material parameters is analyzed. Background technique [0002] As we all know, concrete will produce various deformations after pouring, such as autogenous volume deformation due to hydration reaction, temperature deformation due to hydration heat, and drying deformation due to water loss, etc. Once these deformations are constrained by the external structure, Concrete will produce non-negligible restraint stress (tensile stress). Due to the multi-phase characteristics of the concrete material itself, concrete will crack when the restraint str...

AI Technical Summary

Problems solved by technology

At present, the concrete material parameters used in numerical simulation calculations to evaluate the cracking risk of mass concrete are all derived from the constant temperature curing test in the laboratory. There are large differences, which will inevitably affect the accuracy of the assessment of the cracking risk of mass concrete

[0007] 2. Ignoring the actual pouring of large-volume concrete and the working / stress behavior of concrete in the design stage

[0008] Another shortcoming of the current numerical simulation calculations for evaluating the cracking risk of mass concrete is that it ignores the material properties of the actual pouring concrete under the real stress state

[0009] In short, since the concrete material parameters tested in the laboratory do not truly reflect the current mass concrete material parameters, and then calculate and evaluate the cracking risk of mass concrete based on inaccurate concrete material parameters, its accuracy will inevitably be greatly reduced

Images