Concrete creep effect analysis method

Abstract

The invention relates to the technical field of bridge engineering, in particular to a concrete creep effect analysis method. The method comprises the following steps that 1, a time-dependent concrete stress value sigma (t) is measured; 2, according to the time-dependent concrete stress value sigma (t) measured in the step 1, a time(t)-dependent variation curve graph is obtained; 3, a recurrence method is adopted for obtaining a creep strain increment; 4, according to a stress relaxation coefficient R(t, tau)=sigma(t) / sigma0, the curve graph obtained in the step 2 and the step 3, a stress value sigma 0 of the moment tau 0 of concrete is set to be equal to 1, and a computational formula of a stress relaxation coefficient R(t, tau) at the time t is obtained, wherein the equation of the computational formula is shown in the description; 5, according to the stress relaxation coefficient R(t, tau), a concrete time-dependent elasticity modulus E(t, t0) is obtained; 6, according to the computational formula of the stress relaxation coefficient R(t, tau) and the elasticity modulus E(t, t0), concrete creep effect analysis is completed. According to the analysis method, the stress-strain algebraic equation is adopted, computation is greatly simplified, and programming computational analysis is promoted.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a concrete creep effect analysis method. Background technique [0002] In recent years, my country's railway construction has developed rapidly. During the railway construction process, many railway continuous steel bridges have been newly built. According to the investigation, it is found that the mid-span deflection of the high-pier long-span continuous steel bridge continues to increase several years after the bridge is completed, exceeding the expected value at the time of design, affecting the driving comfort and causing adverse effects on the structure. impact, reducing the durability of the structure, and even leading to bridge failure. Studies have shown that shrinkage and creep are one of the important reasons for the continuous deflection of long-span continuous steel bridges. It has attracted the attention of scholars at home and abroad, but it has not bee...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor calculation accuracy and long calculation time caused by the force method used in the creep effect analysis method of multiple statically indeterminate structures in the prior art, and to solve the problems of the effective modulus method adjusted by age. Use, provide a concrete creep effect analysis method, the analysis method uses the algebraic equation of stress and strain, which greatly simplifies the calculation and is beneficial to the programming calculation analysis

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