Concrete creep effect analysis method

An analysis method and concrete technology, applied in special data processing applications, instruments, geometric CAD, etc., can solve the problems of poor calculation accuracy and long calculation time, and achieve the effects of poor calculation accuracy, long calculation time and simplified calculation

Inactive Publication Date: 2017-05-31
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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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 pro

Method used

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Embodiment

[0084] The concrete creep effect analysis method includes the following steps:

[0085] Step a: Determining the concrete stress value σ(t) varying with time t;

[0086] Step b: According to the concrete stress value σ(t) measured in step 1, make its change curve with time t, such as figure 1 shown;

[0087] Step c: Use the recursive method to obtain the creep strain increment

[0088] Step d: According to the stress relaxation coefficient R(t,τ)=σ(t) / σ 0 , the graph of concrete stress versus time in step b and step c, setting the concrete τ 0 The stress value at time σ 0 =1, the calculation formula of the stress relaxation coefficient R(t,τ) changing with time t is obtained, and the formula of the calculation formula is:

[0089]

[0090] In the formula, σ(t) is the stress of concrete at time t;

[0091] σ 0 is the concrete τ 0 the stress applied at all times;

[0092] Δσ n is the stress increment applied to concrete in a certain period of time;

[0093] E(τ n...

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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...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/23
Inventor 陈思孝陈克坚陈天地李锐张亮亮
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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