欧洲标准4组合梁徐变因子的计算分析

彭祖强; 陈旭; 毛德均; 余文正; 吴克川

doi:10.13204/j.gyjz202004025

欧洲标准4组合梁徐变因子的计算分析

doi: 10.13204/j.gyjz202004025

1. 昆明学院建筑工程学院, 昆明 650214;
2. 昆明学院基建处, 昆明 650214

基金项目:

国家自然科学基金项目（51868034）；昆明学院科研项目（XJZZ17011）。

详细信息

作者简介:
彭祖强,男,1970年出生,硕士,讲师。电子信箱:xuchen_22@163.com

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- 文章访问数: 45
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- 被引次数: 0
出版历程
- 收稿日期: 2019-10-19

CALCULATION AND ANALYSIS OF CREEP MULTIPLIER OF COMPOSITE BEAMS IN EUROCODE 4

1. School of Urban and Rural Construction and Engineering Management, Kunming University, Kunming 650214, China;
2. Infrastructure Department, Kunming University, Kunming 650214, China

摘要

摘要: 欧洲标准4（EN 1994-2）将徐变不利影响表示为混凝土弹性模量的折减系数，该系数是用定值徐变因子和徐变系数表示的时间的函数。但定值徐变因子不能反映钢梁高度等重要参数，有必要推导解析算式作为补充。基于徐变微分本构方程，在合理简化基础上推导轴压徐变因子和弯曲徐变因子的算式，分别用于换算混凝土等效钢的面积和惯性矩。通过微分方程组的电算解验证，这两个算式可行。对钢梁高度进行参数分析，结果表明：EN 1994-2的折减系数符合组合梁挠曲刚度随时间增长而降低的规律，但会低估各种不利影响，而且随着钢梁高度的增加偏差加大。
- 钢-混凝土组合梁 /
- 轴压徐变因子 /
- 弯曲徐变因子 /
- 应力 /
- 挠度
Abstract: In Eurocode 4, adverse effects of creep are expressed as the reduction factor of concrete elastic modulus, which is the function of time including a constant creep multiplier and creep coefficient. However, the constant creep multiplier can not reflect important factors such as the beam height, it is necessary to derive analytical formula as a supplement. Based on Dischinger creep differential constitutive equation, formulas of axial creep multiplier and bending creep multiplier were derived after a reasonable simplification, which could be used to transform the area and moment of inertia of concrete into those of the equivalent steel respectively. Through the computer solution of differential equations, the two formulas were verified. Parameter analysis was carried out on the beam height, the results showed that reduction factor in Eurocode 4 was recommended for the conformity with the time-dependent law of composite beams, but it underestimated the adverse impact and the errors increased with the increased of steel beam height.
- steel-concrete composite beam /
- axial creep multipier /
- bending creep multipier /
- stress /
- deflection

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参考文献(11)

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