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首页> 外文期刊>Journal of bridge engineering >Geometrical Nonlinearity and Length of External Tendons
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Geometrical Nonlinearity and Length of External Tendons

机译：几何非线性和外部筋的长度

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External prestressing is achieving widespread success. However, some practical rules are not yet well established. An important question deals with the maximum distance between anchorages and deviators. Due to the absence of contact between the tendons and the concrete beam (other than at the anchorages and deviators), the change in the deformed shape of the concrete beam involves changes in the position of the tendons with respect to the center of gravity of the concrete beam (second-order effects), so that their influence on the equilibrium conditions of the beam near collapse can be significant. This paper suggests a simple equation that determines the maximum clear length of the tendons small enough not to take into account the second-order effects in common practice. A parametric analysis (made by means of a numerical method previously verified by comparisons with experimental test results) verifies the reliability of the simple equation suggested.
机译：外部预应力正在取得广泛的成功。但是，一些实际规则尚未很好地建立。一个重要的问题涉及锚点和偏斜器之间的最大距离。由于在钢筋束和混凝土梁之间没有接触（除了在锚固和偏斜处），混凝土梁变形形状的变化涉及钢筋束相对于钢筋混凝土重心位置的变化。混凝土梁（二阶效应），因此它们对坍塌附近的梁平衡条件的影响可能很大。本文提出了一个简单的方程式，该方程式确定了腱的最大净长度，该长度足够小，以至于不考虑普通实践中的二阶效应。参数分析（通过事先与实验测试结果进行比较验证的数值方法进行）验证了所建议的简单方程的可靠性。

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