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例 5.1 三铰拱及其所受荷载如图所示，拱的轴线为抛物线 。试求支座反力，并绘制内力图。

例 5.1 三铰拱及其所受荷载如图所示，拱的轴线为抛物线 。试求支座反力，并绘制内力图。. 解 （ 1 ）求支座反力. (2) 内力计算（以 x=3m 的截面 E 为例说明） A 、截面 E 的几何参数. B 、截面 E 的内力. 例 5.2 试求图示对称三铰拱在均布荷载作用下 的合理拱轴线. M C 0 = ql 2 /8. H = ql 2 /8 f. M 0 = qlx /2- qx 2 /2 = qx ( l-x )/2. y =4 fx ( l-x )/ l 2. 抛物线. 思 考 题.

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例 5.1 三铰拱及其所受荷载如图所示，拱的轴线为抛物线 。试求支座反力，并绘制内力图。

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  1. 例5.1 三铰拱及其所受荷载如图所示，拱的轴线为抛物线 。试求支座反力，并绘制内力图。

  2. 解（1）求支座反力 (2)内力计算（以x=3m的截面E为例说明） A、截面E的几何参数

  3. B、截面E的内力

  4. 例5.2 试求图示对称三铰拱在均布荷载作用下 的合理拱轴线 MC0=ql2/8 H=ql2/8f M0=qlx/2-qx2 /2 =qx(l-x)/2 y=4fx(l-x)/l2 抛物线

  5. 思 考 题 三铰拱在均匀水压力作用下，三铰拱的合理轴线？ 三铰拱在填土重量作用下，三铰拱的合理轴线？

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