Theoretical research and earthquake damage investigation indicate that there is bend torsion coupling vibration for curved bridge when earthquake occurs.

理论研究与震害经验表明，地震时曲线桥梁会产生弯扭耦合振动。

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Hold tube bend in position, Fig. 5, and mark tube on level with top of hex on compression coupling. Cut off tube at this mark.

将管子弯头握住在位置上，图5，在压紧联轴节上六角顶部标注管道水平位置。

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Finally, the linear eccentricity is adopted in designing in order to reduce the coupling of bend and wring which exist in the curved bridge.

最后，为减小曲线梁桥存在的弯扭耦合作用，设计中通过设置偏心距来调整。

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