注：H4为推力接盘高度，转矩型无推力接盘。

Note: H4 is the height of thrust attachment, torque mode without this attachment.

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下承式系杆拱桥以系杆承受水平推力，属于无推力的组合体系拱结构。

A through tied-arch bridge is a type of built-up arch structure, characterized by the horizontal thrust of arch end being balanced by its ties.

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在应用这种方法时，利用状态转移矩阵来产生无推力段的约束，减少了数值方法的误差。

When using the method, state transfer matrix is applied to produce the constraints, which can reduce the error from numerical method.

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