本文通过对承受竖向均布荷载的悬链线组拼无铰拱的分析，利用能量原理，建立了组拼拱的横向稳定屈曲临界荷载的计算公式。

Catenary assembled single rib arch that carries vertical loadings and was analyzed in this paper, calculation formula of critical loading of lateral stability flexuosity by the energy principle.

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根据正交拱涵和斜交拱涵的工后开裂情况，对无铰拱涵裂纹产生的原因进一步分析并提出预防措施。

By cracks of square and oblique arch culverts after completion, the paper further analyzes the reasons for crack of non-articulated arch culvert, proposes the preventing measures.

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试验证明该理论可行并能用于研究无铰旋翼结构参数对桨叶气弹稳定性的影响，也能用于直升机旋翼的型号设计。

The experimental results verify that the feasible theory can be used to investigate the effects of structural parameters of hingeless rotor on aeroelastic stability.

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