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本文导出了有拉杆抛物线二铰拱在其自身平面内的临界荷载表达式，揭示了临界荷载随拉杆柔度变化的规律．
In this paper, the expression of the critical load of the parabolic two-hinged arch in its own plane is derived, and the law of the change of the critical load with the compliance of the tie rod is revealed.