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本文将连续拱桥的简图近似为析线形的杆系,在刚度分布未确知的情况下,可根据此几何约束体系最不利的可能变形状态,估定连续二铰拱桥桥墩地震力的上限值。文中初步研究了跨数、拱形、拱-墩重量比和墩高等参数变化的影响,并草拟了计算桥墩地震力的简单公式的雏形。自振频率的简便确定方法还有待研究。文末对连续无铰拱桥情形也作了简单讨论。
In this paper, the simplified diagram of continuous arch bridge is approximated as a linear system of linear lines. Under the condition that the stiffness distribution is not known, the upper limit of the seismic force of continuous two-hinge arch bridge piers can be estimated according to the most unfavorable possible deformation state of this geometric constraint system. value. In this paper, the influences of parameters such as the number of spans, arches, weight ratios of arch-to-piers, and piers and higher parameters are studied preliminarily, and a simple formula for calculating the seismic forces of bridge piers is drafted. The simple method of determining the natural vibration frequency remains to be studied. At the end of the paper, we also briefly discussed the case of continuous hingeless arch bridges.