The lateral buckling of single-plane continuous beam parabolic arch hybrid bridge subjected to a uniform vertical load is investigated.Based on energy principle,a practical formula is devised and also the influence coefficient of side span is proposed for the first time.The proposed practical formula is verified by comparing the analytical solutions with the finite element results.It is concluded that the simple and accurate practical formula proposed by taking into account the effects of comprehensive aspects can provide references and assistance for a better design of the similar type bridge.Moreover, a detailed parametric study shows that the side span has significant effect on the lateral stability and increasing the length of side span can further enhance the lateral stability within a reasonable side-main-span ratio.%研究了单承载面连续梁抛物线拱组合体系桥在竖向均匀荷载作用下的侧倾屈曲问题，首次用能量法推导了连续梁拱组合体系桥侧倾稳定计算的实用公式，并提出了边跨效应影响系数。将公式计算结果与有限元结果进行对比，验证了实用计算公式的正确性。研究结果表明：提出的实用计算公式比较全面地考虑了影响连续梁拱组合体系桥侧倾稳定的因素，具有足够的精确性，使用简洁方便，对同类桥型的初步设计有很大的指导意义；同时表明边跨有利于桥梁结构的稳定，且在合理的边中跨比范围内增大边跨可进一步提高桥梁结构的侧倾稳定性。
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