【摘要】 以某钢管混凝土斜靠式拱桥为研究对象,基于Lyapunov运动稳定性原理,给出斜靠式拱桥的动力稳定性判断准则.通过地震时程响应和屈曲分析,绘制斜靠式拱桥在顺桥向、横桥向及竖向地震激励下的动力特征值时程曲线,描述斜靠式拱桥的动力失稳模态,揭示地震输入方向及稳定拱肋倾角对斜靠式拱桥动力稳定性的影响规律.研究表明,地震荷载作用下斜靠式拱桥动力稳定性的最不利激励方向为竖向;随着稳定拱肋倾角的增大,斜靠式拱桥的侧向刚度显著提高,动力稳定系数基本呈增大趋势.更多还原

【Abstract】 The criteria of dynamic stability of leaning-type arch bridge were worked out on the basis of the Lyapunov theory of motion stability. The dynamic characteristic time-history curves and dynamic buckling modes were presented under the seismic exercitation in longitudinal,transverse and vertical direction of the bridge by means of seismic time history buckling analysis. The influence of variation of the angle of inclined arch rib on dynamic stability was also studied. The results show that vertical direction is the worst seismic exercitation direction of leaning-type arch bridge for the dynamic stability,stiffness of arch ribs in transverse direction can improve efficiently and the coefficient of dynamic stability of the bridge can increase gradually with the increase of inclined angle of stability arch rib.更多还原