独柱双支承曲线梁式桥抗倾覆性能研究

Research on Anti-overturning Performance of Single-column Double-supported Curved Girder Bridge

本文通过建立足尺数值分析模型,结合整体倾覆破坏及变形体转动破坏机理,研究了不同支承形式、向心侧和离心侧极限倾覆位移、极限倾覆位移不同位置对曲线梁式桥支座反力及弯矩分布的影响。研究表明:(1)对于独柱墩双支承而言,大量级偏载车辆作用于向心侧的桥跨数目越多,桥墩各支座的支反力越大;大量级偏载车辆作用于离心侧的桥跨数目越多,桥墩各支座的支反力先降低后增大;(2)相比于独柱单支承,独柱双支承在面对整体倾覆破坏时具有良好结构响应性能,支座反力降低效果幅度为11.68%至22.55%,因此面对易发生整体倾覆破坏的桥段设置独柱双支承较为合适;(3)变形体发生转动破坏时,独柱单支承与独柱双支承的承载性能仅相差约7%;(4)横向比较大量级偏载车辆作用于向心侧与离心侧可发现,同等数量级的大量级偏载作用于离心侧时,离心侧支座的支反力波动幅度较大,需引起足够重视。

In this paper,through the establishment of a full-scale numerical analysis model,combined with the overall overturning failure and the deformation mechanism of the deformation body rotation failure mechanism,different support forms,the centripetal side and the centrifugal side limit overturning displacement,the limit overturning displacement at different positions on the curved beam bridge support reaction force and bending the influence of moment distribution.The research shows that:(1)For single-pillar piers and double supports,the larger the number of eccentrically loaded vehicles acting on the centripetal side of the bridge span,the greater the supporting reaction force of each support of the pier;The more the number of bridge spans on the centrifugal side,the reaction force of each support of the pier decreases first and then increases;(2)Compared with single-column single-support,single-column double-support has good structural response performance in the face of overall overturning failure,The support reaction force reduction effect range is 11.68%to 22.55%,so it is more appropriate to set up single-column and double-support for bridge sections that are prone to overall overturning failure;(3)When the deformed body is rotated and damaged,single-column and single-support and independent The load-bearing performance of the column double support differs only by about 7%;(4)Lateral comparison of a large number of eccentric loads on the centrifugal side and the centrifugal side can be found.When a large number of eccentric loads of the same order of magnitude act on the centrifugal side,the centrifugal side support the reaction force fluctuates greatly,which needs to be paid enough attention.