南京长江二桥南汊桥斜拉索塔节段足尺模型的研究

STUDY ON THE FULL SCALE SEGMENTAL MODEL OF TOWER OF CABLE STAYED BRIDGE OF THE SECOND YANGTZE RIVER BRIDGE IN NANJING

斜拉索塔的拉索锚固区是斜拉桥的关键部位，其受力相当复杂，一般的平面分析很难反映实际的应力分布。本文简要介绍了南京长江第二大桥首次采用在箱型截面内布设小半径大吨位的环向U型预应力体系的斜拉索塔节段足尺模型试验研究的主要方案、方法，给出了在预加应力阶段及混凝土开裂前索塔节段足尺模型的试验测试值和有限元空间分析值，结果表明吻合较好。文中还在最后给出了模型结构的开裂荷载和极限荷载，并对设计提出了若干建议。

The anchorage zone of cable stayed bridge tower is the key part of cable stayed bridge, in which stress distribution is rather complicated. A general plane analysis method is hard to reflect actual stress status. In this paper, the main project and method of experimetal study of the full scale segmental model of cable stayed bridge tower of the 2nd Yangtze River Bridge in Nanjing are described, in which the small radius and large tonnage ring U-shape prestressed system is firstly used in the box tower. The test results and FEM spatial analysis valare of the full scale segmental model of tower in the stage of prestressing force and the period before concrete cracking are given. They are in a good agreement . Cracking load and ultimate load of the full sacale segmental model of tower are also given. Some suggestions on design of the bridge tower are proposed .