大跨直立混凝土斜拉桥体系动力性能分析

大跨直立混凝土斜拉桥以其开阔的桥面视野、优美的造型被我国诸多市政桥梁工程所采用,然而,相比普通大跨钢斜拉桥,该类桥梁存在上部结构自重大以及横向稳定性的问题。本文以采用该造型的某实例桥梁工程为背景,考虑了塔梁连接方式的不同：固结体系、漂浮体系、弹性约束体系。分别研究了桥梁采用不同模型时的动力特性,分析结果表明,固结体系的动力特性表现不如漂浮体系和弹性约束体系,且在地震作用下更容易损伤。尽管漂浮体系和弹性约束体系在地震作用下会产生较大位移,但结构内力得到很大程序的减小。因此,后两种体系更加适用于该类斜拉桥。

Dynamic Characteristics Analysis of Vertical Long-span Concrete Cable-stayed Bridge

Vertical long-span concrete cable-stayed bridge with its open bridge view, beautiful modelling is used by many municipal bridge construction in China. However, compared to common large- span steel cable-stayed bridge, erect long-span concrete cable-stayed bridge has lager super structure and lateral stability problems. In this paper, taking a bridge of this kind for example, consider the different way of connection between towers： consolidation system, floating system, elastic restraint system. The study results of dynamic performance of the bridge with different models show that dynamic performance of consolidation system is worse than floating system and elastic restraint system, and damage more easily under the action of earthquake. Although floating system and elastic restraint system under earthquake action will produce a larger displacement, but the structure internal force is greatly reduced. Therefore, the latter two systems are more suitable for this kind of cable-stayed bridge.