Abstract

Pylons of cable-supported bridges are especially important components. They are generally large in scale and bear the main loads of the bridge, involving requirements both in structural performance and aesthetics. In this paper, a new form finding method for the pylon is proposed, with the use of bi-directional evolutionary structural optimization (BESO) method and the application of aesthetic rules. The principle of BESO method and the process for the form finding of the pylon are discussed. Pylons of the Hangrui Dongting Lake Bridge and the 3rd Panama Canal Bridge are used as cases to illustrate the proposed method. These two bridges are a suspension and a cable-stayed bridge with a main span of 1480 m and 530 m, respectively. The Golden-section and the Rectangle-division methods, together with the morphologic feature from local culture, are used to achieve harmony between the bridge and the environment. It is shown that the requirements mentioned above can be more easily achieved with the proposed method as well as some aesthetic rules.

摘要

索桥的塔架是特别重要的组成部分。它们通常规模较大，承担桥梁的主要载荷，涉及结构性能和美学方面的要求。在本文中，使用双向进化结构优化（BESO）方法和美学规则的应用，提出了一种新的塔架找形方法。讨论了BESO法的原理和塔架找形的过程。以航瑞洞庭湖大桥和巴拿马运河三桥的桥塔为例说明所提出的方法。这两座桥为悬索桥和斜拉桥，主跨分别为1480 m和530 m。黄金分割法和矩形分割法，结合当地文化的形态特征，用于实现桥梁与环境之间的和谐。结果表明，使用所提出的方法以及一些美学规则可以更容易地实现上述要求。