ABSTRACT

Long-span bridges suspended from floating towers are a promising design concept to cross the strait with deep water depth. This paper presents an alternative dynamic simulation framework for floating suspension bridge by integrating the calculations of wave, radiation and wind loads with common software and computing scripts, and verifies the numerical models, including structure, wave load, radiation and wind load. Bridge schemes with different sag-to-span ratios inspired by a prototype long-span floating bridge were proposed. Static, modal and dynamic analyses are conducted through the developed simulation framework to obtain the bridge response. The influence of the sag-to-span ratio on the dynamic response of a long-span bridge suspended from floating towers under wave and wind conditions was investigated. The results indicate that the natural period of the floating bridge decreases with the reduction in the sag-to-span ratio, and the sag-to-span ratio significantly affects the dynamic response of the example floating bridge.

摘要

悬吊在浮塔上的大跨度桥梁是一种很有前途的设计理念，可以在深水区穿越海峡。本文通过将波浪、辐射和风荷载的计算与通用软件和计算脚本相结合，提出了一种替代的浮式悬索桥动力模拟框架，并对包括结构、波浪荷载、辐射和风荷载在内的数值模型进行了验证。受原型大跨度浮桥启发，提出了具有不同垂跨比的桥梁方案。通过开发的仿真框架进行静态、模态和动态分析，以获得桥梁响应。研究了在波浪和风力条件下，垂跨比对悬吊式大跨度桥梁动力响应的影响。