不同无索区长度下独塔斜拉桥静力性能的有限元分析

Finite element analysis on static properties of a single-tower cable-stayed bridge under different lengths without cable

无索区长度对桥梁受力性能的影响显著,适宜的无索区长度能够优化桥梁整体结构的受力,因此长度的选取在桥梁设计中尤为重要。本文以湘西某跨径为(196+101+62)m的独塔斜拉桥为工程背景,利用有限元分析软件Midas civil建立分析模型,对塔根处和梁端处的无索区长度进行单因素分析。结果表明:塔根处及梁端处无索区长度的变化对主跨主梁挠度,边跨主梁挠度等影响显著,而对斜拉索最大拉力的影响较小。本文成果可为斜拉桥总体设计提供一定的借鉴与参考。

The length without cable has a significant effect on the mechanical properties of the bridge,and the appropriate length without cable can optimize the force of the overall structure of the bridge,so the length selection is particularly important in the bridge design.A single-tower cable-stayed bridge with a span diameter of(196+101+62)m in the western Hunan is taken as the engineering background,and the finite element analysis software Midas civil is used to establish an analysis model,and the length without cable at the root of the tower and the end of the beam is analyzed by single factor.The results show that the change of the length without cable at the root of the tower and the end of the beam has a significant effect on the deflection of the main beam of the main span and the deflection of the main beam of the side span,but has little influence on the maximum tensile force of the stay cable.The results can provide a certain reference for overall design of cable-stayed bridge.