某矮塔斜拉桥0号梁段空间应力分析

Spatial stress analysis of segment No.0 of an extradosed cable-stayed bridge

某秋浦河大桥主桥为矮塔斜拉桥。因0号梁段的构造和受力较为复杂,保证它的质量与受力安全非常重要。文章基于静力等效原理提出一种简化建模方法,并采用通用有限元软件建立了0号梁段的局部计算模型,分析该部位的空间应力传递和分布特点。通过计算分析可知,0号梁段除局部外,整体以受压为主,工程中应充分注意塔下梁段、支座处混凝土的竖向承压设计及塔梁交接处、支座处混凝土的局部抗裂设计。

The main bridge of Qiupu River Bridge is an extradosed cable-stayed bridge. It is impor- tant to ensure the quality and stress safety of segment No. 0 because of its complex structure and stress state. In this paper, a simplified modeling methodology is given based on the equivalent static loading principle and the local calculation model of the No. 0 segment is established by applying the fi- nite element software to analyze the spatial stress transmission and distribution characteristics of this segment. The calculation results show that the No. 0 segment is under pressure on the whole except for some local sections. So, as the engineering is concerned, the vertical compression design of tower beam sections and bearing concrete is very important, so is the local anti-crack design of the junction of tower and beam and bearing concrete.