|Table of Contents|

Mechanical property of segmental tower of cable-stayed bridge(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2016年05期
Page:
17-29
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Mechanical property of segmental tower of cable-stayed bridge
Author(s):
CHEN Kang-ming;  WU Qing-xiong;  HUANG Han-hui
School of Civil Engineering, Fuzhou University, Fuzhou 350116, Fujian, China
Keywords:
bridge engineering;  main tower of cable-stayed bridge;  reducing scale-model experiment;  nonlinear finite element;  strength reduction coefficient;  local buckling
PACS:
U443.38
DOI:
-
Abstract:
Based on the segmental tower of Waitan Bridge in Ningbo City, the axial compressive loading experiment of 1:3.34 scaled-model was conducted by using the prestressed steel strand self-balanced loading mode, and the force transferring route, mechanical characteristics, actual bearing capacity and local instability mechanism of segmental tower for cable-stayed bridge were studied by using finite element method and considering initial imperfections and local buckling. Analysis result shows that the external loads are mainly carried by the plates of two outer boxes, the stresses of the plates of outer and inner box increase and decrease from the sections closing to the abrupt changing section, the external load of inner box gradually transmits to outer box, and the maximum stresses of stiffened plates appear on the abrupt changing sections. The measurement points can be categorized into three kinds according to the relationship between the measured and sectional average stresses, including the points under axial compression and compression-flexure along the insider and outsider of steel box. The strength reduction coefficient of segmental tower is larger than 0.90 from the reduced-scale model experiment, and the ultimate bearing capacity of the model obtained by the finite element analysis is 1.06 times of theoretical ultimate bearing capacity. Although the local buckling of stiffened plates can be prevented effectively by using longitudinal stiffeners and diaphragms, the attention should be paid to the design and construction of longitudinal stiffeners near the intersection of top plates, bottom plates and inner web plates of two side boxes, especially the longitudinal stiffeners close to the abrupt changing section, since the abrupt changing section easily leads to the stress concentration, and it is likely to occur local buckling. The stiffened plates of outsider of steel box for the segment model fail to resist larger applied loads due to the local buckling occurring on the abrupt changing section. 2 tabs, 38 figs, 26 refs.

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Last Update: 2016-10-20