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Abstract

The main bridge of Qingshui River Bridge is a (65+5×120+65) m continuous rigid frame bridge. The main girder adopts a combination of corrugated steel webs and concrete box girders, with double-amplitude single-box single-chamber sections. The corrugated steel webs adopt 1600 type corrugated steel plates, and are connected to the top and bottom plates respectively with double PBL shear keys and ∟200 angle steel. Longitudinal prestressed steel bars are divided into internal tendons and external tendons. The lower structure adopts double thin-walled hollow piers, bearing platforms, and bored pile foundations, with a maximum pier height of 73 m and an average pier height of 71.4 m. The main bridge adopts a cantilever cast-in-place construction scheme, and the closure sequence is respectively the edge span, central span, secondary central span, and secondary side span. The closure temperature is 10℃, and the jacking force is 500 kN for the central span, 800 kN for the secondary central span, and 1200 kN for the secondary side span. Additionally, Ansys 14.0 was adopted to analyze the torsional cross slope and warping ratio of the central span section, which reveals that the arrangement of six diaphragms is more reasonable. By comparing the most unfavorable eccentric load and symmetrical load conditions, the live load eccentric load coefficient of the corrugated steel web under stress is determined to be 1.3. Additionally, Midas/Civil 2019 was employed for longitudinal static calculation during construction and bridge completion stages, shear yielding and flexure calculation of corrugated steel webs, shear strength calculation of shear force connectors of top and bottom plates, and transverse static and antiseismic calculation of the composite girder central span, root and pier top sections. The results show that all indicators of the bridge meet the requirements of the specifications.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2023.06.017

First Page

105

Last Page

115

Submission Date

March 2025

Reference

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