Structural Design of Main Bridge of Nanjing Xianxin Road Changjiang River Bridge

被引：0
|
作者：
Xiao H. [1 ]
Gao Z. [1 ]
Lu Q. [1 ]
Tang H. [1 ]
Yu J. [1 ]
机构：
[1] China Railway Major Bridge Reconnaissance & Design Institute Co., Ltd., Wuhan
来源：
Bridge Construction | 2024年 / 54卷 / 02期
关键词：
anchorage; diaphragm wal; high-strength steel wire; saddle; steelbox girder; structuraldesign; suspension bridge; windresistance;
D O I：
10.20051/j.issn.1003-4722.2024.02.001
中图分类号：
学科分类号：
摘要：
The main bridge of Nanjing Xianxin Road Changjiang River Bridge is a suspension bridge with a suspended main span of 1760 m and two side spans of 580 m, leading to a sag-to-span ratio of 1/9 and a side span-to-central span ratio of 0.33. The two main cables(an upstream and a downstream cables), each composed of a number of 169 high-strength galvanized aluminum steel wire strands (an individual strand contains 127 steel wires of 5.4 mm diameter and gets a nominal tensile strength of 2100 MPa), were constructed by the PPWS(prefabricated parallel wire strands) method. The hanger cables are pin-connected with the cable clamps, central buckles are added at midspan, and the short hanger cables are fitted with joint bearings. The tower-top saddles are cast-weld composite structures with wide grooves and single longitudinal rib, while the splay saddles are pedestal-type fully-cast structures. The stiffening girder, measuring 31.5 m in full width and 4 m in depth, consists of flat streamlined closed steel boxes, inside which, the top plates and U ribs are joined by double-sided submerged arc full-penetration welding. Supported by bored piles of 2.8 m diameter, the pylons are portal-frame concrete structures rising 277.3 m(full heights), the upper crossbeams are prestressed concrete structures encased with N-shaped steel plates. The south anchorage is mounted on a circular diaphragm wall foundation with an external diameter of 65 m, while the north anchorage is supported on a caisson foundation measuring 70 m by 50 m, 50 m in depth. According to the static analysis, theoretical analysis of the wind resistance of the structure, and experimental studies, the strength and stifness of the structure meetthe requirements. Adding 0.67 m-deep central stabilizers and 1m-wide horizontal stabilizers at the wind fairings alows the fluters and vortex-induced vibrations of the bridge to reach the required levels and the bridge has a degree of damping margin. © 2024 Wuhan Bridge Media Co., Ltd., MBEC. All rights reserved.
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页码：1 / 7
页数：6
相关论文
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