摘要
为满足城市桥梁的景观和功能等要求,柳州市广雅大桥设计为海鸥式钢箱拱桥,主桥采用跨径布置为(63+2×210+63)m的双孔中承式钢箱拱桥。主桥为刚架系杆拱桥结构体系,横向2片拱肋之间除桥面位置处外未设横撑,边跨设置了副拱;拱肋采用悬链线变截面钢箱拱,净矢跨比为1/4;三角刚架斜腿为主跨同线形拱肋的延续;桥面主梁采用底板开口的正交异性纵横梁格桥面板主梁体系;设置32对环氧涂层钢绞线整束挤压式吊杆,纵向间距9m;布置8束环氧涂层钢绞线整束挤压式系杆。采用MIDAS建立主桥空间模型,计算结构力学性能,结果表明该桥的强度、刚度和稳定性均满足要求。
With a view to suit the aesthetic and functional requirements of urban bridges, the Guangya Bridge in Liuzhou city is designed as a gull-shaped steel box arch bridge. The main bridge, with span arrangement of （63＋2 × 210＋63） m, is a half-through steel box arch bridge which has two continuous spans of arches. The main bridge belongs to a rigid-frame tied arch bridge structure system, the two arch ribs are connected transversely by lateral bracings only at the level of bridge deck, and secondary arch ribs are added to the side spans. The arch ribs adopt the catenarian steel box arch with variable cross section and with a net rise-to-span ratio of 1/4. The triangular oblique rigid-frame legs are the extension of the main span arch ribs with the same geometrical shape. The main girder adopts the orthotropic grillage deck system formed of stringers and transverse beams, with opening on the base plates. A number of 32 pairs of hangers, which are composed of steel strands with epoxy coatings and extruded to take shape from a whole bundle of strands, are installed with a spacing of 9 m along the bridge length. Besides, a number of 8 tie bars, also made up of steel strands with epoxy coatings and extruded into shape from a whole bun- dle of strands are installed. The MIDAS software was used to set up the spatial model of the main bridge to calculate its mechanical performance. The results of the calculation show that the strength, rigidity and stability of the bridge all meet the requirements.
出处
《世界桥梁》
北大核心
2014年第1期6-11,共6页
World Bridges
关键词
拱桥
三角刚架系杆体系
钢箱拱
吊杆
正交异性板
桥梁设计
有限元法
arch bridge
triangular rigid-frame and tie system
steel box arch
hangerl orthotropic steel deck
bridge design
finite element method
