西南山区耐候钢箱组合梁桥设计要点

Design Essentials of Composite Beam Bridge with Weathering Steel Box in Southwest Mountainous Area

耐候钢桥具有疲劳性能和力学性能优越、抗腐蚀性能强、工厂加工制造速度快、现场施工干扰小且后期管养维护成本低等优点,在国外已采取了大批量建设,但国内关于耐候钢桥的建设项目和研究成果均较少。为探究西南山区中小跨径耐候钢箱组合梁的设计与运用,现以国道212线李家沟大桥为工程背景,吸收国内外耐候钢桥建造的发展经验,针对西南山区的特殊建设环境,对免涂装耐候钢箱组合梁桥的总体设计、钢材选择、结构布设、构造细节设计及后期管养的问题进行研究,为同类条件下的耐候钢桥建设提供参考借鉴。

The weathering steel bridge has the advantages of superior fatigue and mechanical properties,strong corrosion resistance,fast factory processing and manufacturing speed,small on-site construction interference,low maintenance and maintenance costs in the late period,and has been built in large quantities abroad.But in China,there are few construction projects and research results of weathering steel bridge.In order to explore the design and application of small and medium-sized span weatherproof steel box composite beams in the southwest mountainous area,taking Lijiagou Bridge in National Highway 212 as the engineering background,absorbing the experience in the construction and development of weatherproof steel bridges a home and abroad,and aiming at the special construction environment in the southwest mountainous area,the overall design,steel selection,structural layout,structural details design and later maintenance of the non-painting weathering steel box composite beam bridges are studied,which provides a reference for the construction of weathering steel bridges under the similar conditions.