独塔混合梁斜拉桥总体设计及关键技术研究

摘要:

以一座独塔柱混合梁斜拉桥为工程背景,大桥具有结构不对称度高、钢混结合段受力复杂、斜拉索锚固方式多样、抗震烈度高等设计特点和难点,通过采用UHPC混凝土、PSB930高强螺纹钢筋、低回缩锚具新型材料,采用综合调索方法、有限元分析方法、抗震措施等技术手段,采用预应力二次张拉施工工艺,科学地解决了独塔混合梁斜拉桥的多项关键技术难题,达到结构受力合理、安全可靠的目的,为同类型桥梁设计与研究提供了思路。

Abstract:

Taking a single tower hybrid beam cable-stayed bridge as the engineering background,which has the design characteristics and difficulties of high asymmetry, complex stress of steel-concrete composite segment, various cable anchorage modes, high seismic intensity, etc. By using new materials like UHPC concrete, psb930 high-strength threaded reinforcement, low retraction anchorage, by using technique like comprehensive cable adjustment method, finite element analysis method, seismic measures, by adopting technology like prestressed secondary tensioning construction, many key technical problems of single tower hybrid beam cable-stayed bridge are scientifically solved, so as to achieve the purpose of reliable stress and structural rationality, safety, which provide ideas for design and research of similar bridge.