刚性系杆在软土地区上承式坦拱桥中的应用

介绍了预应力技术在上承式拱桥中的研究及应用现状,提出了在上承式拱桥两桥台之间设置预应力混凝土刚性系杆来平衡水平推力的新思路,并结合背景工程,系统地研究了这种结构体系的受力机理、设计方法及结构控制指标,指出了其相对于柔性系杆的优势及适用条件,并针对地基土比例系数m进行了参数敏感性分析。计算结果表明,参数m的取值对结构受力状态影响显著,建议在地质勘察报告提供的取值范围内选取多个值进行试算。

Application of Rigid Bowstring in Deck Arch Bridge in Soft Soil Area

The article introduces the study and the application status of the pre-stressing technology in the deck arch bridge,puts forward the new idea of setting up the pre-stressed concrete rigid bowstring between two abutments of the deck arch bridge to balance the horizontal thrust,and according to the engineering background,systematically studies the stress mechanism,design method and structural control index of this structural system,points out its superiority and applicable condition relative to the flexible bowstring,and analyzes the parameter sensitivity aiming at the subgrade soil proportion coefficient m.the computation result shows that the value of parameter m obviously influences the structural stress status.The article proposes to select many values within the value range provided in the geological survey report to compute it.