摘要
思南岩头河大桥桥位处为典型不对称 V 形峡谷，在综合考虑桥址区的地形、地质及水文等自然条件的基础上，经过方案比选，确定采用非对称连续刚构桥型。针对非对称刚构的合理分跨比、墩高等设计难点进行分析研究。结果表明，该桥分跨比不可小于0．3，取值范围宜在0．5～1．0之间；0．405桥墩墩高比优化了桥墩墩高不对称，减少了两墩的高差，避免了双墩抗推刚度相差过大给墩身及上部结构受力带来的不利影响。最终确定上部结构采用（90＋162） m 非对称连续刚构，主梁为单箱单室截面，设置三向预应力。下部结构根据不同地质条件采用不同的基础形式。
The Yantouhe River Bridge in Sinan county is projected to build at a typical asym -metrical V-shaped ravine .Based on the thorough investigation of the natural environment at the bridge site ,including the topographical ,geological and hydrographical conditions ,a type of asym-metrical continuous rigid-frame structure is determined for the bridge by scheme comparison and selection .The key points in the design of the asymmetrical rigid-frame bridge ,such as the rational side span to main span ratio and pier height ,were analyzed and studied with particular concern . The results indicate that the side span to main span ratio should not be set below 0 .3 ,and better within the range of 0 .5 ~ 1 .0 . The 0 .405 pier height ratio optimizes the coordination between piers ,reducing the height difference of the two piers ,and therefore ,avoiding the unfavorable effect of excessive anti-thrust stiffness difference of the two piers on the pier shafts and the load bearing capacity of the superstructure .As a result ,the superstructure is designed as a （90 ＋ 162） m asymmetrical continuous rigid-frame structure .The main girder adopts the single cell single box cross section and is prestressed in three directions .In response to different geological conditions , the substructure will have different foundation options .
出处
《世界桥梁》
北大核心
2014年第3期5-10,共6页
World Bridges
关键词
连续梁桥
刚构桥
非对称
桥型比选
分跨比
墩高
桥梁设计
continuous girder bridge
rigid-frame bridge
asymmetry
bridge type comparison and selection
side span to main span ratio
pier height
bridge design
