摘要
铁路连续刚构桥百米以上高墩的设计,不能仅限于满足传统的应力以及强度要求,更关键的控制因素有:墩身纵、横向刚度,墩顶弹性水平位移以及高墩的稳定性等。文章以准朔铁路大沙沟特大桥刚构墩为工程背景,论述了高墩设计中的关键要素及控制要求。对矩形空心墩和双薄壁墩的构造特点和适用范围进行了对比分析,对刚构墩常用的2种横向墩形一次放坡和变宽板形墩的设计指标进行了研究比较,并对变宽板形墩变宽点高度的设置提出了合理建议。研究表明对于百米以上高墩,矩形空心墩较双薄壁墩在更好提供纵向柔度的同时,并保证了墩身的横向刚度。变宽板形墩其变宽点宜设置在1/3墩高处时,墩顶弹性位移,墩身圬工量具有较合理的设计指标。文章通过总结高墩设计中的一些关键技术,为类似高墩桥的设计及墩形选择提供了参考。
For the design of over hundred meters high-pier of railway continuous rigid frame bridge,only satisfy the traditional needs of stress and strength is not enough. There are more key controlling factors,like pier longitudinal and lateral stiffness,elastic horizontal displacement of the pier top and the stability of high-piers and so on. Using the rigid frame pier in Dashagou bridge of the DaZhun-ShuoHuang railway as background,this paper discusses the key elements and control requirements in the design of high-pier. It carries on the contrast analysis for the rectangular hollow pier and the double thin-wall pier characteristics and applicable scope. Besides,this paper studies the design indicators of the two kinds of commonly used rigid pier that are single slope form and wider strip shape. It puts forward reasonable suggestions for wider point height settings of wider strip shape pier. The research suggests that,for hundreds of meters high pier,rectangular hollow pier can provide better longitudinal compliance and lateral stiffness than double thin-wall. For wider strip shape pier,the wider point should be set in a third pier height,which can provide the reasonable design index for elastic displacement of pier top and the amount of masonry shafts. This paper summarizes some key technologies in the design of high-pier,which can provide some reference to the design and pier shape choosing of the similar structure.
出处
《高速铁路技术》
2014年第4期77-81,共5页
High Speed Railway Technology
关键词
高墩
刚度
稳定性
墩顶位移
横向墩形
high-pier
stiffness
stability
pier top displacement
lateral pier shape
