桩基支撑轨道梁结构设计影响因素分析  

Influencing factors of structural design for track beam supported by pile foundation

作　　者：邓涛[1] 戈浩波 陈章楷 DENG Tao;GE Hao-bo;CHEN Zhang-kai(CCCC-FHDI Engineering Co.,Ltd.,Guangzhou 510230,China)

机构地区：[1]中交第四航务工程勘察设计院有限公司,广东广州510230

出　　处：《水运工程》2022年第8期161-166,200,共7页Port & Waterway Engineering

摘　　要：桩基支撑轨道梁是具有弹性支座的连续梁结构,计算发现并非轨道梁尺寸越大,结构就越安全。设计参数相近时不同项目采用的轨道梁尺寸及桩基布置有较大差异。对此,从桩基竖向抗压刚度、桩距、轨道梁刚度3个方面进行轨道梁内力分析。结果表明当荷载和桩基布置确定时,存在一个最优梁高,使得轨道梁钢筋用量最小。进一步分析可知,当荷载和梁长度一定时,轨道梁的内力分布与桩和梁的相对刚度有关。在设计桩基支撑轨道梁时需试算出最优相对刚度,可使内力分布更合理且节省工程造价。同时,基于工程实例给出不同桩距下的最优相对刚度区间,可为类似项目的设计提供参考。The track beam supported by pile foundation is a continuous beam structure with elastic support.It is found that the larger the track beam size is,the safer the structure is.When the load and foundation parameters are similar,the track beam size and pile foundation layout adopted by different engineers are also quite different.Aiming at this problem,this paper analyzes the internal force of track beam from three aspects,i.e.vertical compressive stiffness of pile foundation,pile distance and stiffness of track beam.The results show that when the load and pile foundation layout are determined,there is an optimal beam height to minimize the amount of reinforcement in the track beam.Further analysis shows that when the load and beam length are certain,the internal force distribution of track beam is only related to the relative stiffness of pile and beam.When designing pile foundation to support track beam,it is necessary to try to calculate the optimal relative stiffness,which can make the internal force distribution more reasonable and save the project cost.Moreover,the optimal relative stiffness interval under different pile distances is given,which can provide reference for the design of similar projects.

关 键 词：桩基轨道梁 桩竖向抗压刚度 断面尺度 相对刚度 

分 类 号：U656.1[交通运输工程—港口、海岸及近海工程]