An interaction chart design method for Eurocode compliant railway electrification mast foundations
An interaction chart design method for Eurocode compliant railway electrification mast foundations
复制标题
符合欧洲规范的铁路电气化桅杆基础的交互图设计方法
DOI：
10.1016/j.conbuildmat.2014.05.046
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发表时间：
2015
影响因子：
7.4
通讯作者：
I. Alobaidi
中科院分区：
文献类型：
--
作者：
C. Krechowiecki;I. Alobaidi
英国交通部计划在英国现有的主要线路上安装25千伏架空电气化，作为线路现代化和运营碳减排战略的一部分。铁路电气化桅杆的基础设计对岩土工程师来说是一个特殊的挑战。数百或数千个结构可能需要基础，每个结构都具有不同的负载和地面条件。大量的结构和紧迫的方案时间表意味着，针对具体地点的地面调查和设计是不可行或不经济的，必须制定一套通用设计，以尽可能多地涵盖固有的变化。本文提出了一种设计水平荷载桩的新方法，它避免了对特定荷载工况的大量计算，而是着重于桩的竖向和横向抗力和挠度的基本系统动力学，以推导相互作用关系。本文提出的方法可以适用于各种公式和规范，以满足设计者的偏好。虽然本文的重点是欧洲编码7的使用。本文不建议修改设计公式，但提供了一个更有效地使用这些公式来开发设计。结果最终以一系列设计图表的形式呈现，分配工程师可以根据这些图表绘制所施加的结构荷载，以确定给定设计标准的桩设计长度。这种方法产生了许多好处：最终产品使用简单，能够科普电气化方案中固有的应用负载的巨大变化，它提供了符合欧洲规范的设计，并且与基于现场特定负载的计算相比，生产这些设计所需的时间显着减少。一个特别的好处是，该方法可以更容易地科普迭代和变化，在假设的负载和系统布局，在设计过程中出现。
The UK Department for Transport plans to install 25 kV overhead electrification on existing major routes in Great Britain as part of route modernisation and operational carbon reduction strategies. The design of foundations for railway electrification masts is a particular challenge for geotechnical engineers. Foundations may be required for hundreds or thousands of structures, each with different load and ground conditions. The large number of structures and tight programme timescales mean that site-specific ground investigation and design is not feasible or economic and a set of generic designs must be developed to encompass as much of the inherent variation as possible. This paper proposes a new method for designing laterally loaded piles – which avoids the large number of calculations for specific load cases and focuses instead on underlying system dynamics of vertical and lateral pile resistances and deflections to derive interaction relationships.The methods proposed in this paper can be adapted for use with various formulae and codes of practice to suit the designer’s preference, although the focus of this paper is on the use of Eurocode 7. This paper does not propose modification to design formulae but provides a more effective use of these formulae to develop designs. The results are ultimately presented in a series of design charts upon which the allocation engineer can plot applied structural loads to determine a pile’s design length for given design criteria. This method yields many benefits: the end product is simple to use, it is able to cope with the large variations in applied loads inherent in electrification schemes, it provides a Eurocode compliant design and the time required to produce these designs is significantly reduced when compared to calculation based on site-specific loads. A particular benefit is that the method can cope more easily with iterations and variations in the assumed loads and system layout that arise during the design process.