大型集装箱船绑扎桥结构优化设计

为有效降低大型集装箱船的空船重量,针对绑扎桥结构轻量化设计进行研究。以某14500TEU集装箱船为研究对象,根据船级社规范要求针对结构设计方案进行有限元计算分析,依次从剪力墙布置、立柱设置和局部尺寸优化等三个层次对原始方案进行优化设计。研究结果表明,优化方案在满足船级社规范要求、保证堆重指标的同时有效降低了绑扎桥的结构重量。本文的设计思路和优化方法可以为今后大型集装箱船绑扎桥的结构设计提供一定参考。     

Design and Application of Micropiles on Treatment for Landslide of High-speed Railway

Research purposes: The micro-pile has been used in foundation replacement, building reinforcement, retaining soil reinforcement, but the design and calculation theory of the micro-pile is seriously lagging behind. The design and calculation method and content of the micro-pile are not clear, and there are no relevant regulations. In this paper, the design and calculation method of landslide treatment by micro-pile is discussed, and its effect is monitored and analyzed. Research conclusions: (1) There are many advantages such as flexible construction and high construction efficiency. For landslide project with limited terrain, micro-pile has good governance effect and adaptability. (2) The monitoring data show that it is appropriate to adopt micro-pile treatment in the landslide project. After the micro-pile reinforcement treatment, the deformation of the landslide project has been quickly and effectively controlled, and the safety of the tunnel and roadbed engineering has been guaranteed. (3) The design content of the micro-pile should include the overall stability, the length of the pile, the pile spacing, and the reinforcement of the pile. (4) This paper can provide guidance for the design and construction of using micro-piles to control railway landslide. © 2021, Editorial Department of Journal of Railway Engineering Society. All right reserved.     

Local joint flexibility of tubular X-joints stiffened with external ring or external plates

In the present paper, the Local Joint Flexibility (LJF) of the ring-stiffened X-joints and plate-stiffened X-joints under compressive load is investigated. In the first phase, a finite element (FE) model was generated and verified with the results of available experimental tests and equations. In the next phase, a set number of 234 FE models were created to evaluate the role of the external ring size (β_r and τ_r), the external plate size (β_p and τ_p), and the connection geometry (γ, τ, and β) on the LJF factor (f_LJF). In these FE models, the weld connecting the chord and brace members was generated. The results indicated that the f_LJF of a plate stiffened joint can be down to 76% of the f_LJF of the corresponding un-stiffened joint. Also, the effect of the ring size on the f_LJF was more than the effect of the plate size on the f_LJF, because of the stiffener position. Despite the notable effect of the ring and the plate on the f_LJF, there is not any study or formula on tubular connections stiffened with ring or plate. Therefore, the FE results were used to propose two parametric formulas for determining the f_LJF in X-joints with external ring or external plate under brace compressive load. Moreover, the derived formulas were checked based on the UK DoE acceptance criteria.     

半潜式平台码头系泊系统设计

依据半潜式平台受到环境力、缆绳拉力和护舷反力的静态平衡方程,通过优化系船柱间缆绳的可行连接、每组缆绳数量以及每根缆绳的初始长度来提高潜式平台抵御环境条件的能力,并在此基础上建立码头系泊系统的设计方法。根据极限和常规海况码头系泊要求,完成系泊布置方案,并提供操作指导。     

桩式地锚在缆索吊装系统中的应用

桩式地锚由于具有结构轻巧、施工方便、节省成本等优点,在缆索吊装施工中得到了广泛的应用。文章从桩式地锚的设计理论出发,结合工程实践,介绍了桩式地锚的设计要点与施工工艺。     

曹娥江袍江大桥承台钢板桩围堰设计与施工

钢板桩围堰由于具有施工速度快、防水性能好、可重复利用等诸多优点,被广泛应用于桥梁深水基础围堰工程。文章结合曹娥江袍江大桥承台施工实例,介绍了钢板桩围堰结构设计方案与结构验算方法,阐述了其施工工艺要点,为桥梁承台钢板桩围堰施工提供经验借鉴。     

公路平曲线设计在工程可行性研究阶段的探讨

文章针对工程可行性研究阶段的公路平面设计特点,介绍利用小计算器确定平曲线的平面设计方法,为提高工程可行性研究阶段设计的工作效率及质量提供参考。     

乳化沥青冷再生配合比设计浅析

文章结合国道324线百色-平班路段路面大修工程冷再生技术配合比设计实践,介绍该工程乳化沥青冷再生配合比设计的过程和经验,为同类施工提供参考。     

蒲庙大桥维修工程吊杆更换设计

文章以南宁蒲庙大桥的维修加固工程为例,通过全桥结构和吊杆的内力计算,确定了吊杆成品索的钢绞线根数及相关技术特点,阐述了组合式吊杆设计的基本情况,并对比分析了组合式吊杆在旧桥维修加固中的显著优势.     

宁波市北环快速路工程总体设计

论述了北环快速路工程的功能定位,诠释了＂人·交通·环境·和谐＂的设计理念。提出了全线采用＂高架快速路＋地面辅道＂的建设形式,其中和轨道交通共线段采用＂高架快速路和轨道交通一体化共建＂的模式。论证了工程的技术标准及建设规模,提出了总体布置方案,对横断面布置、立交节点、匝道布设、轨道车站设置等进行了详尽的论述。