非椭圆接触面下钢轨三维弹塑性应力分析

轮轨接触应力的计算是轮轨关系的一个重要课题。建立了一个任意形状钢轨和车轮在任意点接触时,接触面形状和接触面力的计算模型,然后把计算出的接触面力作为外载施加到三维弹塑性有限元模型中,进行轨头中部应力的计算,从而构成了一个完整的计算方法。最后的计算结果表明,该方法适用于具有复杂外形特征的轮轨接触应力的计算。     

桥梁加宽改造施工方法

介绍了采用吊架施工方法对旧桥进行加宽的基本原理及方法。     

回弹法制定混凝土专用测强曲线的步骤和方法

文章基于回弹法的基本原理,结合工程实例,介绍了混凝土专用测强曲线制定的步骤和方法,为道路工程混凝土强度推定提供方法依据。     

The multi‐actor,multi‐criteria analysis methodology (MAMCA) for the evaluation of transport projects: Theory and practice

In this paper the multi‐actor multi‐criteria analysis (MAMCA) method to evaluate transport projects is presented. This evaluation method specifically focuses on the inclusion of qualitative as well as quantitative criteria with their relative importance, defined by the multiple stakeholders, into one comprehensive evaluation process in order to facilitate the decision making process by the different stakeholders. The MAMCA methodology is introduced by an overview of other evaluation methods for transport projects in the past and is illustrated by means of two practical cases. The introduction will lead us to the theoretical conception of the MAMCA method where we draw the attention to the proven usefulness of the MAMCA for the evaluation of transport projects and the inclusion of different kinds of stakeholders, individuals as well as groups, into the evaluation process.     

Development of port service network in OBOR via capacity sharing: an idea from Zhejiang province in China

The ‘Silk Road Economic Belt and the 21st-Century Maritime Silk Road’ (One Belt One Road, OBOR) strategy initiated by the Chinese government has a significant impact on the business and logistics modes which involves Asia, Europe, Africa, and their adjacent seas. Many countries and ports are developing new strategies that are suitable for this economic environment. Compared with many ports in the world, the ports in Zhejiang province of China have a novel property. In addition to Ningbo-Zhoushan port, there are several other sea ports and river ports in that province. In this paper, we propose a concept of port service network that consists of a huge hub and multiple ports. Ports of small and medium sizes can share their capacities of different types of port service with the hub when the service capacities are integrated into the network. We develop a mixed integer nonlinear programming model to determine the optimal decisions in such a network with constraints on the budget to conduct integration. An optimization algorithm incorporated with a genetic algorithm is developed to solve large size problems. We provide managerial insights on the policies of government, including expanding port capacity, reducing fixed integration cost, and providing better financial condition.     

多桨船附体阻力的预报方法

多桨船是舰船的必要船种,而“多桨船附体阻力预报方法”是多桨船实船快速性预报的基础。对现有附体阻力预报方法进行归纳,介绍了经验公式估算方法、船模试验估算方法和CFD数值计算方法的基本原理,讨论现有方法对于多桨船附体阻力预报的可行性,具有实际意义。     

比例延迟微分方程线性多步法的散逸性

考虑了比例延迟微分方程的数值方法的散逸性,把一类线性多步法应用到以上问题中,得到了该数值方法的散逸性结果。     

Hilbert空间广义变分不等式的迭代方法

应用辅助原则技术,在部分相关强单调和非空有界闭子集条件下,提出了一个解广义变分不等式问题的预测校正算法.作为应用,给出了许多解不同类型变分不等式的新的结果.     

公路自然区划方法探讨

针对当前公路自然区划的研究现状,特别是公路自然区划的理论体系与区划方案的研究,结合我国近20年来的公路建设的实际与取得的研究成果,从新的理论体系、方法层面上对公路自然区划进行新的研究,并结合地理信息系统的最新理论和软件,提出更加合理更适合国土现状的公路自然区划的原则、方法及指标体系.     

拉顶管工艺在复杂环境中的应用

城市排水管网的施工主要有两种：明敷施工和非开挖施工。非开挖施工主要包括水平定向钻工艺、顶管工艺和拉顶管工艺。现有规范的顶进阻力计算中未考虑管道自重产生的摩阻力且迎面挤土压力的计算多依靠经验。结合潮州市枫江深坑国考断面达标攻坚工程（潮州段）一期工程实际,介绍拉顶管工艺施工步骤及施工特点,对规范给出的顶进阻力计算公式进行优化,从而得出设备所需最小顶推力及机头回拉力,为合理选择拉顶管设备提供依据。对不同铺管工法进行比较,为类似工程施工提供借鉴。