铁路桥涵翼墙倾斜原因及加固方案分析

文章针对铁路工程中出现的桥涵翼墙倾斜病害,分析了病害发生的原因,提出了临时加固和永久加固的病害整治方案,并对该加固方案进行了评价,提出了保证铁路运行安全的相关建议。     

某刚性吊杆系杆拱桥病害分析及加固对策研究

文章依托某系杆拱桥维修加固工程案例,分析了该桥型的典型病害及其成因,从加固原理及适用性出发,对该桥的加固方法进行比对研究,得出了合理的加固方案,并建立有限元模型对加固方案进行了验算分析,以期为该桥型的病害处置提供理论参考。     

崇左大桥病害的诊断及处理方案探讨

文章结合广西崇左大桥病害治理工程实例,对危桥病害成因及处理方案进行了分析,为危桥检测、加固提供了参考。     

斜交桥梁桥台拱胀开裂分析及加固方法

斜交桥梁桥台钝角侧墙、前墙容易发生拱胀、开裂病害，文章结合工程实例，分析了桥台产生拱胀开裂病害的原因，提出了预应力钢筋对拉加固和植筋加固墙加固的处理方案，并对两种加固方案的造价和施工技术进行了比较。     

特重型物件过桥的临时性加固技术方案探讨

文章结合山东省威海市嘉泰桥，对装载特重设备车辆荷载作用下的典型桥梁所采用的临时性加固技术方案进行了论证，具体阐述了加固方案的工艺流程及施工要点。通过通车前后病害的对比分析，发现该桥梁病害没有进一步的发展，表明该临时性加固方案是合理可行的。     

旧桥加固改造及其技术的运用

文章以旧桥加固改造方法为研究对象,结合具体旧桥加固改造工程,分析了旧桥主要病害及原因,阐述了旧桥加固改造方法,并以铰缝加固方案为例,探讨了旧桥加固改造技术的应用效果。     

庆阳高庄桥加固方案研究

文章根据甘肃省庆阳市高庄桥的病害调查,分析了产生不同病害的原因,提出钢筋混凝土套箍封闭主拱拱肋、黏贴钢板加固主拱拱肋和活性微粉混凝土（RPC）套箍封闭主拱拱肋三种加固方案,并对拱桥加固前后的结构进行有限元分析,论证三种加固方案对拱桥的应力改善效果。     

刚架拱桥上部结构加固维修技术研究与应用

以204国道墨水河大桥加固维修为实例,介绍了刚架拱桥上部构造病害特点及其成因,提出了综合加固维修方案,详细介绍了施工工艺与技术要求。     

连续梁桥桥墩偏位应急加固设计和效果评价

文章依托广西区内某高速公路桥梁,针对该桥在运营过程中出现的桥墩严重偏位情况,分析了桥梁的结构病害,提出了应急加固处理方案,并评价了加固处理效果,为今后同类型桥梁病害的快速处理提供参考。     

钢筋砼T梁桥的病害成因和维修方案探讨

结合徒骇河大桥病害检测,分析了T型组合梁桥的病害成因,并提出了可行维修加固方案。     

高速公路车辙与裂缝问题的对策研究

文章针对目前高速公路沥青路面出现车辙和裂缝病害的问题,分析产生病害的原因,提出了利用不断变换行车道位置,恢复沥青路面的粘弹塑性,避免裂缝产生,延长路面使用寿命等解决高速公路车辙与裂缝的对策。     

弯曲宽箱梁受力性能分析

曲线梁桥由于其结构自身存在着弯扭耦合问题,因此其设计、施工及研究的难度比直线桥大得多。文章以某弯曲宽箱梁为依托工程,运用有限元软件AN-SYS建立简支曲线钢箱梁模型,对其空间受力性能进行分析,得出了其在自重作用下的应力状态和支座处剪力滞效应规律。     

浅析高速公路突发公共事件应急保障体系建设

文章针对当前高速公路突发应急公共事件应急保障体系的现状,分析高速公路突发公共应急事件产生的原因,结合高速公路突发公共应急事件的特点,提出建设高速公路应急管理体系的原则和构想。     

无核密度仪在沥青路面施工中的应用

文章通过对美国产PQI-301路面无核密度仪的应用,介绍了其标定的具体方法及其对沥青路面施工过程中的碾压工艺的确定、压实度的测定及在路面离析情况分析中的作用。     

Optimal pricing for build-to-order supply chain design under price-dependent stochastic demand

Build to order (BTO) is a supply chain disruption mitigation strategy. Whereas cost minimization is an operational objective, the goal of the BTO manufacturer is to maximize its profit by using pricing as its competitive decision-making strategy. In this paper, we study a BTO manufacturer who simultaneously determines its product prices and designs its supply chain network to maximize its expected profit under price-dependent stochastic demand. We propose an L-shaped decomposition with complete enumeration to solve for optimality and show that the expanded master problem remains convex programming, although the optimality cuts are quadratic inequalities. The computational results demonstrate that stocking up on differentiated components and allocating modules appropriately to meet realized demand is a resilient policy that sustains variations in demand. Furthermore, the pricing decision balances the expected revenue and expected operating cost with an increase in expected profit. The integration of pricing and operational planning results in a higher expected profit than by individual decisions. We also demonstrate that cost minimization may not provide the same level of profit if the manufacturer overestimates or underestimates its most profitable demand.     

某公路条带式加筋土挡墙的设计与讨论

加筋土挡墙因其良好的结构性能和低廉造价,在多个行业中应用较广。文章通过对一个条带式加筋土挡墙实例的分析,简要说明加筋土挡墙的设计方法,分析了地震荷载对挡墙稳定性的影响,论述了加筋土挡墙较好的抗震性能。     

南宁市白沙-友谊大道互通式立交选型设计

文章以南宁市白沙-友谊大道互通式立交为研究对象,介绍了其工程概况与地形地貌,并对其交通量进行预测分析,同时结合其立交功能定位阐述了该立交方案的选型设计思路,通过对互通式立交型式进行综合比选,推荐出了功能完善、造价低的互通方案,可为城市道路立交工程设计提供参考和借鉴。     

单层保温海底管线在铺设状态的压溃分析

单层保温管进行结构设计时,为了确定在铺管作业过程中海底管道不被破坏,不仅需要进行常规铺管计算,还要考虑海底管道各层的受压情况,进行压溃计算。文中结合渤中28—2S项目基本设计,对单层保温管压渍应力的2种计算方法进行了分析研究,给出了结论和建议。其有限元计算结果已用于该工程项目设计,并通过了第三方检验机构的检查。     

Local shopping as a strategy for reducing automobile travel

Transportation - Suburban development in the US is widely criticized for its contribution to automobile dependence and its consequences. Not surprisingly, then, a return to more urban-style...     

A Descriptive Framework for the Development and Operation of Liner Shipping Networks

Abstract

Successful mass transit solutions are rare in poor cities. When they appear they are lauded across the globe and too often copied uncritically. The latest exemplar of such best practice is the ‘Transmilenio’ rapid bus system in Bogotá. The article describes its main characteristics and applauds the improvements that it has already brought to urban transport in Bogotá. Naturally, the system is not without its flaws and these need to be drawn to the attention of those who might copy the Bogotá example. This is particularly important at the present time when the jewel of Bogotá has come under surprisingly strong local criticism over its cost, its ownership structure, its decreasing effectiveness and, fundamentally, because it has failed to solve the transport chaos of Bogotá. There is a real danger that ‘Transmilenio’ will stagnate as its popularity declines and as demands for a metro increase. Given the strengths of the system that would be something of a disaster and, most certainly, not in the interests of the poor.