铁道货车组合式制动梁试验方法研究

介绍了TB/T1978—2007《铁道货车组合式制动梁》中对制动粱的强度试验要求，并与国外先进标准进行了比较，根据标准设计了制动梁静强度、疲劳试验工装。     

横梁位置对车架中间区域强度的影响

运用有限元分析法,采用合理的模型简方法化建立某工程车车架CAE模型,运用有限元软件HyperMesh对不同横梁布置位置的车架进行弯曲和扭转两种工况的应力分析,为车架结构设计提供理论依据。     

Carpooling problem: A new mathematical model,branch-and-bound,and heuristic beam search algorithm

Carpooling is an environmentally friendly transportation system. It can efficaciously help resolve a variety of societal concerns of the urban areas, ranging from traffic congestion to environmental pollution. In this paper, we propose a new mathematical model to solve the carpooling problem. The model simultaneously minimizes the costs of travel times, the vehicle use, and the vehicle delays. An exact solution method based on Branch-and-Bound (B&B) algorithm is proposed to efficiently obtain the optimal solution of the problem. In order to find the near-optimal solutions for large-scale problems, a heuristic beam search algorithm is introduced, which is based on the partial relaxation of some fathoming criteria applied in our proposed B&B. The computational experiments are conducted, based upon the transportation network of Isfahan city, Iran. The results demonstrate the great capability of the proposed exact solution method in terms of both computational solving time required and the number of the evaluated nodes, in comparison with CPLEX software package. The findings of this research can be applied to solve the carpooling problem compatible to the real-life situations.     

基于模糊层次分析法的梁桥加固方案优选

通过建立提高梁桥承载力加固方案的多层次多目标的模糊优选模型,提出了基于模糊数学和层次分析法的桥梁加固方案优选方法,并结合具体的梁桥加固实例,阐述了模糊层次分析法在评价和加固方案优选中的具体运用过程。     

公路架桥机主梁的设计计算

介绍了ＪＱＧ系列公路架桥机主梁的设计计算，并提出了主梁的连接设计及最佳截面的选择。     

厦漳跨海大桥南汊主桥高低腿龙门吊设计与研究

钢-砼组合梁以其自重小,能充分发挥钢材的抗拉性能和砼的抗压性能,以达到增加桥梁的抗弯性能和强度等特点,在斜拉桥主梁中应用越来越广泛.组合梁的钢梁部分在工厂制作成一个个构件,运送到现场拼装,砼部分可以现浇也可以预制安装,因此组合梁吊装施工中构件的起吊是关键一环.针对用于厦漳跨海大桥南汉主桥组合梁构件起吊的高低腿龙门吊的研究设计做了介绍.     

金属梁柱式桥梁护栏实用设计方法

从桥梁护栏防撞等级、护栏结构设计、细节优化设计、护栏颜色四个方面入手,利用结构力学、材料力学、色彩心理学等基础学科,结合规范条文要求,提出一种比较实用的设计方法,供护栏设计参考。     

弯沉车后轴轮胎对贝克曼梁法测定弯沉的影响

不同弯沉车对弯沉测定结果会有影响,为了提高弯沉测量一致性,需要分析弯沉测量的主要影响因素,并对主要影响因素进行控制.通过不同路面结构的弯沉测定试验和模型分析,评价了单后轴荷载以及后轴轮胎的类型、胎面花纹、层级、轮胎压力和轮胎尺寸对路面弯沉测定的影响.数据分析表明弯沉车荷载和轮胎特质对弯沉测定结果影响较大,仅仅控制荷栽是...