水位升降对岩质路基边坡稳定性的影响分析

在沿江、河、湖畔道路及湖泊道路建设中,由于水的作用,地质灾害频繁发生,甚至毁坏道路并造成重大人员伤亡及经济损失。由于道路具有跨区域广及评价面积小的特点,故寻求合理有效的分析理论与方法成为有效控制灾害发生的关键。     

土-结构相互作用体系自振特性的计算

通过将半无限弹性土体转化为附着在结构基础上的复刚度,建立起土结构体系的联合模型,并推导出该模型的扩展特征方程,通过求解特征方程,研究了地基对于结构自振特性的影响,得到了一些有益的结果。     

地震时跨断层海底管道的屈曲分析

地震时,考虑海底管道与土介质的相互作用,对将跨断层海底管道作为薄壳结构时的断层位错反应进行分析计算.利用Ansys分析软件,将管道模型简化为四节点薄壳单元结构, 土介质简化为弹塑性弹簧,建立管土相互作用的有限元分析模型,进行分析计算.根据计算结果以及海底管道屈曲校核准则描绘出管道破坏等级范围分布图.最终得出结论:地震时在大位移断层运动作用下,海底管道存在明显的屈曲变形,在屈曲变形较大处,海底管道发生断裂.     

基于序列预测蛋白质和RNA的相互作用

从计算的角度出发,考虑到当前蛋白质和RNA相互作用数据的实际情况,基于蛋白质和RNA的序列成分信息,构建预测模型.通过来自PDB的3149个蛋白质-RNA相互作用对得到的氨基酸三联体-核苷酸的相互作用倾向性值,定义了一个权重倾向性度量,用来度量每一对蛋白质-RNA序列中三联体-核苷酸的相互作用倾向性.为了避免特征的冗余性,基于较高倾向性以及成分特征构建特征向量,用于预测蛋白质-RNA相互作用.计算结果显示文中预测模型(SVM模型)和算法的有效性.     

地震-波浪耦合作用下考虑相位差影响的深水桥墩动力响应分析

跨海深水桥墩往往受到不可忽视的波浪作用,在设计时需考虑波浪力.在地震作用下,桥墩附近海域的波浪场受到地震动水压力的干扰,波浪作用也受到影响,桥墩的动力响应需考虑两者的耦合作用.另一方面,地震起振时,墩底处地震波的相位可简单视为0,而桥墩处的波浪相位可能在0～2π之间变化,地震与波浪之间的相位差将直接影响波浪作用的大小,...     

公路隧道大型振动台抗减震模型试验方案设计

西藏某隧道隧址区地震烈度高,受多条活动断层影响,为了确保隧道抵御强震和减小活动断层对隧道的影响,对该隧道进口段大型振动台模型试验方案进行研究。首先介绍振动台模型试验模型箱的设计,并对整个模型体系模拟的范围和相似关系进行剖析。然后,在参照已有研究成果并结合本次试验拟定的相似关系基础上,确定模拟模型岩层和模型衬砌的材料。同时,以该隧道进口段数值模拟结果为基础,选择振动台模型试验测点的布置位置。最后,结合隧址区所处的地震环境,编制模型试验的加载制度。最终试验现象证明,本次试验方案是成功的。     

倾斜荷载下群桩有限元分析方法探讨

采用Coodman单元模拟桩土界面的相互作用，利用有限元分析方法对倾斜荷载下群桩的受力特性进行探讨，并开发出适用于各种荷载形式的计算程序。工程实例分析表明，该方法能充分反映桩土作有机理及群桩作用效应，具有一定的理论意义与工程实用价值。     

Study of collision characteristics of water-filled double-layer structure

Water-filled double-layer structures are typical hull structures. However, the effect of the carried water has often been neglected in previous collision studies. The carried water couples with the hull structure and participates in the energy absorption process, which reduces the collision damage done to the hull structure. This paper focuses on the effects of compressible carried water on the collision characteristics of a hull structure. Therefore, collision experiments with a simplified double-layer structure (water tank) were performed, and the corresponding collision process was simulated with the finite-element method. The two kinds of pressure (a shock wave and pressure disturbance) generated in the carried water when the water tank collides with a striker were investigated. By comparing the dynamic characteristics of empty and completely filled water tanks, it can be observed that the pressure of the carried water can reduce the displacement of the outer plate and change its deformation shape. Furthermore, the effects of pressure on the collision force and displacement of the inner plate were investigated. Finally, the collision characteristics of a typical water-filled side structure are presented as an example.     

Smart charging management for shared autonomous electric vehicle fleets: A Puget Sound case study

Increasingly, experts are forecasting the future of transportation to be shared, autonomous and electric. As shared autonomous electric vehicle (SAEV) fleets roll out to the market, the electricity consumed by the fleet will have significant impacts on energy demand and, in turn, drive variation in energy cost and reliability, especially if the charging is unmanaged. This research proposes a smart charging (SC) framework to identify benefits of active SAEV charging management that strategically shifts electricity demand away from high-priced peak hours or towards renewable generation periods. Time of use (TOU), real time pricing (RTP), and solar generation electricity scenarios are tested using an agent-based simulation to study (1) the impact of battery capacity and charging infrastructure type on SAEV fleet performance and operational costs under SC management; (2) the cost reduction potential of SC considering energy price fluctuation, uncertainty, and seasonal variation; (3) the charging infrastructure requirements; and (4) the system efficiency of powering SAEVs with solar generation. A case study from the Puget Sound region demonstrates the proposed SC algorithm using trip patterns from the regional travel demand model and local energy prices. Results suggest that in the absence of electricity price signals, SAEV charging demand is likely to peak the evening, when regional electricity use patterns already indicate high demand. Under SC management, EVs with larger battery sizes are more responsive to low-electricity cost charging opportunities, and have greater potential to reduce total energy related costs (electricity plus charging infrastructure) for a SAEV fleet, especially under RTP structure.     

混合交通流交叉口共享空间交互行为建模及仿真

为准确刻画交叉口共享空间内交通个体的运动和交互过程，并为智能汽车虚拟测试提供可靠背景交通流仿真环境，本文提出一种混合交通流交叉口共享空间交互行为模型。基于人类认知过程，模型被设计为“感知-决策-执行”的3层通用框架结构，模拟混合交通流中不同类型交 通个体从感知、决策直至执行的交互全过程。感知层提出一种二维平面交互对象选择方法，通过个体感知范围和轨迹冲突有序筛选交互对象，表征冲突交互的动态性特征；决策层基于当前时刻的交互对象和实时交通环境状况，使用交互行为决策方法为不同类型的交通个体分别选择适合的行为进行交互；执行层通过计算生成执行当前行为决策所需要的轨迹、加速度等关键参数，共 同控制仿真个体按照行为决策结果在二维平面上运动和交互。基于智能汽车Opendrive高精度 路网，构建虚拟测试仿真平台，并将所提出的模型注入平台进行测试。仿真结果表明，模型能较 好地复现交叉口共享空间中交通个体间的交互。研究结果有助于为智能汽车虚拟测试提供可靠背景交通流环境，并进一步提高虚拟测试工具的测试可信度、测试效率及泛化能力。