Estimation of pavement rehabilitation cost using pavement management data

Estimation and scheduling of future pavement maintenance and rehabilitation (M&R) works are one of the primary concerns of highway agencies due to the limited allocations in budget and resources. Two approximate methods for estimation of pavement rehabilitation cost are presented and compared in this study based on highway present condition index (HPCI) and rehabilitation history. The former is based on pavement condition, while the latter is based on historical and statistical trends. Database from a pavement management system (PMS) of various highway sections surveyed in Korea were used in this study to establish a relationship between HPCI and pavement service life and to analyse the trends of rehabilitation periods. The two simple methods presented provide useful information and probable range for the various highway agencies to guide them in the preliminary planning, budgeting, estimating and scheduling of their future pavement M&R works.     

Improved visualization of infrastructure monitoring data using building information modeling

Abstract

With growing complex infrastructure, autonomous condition assessment of large-scale structures has garnered significant attention over the past few decades. Data-driven structural health monitoring (SHM) techniques offer valuable information of existing health of the structures, maintain the safety and their uninterrupted use under varied operational conditions by undertaking timely risk and hazard mitigation. Traditional approaches, however, are not enough to monitor a large amount of SHM data and conduct systematic decision making for future maintenance. In this article, building information modeling (BIM) is utilised as a promising computing environment and integrated digital representation platform of SHM that can organize and visualise a considerable amount of sensor data and subsequent structural health information over a prolonged period. A BIM-enabled platform is utilised to develop the proposed visualisation tool for a long-span bridge and enable automated sensor data inventory into the BIM environment. Such automated tool facilitates systematic maintenance and risk management, while avoiding manual errors resulting from visual inspection of the structures. The proposed method can be considered as a user-friendly and economic framework for condition assessment and disaster mitigation of structures from long-term monitored data.     

提升轨道交通减振综合设计水平的探讨

在总结轨道交通减振措施及应用经验的基础上,系统分析了为提升减振综合设计水平需考虑的最高设计速度、特殊的桥梁结构类型、线路在线网中的建设时序等相关工程条件,并对减振设计需考虑的关键因素作了介绍,以确保铁路长期运营的安全性。     

车辆荷载作用下高速公路路基路面动力研究

车辆与道路之间动荷载问题是一个非常复杂的相互过程,在充分考虑振动荷载产生机理的基础上,从车辆荷载的重要形式、车辆荷载的模拟、路基有限元模型的建立等方面,研究了路面在车辆动载作用下的动态响应特征。     

综合交通枢纽电力监控系统干扰分析与解决方案

以深圳北站综合交通枢纽变配电所的电力监控系统为背景,针对变配电所电力监控系统中存在干扰的问题进行了详细分析,并结合现场实际提出了抑制干扰的措施,从实际运行效果来看,抗干扰措施得当,整个系统取得了较好的监控效率。     

Estimating post-disaster traffic conditions using real-time data streams

This article presents a technique to determine the effects of an earthquake on road traffic conditions by linking seismic hazard and bridge fragility models with a traffic model and traffic sensor data. Using the earthquake characteristics as an input to the traffic model, the traffic conditions are sequentially estimated given traffic sensor measurements using an ensemble Kalman filter. The proposed algorithm is tested on a numerical experiment on Interstate 155 West near the New Madrid Seismic Zone in New Madrid, Missouri. The results show that the proposed technique improves the post-disaster traffic estimate. The supporting source code and data are available for download at https://github.com/rotsuka/postDisaster_EnKF..     

Real-time drill monitoring and control using building information models augmented with 3D imaging data

The problem of placing embeds into existing reinforced concrete structures without damaging reinforcement bars is an industry-wide challenge for the construction industry. This paper presents research that investigated real-time monitoring approaches for hazardous engineering processes. A conceptual solution for processing and incorporating point cloud data obtained from 3D imaging technologies¹ into the drilling process in was developed. The 3D imaging technologies were used to map the locations of rebar within a section of a railway bridge deck. Once the point clouds were processed, zones which are safe for drilling were automatically detected and saved as a Building Information Model (BIM). The BIM was used to provide real-time feedback to the drill operator about whether it is safe to continue drilling based on the position and orientation of the drill. The results showed the feasibility of real-time feedback for improving the safety, productivity, and quality of engineering processes by helping avoid the time and cost of rework.     

海洋牧场环境信息综合监测系统的设计与实现

为实时掌握海洋牧场环境参数的动态变化和养殖生物的活动状态,采用海洋环境因子及水下影像采集和传输技术,以自制浮标平台为载体,在有效解决多路传感器数据并行采集及远程传输、水下摄像头承载装置的防水密封、水下影像数据远程传输等关键技术的基础上,研发了海水养殖环境信息综合监测系统。结果表明:该系统同时调用多个串口进行数据采集,能保证在一个时间节点上多参数水质数据的及时采集和准确性;采用丁腈橡胶材料构成的压紧螺母式电缆密封装置能有效防止海水的渗漏和腐蚀;解码板的分辨率设置为QCIF或者CIF模式,最大码率设置为120 kbps,帧率设置为8~15时,图像的流畅和清晰度较为适中。研究表明,该系统可用于海洋牧场水环境因子监测和水下养殖生物实时监测。     

Spatiotemporal matching method for tracking pavement distress using high-frequency detection data

Various algorithms based on deep learning have achieved promising results in pavement distress detection. However, the detected distresses are not tracked throughout the life cycle. In long-term application scenarios, pavement distresses may take on different forms due to image acquisition mode, distress development, and environmental change, which make tracking distresses a tough question. We present in this study a spatiotemporal matching method based on high-frequency real pavement distress datasets. Pavement distresses of fixed routes were collected 30 times over 5 months, and distresses with spatiotemporal information were obtained at time series. We apply image rectification, stitching and distress class, and bounding box generation algorithms for pre-processing to align the collected images to the same-detail level and angle. A four-step spatiotemporal matching module is designed, including global positioning system (GPS) filtering, class filtering, relative position filtering, and distress feature filtering. The results reveal that the comprehensive rank-3 hit rate of the matching method reaches 88.73%, and the method is robust to environmental factors, which helps show performance decay of distresses and the effect of maintenance operations. It is concluded that the spatiotemporal matching method is convenient to operate, and it lays the foundation for an agency to track distress evolution and make timely treatment of distresses in the life cycle.     

重载交通下路面结构组合设计探讨

分析了重载交通下沥青路面的损害情况,并结合工程实例,从结构层厚度、层间粘结、路面材料以及路线纵坡等方面,合理进行了重载交通区路面结构组合设计,保证了道路的使用寿命和运营安全。     

彩色路面在交通安全中的应用

结合色彩心理学介绍了彩色路面在交通安全领域中的使用情况,分别阐述了色彩的交通特性,道路交通环境色彩配置及彩色路面的作用,以推动彩色路面技术在交通安全领域的应用,提高我国道路安全水平。     

GPS路况养护信息实时监控系统在公路养护中应用

针对以往高速公路养护监控方式的弊端,对GPS路况信息实时监控系统在高速公路养护中的应用进行了尝试,详细介绍了应用的目的、内容、特点及效果,并进行了经济社会效益分析,指出了今后该系统应用亟待解决的问题,以促进高速公路养护管理跨越式发展。     

高速公路交通安全属性综合评价模型

在综合分析影响高速公路交通安全因素的基础上,建立了高速公路交通安全评价的指标体系;利用改进层次分析法确定评价指标权重;依据属性识别理论知识,建立高速公路交通安全属性综合评价模型;评价模型根据单指标的属性测度值与多指标的综合属性测度值,利用属性识别分析及评分准则来评价高速公路交通安全的现状。     

道路抗滑性能与交通安全状况的相关分析

根据抗滑力构成机理,对不同车速情况下路表微观构造、宏观构造与道路交通安全状况的相关关系进行分析,同时对我国现行标准与规范中涉及摩擦系数评价的有关规定提出修改建议。     

多孔混凝土用于重载交通沥青路面基层的结构设计

针对高寒地区重载交通水泥稳定碎石基层沥青路面存在的水损害问题,采用具有较大孔隙率和较高强度的多孔混凝土作为沥青路面的排水基层。结合多孔混凝土的刚性特征,初拟路面结构,采用Hpds软件对多孔混凝土基层沥青路面结构进行计算和验算,并分析了其用作高寒地区沥青路面基层的可行性。最后与水泥稳定碎石基层沥青路面做了对比。结果表明,孔隙率为15%的多孔混凝土作为高寒地区沥青路面基层,不仅能够起到排除路面内部水的功能,而且能够满足重载交通的需求。     

重载交通对沥青路面的影响分析

对重载交通的含义作了介绍,在充分认识重载交通危害的基础上,从多个角度分析了重载交通对沥青路面的影响,并从道路的设计及养护管理方面提出了防治措施,以减小重载车辆对路面的影响。     

重载交通沥青路面典型早期破损与成因分析

以国内几条典型的高等级公路沥青路面为例,依据路面现场普查和检测数据,分析总结了高等级公路沥青路面在重载交通条件下的典型早期破损类型,并重点从路面设计理论、轴载换算方面进行了成因分析,进而针对目前过渡阶段提出了对策和防治措施,并展望了今后路面研究需重点关注的几个问题,结论可为我国重载交通路面研究、设计施工提供参考。     

路面性能与交通安全的相关关系探讨

针对我国道路交通安全面临的严峻形势,分析了路面抗滑性能、平整度、车辙对交通安全的影响,证实了路面性能与交通安全的相关性,并提出路面性能评价的新理论、新方法,对提高道路交通安全有重要的意义。     

稀浆封层机在路面施工中的综合应用

从稀浆封层机自身结构特点与工作范围出发,对稀浆封层机在路面施工中的若干问题做了相关探讨,如稀浆封层机在路面下封层的施工要点以及相关注意事项;稀浆封层机在新型路面形式——半柔性路面施工中的可行性分析,指出稀浆封层机在今后的路面施工中将有更新的发展。     

Assessment of vibration serviceability for steel cable-stayed bridges using GNSS data

International Journal of Steel Structures - Assessment of deflection and vibration serviceability is important for flexible structures such as long-span bridges. The purpose of deflection criteria...