共查询到18条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
以南京某文化中心项目为基础,针对大跨屋架结构的健康监测系统数据处理方法,进行了深入的研究与应用。分析了结构监测点的布置原则,并结合项目实际情况,合理地布置了温度、位移、应变传感器。基于健康监测系统,进行了数据的传输和获取,并设定了数据预警阈值。最后对采集的数据进行分析,发现数据变化平稳,结构处于安全状态。 相似文献
5.
大跨斜拉桥结构健康监测系统数据处理方法研究 总被引:3,自引:0,他引:3
为了对大跨桥梁结构健康监测系统运行中可能采集到的各类海量监测数据作出及时响应,需要对监测数据进行科学的统计、归纳及必要的相关性分析.基于目前大多数大型健康监测系统数据采集能力远优于其数据表现能力的情况,全面的后台数据采集及精炼的前台数据表现能力共同决定了大型健康监测系统的科学指导价值.归纳大跨斜拉桥监测数据的用途及处理方式,并以某桥梁健康监测系统为研究对象,给出该系统针对海量数据的处理办法,同时指出对于其目前数据表现能力的改进建议. 相似文献
6.
一、桥梁结构健康检测的必要性
自20世纪50年代以来,桥梁健康检测的重要性就逐渐被认识,但受检测、监测手段比较落后的限制.在应用上一直未能得到推广和重视。近年来,随着大跨径桥梁的轻柔化及形式与功能的复杂化,该项技术成为国内外学术界,工程界的研究热点。许多国家都在一些已建和在建的大跨桥梁上进行了有益的尝试。 相似文献
7.
《Planning》2017,(12)
由于跨度长,外形优美,特大型悬索桥已成为大桥建设的首选结构。悬索桥一般由箱梁、主缆、吊索构成,每种结构都承载着不同的荷载,这些结构构件在长期的荷载作用下会产生结构损伤,对这些关鍵构件进行结构健康监测,有助于发现结构损伤,对大桥的管理运营具有重要的参考价值。文章对实际运营的桥梁箱梁、主缆以及吊索的振动进行了监测,对其监测数据进行了分析和评估,有助于及时判断桥梁的结构健康状态。 相似文献
8.
大型桥梁结构智能健康监测系统集成技术研究 总被引:49,自引:0,他引:49
首先分析研究了桥梁健康监测系统的各个子系统的功能、特点、实现方法与硬软件系统,研究了完成桥梁健康监测任务对各个子系统协同工作的要求。提出了以LabW indows/LabVIEW为桥梁健康监测系统的核心软件,由它“指挥”、调用和驱动各个子系统的运行和数据的交互与通讯;以数据管理子系统的数据库作为桥梁健康监测系统的中心数据库,它不仅存储桥梁结构及其监测数据的全部信息,同时所有的数据交互均通过该数据库完成。建议采用B rower/Server系统模式将桥梁结构健康监测的各子系统相互结合,建立基于网络平台的开放式的实时在线智能健康监测系统。最后,为一座实际的三塔斜拉桥集成了一套健康监测系统。 相似文献
9.
10.
11.
桥梁管理局已经认识到,对大型桥梁实行长期结构健康监测的意义在于保证结构和运行安全,发出损坏和老化的早期预警可以避免昂贵的维修甚至灾难性的坍塌。对大型桥梁建立长期监测系统,一方面是在桥梁正常使用期内评估结构完整性、耐久性、可靠性的信息,制定最佳的维护计划,保证安全运行。 相似文献
12.
《Structure and Infrastructure Engineering》2013,9(9):829-845
This paper presents the reliability analysis approach of long-span cable-stayed bridges based on structural health monitoring (SHM) technology. First, the framework of structural reliability analysis is recognised based on SHM. The modelling approach of vehicle loads and environmental actions and the extreme value of responses based on SHM are proposed, and then models of vehicle and environmental actions and the extreme value of inner force are statistically obtained using the monitored data of a cable-stayed bridge. For the components without FBG strain sensors, the effects and models (extreme values) of dead load, unit temperature load, and wind load of the bridge can be calculated by the updated finite element model and monitored load models. The bearing capacity of a deteriorated structure can be obtained by the updated finite element model or durability analysis. The reliability index of the bridge's critical components (stiffening girder in this study) can be estimated by using a reliability analysis method, e.g. first order reliability method (FORM) based on the models of extreme value of response and ultimate capacity of the structure. Finally, the proposed approach is validated by a practical long-span cable-stayed bridge with the SHM system. In the example, reliability indices of the bridge's stiffening girder at the stage after repair and replacement after 18 years of operation, and the damaged stage are evaluated. 相似文献
13.
14.
大跨缆索支承型桥梁健康监测与评估系统的设计研究 总被引:2,自引:0,他引:2
随着我国经济迅速发展,对于交通运输能力的要求不断提高,结构健康监测(Structural Health Monitoring,SHM)系统越来越成为大型桥梁运营、养护管理、安全评估与维护的重要技术支撑。本文针对目前国内外大跨桥梁结构健康监测系统中存在的问题,围绕“结构健康监测、日常养护检测系统、周期检测相结合,综合建立大跨桥梁结构状态识别与安全评估系统”的思想,主要就建立大跨缆索支承型桥梁结构健康监测系统中的问题进行了研究,提出了明确的系统的总体设计原则、构成以及功能目标,对系统设计与安全评估目标的关系问题进行了分析研究,阐述了监测项目选择、传感器子系统、数据采集与传输子系统、数据处理与控制子系统、结构状态识别与安全评估子系统的设计原则或思路。 相似文献
15.
Structural parameter identification and damage detection for a steel structure using a two-stage finite element model updating method 总被引:1,自引:0,他引:1
J.R. Wu 《Journal of Constructional Steel Research》2006,62(3):231-239
A two-stage eigensensitivity-based finite element (FE) model updating procedure is developed for structural parameter identification and damage detection for the IASC-ASCE structural health monitoring benchmark steel structure on the basis of ambient vibration measurements. In the first stage, both the weighted least squares and Bayesian estimation methods are adopted for the identification of the connection stiffness of beam-column joints and Young’s modulus of the structure; then the damage detection is conducted via the FE model updating procedure for detecting damaged braces with different damage patterns of the structure. Comparisons between the FE model updated results and the experimental data show that the eigensensitivity-based FE model updating procedure is an effective tool for structural parameter identification and damage detection for steel frame structures. 相似文献
16.
17.
18.
An efficient method for reliability assessment of long span steel arch bridges against wind-induced stability failure is presented in this paper. The prediction of wind-induced stability of such bridge structures is performed by an eigenvalue method and the reliability estimates are determined by a generalized first-order reliability algorithm. A software strategy for interfacing the present method with ANSYS is developed via a freely available MATLAB software tool (FERUM). A numerical example involving a detailed computational model of a long span steel arch bridge with a main span of 550 m is presented to demonstrate the applicability and merits of the present method and the software strategy. Finally, the most influential random variables on the reliability of long span steel bridges against wind-induced stability failure are identified by a sensitivity analysis. 相似文献