Structural Health Monitoring in Performance Based Design of Bridges

基于性能的桥梁设计中的结构健康监测

• 批准号: RGPIN-2019-04574
• 负责人: Ventura, Carlos
• 金额: $ 3.79万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=749440
• 关键词: Structural; Health; Monitoring; Performance; Based

The goal of this research is to incorporate Structural Health Monitoring (SHM) procedures into the Performance-based Design (PBD) of bridges. This will help bridge designers ensure that any bridge designed according to the provisions of the Canadian Highway Bridge Design Code (CHBDC) meets the specified performance criteria in the code. The 2014 edition of the CHBDC mandates performance based seismic design (PBD) for design of lifeline and major route bridges in seismic zones. This design approach is a more promising substitute to the traditional force based design approach permitted in the previous editions of the code. The basic premise of the PBD is to achieve multiple performance objectives defined in terms of serviceability conditions and structural damage at multiple hazard levels. Bridges must meet certain performance objectives defined in terms of tolerated structural damage and serviceability objectives, at three hazard levels of 10%, 5%, and 2% in 50 years' probabilities of exceedance. Nonlinear time history analysis is recommended by the code to assess the damage performance objectives. While the design approach is already required by the code, several challenges still exist for successful implementation of the envisioned requirements. There is clearly a need to facilitate the implementation of the CHBDC performance based design approach, and there are many ways to achieve this. One of these is to incorporate the knowledge of past performance of bridges, mainly from monitoring programs and lessons learned from extreme events, as part of the design procedure and help reduce the uncertainty associated with nonlinear time history analysis to predict the extent of damage, and how this damage could affect the safety of the structure. SHM procedures can be implemented as soon as a bridge has been built to verify that the bridge is performing as was expected when it was designed. It is proposed to implement in the SHM procedures Data Science methods using recorded past performance of bridges. This will help predict with higher confidence the expected performance of a bridge under extreme loads and to determine if the expected damage is within the accepted PBD criteria. To accurately determine the reliability of a structure based on diagnostic results, it is important to determine the probability of underestimating the severity of damage which causes structural failure. Methods for determining the probability distribution of occurrence of true damage need to be developed. It is also envisioned that these procedures could be used to address the issues of damage quantification and damage prognosis. The results of this research will contribute to make SHM a reliable and efficient tool for assessing the safety of structures subjected to strong ground shaking and for ensuring that a bridge designed using PBD can meet the expected performance objectives specified in the CHBDC.

本研究的目标是将结构健康监测(SHM)程序纳入基于性能的桥梁设计(PBD)中。这将帮助桥梁设计者确保根据加拿大公路桥设计规范(CHBDC)的规定设计的任何桥梁都满足规范中规定的性能标准。2014年版CHBDC要求基于性能的抗震设计(PBD)用于地震区生命线和主干道桥梁的设计。这种设计方法是一种更有前途的替代传统的基于力的设计方法，该方法在以前的规范版本中是允许的。PBD的基本前提是实现在多个危险等级下的适用性条件和结构损伤方面定义的多个性能目标。桥梁必须满足根据结构损伤容限和使用性能目标定义的特定性能目标，在超过50年的概率中，达到10%、5%和2%三个危险水平。规范建议采用非线性时程分析方法来评估结构的损伤性能指标。虽然代码已经需要这种设计方法，但要成功实现预期的需求，仍然存在一些挑战。显然有必要促进基于性能的CHBDC设计方法的实施，有许多方法可以实现这一点。其中之一是将桥梁过去的性能知识(主要来自监测程序和从极端事件中吸取的教训)作为设计程序的一部分，并帮助减少与非线性时程分析相关的不确定性，以预测损伤程度，以及这种损伤可能如何影响结构的安全。一旦桥梁建成，就可以实施SHM程序，以验证桥梁是否按设计时的预期运行。建议在结构健康监测程序中实施数据科学方法，利用记录的桥梁过去的性能。这将有助于更有把握地预测桥梁在极端荷载下的预期性能，并确定预期损伤是否在可接受的PBD标准之内。为了根据诊断结果准确地确定结构的可靠性，重要的是确定低估了导致结构失效的损伤严重程度的概率。需要开发确定发生真实损伤的概率分布的方法。还可以设想，这些程序可用于解决损害量化和损害预测问题。这项研究的结果将有助于使舒适法成为一种可靠和有效的工具，用于评估结构在强烈地面震动下的安全性，并确保使用PBD设计的桥梁能够满足CHBDC规定的预期性能目标。