Deformation Hazard Curves for Development of Seismic Risk Maps for Bridges

用于开发桥梁地震风险图的变形风险曲线

• 批准号: 418528-2013
• 负责人: Lin, Lan
• 金额: $ 1.75万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=636427
• 关键词: Deformation; Hazard; Curves; Development; Seismic

The main goal of the proposed research program is to develop a new methodology for the seismic vulnerability assessment of bridges. The methodology is based on the use of deformation hazard curves, which represent the mean annual probabilities of exceedance of different deformation levels (from elastic deformations to collapse). The deformation hazard curves have significant advantages compared with the fragility curves that are currently used. Namely, the deformation hazard curves cover all the responses that the bridge might experience during its lifespan, and include the effects of the seismic hazard at the bridge location. The responses are quantified by a selected single global deformation parameter, and the seismic hazard at the bridge location is represented by the annual probability of exceedance of different levels of an intensity measure. The deformation parameter and the intensity measure are key parameters in the methodology, and special investigations are proposed for the selection of these parameters.The methodology for the development of deformation hazard curves will provide a new and reliable approach for the seismic vulnerability evaluations of bridges. The guidelines describing the step-by-step procedure for the use of the methodology, which will be developed as part of this Proposal, will enable a wide use of the methodology by researchers in academia as well as by engineering analysts in design offices. The methodology will be developed in a general form and can be used in any country around the world. However, in the context of this Proposal, the application of the methodology for the seismic vulnerability evaluation of bridges in Canada is of special importance. The deformation hazard curves for bridges, developed based on the proposed methodology, can be used for ranking the bridges according to their vulnerability, and consequently for the development of seismic risk maps for bridges. In addition, the proposed methodology will be very beneficial for the improvement of the seismic provisions of the Canadian Highway Bridge Design Code.

拟议的研究计划的主要目标是开发一种新的桥梁地震易损性评估方法。该方法是基于使用的变形危险曲线，代表不同的变形水平（从弹性变形到崩溃）的平均每年的概率。与目前使用的脆性曲线相比，变形危险曲线具有明显的优势。也就是说，变形危险曲线涵盖了桥梁在其使用寿命期间可能经历的所有响应，并包括桥梁位置处的地震危险的影响。通过选定的单个全球变形参数量化响应，并通过不同强度措施的年度概率来表示桥梁位置的地震危险性。该方法中的变形参数和烈度指标是关键参数，并对这些参数的选取进行了专门研究，为桥梁结构地震易损性评估提供了一种新的可靠的方法。将作为本建议书的一部分制定的指导方针描述了使用该方法的逐步程序，将使学术界的研究人员以及设计办公室的工程分析人员能够广泛使用该方法。该方法将以一般形式制定，可在世界任何国家使用。然而，在本提案的范围内，加拿大桥梁地震易损性评估方法的应用具有特殊重要性。基于所提出的方法开发的桥梁的变形危险曲线，可用于根据其脆弱性对桥梁进行排名，从而为桥梁的地震风险图的开发。此外，所提出的方法将是非常有益的，以改善加拿大公路桥梁设计规范的抗震规定。