Self-centering rocking steel bridge piers for seismic regions

地震区自定心摇摆钢桥墩

• 批准号: 519909-2017
• 负责人: Alam, Shahria
• 金额: $ 4.08万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=690674
• 关键词: Self; centering; rocking; steel; bridge

The proposed research will introduce prefabricated post-tensioned steel bridge pier that will not only enable structures to be built faster but also help structures self-center after major earthquakes. Performance-based design is becoming a standard practice for seismic design and evaluation of structures in order to achieve a reliable and satisfactory level of performance. However, there has been no study on the seismic performance of such self-centering bridge structures. This research will help develop proper understanding and knowledge about the behavior of such bridges through extensive nonlinear finite element simulation, laboratory experiment through quasi-static reverse cyclic loading and shake table testing. The numerical simulations and extensive testing will be performed to determine the effect of different parameters including the steel strength, dimensions, amount of post-tensioning force and energy dissipator characteristics on its behavior, and the design requirements. This will help us develop performance-based design guideline for such bridges, which will be further validated by designing and fabricating steel bridge piers as per the proposed guideline and testing them on shake table. This study stems from a previous NSERC Engage grant pursued with Rapid Span Group, which is now translated into a four year research project supported by Canadian Institute of Steel Construction (CISC), Rapid Span Group, Emil Anderson Construction (EAC), Klohn Crippen Berger (KCB) and S-FRAME Software Inc. This project will assist engineers/practitioners in examining the interaction among different components of the bridge under lateral loads, and evaluate its limit states, and determine adequate section sizes and connection details and provide design guidelines. The overarching goal of this research project is to fill a major worldwide gap in creating innovative, rapid, low-cost and reliable construction for structural systems. The proposed prefabricated steel elements, connected through post-tensioning and innovative fastening devices will not only enable structures to be built faster but also help structures self-center after major earthquakes. This research will position Canada as a global leader in this field.

拟议的研究将引入预制后张法钢桥墩，不仅可以使结构更快地建造，而且有助于结构在大地震后自我中心。基于性能的设计正在成为结构抗震设计和评估的标准做法，以达到可靠和令人满意的性能水平。然而，目前还没有对这种自定心桥梁结构的抗震性能进行研究。本研究将通过广泛的非线性有限元模拟、室内试验、拟静力反复荷载试验和振动台试验，对这类桥梁的受力性能有更好的认识和认识。通过数值模拟和大量的试验来确定不同的参数，包括钢材强度、尺寸、后张力量和耗能器特性对其性能的影响，以及设计要求。这将有助于我们为这类桥梁制定基于性能的设计指南，并将通过根据建议的指南设计和制造钢桥墩并在振动台上进行测试来进一步验证。这项研究源于NSERC之前与Rapid Span Group共同实施的一项研究拨款，该项目现已转化为一个为期四年的研究项目，该项目由加拿大钢结构协会、Rapid Span Group、Emil Anderson Construction(EAC)、Klohn Crippen Berger(KCB)和S框架软件公司支持。该项目将帮助工程师/从业人员检查桥梁在横向荷载下不同组件之间的相互作用，评估其极限状态，并确定适当的截面尺寸和连接细节，并提供设计指南。该研究项目的总体目标是填补世界范围内在创新、快速、低成本和可靠的结构体系建设方面的重大空白。建议的预制钢构件，通过后张拉和创新的紧固装置连接起来，不仅可以更快地建造结构，还可以帮助结构在大地震后自我中心。这项研究将使加拿大在这一领域处于全球领先地位。