Self-centering rocking steel bridge piers for seismic regions

该研究将引入预制后张式钢桥墩，不仅可以使结构更快地建造，而且可以帮助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，对这种自定心桥梁结构抗震性能的研究尚未见报道。这项研究将有助于通过广泛的非线性有限元模拟，通过准静态反向循环加载和振动台测试的实验室实验，对此类桥梁的行为进行正确的理解和认识。数值模拟和广泛的试验将进行，以确定不同的参数，包括钢的强度，尺寸，后张力和能量耗散特性的量对其行为的影响，以及设计要求。这将有助于我们为此类桥梁制定基于性能的设计指南，并将通过根据拟议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。这项研究源于之前NSERC与Rapid Span Group合作的一项研究资助，现在已转化为由加拿大钢结构研究所（CISC）、Rapid Span Group、Emil Anderson Construction （EAC）、Klohn Crippen Berger （KCB）和S-FRAME Software Inc.支持的为期四年的研究项目。该项目将协助工程师/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，确定适当的截面尺寸和连接细节，并提供设计指南。本研究项目的总体目标是填补在创造创新、快速、低成本和可靠的结构系统施工方面的重大全球空白。通过后张和创新的紧固装置连接的预制钢构件不仅可以使结构更快地建造，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。

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.