Self-centering rocking steel bridge piers for seismic regions

拟议中的研究将引入预制后张钢桥墩，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。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，目前还没有研究这种自定心桥梁结构的抗震性能。通过大量的非线性有限元模拟、准静态反向循环荷载试验和振动台试验，本研究将有助于正确理解和了解此类桥梁的行为。将进行数值模拟和广泛的测试，以确定不同参数的影响，包括钢的强度，尺寸，后张力和能量衰减器的特性，其行为和设计要求。这将有助于我们为此类桥梁制定基于性能的设计指南，并将通过按照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。这项研究源于之前的NSERC Engage资助与Rapid Span Group合作，现在被转化为一个为期四年的研究项目，由加拿大钢结构研究所（CISC），Rapid Span Group，Emil安德森建筑（EAC），Klohn Crippen Berger（KCB）和S-FRAME软件公司支持。本项目将协助工程师/从业人员检查桥梁不同部件在横向荷载下的相互作用，并评估其极限状态，确定适当的截面尺寸和连接细节，并提供设计指南。该研究项目的总体目标是填补世界范围内的重大空白，为结构系统创造创新，快速，低成本和可靠的施工。拟议的预制钢构件通过后张拉和创新的紧固装置连接，不仅能够更快地建造结构，而且还有助于结构在大地震后自我中心。这项研究将使加拿大成为这一领域的全球领导者。

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.