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Seismic Analysis and Parametric Study for a Continuous Seven Spans Post-tensioned Bridge in Quito, Ecuador

机译：厄瓜多尔基多连续七跨后张桥的地震分析和参数研究

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A continuous post-tensioned bridge over seven spans, 27m each, was recently designed and iscurrently under construction in Quito, Ecuador. Located in one of the most activeseismic/volcanic regions of South America, several challenges were faced during the bridgedesign. In addition to the limits on the deck horizontal displacement because of the adjacentbuildings, a substructure system of circular columns without pier-caps or framing connectionsinto the deck was adopted to satisfy the required vertical clearance. Consequently, the post-yieldbehaviour of pier reinforcement could not be allowed as a hysteretic energy dissipation systemsince the formation of plastic hinges at such piers impairs not only the control over deckdisplacement but also the stability of the bridge deck. A response spectrum analysis was firstconducted on a three dimensional finite element model (3D-FEM) in order to study therelationship between superstructure, bearings, substructure and foundations as well as to obtain apreliminary design of bridge components. Thereafter, a non-linear time history analysisaccompanied by a parametric study was carried out considering different types of base isolationbearings. The study emphasized that the interaction between the superstructure and substructurethrough the bearings is a major key to achieve the target level of energy dissipation, base shear,and deformations. Herein, the FEM, seismic analysis, as well as the part of the conductedparametric study for a flat sliding friction/spring type of bearings are presented.
机译：最近设计了一座连续跨后张桥，横跨7个跨度，每个跨度27m。 目前正在厄瓜多尔基多市建设。位于最活跃的地区之一 南美的地震/火山地区，在桥梁建造过程中面临着一些挑战 设计。除了由于相邻的甲板水平位移的限制 建筑物，没有墩帽或框架连接的圆柱的子结构系统 进入甲板，以满足所需的垂直间隙。因此，后收益率 滞后耗能系统不允许墩墩加固的行为 因为在这样的码头处形成塑料铰链不仅损害了对甲板的控制 位移还可以保证桥面甲板的稳定性。首先是响应频谱分析 为了研究三维有限元模型（3D-FEM） 上层建筑，轴承，下部结构和地基之间的关系以及获得 桥梁构件的初步设计。之后，进行非线性时程分析 考虑到不同类型的碱基隔离，进行了参数研究 轴承。研究强调，上部结构与下部结构之间的相互作用 通过轴承是达到目标能量消耗水平，基础剪切力的主要关键， 和变形。在此，有限元分析，地震分析以及进行的部分 提出了用于滑动滑动摩擦/弹簧类型轴承的参数研究。

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