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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Numerical Models And Ductile Ultimate Deformation Response Of Post-tensioned Self-centering Moment Connections
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Numerical Models And Ductile Ultimate Deformation Response Of Post-tensioned Self-centering Moment Connections

机译：后张自定心矩连接的数值模型和延性极限变形响应

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摘要

New steel moment-resisting connections that incorporate post-tensioning elements to provide a self-centering capacity and devices to dissipate seismic input energy have recently been proposed and experimentally validated. Experimental studies have confirmed that these connections are capable of undergoing large lateral deformations with negligible residual drifts. To facilitate their implementation, accurate modeling of the behavior of systems incorporating post-tensioned connections must be readily available to designers and researchers. A number of simplified models have been suggested in the literature by researchers trying to capture experimental results at the beam-column connections and thereby to predict the global response of structures incorporating such connections. To provide a clear set of guidelines for the modeling of post-tensioned steel frames, for practicing engineers as well as researchers, in this paper three types of numerical models of increasing complexity are presented: (ⅰ) a sectional analysis procedure, (ⅱ) a lumped plasticity spring frame leveled approach and (ⅲ) a non-linear solid finite element analysis to predict the response at ultimate deformation levels. The analytical results obtained from the numerical models predict well the structural behavior of these connections when compared with available experimental data. Even at the ultimate deformation level, analytical results are in good agreement with test results. Furthermore, detailing requirements are proposed to assure that flexural hinges form in the beams in order to improve the cyclic response of steel self-centering connections when drifts exceeding the design drifts are imposed to the system. Experimental and analytical studies demonstrate that steel post-tensioned self-centering connections incorporating the proposed detailing in the beams develop an increased deformation capacity and thereby exhibit a ductile response while avoiding a sudden loss of their strength and stiffness.
机译：最近已经提出并通过实验验证了新的钢制抗力矩连接，其结合了后张紧元件以提供自定心能力，并具有消散地震输入能量的装置。实验研究已经证实，这些连接能够承受较大的横向变形，而残余漂移可以忽略不计。为了促进其实现，设计人员和研究人员必须容易获得包含后张紧连接的系统行为的准确建模。研究人员在文献中提出了许多简化的模型，这些模型试图捕获梁柱连接处的实验结果，从而预测包含这种连接的结构的整体响应。为了为工程师和研究人员提供清晰的后张张钢框架建模指导，本文提出了三种类型的数值模型，它们的复杂性不断提高：（ⅰ）截面分析程序，（ⅱ）集中塑性弹簧框架水平法和（and）非线性固体有限元分析，以预测极限变形水平下的响应。与可用的实验数据相比，从数值模型获得的分析结果可以很好地预测这些连接的结构行为。即使在极限变形水平，分析结果也与测试结果非常吻合。此外，提出了详细的要求，以确保在梁上形成挠性铰链，以在将超过设计偏差的偏移量施加到系统时，改善钢自定心连接的循环响应。实验和分析研究表明，在梁中结合拟议中的细节的后张预紧钢自定心连接具有增强的变形能力，从而表现出延性响应，同时避免了强度和刚度的突然损失。

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