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Influence of the Gravity System on the Seismic Performance of Special Steel Moment Frames

机译：重力系统对特殊钢弯矩框架抗震性能的影响

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摘要

This study investigates the influence of the gravity load resisting system on the collapse performance of Special Steel Moment Frames (SMFs). The influence was quantified using the FEMA P-695 methodology. The buildings used for this study were a 2-, 4- and 8-story SMFs taken from the ATC76-1 project where their collapse performance was already evaluated without the gravity system. The main work of this dissertation has been divided in two parts. The first part studies the influence of the gravity system when it is incorporated explicitly as part of the lateral resisting system. Aspects of the gravity frame that were investigated include the contribution of stiffness and strength of beam to column connections, and the location of splices in the gravity columns. Moreover, this research investigates the potential for the development of inelastic deformations in the gravity columns, and the effect of such deformations on structural response. The results show that gravity connections and gravity column's continuity profoundly affect the computed response and collapse probability. The inelastic behavior in gravity columns has a less important effect but should be included in the analysis.;The second part of the investigation looks more in depth at the role of the gravity columns on the collapse performance of SMFs. Using the 2-, 4- and 8-story SMFs, the gravity columns are incorporated using the approach where all the gravity columns are lumped into one elastic, pinned at the base and continuous element. The approach is first validated by checking different aspects such as: strength of gravity connections to induce yielding into gravity columns, difference between the explicit and lumping column approach, and required gravity column's splices to provide continuity. The stiffness of the element representing the gravity columns was varied in order to find the influence of the gravity columns. At the end of the study it was found that they have a significant influence on the collapse performance of SMFs, especially on taller structures like the 8-story model. Moreover it was concluded that an adequate stiffness of the gravity columns could be found by performing nonlinear static pushover analysis.
机译：这项研究调查了重力载荷抵抗系统对特殊钢矩框架（SMF）倒塌性能的影响。使用FEMA P-695方法量化了影响。本研究使用的建筑物是ATC76-1项目中的2层，4层和8层SMF，在没有重力系统的情况下已经评估了它们的倒塌性能。本文的主要工作分为两个部分。第一部分研究了重力系统作为横向阻力系统的一部分而明确纳入时的影响。研究的重力框架的各个方面包括梁的刚度和强度对柱连接的贡献以及接头在重力柱中的位置。此外，这项研究调查了重力柱中非弹性变形发展的可能性，以及这种变形对结构响应的影响。结果表明，重力连接和重力柱的连续性深刻影响了计算响应和倒塌概率。重力柱的非弹性行为影响较小，但应包括在分析中。研究的第二部分深入探讨了重力柱对SMF坍塌性能的作用。使用2层，4层和8层SMF，将重力柱合并在一起，方法是将所有重力柱集中到一个弹性体中，并固定在基础和连续单元上。首先通过检查不同方面来验证该方法，例如：重力连接的强度以诱导屈服到重力柱中，显式和集总柱方法之间的差异，以及需要重力柱的接头以提供连续性。改变表示重力柱的单元的刚度，以便发现重力柱的影响。在研究结束时，发现它们对SMF的倒塌性能具有重要影响，尤其是对像8层模型这样的较高结构而言。此外，得出的结论是，通过进行非线性静力推覆分析可以找到重力柱足够的刚度。

著录项

  • 作者

    Solano, Francisco Xavier Flores.;

  • 作者单位

    Virginia Polytechnic Institute and State University.;

  • 授予单位 Virginia Polytechnic Institute and State University.;
  • 学科 Civil engineering.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 372 p.
  • 总页数 372
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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