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首页> 外文学位 >Reliability-based performance-based design of rectangular concrete-filled steel tube (RCFT) members and frames.
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Reliability-based performance-based design of rectangular concrete-filled steel tube (RCFT) members and frames.

机译：基于可靠性的基于性能的矩形混凝土钢管（RCFT）构件和框架设计。

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摘要

A computational study was conducted to develop a reliability-based performance-based design methodology for three-dimensional composite frames consisting of steel girders and braces framing into RCFT beam-columns. A new mixed finite element formulation was developed to simulate the geometrically and materially nonlinear response of both RCFT beam-columns and steel members. The RCFT beam-column element was derived with 18 degrees-of-freedom to account for the differential slip displacement between the steel tube and the concrete core. The interface of the steel tube and concrete core comprised a layer of nonlinear springs allowing shedding of force between the two media. Comprehensive constitutive relations were derived to model the material inelasticity of the steel tube, concrete core, and the steel and concrete interface under random cyclic loadings. A corresponding formulation was developed for hot-rolled wideflange members to enable modeling of braced and unbraced composite frame structures. The constitutive relations were calibrated and verified with respect to experimental tests in the literature to account for key nonlinear phenomena such as bond breakage at the interface, cracking and confinement of concrete core, residual stress distributions, hardening, and local buckling of cold-formed steel tubes and hot-rolled steel members. The accuracy of the mixed finite element formulation along with the material constitutive relations were tested through analyzing a series RCFT and hot-rolled steel specimens from the literature and comparing the computational and experimental response parameters. The verification results confirm that the mixed finite element formulation has the capability of producing realistic simulations for RCFT beam-columns, hot-rolled steel girders, and RCFT frames subjected to three-dimensional static or transient dynamic loading. The mixed finite element formulation was then utilized to perform demand assessment and capacity assessment studies of RCFT frames. For this purpose, a series of RCFT frames were designed according to the up-to-date design specifications. Utilizing nonlinear time history analysis, the demand and capacity of these structures were quantified, documenting the key response parameters critical for composite structures. The dispersions in the analysis results due to randomness and uncertainties were then evaluated to derive the demand and capacity factors to implement performance-based design of RCFT frames within a reliability framework.
机译：进行了一项计算研究，以开发基于可靠性的基于性能的设计方法，该方法适用于由钢梁和支撑成RCFT梁柱的三维复合框架。开发了一种新的混合有限元公式，以模拟RCFT梁柱和钢构件的几何和材料非线性响应。 RCFT梁柱单元的自由度为18，以说明钢管和混凝土芯之间的滑移差异。钢管和混凝土芯的界面包括一层非线性弹簧，可以使两种介质之间的力消散。推导了全面的本构关系，以模拟钢管，混凝土芯以及随机循环荷载作用下的钢与混凝土界面的材料无弹性。为热轧宽法兰构件开发了相应的配方，以能够建模支撑和非支撑复合框架结构。根据文献中的实验测试对本构关系进行校准和验证，以解决关键的非线性现象，例如界面处的粘结断裂，混凝土芯的开裂和约束，残余应力分布，硬化和冷弯型钢的局部屈曲管和热轧钢构件。通过分析文献中的一系列RCFT和热轧钢试样并比较计算和实验响应参数，测试了混合有限元公式的准确性以及材料的本构关系。验证结果证实，混合有限元公式能够对承受三维静态或瞬态动态载荷的RCFT梁柱，热轧钢梁和RCFT框架进行逼真的仿真。然后将混合有限元公式用于RCFT框架的需求评估和容量评估研究。为此，根据最新的设计规范设计了一系列RCFT框架。利用非线性时程分析，对这些结构的需求和容量进行了量化，记录了对于复合结构至关重要的关键响应参数。然后评估由于随机性和不确定性导致的分析结果中的离散度，从而得出需求和容量因素，以在可靠性框架内实施基于性能的RCFT框架设计。

著录项

  • 作者

    Tort, Cenk.;

  • 作者单位

    University of Minnesota.;

  • 授予单位 University of Minnesota.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 401 p.
  • 总页数 401
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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