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A hybrid pseudodynamic testing platform for structural engineering research: Application for the development of an innovative retrofit scheme .

机译：用于结构工程研究的混合伪动力测试平台：在创新改造方案开发中的应用。

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摘要

The objective of this study is to develop an integrated hybrid Pseudodynamic (PSD) testing platform that can be utilized to evaluate the behavior of subassemblies, building, bridges, and various infrastructures under earthquake, dynamic or static loads, avoiding some of the problems associated with shake table tests or pure computer modeling methods. Explicit and implicit algorithms that have been employed or proposed by other researchers in PSD testing are reviewed and evaluated in this study in terms of their numerical stability, accuracy, and error-propagation characteristics. The improved alpha-method is employed in the current testing platform owing to its characteristics of unconditional stability, sufficient accuracy, and having been verified experimentally.; A pre-testing simulation computer program is developed in this study. In this pretesting simulation program, the restoring force of the virtual experimental substructure is calculated using ABAQUS instead of reading the value from physical tests. The pretesting simulations for six representative cases were performed, showing that simulation results were consistent with the analytical solutions obtained through the finite element analysis program ABAQUS.; The current testing platform is developed in an object-oriented C++ framework architecture. The entire testing platform was verified experimentally by performing a series of physical tests of SDOF and MDOF systems. Two computers were used in the tests of MDOF systems. The two computers were used to control the physical test of the experimental specimen, and numerical modeling of the analytical substructure. A solution for data exchange between the two computers was developed and was verified experimentally. A series of PSD tests were performed to investigate the effects of the convergence tolerance, initial elastic stiffness, and selection of reduction factor. The test results indicate that the effects due to these parameters are related to the input excitation energy. The larger the input energy is, the smaller are such effects. A start-restart procedure is embedded in the current testing platform to handle unexpected situations that could occur during tests.; A 3-story special concentrically braced frame was tested utilizing the PSD testing platform developed in this study. The current testing platform was further verified experimentally by performing the PSD testing of a realistic building with special buckling-enhanced braces developed as part of this study. The special buckling-enhanced brace consists of an inner core steel double angle and outer pipes strapped to the angle with industrial steel straps. The braces in the first story of the building were tested physically while the rest of the building was modeled using ABAQUS. The buckling capacity of the special buckling-enhanced braces was found to be nearly 33% larger than that of standard double angle braces.
机译：这项研究的目的是开发一个集成的混合伪动态（PSD）测试平台，该平台可用于评估子组件，建筑物，桥梁和各种基础设施在地震，动态或静态载荷下的行为，避免了某些与之相关的问题。摇表测试或纯计算机建模方法。在这项研究中，就其数值稳定性，准确性和错误传播特性，对其他研究人员已经采用或提出的显式和隐式算法进行了审查和评估。改进的α方法由于其无条件的稳定性，足够的准确性以及已通过实验验证的特性而被用于当前的测试平台。在这项研究中开发了预测试模拟计算机程序。在此预测试模拟程序中，使用ABAQUS计算虚拟实验子结构的恢复力，而不是从物理测试中读取值。进行了六个代表性案例的预测试模拟，表明模拟结果与通过有限元分析程序ABAQUS获得的解析解一致。当前的测试平台是在面向对象的C ++框架体系结构中开发的。通过执行SDOF和MDOF系统的一系列物理测试，对整个测试平台进行了实验验证。在MDOF系统的测试中使用了两台计算机。这两个计算机用于控制实验样品的物理测试和分析子结构的数值建模。开发了用于两台计算机之间的数据交换的解决方案，并进行了实验验证。进行了一系列的PSD测试，以研究会聚公差，初始弹性刚度和折减系数的选择的影响。测试结果表明，由于这些参数引起的影响与输入激励能量有关。输入能量越大，这种影响越小。当前测试平台中嵌入了一个启动-重新启动过程，以处理测试期间可能发生的意外情况。利用本研究开发的PSD测试平台对3层特殊的同心支撑框架进行了测试。通过使用本研究开发的带有特殊屈曲支撑的现实建筑进行PSD测试，对当前的测试平台进行了实验验证。特殊的屈曲加强型支架由一个内芯钢双角钢和一个与工业钢带捆绑成该角钢的外管组成。对建筑物第一个楼层的支撑进行了物理测试，而建筑物的其余部分使用ABAQUS建模。发现特殊屈曲矫正器的屈曲能力比标准双角矫正器的屈曲能力大将近33％。

著录项

  • 作者

    Wang, Zhengquan.;

  • 作者单位

    University of Cincinnati.;

  • 授予单位 University of Cincinnati.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 250 p.
  • 总页数 250
  • 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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