NEHRP Clearinghouse
- Title
- Hybrid Solution Techniques for Generalized Pseudodynamic Testing.
- File
- PB88179007.pdf
- Author(s)
- Thewalt, C. R.; Mahin, S. A.
- Source
- National Science Foundation, Washington, DC., July 1987, 145 p.
- Identifying Number(s)
- UCB/EERC-87/09
- Abstract
- Previous work on the pseudodynamic method has primarily considered simple planar structures subjected to a single horizontal component of base excitation. This has been generalized to consider arbitrary structural configurations subjected to a fixed base excitation with up to six components. Practical observations on implementing and operating a pseudodynamic test system are given based on experience gained in using the test system. An attempt is also made to specify criteria to be used to determine the reliability of results from a given test. A new formulation of the method that can be used to perform tests at or near real time is presented. This new technique uses force control, and would be useful in testing structures composed of rate sensitive materials where the conventional pseudodynamic method is not applicable. A new method is proposed that allows fully implicit integration methods to be used without requiring iteration or estimation of tangent stiffness properties. Verification tests showed that the method does give unconditional numerical stability as well as accurate results.
- Keywords
- Equations of motion; Control equipment; Pseudodynamic testing; Damping; Dynamic tests; Computer applications; Actuators; Earthquake engineering; Displacement; Reliability; Tests