NEHRP Clearinghouse
- Title
- On the Use of Simple Models in Nonlinear Dynamic Analysis.
- File
- PB300522.pdf
- Author(s)
- Pique, J. R.
- Source
- National Science Foundation, Washington, DC. Engineering and Applied Science., September 1976, 284 p.
- Identifying Number(s)
- R76-43
- Abstract
- An evaluation of simple models to predict the inelastic dynamic response of frames is presented. Two types of models were considered, a shear-beam model with the floor springs determined on the basis of an incremental static analysis, and an equivalent one-degree-of-freedom system resulting from the same analysis. Three heights of frames were studied, a four-story frame designed by UBC, three ten-story frames (one designed by UBC, Anderson's frame, and Kamil's frame). Analyses were performed under EL Centro 1940 (N-S) earthquake for different intensities and Taft (N69W). The simple models can provide a reasonable approximation to the response with largest discrepancies of the order of 27%. Solutions obtained with the equivalent single-degree-of-freedom system are comarable to those of the shear-beam model, or even better for the four- and ten-story frames. For the teller structure, however, the response deteriorates slightly. Changes in motion intensity did not seem to alter the degree of accuracy of the response; neither did the different ground motions. The structural responses were, however, very different for the two earthquakes.
- Keywords
- One degree of freedom; Earthquake resistant structures; Framed structures; Seismic waves; Degrees of freedom; Ground motion; Earthquake engineering; Elastic properties; Nonlinear systems; Earthquakes; Dynamic structural analysis