The Seismic Category 1 Structures Program: Results for FY 1985
In FY 1985 a new effort was begun to resolve an issue that became the ''stiffness difference issue.'' This issue came about from reporting the results from testing both isolated shear walls and box-like shear deformation-dominated scale models that showed a consistent reduction in structural stiffness measured experimentally. This structural stiffness was different from that which would be calculated analytically at loads associated with operating basis earthquake levels. Several possible explanations were proposed for the experimental/analytical difference (most likely attributable to cracking of the concrete models). Possibilities are microcracking at very low loads, microconcrete effects, such as shrinkage cracks, unaccounted for dynamic effects in the analyses, and low stress level, low-cycle, fatigue degradation of microconcrete properties. A new configuration was proposed by the Technical Review Group (TRG) for this program and, in FY 1985, a prototype structure was designed. A 1/4-scale microconcrete model of the prototype structure was constructed and tested. This report details that investigation, but it does not report the resolution of the ''stiffness difference'' issue, an investigation that was ongoing at the end of FY 1985. 10 refs., 28 figs., 9 tabs.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5429704
- Report Number(s):
- NUREG/CR-4998; LA-11117-MS; ON: TI88002521
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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