Dynamic Environment Simulation by Pulse Techniques

The capability for simulating the response of structures to transient dynamic loading is useful for testing structural adequacy, for evaluating mathematical models, and for investigating the response of equipment in a structure. An analytical and experimental investigation of the use of mechanical pulse generators to determine the characteristics of massive structures and to simulate continuous dynamic environments applicable to such structures is described. Theoretical, criterion response is computed. A method is presented for determining the optimized pulse train convenient for experimental application. Experimental measurements obtained from a 200,000-lb (92,000-kg) structure are used to generate specifications for pulse simulation of earthquake ground motion. These pulse specifications are shown to be physically practical. Results of in-place tests of the 200,000-lb (92,000-kg) structure by pulse techniques compare favorably with theoretical predictions.