N-Pad?A Three-Dimensional Program for the Analysis of Base-Isolated Structures

by Douglas Way, Base Isolation Consultants Inc, United States,
Van Jeng, Base Isolation Consultants Inc, United States,



Document Type: Proceeding Paper

Part of: Seismic Engineering: Research and Practice

Abstract:

N-PAD is a three-dimensional computer program especially written for the analysis of base-isolated structures. The program is designed with the ability to model various types of isolation systems, and has been compared with other similar programs. N-PAD computer results have also been compared with actual test results from shake-table tests at the Earthquake Engineering Research Center in Richmond, California. The program was successfully used for the analysis of the Foothill Communities Law and Justice Center (FCLJC), a $38-million facility located in San Bernardino and the first base-isolated building in the United States. The N-PAD program, which is designed to work in conjunction with SAP-81 introduces non-linear degrees of freedom at the base of an elastic superstructure.

Subject Headings: Three-dimensional analysis | Base isolation | Structural analysis | Computer analysis | Seismic design | Earthquake resistant structures | Structural design | United States | California

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