OSMS 86-03

"Building Records from 1984 Morgan Hill Earthquake"

by M.J. Huang, A.M. ASCE, A.F. Shakal, R.W. Sherburne and R.V. Nutt, M. ASCE

Huang, M.J., A.M. ASCE, A.F. Shakal, R.W. Sherburne and R.V. Nutt, M. ASCE (1986). Building Records from 1984 Morgan Hill Earthquake from Third ASCE Speciality Conference on Dynamic Response of Structures, UCLA, March 31 - April 2, 1986.

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The dynamic response of 23 structures instrumented by the California Strong Motion Instrumentation Program was recorded during the magnitude 6.2 (ML) Morgan Hill earthquake of 24 April 1984. The structures range in complexity from a single-story warehouse to a 13-story office building. The number of acceleration sensors in the structures varied from 6 to 22, depending on structural complexity and specific measurement objectives. As an example, the Santa Clara County Office Building in San Jose was instrumented with a total of 22 sensors configured to record foundation rocking and the translational as well as torsional motion on five of the 13 stories .

The strong motion records from seven buildings and one bridge have been digitized and processed. Maximum horizontal ground accelerations at the buildings were in the range 0.03 - 0.11 g; maximum roof accelerations were 0.17 - 0.41 g. Processing of the digitized data indicates that the maximum horizontal displacements at roof level ranged from 1 to 19 centimeters. Significant structural response lasted for less than 35 seconds for most buildings. However, the (steel-frame Santa Clara County Office Building had significant response for about 80 seconds. The records from this structure and from a single-story warehouse of tilt-up construction are considered in some detail in this paper.