The Earthquake Engineering Online Archive

Earthquake engineering research at Berkeley

UCB/EERC-69/01, Earthquake Engineering Research Center, University of California, Berkeley, 1969-01, 228 pages (400/E17/1969)

At the Fourth World Conference on Earthquake Engineering held January 13-18, 1969, in Santiago, Chile, 14 papers were presented by members of the Earthquake Engineering Research Center. Five papers are concerned mainly with experimental research. Two of these papers propose programs of experimental research in earthquake engineering. The first describes research programs that might be conducted by means of shaking tables and the second describes a research program to investigate the behavior of steel beam-to-column connection subassemblages. The other papers on experimental work deal with the reliability of steel beam-to-column connections under cyclic loading, the damping capacity of a model steel structure, and the pore-water pressures in earth slopes under seismic loading conditions. Six of the 9 analytical papers employ the finite element method to analyze complex structures under earthquake loading. The finite element method is used in the analysis of earth dams, soil deposits, foundation-structure interaction, reservoir-dam systems, dam-foundation interaction, and shell roofs. Two analytical papers deal with particular problems in the design of buildings. One paper presents an approximate method of analyzing irregularly shaped buildings for earthquake loading. The other presents a method for predicting the deterioration of stiffness of reinforced concrete beams under cyclic loading and discusses the implications of such deterioration for reinforced concrete frames under earthquake loading. The final paper presents a nondeterministic analysis of nonlinear structures under earthquake excitation.

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