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Page count: 16

Lateral load tests were performed on four 4-ft-diameter drilled piers extending through water bearing granular overburden and terminating in shale bedrock. Depth of overburden varied from 10 to 43 ft. The tests involved piers with both bell and socket bases. Electric resistance strain gages were used to measure strains at the reinforcing steel, and furnished data from which bending moments were determined. It was concluded that: (1) drilled piers are capable of resisting lateral loads of large magnitude, (2) soil embedment is very effective in attenuating moments caused by lateral loads, (3) bell and socket bases effectively resist lateral loads for short drilled piers terminating in rock, (4) lateral load resistance of long drilled piers is not influenced by the base conditions, and (5) cyclic loading causes deflections to double and moments to increase 20 to 50 percent, approximately, compared to the values for the first cycle of load.