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Abstract:A large experimental program which involved approximately 700 tests was used to develop statistically reliable slip loads for bolted shear connections with coated contact surfaces. Four different painting systems were evaluated for use in friction-type connections. Variables included in the study were paint thickness, size of hole, type of steel, and magnitude of clamping force. An efficient and reliable slip test setup was developed to complete the research. Additional creep and fatigue tests on bolted butt splices were used to evaluate the suitability of the painting systems for bridges. Some large bolted connections were tested to evaluate the applicability of the single fastener slip test to multi-bolt connections. Ultimate load tests to determine the effect of undeveloped fillers on bolt shear strength and the interaction between bolt shearing stress and plate tensile stress are reported.
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