Abstract. Portal crane is an important port production machinery what frequently work in moist environment leads to greater structural damage. The weight of the metal structure is usually 60% to 90% of the whole weight. Steel Q235B material in the early is widely used in the portal crane design and manufacture. For more than a certain number of service life period of portal crane, it is necessary to do safety assessment to reflect their state of health. The traditional safety assessment cannot reflect the structure of the health portal crane vibration state, therefore, vibration testing was added to the portal crane fault diagnosis technology in the present study, which use ambient vibration modal analysis to test a portal crane, and acquired abnormal vibration signals, it is improve the safety assessment system, achieved the good test results.
Abstract. In this paper, a shipbuilding gantry crane serviced for up to 18 years is studied; the strain-measuring method is used for testing and analyzing the response of the structure and the load about the main force component-cylindrical structural. By arranging the measuring point 90°to each other on the cylindrical section of the maximum bending moment, the rule of stress conditions of cylinder is established. The results showed that: when the crane lifting, the same side in the cylinder has the maximum compressive stress, which mapped side has the maximum tensile stress, the stress of both sides of the vertical part is minimum; When the rotating mechanism run a week, the same section of the cylinder will show a cyclical linear change with the rotation angle of the boom (jagged cyclical changes).
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