Abstract
In this study, the seismic response of a container crane under near-field and far-field ground motions was investigated using a shaking table test on a 1/20 scale crane. The 1/20 scale crane was designed and fabricated based on the similitude laws, in which three independent quantities: geometric length, acceleration, and elastic modulus, were used to design the 1/20 scale crane. A series of shaking table tests were conducted at the Seismic Research and Test Center, Pusan National University, Yangsan Campus to evaluate the seismic response of the scale crane under near-field and far-field ground motions. The results show that the near-field ground motions can cause larger internal forces (that is, axial force and two bending moments) in the landside and seaside legs and larger portal drift than the far-field ground motions. The portal drift of the container crane subjected to the near-field ground motions was 43% higher than that of the container crane subjected to the far-field ground motions. Furthermore, when subjected to the near-field ground motion, the bending moment in the crane’s portal leg was 37% higher than the bending moment when the crane was subjected to the far-field ground motions.
Highlights
Container cranes are special equipment widely used at seaports to transfer containers between ships and harbors
The analyses show that the internal force of the near-field earthquake (Gazli USSR Iran earthquake) was higher than that of the far-field earthquakes (Nahanni Canada and Mineral Virginia earthquakes) for all of the observed locations
One near-field (Gazli USSR Iran) and two far-field (Nahanni Canada and Mineral Virginia) ground motions were matched to the elastic response spectrum (Z1S4_2400) and applied to the scale crane in the trolley-boom girder direction
Summary
Container cranes are special equipment widely used at seaports to transfer containers between ships and harbors. In past studies conducted by various researchers, the two methods used to evaluate the seismic response of a container crane are the finite element method on a prototype container crane and the shaking table test of a scale container crane. For the shaking table test, various authors evaluated the seismic response of a container crane by using 1/50, 1/25, 1/20, 1/15, 1/10, and 1/8 scale crane models [8,9,10,11,12,13]. Jin [8] used the similitude law to make a 1/50 scale container crane and studied its seismic response under vertical component earthquakes using a shaking table test. One near-field, Gazli USSR Iran, and two far-field ground motions, Nahanni Canada, and Mineral Viginia earthquakes, were matched to a Korean elastic design response spectrum. The acceleration time history of the adjusted ground motions was applied in the trolley-boom direction to investigate the seismic response of the scale container crane in terms of the internal forces in the landside and seaside legs, drift of the portal frame, and acceleration
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