Abstract
While the container crane is an important part of daily port operations, it has received little attention in comparison with other infrastructures such as buildings and bridges. Crane collapses owing to earthquakes affect the operation of the port and indirectly impact the economy. This study proposes fragility analyses for various damage levels of a container crane, thus enabling the port owner and partners to better understand the seismic vulnerability presented by container cranes. A large number of nonlinear time-history analyses were applied for a three-dimensional (3D) finite element model to quantify the vulnerability of a Korean case-study container crane considering the uplift and derailment behavior. The uncertainty of the demand and capacity of the crane structures were also considered through random variables, i.e., the elastic modulus of members, ground motion profile, and intensity. The results analyzed in the case of the Korean container crane indicated the probability of exceeding the first uplift with or without derailment before the crane reached the structure’s limit states. This implies that under low seismic excitation, the crane may be derailed without any structural damage. However, when the crane reaches the minor damage state, this condition is always coupled with a certain probability of uplift with or without derailment. Furthermore, this study proposes fragility curves developed for different structural periods to enable port stakeholders to assess the risk of their container crane.
Highlights
Container ports in seismically active regions all over the world are vulnerable to severe damage from earthquakes
The fragility function represents the ability of a system to withstand a Fragility analyses, known as fragility curves, are representations of conditional probability specified event, and can be expressed as that indicate the probability of exceeding a pre-defined level of damage as subjected to an input seismic intensity parameter [12]
This study focused on the time-history acceleration analysis of a typical modern jumbo container crane, as well as the methodology of the fragility curve development
Summary
Container ports in seismically active regions all over the world are vulnerable to severe damage from earthquakes. Fragility assessment for the container crane has not been widely studied. Three two-dimensional (2D) numerical models of American cranes, i.e., J100, LD100, American cranes, i.e., J100, LD100, and LD50, were considered with overall limit states obtained in andterms. LD50,ofwere considered with overall Based limit states obtained in terms of and critical portal deformations. Korean container crane was used in the fragility analyses. The damage or limit states were defined in terms of portal crane was used in the fragility analyses. The contacts between the crane’s toes and the wharf/rails were simulated by isolator elements of SAP2000 (a finite element software package of Computers and Structures Inc., Berkeley, California, United States), which allow capture of the uplift and derailment behavior.
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