Abstract
Assessing the seismic performance of the gantry crane is significant since the structure is more vulnerable to earthquakes with the increase in size and lifting weight capacity. This paper aims to investigate the seismic response of the gantry crane incorporating near-field ground motions using incremental dynamic and endurance time analysis (IDA and ETA) methods. To model the structure accurately, a nonlinear finite element model of the gantry crane considering the viscoelastic effect is developed in the OpenSees platform. Then, the IDA method is also carried out for a comparison with the ETA method. The results of the two methods are consistent with a correlation of 93.9% while the computational demand of the ETA method is much less than those of the IDA method. To study further, both the seismic incident angle and the application of viscous dampers using the Maxwell model are analyzed and discussed in detail. The results show that seismic incident angle has a distinct influence on the maximum seismic displacement and viscous dampers can significantly reduce the seismic demand of the gantry crane. These findings support the seismic design of gantry cranes and evaluate the structural seismic performance efficiently.
Highlights
With the increase of manufacturing and consumption worldwide in the past decades, modern gantry cranes with increasing span and lifting weight have been more commonly designed to elevate large components or structures at the factory, the wharf, or the container freight station
The performance-based earthquake engineering (PBEE) technique is adopted to predict structural behavior and achieve various performance objectives [13]. ere are dozens of procedures for the analysis of structures subjected to seismic excitation [14, 15], such as pushover analysis (POA) [16], time-history analysis (THA) [17, 18], incremental dynamic analysis (IDA) [19, 20], endurance time analysis (ETA) method [21,22,23], and so on. e ETA method is a dynamic pushover analysis in which the structure is subjected to an intensifying acceleration and its seismic performance can be judged based on the time duration
A specified demand measure (DM) is used to evaluate the structure performance quantificationally. e results obtained in ET analysis are compared with those in the IDA analysis. en, the most critical seismic incident angle is studied to achieve a better understanding of the structural characteristics
Summary
With the increase of manufacturing and consumption worldwide in the past decades, modern gantry cranes with increasing span and lifting weight have been more commonly designed to elevate large components or structures at the factory, the wharf, or the container freight station It means the modern gantry cranes are more sensitive to natural hazard, especially earthquake. E ETA method is a dynamic pushover analysis in which the structure is subjected to an intensifying acceleration and its seismic performance can be judged based on the time duration. E FE models of a typical gantry crane are developed in the OpenSees software, and specific demand measures for the gantry crane are defined in Section 3; en, 20 near-field seismic waves are chosen based on the template spectrum response, which is used in the IDA procedure. The conclusions are drawn as references for the future design of gantry cranes
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