| In recent years,with the proposal of "The Belt and Road" in China and the rapid development of the world’s shipping industry,container cranes tend to be large as the main equipment for container handling in ports.The increasingly active seismic activity in the world makes the impact of larger cranes on the seismic performance of the port during earthquake not to be ignored.There is a certain disparity between the requirements on the seismic performance of port engineering and the current seismic design.In order to better deal with the safety problems that the crane-wharf interaction system may face during earthquakes,it is necessary to study the seismic performance of pile-supported wharf considering the effect of crane in more systematic and detailed ways.Based on the above,a three-dimensional numerical model of crane-wharf interaction is established based on open-source Open Sees computation platform for a typical cranewharf interaction system.Firstly,the natural vibration characteristics of crane and the influence of pile foundation characteristics on seismic response of pile-supported wharf are analyzed.Secondly,the static and dynamic responses of the pile-supported wharf with and without crane are analyzed.Finally,a global sensitivity analysis is carried out for pile-supported wharf with and without crane by using the Sobol sequence sampling method combined with the Gaussian process model.The specific research contents are as follows:(1)The natural vibration characteristics of crane and the influence of pile foundation characteristics on seismic response of pile-supported wharf are analyzed.The crane is reasonably simplified and assumed.Then,a three-dimensional finite element model of crane is established and its natural vibration characteristics are obtained by modal analysis.The numerical model of pile-supported wharf with multiple structural sections is established.The influence of concrete compressive strength,steel yield strength,steel elastic modulus,and the combined effect of concrete compressive strength and steel yield strength on seismic performance of pile-supported wharf are analyzed.(2)The static and dynamic responses of pile-supported wharf with and without crane are analyzed.A three-dimensional numerical model of crane-wharf interaction system is established.The influence of crane on the response of pile-supported wharf under static and dynamic loading is analyzed in detail,and the response of pile foundation at different elevations and typical times is explored.(3)Global sensitivity analysis of seismic response of pile-supported wharf is performed.Based on the Sobol sequence sampling method and the Gaussian process model,the global sensitivity analysis of pile-supported wharf with and without crane is carried out.The sample points of sensitive parameters are generated by the Sobol sequence sampling method,and the corresponding target response is obtained by numerical simulation of the sample points one by one,and the input-output dataset of for every sample point is obtained.The relationship between the target response and the sensitivity parameters is approximated by the Gaussian process model.The first-order sensitivity index and the total sensitivity index are calculated,and the influence of each parameter on the target response is comprehensively evaluated.The above work has theoretical significance and application value for the study of seismic response and technology of crane-wharf interaction system,and can provide a reference for the numerical simulation of similar system. |
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