Study On Influence Of Beam-column Relative Stiffness On Mechanical Behavior Of Overhead Vertical Dock Structure

With the development of inland waterway,the structure of the wharf keeps emerging,and various structural have their unique mechanics characteristic and calculation methods.In practical engineering,designers always pay their attention to the reasonable structure with expected stiffness,so as to maximise the bearing capacity of wharf.This involves the optimization of the relative stiffness ratio of the wharf member.The reasonable beam-column relative stiffness can improve the bearing capacity and deformation capacity of the wharf structure,as a result,the seismic performance of the whraf structure is enhanced.Therefore,in this paper,the influence of the relative stiffness ratio on the mechanical behavior of a typical wharf structure is studied based on a typical overhead vertical Wharf.The main research contents are as follows:1.In this paper,the fist task is to collect and analyse relevent literatures about the research on the effect of reasonable relative stiffness ratio on structure,and review the structural seismic vulnerability and seismic risk assessment as well.and then put forward the deficiency of the present research,and outline the main contents of this paper.2.The numerical simulation method of each component of terminal structure is introduced in detail.The nonlinear calculation model of typical terminal structure is established by using OpenSees software,and the reliability of the finite element model is verified by the model test results.and the reliability of finite element model is verified by model test.3.Firstly,based on the theory of optimization and the theory of structural elasto-plasticity,the calculation theory of reasonable relative stiffness of the wharf structure is deduced under the condition of constant material dosage.The results show that the reasonable relative stiffness can enhance the lateral resistance of the structure.Then,based on the background of Chongqing orchard wharf structure,seven kinds of wharf structures with different height are designed Under the condition of constant total height of wharf.The bearing and deformation capacity of seven kinds of wharf structures under different ship impact loads are analyzed,and conclude with the optimal interlayer height of wharf structure.On the basis of the reasonable relative stiffness calculation theory,six beam with different sizes were designed by using the same amount of material.The bearing and deformation capacity of the wharf under six relative stiffness is calculated and analyzed,and the optimum relative stiffness range of the structure is determined.Finally,based on the above research results,the design of section size optimization design for the structure section of the wharf is carried out.4.In accordance with the seismic vulnerability analysis,seismic risk analysis method,seismic risk assessment theory,this paper proposes seismic analysis method of wharf structure which is rely on risk assessment;Chongqing Port Orchard wharf structure is took as the research background,the analysis of seismic performance of different storey wharf structure is commenced.The seismic fragility curves of each wharf structure are established,and the vulnerability characteristics of various wharf structures are compared;ultimitely,the seismic risk values and seismic performance of different storey wharf structures are evaluated,and the overhead vertical wharf with optimal seismic performance is selected.