Research On The Analysis Method Of Exisiting High-piled Wharf Integral Safety Degree Basing On Structure’s Ultimate Bearing Capacity

During the service process of high-piled wharf structure, structural damage causedby environmental corrosion, poor management and the aging will affect the safety ofthe whole structure seriously. Facing the above problems, this paper establishes aneffective method to discriminate high-piled wharf structure’s security level, grasp thesafety status and avoid accident. This method which calculates the safety index ofstructure by JC-method can analyze the integral safety degree of high-piled wharf.Taking the ultimate bearing capacity of the structure (structural resistance) and theload (load action effect) as random variables, this method proposes a function whichreflects the integral safety degree of high-piled wharf.The main contents of this paper are summerised as follow:(1) Using the large universal finite element software ANSYS as a platform, thispaper establishes a nonlinear finite element model of high-piled wharf to analyze itsultimate bearing capacity. The paper analyzes the ultimate bearing capacity ofhigh-piled wharf under heaped load, portal crane load and vertical combination loadrespectively, and then verifies the accuracy of the models and the calculation results.(2) An automatic intelligent finite element analysis system program is written byAPDL language of ANSYS. To form the input sample which can acquire the ultimatebearing capacity of high-piled wharf, we sample the influence factors of ultimatebearing capacity. Then we get the ultimate bearing capacity sample of high-piledwharf under different conditions by FEM calculation.(3) Using the probability distribution testing method and sample statisticalanalysis method, the paper analyzes the ultimate bearing capacity of high-piled wharfunder different conditions respectively. The results show that the probabilitydistribution of the ultimate bearing capacity of high-piled wharf is normal distribution.The statistical parameters of different load conditions are also given.(4) On the basis of the structural reliability theory, this paper takes the ultimatebearing capacity of the structure and the load as random variables, and then proposesa function which reflects the integral safety degree of high-piled wharf. An iterativecalculation procedure to calculate the safety index of structure is written by MATLAB. According to the distributions and statistical parameters derived above, this paperestablishes an effective method to analyze the integral safety of high-piled wharfstructure.(5) A three-dimensional finite element model is built basing on the engineeringdata of a high-piled wharf in Tianjin Port. Its safety index is calculated by the methodproposed in this paper. This example fully shows the application process of thismethod and verifies the effectiveness of the proposed method.