以大型通用有限元软件ANSYS为平台,建立了高桩码头结构整体极限承载力分析的非线性有限元数值模型。将蒙特卡洛方法与有限元数值模型相结合,求取出堆载下高桩码头结构整体极限承载力的概率分布及其统计参数。以结构整体极限承载力(结构抗力)和作用荷载(作用效应)为随机变量,构建反映高桩码头结构整体安全度的功能函数,采用JC法计算结构的安全指标,建立了高桩码头结构整体安全度分析的有效方法。研究了堆货荷载下高桩码头结构损伤与尺寸型式改变对极限承载力样本概率分布与统计参数的影响,得出了堆载下高桩码头结构极限承载力概率分布为正态分布,结构损伤与尺寸型式改变对其统计参数影响不大的结论。计算表明,利用此法分析堆货荷载下高桩码头结构整体安全度简便且可行。
Using the large universal finite element software ANSYS as a platform, a nonlinear finite element model of high-piled wharf was established to analyze its ultimate bearing capacity in this paper. The probability distribution of ultimate bearing capacity of high-piled wharf under heaped load and its statistical parameter were obtained by combination of the Monte Carlo method and the finite element numerical model. A effective method was also established to analyze the integral safety degree of high-piled wharf, which could calculate the safety index of structure by using JC-method. This method proposed a function reflected the integral safety degree of high-piled wharf by taking the ultimate bearing capacity of the structure (structural resistance) and the load (load action effect) as random variables. The probability distribution of ultimate bearing capacity of high-piled wharf was analyzed under heaped load. The impact of probability distribution and statistical parameters of ultimate bearing capacity of the damage, the changes of the structure's sizes and type were considered. The results show that the probability distribution of the ultimate bearing capacity of high-piled wharf under heaped load are normal distribution and its statistical parameter is not affected by the damage, the size, or the type change of the structure. The calculation shows that it is simple and feasible to analyze the integral safety of high-piled wharf by using this method.