摘要
给出了规范设计中确定载荷组合系数的一种新方法 .不同于 FBC模型及泊松模型 ,载荷用一般的平稳随机过程模拟 .利用 Grigoriu的非高斯载荷过程的平均上通率的一阶泊松近似 ,确定单个载荷及组合载荷的特征值 ,其中组合载荷过程的任一时点分布用最大熵原理近似估计 .分析了不同载荷之间的相关性对组合系数的影响 ,对具有不同概率分布类型载荷的组合进行了数值分析 .最后该方法应用到波浪载荷与风载荷的组合 ,数值结果表明了方法的有效性 .
A new method was developed for determining load combination coefficient in codified design. The emphasis is to evaluate the effect of the correlation between loads on load combination coefficients. Different from Ferry-Borges Castanheta and Possion models used widely in codified design, the loads are modeled by stationary stochastic processes. Adopting Grigoriu's mean upcrossing rate of the first-order Possion approximation of non-Gaussian process, the characteristic value are determined for individual loads and load combinations, in which the maximum entropy principle is employed to estimate the instantaneous probability density function of a load combination. The effects of the correlation between different load processes are investigated on the load combination coefficients defined by the companion approach. Numerical examples are provided for the combinations of different kinds of load processes with different instantaneous probability density function. Finally, the method was applied for the combination of wind and wave load processes. The validity of the method is demonstrated by the numerical results.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2001年第10期1433-1437,共5页
Journal of Shanghai Jiaotong University
基金
船舶工业国防科技应用
基础研究基金项目( 98J40 .3.32 )
