平面移动式立体车库运载系统载荷谱编制与应用
Compilation and Application of Load Spectrum for Planar Mobile Three-Dimensional Garage Transportation System
平面移动式立体车库容量大、形式多样,对车位分配的要求更高,载荷形式更加多样。因此在研究立体车库的载荷谱时,以平面移动式立体车库为代表进行研究,运用概率统计方法,结合车辆存取策略建立了适用于立体停车结构的交变载荷谱;之后,采用四点雨流计数法对载荷谱进行统计和边缘分布拟合。结果表明:载荷均值服从均值为9.876 kN、标准差为0.493 kN的正态分布;幅值服从形状参数为1.603、尺度参数为2.048的双参数Weibull分布。通过参数外推得到整个生命周期的载荷频次,而后建立了对应的8级二维载荷谱和一维载荷谱。基于Miner线性损伤准则,应用本文提出的载荷谱进行移动载荷下型钢柱-牛腿节点疲劳寿命预测,实际疲劳寿命符合假定,假定合理。
The planar mobile three-dimensional garage has a large capacity and diverse forms, with higher requirements for parking space allocation and more diverse load forms. Therefore, to study the load spectrum of a three-dimensional parking garage, a planar mobile three-dimensional parking garage was taken as a representative case. Probability and statistical methods were used to establish an alternating load spectrum suitable for three-dimensional parking structures based on vehicle access strategies. The four-point rain flow counting method was further used to statistically analyze the load spectrum and fit the marginal distribution. The results show that the mean load follows a normal distribution with a mean of 9.876 kN and a standard deviation of 0.493 kN. The amplitude follows a dual parameter Weibull distribution with a shape parameter of 1.603 and a scale parameter of 2.048. By extrapolating parameters, the load frequency of the entire life cycle was obtained, and corresponding 8-level two-dimensional load spectrum and one-dimensional load spectrum were established. Based on the Miner linear damage criterion, this paper applies the load spectrum to predict the fatigue life of steel column bracket joints under moving loads. The actual fatigue life is consistent with the assumption, demonstrating the reasonableness of assumption.
立体停车结构 / 车辆存取策略 / 交变载荷谱 / 雨流计数法 / 疲劳寿命预测 / 参数外推 / Miner线性损伤准则
three-dimensional parking structure / vehicle access strategy / alternating load spectrum / rain flow counting method / fatigue life prediction / parameter extrapolation / Miner linear damage criterion
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国家自然科学基金(51878261)
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