基于ANSYS二次开发冷却塔施工全过程风致极限承载性能研究

Wind-induced limit bearing capacity in the whole construction process for a cooling tower based on ANSYS secondary development

为研究施工全过程中冷却塔风致强度和稳定极限承载性能,首先基于UIDL和APDL对ANSYS进行相应功能的界面化模块二次开发,在此基础上进行智能化有限元建模,通过分别施加规范与风洞试验风荷载,进行施工全过程中冷却塔强度及屈曲失稳极限承载能力计算,且考虑对比了混凝土龄期变化对屈曲稳定性的影响。结果表明:临界风速在冷却塔施工初始阶段迅速降低后渐趋平稳,整体风致强度极限承载能力要显著大于屈曲失稳极限承载能力,计入龄期变化后冷却塔屈曲模态与不计时相似,但临界风速相对减小;对比各施工阶段不同工况下的两种承载能力发现最小临界风速为100.7 m/s,远大于当地50年一遇最大设计风速29.7 m/s。算例分析表明本文二次开发的冷却塔结构智能化分析模块实用高效,实现了冷却塔施工全过程极限承载能力有限元分析的参数化和可视化。

In order to investigate wind-induced limit bearing capacity of strength and stability in the whole construction process for a cooling tower.ANSYS secondary development of corresponding function interface module by using UIDL and APDL was conducted,based on which an intelligent finite element model was built.Wind tunnel and standard wind load were imposed on it.Wind-induced limit bearing capacity of strength and bulking instability in the whole construction process was calculated.The effects of concrete age change on buckling stability were then compared.It is founded that the critical wind speed of the cooling tower decreases rapidly in the initial stage of construction,and then gradually becomes smooth.Wind-induced limit bearing capacity of strength is larger than the wind-induced limit bearing capacity of bulking instability.With including concrete age change,the buckling mode is similar to the result without considering concrete age change,but the critical wind speed decreases.The overall minimum critical wind speed is 1 00.7 m /s,far more than the maximum,wind speed of fifty years in the local（29.7 m /s）.The results demonstrate that the cooling tower structure intelligent analysis module of secondary development is practical and efficient.Parametric and visual finite-element analysis of limit bearing capacity in the whole construction process for the cooling tower has been realized.