海上测风塔整体耦合风荷载计算

Full-coupled Wind Load Calculation of Offshore Wind Measurement Mast

摘要: 风荷载是海上测风塔受到的主要荷载之一，其设计取值与测风塔的安全性、经济性密切相关。测风塔风荷载通常根据《建筑结构荷载规范》建立单独上部模型进行分析。为了更加真实地模拟测风塔风荷载，采用了测风塔上、下部整体耦合模型，通过数值方法进行分析，并与通常采用的规范估算方法进行对比。针对风荷载与结构自振频率之间的相互影响关系，提出了迭代求解风振系数的方法。通过对比分析计算，发现数值计算得出的风荷载量值比相同输入条件下规范法计算的结果小6%～26%。

Abstract: Wind load is one of the dominating loads for offshore wind measurement mast, whose applied amount relates closely to safety and economical efficiency. A traditional wind load model includes merely an isolated upper mast, and calculation is based on the standard of Load Code for the Design of Building Structures. To give a better simulation of wind load, a full-coupled model containing both the upper mast and lower foundation was built for numerical anslysis, then a comparison with code method was made. To deal with the close loop relationship between wind load and natural frequency, iteration was introduced to solve for wind vibration coefficient. Through comparison, it was found that with identical input, wind load calculated by mumerical method is 6%~26% smaller than those from code method.