大直径钢管塔地震响应研究

Research on the seismic responses of large diameter steel tube towers

以大直径钢管为结构主体的钢管塔是一种很有发展潜力的新型塔．大直径钢管是一种空间薄壁壳体，其结构分析设计与传统的杆系塔架不同．而可供参考的资料很少．本文在静力分析和抗风设计的基础上．结合具体工程研究了钢管塔地震作用的分析方法，采用空间壳体有限单元法．完成了钢管塔地震作用的时程分析．数值算例表明．一般情况下钢管塔地震作用较相应的风荷载要小，塔顶位移和塔底应力均由风荷载控制，但地震作用下塔顶的加速度较风荷载作用下的要大，当塔上设有对加速度敏感的仪器设备时．应采取必要的措施．

The large diameter steel tube tower is one of the new type towers. Since a large diameter steel tube must be treated as a thin-walled shell, the structural analysis and design are uite different from that of the conventional towers, and little information is available. Based on the static analysis and wind resistant design, the time history analysis of seismic response of the tower are studied. Numerical results of a real project indicate that in common circumstances the earthquake effect on large diameter steel tube towers is obviously smaller than the wind effect. The displacements at tower top and the stresses at tower bottom are controlled by wind load. But the acceleration at tower top may be controlled by the earthquake excitation. If the apparatus on the tower top is sensitive to acceleration, some measures must be adopted.