三方纤绳桅杆最大位移的作用风向

Wind direction on maximum displacement of three-way guyed mast

三方纤绳桅杆在不同方向的风载作用下所产生的风效应是不同的.前苏联的Г.А.萨维茨基曾得出风向与纤绳平面夹角为60°时的杆身节点位移要比0°时大一倍的结论.因此,在工程设计中,杆身内力和纤绳拉力由0°风向控制,节点水平位移计算则取60°风向.本文通过桅杆结构矩阵位移法的计算实例,表明水平位移也是由0°风向控制.从而纠正了过去三方纤绳桅杆的最大位移的作用风向,简化了计算程序,保证了桅杆结构的可靠性.纠正后的三方纤绳桅杆定型设计,经过近30年的国内外大量工程实践,证明是安全、正确的.

The wind effect of three-way guyed mast is different under the action of wind load at different direction. The pre-Soviet Union Г.А.Cавицкий drew a conclusion that the joint displacement of angle 60°between wind direction and guy wire′s plane is one time larger than that of 0°. Therefore, in practical design, the internal force of the mast and guy is controlled by 0°wind direction while the joint horizontal displacement is calculated by 60°. In this paper, through numerical examples of the mast structure used by matrix displacement method, it is shown that the horizontal displacement is also controlled by 0°wind direction. Thus the traditional wind direction of maximum displacement of three-way guyed mast is corrected and the process of calculation and guaranteeing the reliability of mast structure is simplified. A large number of domestic and international projects about 30 years proves that the finalization design of three-way guyed mast with the revised theory is safe and correct.