CAJ | 학술논문

　　为确定舞动荷载作用下杆塔受力及破坏模式，分别建立了500 kV舞动事故线路段连续7档导线—绝缘子模型和塔线体系模型，采用驻波法作为导线舞动激励，计算了不同工况下的导线张力、挂点不平衡张力和垂直荷载。当耐张塔两侧导线不发生一阶舞动时，导线舞动幅值相对较小，产生的纵向不平衡张力小于设计规范规定的断线张力，耐张塔不会发生破坏。发生一阶舞动时，不平衡张力超过断线张力取值，舞动相横担下截面斜材首先会出现应力超限情况，从而导致横担发生破坏，分析确定的铁塔破坏模式与现场破环形式一致。塔线模型与导线—绝缘子模型计算得到的导线张力和不平衡张力峰值较为接近。双挂点塔线模型计算得到的横担主材轴力与单塔模型基本一致，斜材轴力相差约0.2%、8%和2%。
　　위학정무동하재작용하간탑수력급파배모식，분별건립료500 kV무동사고선로단련속7당도선—절연자모형화탑선체계모형，채용주파법작위도선무동격려，계산료불동공황하적도선장력、괘점불평형장력화수직하재。당내장탑량측도선불발생일계무동시，도선무동폭치상대교소，산생적종향불평형장력소우설계규범규정적단선장력，내장탑불회발생파배。발생일계무동시，불평형장력초과단선장력취치，무동상횡담하절면사재수선회출현응력초한정황，종이도치횡담발생파배，분석학정적철탑파배모식여현장파배형식일치。탑선모형여도선—절연자모형계산득도적도선장력화불평형장력봉치교위접근。쌍괘점탑선모형계산득도적횡담주재축력여단탑모형기본일치，사재축력상차약0.2%、8%화2%。
In order to determine the failure modes under galloping loads, FEA models of the conductor-insulator system and the tower-line system were established for a 500kV line section with galloping disasters. Under the excitations of the standing waves from galloping conductors, the conductor tension as well as the unbalanced tension and the vertical loads at the suspensions points were calculated. The axial forces of the tower members were analyzed. If the first order galloping mode does not occur at the two adjacent spans of a tensioned tower, the galloping amplitudes are relatively small. The longitudinal unbalanced tension is usually lower than the broken tensions used in the tower design code, and the tensioned tower will not be destroyed. When the first order galloping mode occurs, the unbalanced tension is higher than the tension of broken conductor. Stress of the diagonal member at the bottom plane of the cross arm firstly exceeds the design value, which causes the failure of the cross arm. The failure mode determined by the analysis is coincident with the real state. Peak values of the conductor tensions and the unbalanced tensions by the tower-line system model are close to the conductor-insulator model. The axial force of the main member of the cross arm is basically consistent with that calculated by the tower-line system model with two suspension points and the tower model, and the axial forces of the diagonal members have the differences of 0.2%, 8%and 2%separately.