高压输电线铁塔地震时程弹性数值模拟

Numerical simulation on seismic time-history elastane of high-voltage transmission tower

地震对高压输电线铁塔的安全性能有重要影响。通过建立高压输电线铁塔模型,采用有限元方法对受7级和8级地震影响的高压输电线铁塔的力学行为进行数值模拟与分析。计算结果表明:在地震作用下高压输电线铁塔t=3-4s时加速度最大,其应力也相应较大;在7级地震时最大应力值远小于材料的许可应力,高压输电线铁塔在7级地震过程中是安全的,但是8级地震时,最大应力值已经达到234MPa,超过Q345许可应力230MPa,高压线铁塔就处于不安全运行状态。

The safety performance of high-voltage transmission tower can be affected obviously by earthquake. With finite element method, the model of high-voltage transmission tower was established to study its strength and safety, which was affected by 7 magnitude earthquake and 8 magnitude earthquake. The numerical simulation results showed that the acceleration of high-voltage transmission tower is biggest at 3s-4s with earthquake, and at the same time the stress of tower is larger, with 8 magnitude earthquake the maximum stress value is much smaller than the material allowable stress, high-voltage transmission tower is safe. But with 7 magnitude earthquake the maximum stress value 234MPa is bigger than the allowable stress 230MPa of Q345, which may cause the high-voltage trans- mission tower in the state of unsafe operation.