In order to study the variation law of cable forces of a low-pylon cable-stayed bridge under the double action of cable damage and earthquake,the finite element beam lattice model of a low-pylon cable-stayed bridge was established by using software Midas Civil.The influence of cable damage in different quantities and positions on the dynamic characteristics of the bridge was studied,and the variation law of cable forces under the double action of earthquake and cable damage was further analyzed.The results show that the damage of the outer side span and the middle part of the middle span cable tower has a great influence on the natural vibration frequency of the structure.With the increase of the damage degree of the cable,the change rate of the natural frequency of the structure is also increasing,and the change between them is basically linear;Single cable breakage will have a regular impact on the cable force of the remaining cables of the low tower cable-stayed bridge.The maximum value of the cable force change rate generally appears in the cable adjacent to the broken cable,and the farther from the broken cable,the smaller the cable force change rate,but the cable force change rate is basically kept within 10％;In the process of increasing cable damage,there is an extreme value,which makes the change rate of residual cable force on both sides of the extreme value change linearly with the change of cable damage.
关键词
矮塔斜拉桥/有限元分析/拉索损伤/自振频率/地震作用/索力变化规律
Key words
short tower cable-stayed bridge/finite element analysis/cable damage/natural vibration frequency/earthquake action/change law of cable force
维普
万方数据