悬挂式轨道梁Y型墩柱抗震能力分析

Seismic Capacity of Suspension Track Beams with Y-shaped Pier Columns

为研究悬挂式轨道梁在无车情况下的抗震能力,以某悬挂式轨道交通试验线为研究对象,利用MIDAS/CIVIL建立模型并采用反应谱法,研究不同地震峰值加速度(0.1 g、0.15 g、0.2 g、0.3 g、0.4 g)对Y型墩柱的影响。研究结果表明:该桥横向刚度较小;相较于横向地震,Y型墩柱在顺桥向地震作用下的内力响应更大;当地震加速度大于0.1 g时,4号混凝土墩柱开始出现裂缝;当地震加速度大于或者等于0.25 g时,3号混凝土墩柱开始出现裂缝;在所讨论的地震峰值加速度中,Y型钢墩和混凝土墩柱均未出现屈服现象,但混凝土墩柱弯矩增长速率更快,有先屈服的趋势。

To study the seismic resistance of suspended track beams in the absence of vehicles,a suspension rail transit test line was used as the research object.The model was established using MIDAS/CIVIL,and the response spectrum method was applied to study the effect of different earthquake intensities(0.1 g,0.15 g,0.2 g,0.3 g,and 0.4 g)on a Y-shaped pier column.The results showed that the lateral stiffness of the bridge is smaller and the Y-shaped pier column has a greater internal force response under the action of an earthquake in the bridge direction compared with that when subjected to lateral earthquakes.When the seismic acceleration is greater than 0.1 g,the fourth concrete pier column begins to crack,whereas when the seismic acceleration is greater than or equal to 0.25 g,the third concrete pier column begins to crack.In the seismic peak acceleration discussed,neither the Y-shaped steel pier nor the concrete pier column yields,but the bending moment of the concrete pier column grows faster and it has a tendency to yield first.