基于横系梁数量变化的双柱式墩地震易损性分析

Seismic Vulnerability Analysis of Double Column Piers Based on Variation of Transverse Beam Number

为了研究横系梁的设置数量对双柱墩的抗震性能的影响,运用基于传统可靠度的直接回归概率需求模型分析双柱式墩的地震易损性.结果表明:在横桥向地震动输入的激励和相同损伤状态下,易损性曲线会在地震动加速度峰值PGA的某一数值下发生交叉;当PGA小于交叉点加速度峰值时,双柱式墩所对应的超越概率随着墩柱间横系梁的设置数量的增加而减小;当PGA大于交叉点加速度峰值时,超越概率随着墩柱间横系梁的设置数量增加而增大.

In order to study the influence of the number of transverse beams on the seismic performance of double-column pier, the seismic vulnerability of double-column pier was analyzed using the direct regression probability demand model based on traditional reliability. The results show that in the excitation and same damage state of the cross-bridge to the seismic ally input, the vulnerability curve will cross under a certain value of the seismically active acceleration peak (PGA) of the seismic intensity index, and when the PGA value is less than the peak of cross-point acceleration, the overtaking probability corresponding to a double-pillar edgy decreases with the increase of the number of settings of the cross-beam between the columns, and when the PGA value is greater than the peak of the acceleration of the intersection, the overtaking probability of transcendence increases with the increase of the number of cross beams between pier columns.