Abstract: In order to study the fragility of hollow thin-walled reinforced concrete high-pier commonly used in highway bridges under near-field waves, a real rectangular hollow thin-walled reinforced concrete with the height of 90 m is taken as the research object. To obtain the maximum curvatures of the high-pier section, an incremental dynamic analysis is carried by using the software OpenSees by considering of the randomness of the pier and the randomness of the near-field waves. The critical curvature values of the pier sections are chosen as the damage indexes, and the seismic fragility and plastic hinge analysis of the high-pier is conducted. The results show that the variation law of the critical curvature values of the high-piers sections in longitudinal direction and transvers direction is great difference along the height direction of the pier. The probability of the complete injury is small when the seismic waves input direction is the longitudinal and the transvers of the bridge respectively. Both the bottom area and the middle and upper area of the high-pier are easily damage and formed plastic hinges when the near-field seismic waves input along the longitudinal direction of the bridge. Only the bottom area is easily damage and formed plastic hinges when the near-field seismic waves input along the transvers direction of the bridge, and the damage probability of the middle and upper area of the high-pier is small. The distribution area and length of plastic hinge of the reinforced concrete high-pier will be underestimated by only considered the randomness of the near-field waves.

Key words: bridge engineering, reinforced concrete high-pier, near-field seismic waves, seismic fragility, plastic hinge, damage probability

摘要： 为研究公路桥梁中常用的空心薄壁钢筋混凝土高墩在近场地震作用下的易损性，以某高度为90 m的矩形空心薄壁钢筋混凝土高墩为研究对象，考虑桥墩本身随机变量和近场地震波的随机性，通过OpenSees软件进行增量动力非线性分析获得截面曲率响应最大值，并以墩身截面临界曲率值作为损伤指标，进行高墩地震易损性和塑性铰分析。研究结果表明：沿墩身高度方向，各截面顺桥向和横桥向临界曲率值的变化规律差别较大；高墩在顺桥向和横桥向近场地震动输入时发生严重损伤的概率均较小，顺桥向近场地震动输入时，墩底和墩身中上部区域均容易损伤并形成塑性铰，而横桥向近场地震动输入时，仅墩底区域最容易损伤形成塑性铰，墩身中上部区域的损伤概率较小；仅考虑近场地震波的随机性确定钢筋混凝土高墩塑性铰的形成区域时，会低估近场地震动作用下高墩塑性铰的分布区域和长度。

关键词: 桥梁工程, 钢筋混凝土高墩, 近场地震波, 地震易损性, 塑性铰, 损伤概率