求翻译：本文采用弹塑性纤维梁柱单元来考虑某大跨刚构桥的非线性地震响应，该桥桥墩为圆端中空截面，而目前国内对中空矩形截面墩、圆端中空截面墩的抗震延性能力研究甚少，作者参考日本桥梁抗震规范分别计算了沿切向和沿径向的约束混凝土有效侧向应力，从而采用Mander本构模型定义了墩身的材料非线性特性，并通过考虑行波效应和不考虑行波效应得到了该桥在罕遇地震下较为合理的响应。是什么意思？

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