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框架预应力锚杆边坡支护结构抗震简化设计方法

, PP. 38-46

Keywords: 道路工程,边坡支护结构,抗震设计,框架预应力锚杆,地震土压力,动力稳定性

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Abstract:

？为了能够准确地进行框架预应力锚杆边坡支护结构动力分析及抗震设计,通过对该类结构进行震害分析,推导出地震作用下动土压力计算公式,建立了框架预应力锚杆支护结构的动力计算模型,并采用力法进行了求解。基于建立的动力分析模型和震害模式,给出了其抗震设计方法。考虑了地震响应沿坡高放大效应,根据极限平衡理论和破坏模式建立了框架预应力锚杆边坡支护结构的动力稳定性验算模型。将提出的方法应用于工程实例,并用有限元法进行了对比分析。结果表明:提出的分析模型具有较高的精度,是一种简单、实用的分析与设计方法|地震作用下最危险截面发生在边坡中偏上部位|梁柱截面尺寸是延性设计和发生斜压破坏的主要控制因素。

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