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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。
In order to accurately carry out the dynamic analysis and seismic design of the prestressed anchor slope support structure, through the seismic damage analysis of this type of structure, the formula of earth moving pressure under the action of earthquake is deduced, and the framework prestressed anchor support Structure of the dynamic calculation model, and the force method was used to solve. Based on the established dynamic analysis model and earthquake damage mode, the seismic design method is given. Considering the high amplification effect along the slope of the seismic response, the dynamic stability checking model of the prestressed anchor slope supporting structure is established according to the theory of limit equilibrium and the failure mode. The proposed method is applied to the engineering example and compared with the finite element method. The results show that the proposed analysis model has high accuracy and is a simple and practical method for analysis and design. The most dangerous section under the earthquake occurs in the upper part of the slope. The section size of the beam and column is ductile design and occurrence of slope The main controlling factor of crushing.