重力式与格构式组合支挡结构位移和应变地震响应的振动台试验研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (24) : 183-189.

论文

重力式与格构式组合支挡结构位移和应变地震响应的振动台试验研究

文畅平

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Shaking table test study on seismic displacement and strain response of combined earth retaining structure under seismic loads

WEN Chang-ping

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文章历史 +

摘要

重力式挡土墙与格构式框架护坡组合是典型的高边坡支护方式，其地震作用下的动位移和动应变响应特性是颇为关注的问题，为此设计了一个比尺为1:8的边坡模型，开展大型振动台试验研究。试验结果表明：支挡结构只在水平向地震波作用下产生水平向的动位移响应，X向激振下的动位移负峰值和XZ双向激振下的动位移正峰值较小。当激振加速度 ≤0.6g时，在X向或XZ双向激振下，动位移正峰值和负峰值基本相同，当＞0.6g时，X向激振时动位移正峰值大于负峰值，而在XZ双向激振时负峰值大于正峰值。在X向或XZ双向激振下，当 ≤0.6g时永久位移响应幅度较小，而当＞0.6g时响应强度急剧增大。XZ双向激振时永久位移量稍大于X向激振且方向相反。重力式挡墙的动位移模式为平移与转动的耦合，且动位移模式的变化与地震动方向、烈度相关；格构式锚杆框架梁的动位移模式为平移。在水平向地震波作用下，重力式挡墙墙顶和框架梁产生较大的正向动应变响应。

Abstract

The combination of gravity retaining wall and lattice framed anchor structure is one of typical high slope supporting methods, and the response of seismic displacement and seismic strain have become the problems that people pay more attention. Therefore, a slope model with the geometric scale of 1:8 was designed and a large-scale shaking table model test was performed to study these dynamic response characteristics. The results show that: The horizontal seismic displacement responses of retaining structures are excited mainly by the horizontal excitation acceleration. The response intensity of negative peak seismic displacement under X excitation and positive peak seismic displacement under XZ excitation are small. Under X- or/and XZ- excitation, the response intensity of positive peak seismic displacement are approximately equal to that of negative peak seismic displacement at excitation acceleration ≤0.6g; and at ＞0.6g, the response intensity of positive peak seismic displacement is greater than that of negative peak seismic displacement under X excitation; and it is opposite under XZ excitation. The response intensity of seismic permanent displacement under X- or/and XZ- excitation at ≤0.6g are small, but the response intensity at ＞0.6g increase rapidly with excitation acceleration. The permanent displacement under XZ excitation is slightly greater than that under X excitation but in opposite direction. The seismic displacement mode of gravity retaining wall is the coupling of slide and rotation, and the seismic mode transform is determined by the direction and intensity of seismic excitation; The seismic displacement mode of anchored beam is translation. The top of gravity retaining wall and anchored beam mainly present positive strain response under the horizontal seismic excitation.

导出引用

文畅平. 重力式与格构式组合支挡结构位移和应变地震响应的振动台试验研究[J]. 振动与冲击, 2012, 31(24): 183-189

WEN Chang-ping. Shaking table test study on seismic displacement and strain response of combined earth retaining structure under seismic loads[J]. Journal of Vibration and Shock, 2012, 31(24): 183-189