植物夹层与圆木骨架对夯土烽燧抗震力学性能的影响研究

Influence of plant interlayer and log frame on seismic mechanical performance of rammed earth beacon tower

基于实地勘察资料,对某夯土烽燧遗址的两种构筑技法(植物夹层和圆木骨架)进行了分析,讨论了其协同作用机理。分别建立了植物夹层与增设圆木骨架两种三维数值模型,采用时程分析方法,讨论了在不同水平地震加速度下结构地震响应的规律及特点。结果表明:(1)植物夹层能够通过自身变形耗散地震能量,并限制夯土颗粒位移;圆木骨架形成第二道抗震防线;(2)增设圆木骨架能大幅降低结构的峰值加速度和位移响应,但各周期的加速度幅值趋于均匀;加速度峰值可能提前到达;圆木骨架对结构局部位移差异的限制作用有限。

Based on field survey data, two kinds of structure （ plant interlayer and log frame） in rammed earth beacon tower ruins were analyzed, and their synergism mechanism was discussed. Three dimensional numerical models of plant interlayer and adding log frame were established respectively. Using time history analysis method, earthquake response regularity and characteristics of structures under action of different earthquake accelerations were discussed. The results show that： （1） plant interlayers may dissipate seismic energy through its own deformation, and limit the displacement of rammed earth particles; log frame forms the second seismic resistance system; （2） adding log frame may significantly reduce the peak acceleration and displacement response of structure; but the acceleration amplitude of each period tends to be uniform; peak value may arrive early; the limitation effect on the difference of the local displacement is limited.