论文部分内容阅读
饱和砂土地基在爆炸荷载作用下会发生液化,地基上的结构物将受到爆炸荷载及地基液化的双重作用,从而产生不均匀沉降和破坏性变形。基于大型现场爆炸液化试验,对场地上钢筋混凝土(RC)结构的动力响应和地基液化后RC结构的变形进行了分析研究。结果表明:液化场地中浅埋RC结构产生了明显的不均匀沉降,且最大沉降量达到结构高度的10%,结构差异沉降达到最大沉降量的1/5,结构沉降变形在液化后15 h时基本稳定;RC结构表面未产生明显的裂缝,动态拉、压应变均在400??以内,不会对结构造成显著破坏;结构动力响应表现为柱侧加速度峰值明显大于梁侧,但柱侧动力稳定所需时间较梁侧短,即柱承受了更大的瞬时冲击力且其抵抗瞬时冲击力的能力更强。研究结果可以为在可液化地基中的浅埋RC结构稳定设计等工程情况提供参考。
Saturated sand foundations liquefy under the action of blast loads, and the structures on the foundation will be subjected to both the explosive load and the liquefaction of the foundation, resulting in uneven settlement and destructive deformation. Based on the large-scale blasting liquefaction test, the dynamic response of reinforced concrete (RC) structure on site and the deformation of RC structure after foundation liquefaction were analyzed. The results show that the shallow RC structures in the liquefied field have obvious non-uniform settlement, and the maximum settlement reaches 10% of the height of the structure, and the difference of structural settlement reaches 1/5 of the maximum. The settlement of the structure changes at 15 h after liquefaction The structure dynamic response is that the peak value of columnar acceleration is obviously larger than that of the beam side, but the lateral force of the column is not obvious. The time required for stabilization is shorter than the beam side, meaning that the pole withstands greater instantaneous impact and its ability to resist instantaneous impact is stronger. The results can provide references for the engineering design of shallow buried RC structures in liquefiable ground.