砂垫层-基础滑移复合隔震单层村镇砌体建筑抗震性能振动台试验研究

SHAKING TABLE TEST OF SAND CUSHION-SLIDING BASE COMPOSITE SEISMIC ISOLATION TECHNOLOGY FOR SINGLE-LAYER RURAL MASONRY BUILDINGS

为研究村镇建筑的抗震性能,运用砂垫层隔震理论和基础滑移隔震理论形成的复合隔震技术,设计制作了一单层、单进深、双开间、无构造柱的1/4缩尺复合隔震砌体结构模型,通过削弱橡胶束的限位作用来提升其隔震性能,进行地震模拟振动台试验;以研究低强度改性砂浆滑移层开裂后,复合隔震结构在设防烈度和罕遇烈度地震作用下的隔震效果,对模型的加速度峰值和动力放大系数进行了分析。试验结果表明:复合隔震结构在设防烈度地震作用下滑移量较小,能够一定程度上减小上部结构受到的地震作用;罕遇烈度地震作用下滑移层滑移量加大,可以有效延缓结构的破坏。

In order to study the seismic performance of rural buildings,the composite seismic isolation technology which combines sand cushion seismic isolation theory and sliding base seismic isolation theory was applied. A singlelayer,single-depth,double-bay,1/4 reduced scale composite seismic isolation masonry structure model without any constructional column was designed and built. The study decreased the slip of the rubber beam to enhance the seismic performance and carried out the shaking table test. After the cracking of the low strength modified mortar slipping layer,the seismic isolation performance when the model was under medium intensity earthquake and rare earthquake was investigated. Besides,the peak acceleration and dynamic magnification factor of the model were analyzed. The results showed that when the model was under medium intensity earthquake,small sliding displacement could reduce the seismic performance of super-structure to a certain extent. The increase of the sliding displacement when the model was under rare earthquake could effectively delay the destruction of structure.