摘要
土工合成材料加筋土柔性桥台复合结构(GRS-IBS)是一种可以实现桥梁一体化设计施工的新型技术,针对该种结构的抗震性能的研究还不多。通过一组振动台缩尺模型试验,研究GRS-IBS结构的抗震性能,研究结果表明,GRS-IBS结构具有良好的抗震性能,在强震作用下(地震波的峰值加速度达到1.0g)能保持良好的整体稳定性能,仅在桥台面层顶部出现较小的外倾变形(最大变形约为桥台高度的2%)和桥头处轻微的差异沉降;由于地震波的方向性和波形不对称,两侧桥台受到不同的指向临空面的惯性力作用,桥跨结构的存在可使其附近区域的加筋土体所受的惯性力通过桥跨结构传递协调趋于一致;减小桥台的加筋间距有利于提高加筋桥台的抗震性能,主要表现在减小结构变形及分担筋材轴力方面。
Geosynthetics reinforced soil flexible abutment composite structure,as a new technology,can realise the integrated design and construction for bridges.However,the literature on the seismic performance of this structure is very limited.This paper is to study the seismic performance of a scaled model of geosynthetic reinforced soil abutment structure by the shaking table test.Experimental results showed that the geosynthetic reinforced soil abutment structure had excellent seismic performance,which could maintain great global stability under strong earthquakes until the peak ground acceleration reached 1.0g.There was only a small camber deformation found at the top of the abutment,and the maximum deformation was around 2%of the abutment height.The slight differential settlement was also observed at the bridgehead.Due to the directionality and asymmetry of the seismic excitation,the inertial forces pointing to the free surface of the abutments on both sides were different.The bridge beam could transfer and coordinate the inertial forces of the nearby reinforced soil and made it approximately equal.In addition,reducing the reinforcement spacing was beneficial to improving the seismic performance of the geosynthetic reinforced soil abutment,which was mainly manifested in minimising the structural deformation and distributing the axial forces of reinforcements.
作者
徐超
罗敏敏
任非凡
沈盼盼
杨子凡
XU Chao;LUO Min-min;REN Fei-fan;SHEN Pan-pan;YANG Zi-fan(Department of Geotechnical Engineering of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2020年第S01期179-186,194,共9页
Rock and Soil Mechanics
基金
国家科技部重点专项(No.2016YFE0105800)
关键词
加筋土
加筋复合体(GRS)
柔性桥台
振动台试验
抗震性能
reinforced soil
geosynthetic reinforced soil(GRS)
flexible abutment
shaking table test
seismic performance
