摘要
桩基础在水平地震力作用下,产生弯矩和剪力在桩头最大,导致承台和桩身连接处过早发生破坏,因此,需要对桩与承台连接处进行加强,通过现场对制作的加强型试件填芯混凝土管桩进行水平往复加载,研究各级荷载作用下其裂缝发展变化,并绘制荷载位移、应变曲线,得出填芯混凝土管桩抗弯承载能力比普通管桩有大幅度提高,加强环劈裂裂缝的扩展使节点处抗弯承载力迅速降低。发生连接处破坏后,填芯部分和加强环仍保证其有较大承载力,而整个加载过程中加强环根部应变较小且阻止了管桩在出现裂缝前其节点处发生破坏。
Horizontal seismic force makes the bending moment and shear force maximum on the tip of pile when the earthquake comes. It will early cause destruction on the joint of pile cap and pile, therefore, it needs to be strengthened. The prestressed enhanced pipe pile was horizontally loaded to investigate the displacement and strain curve and development of cracks under different loading levels. The tests show that the moment bearing capacity of the filled pile is larger than general pile and cleavage cracks rapidly reduce the flexural bearing capacity of pile. At the same time, the core section and strengthening ring still ensure pile to have great bearing capacity after the joint destruction. The strain of reinforcement ring root is small in the whole loading process and successfully prevents cracks of pile before the joint destruction.
出处
《施工技术》
CAS
北大核心
2014年第7期34-38,共5页
Construction Technology
基金
山西省留学人员科技活动择优资助活动项目(02020028)
关键词
桩基础
管桩
抗弯承载力
试验
piles
pipe piles
bending bearing capacity
tests
