摘要
为探究钢护筒与承台的合理连接方式,对钢护筒-混凝土灌注桩承台节点浅嵌入、锚筋嵌入、深嵌入三种不同的构造形式进行拟静力试验,分析三种不同试件的破坏特征、滞回性能、承载力、刚度、延性及耗能性能等抗震指标,研究钢护筒与承台连接节点形式对节点抗震性能的影响。结果表明:深嵌入节点构造方式的抗震性能最佳,可明显改善节点的承载能力、累积滞回耗能与刚度。锚筋嵌入和浅嵌入试件的主要破坏模式为近节点区承台混凝土的开裂与剥落,浅嵌入的破坏效应最为明显,承载力最差,锚筋嵌入形式虽在承载能力上相较浅嵌入形式提高20%,但仍然提供一种弱节点连接形式。
To explore a reasonable joint connection between casing and cap,quasi-static tests were conducted on three specimens constructed with different pile-to-pile cap joint forms including a shallow embedment form,a shallow embedment one strengthened with anchor bars and a deep embedment one. Test results were evaluated with aseismic indexes including failure feature,hysteretic behavior,load-bearing,stiffness,ductility,and energy dissipation to study the effects of joint connection form between casing and cap on aseismic performance of joint. The results showed that the deep embedment form has the best aseismic performance,it can significantly improve the joint's load-bearing capacity,and accumulate hysteretic dissipated energy and stiffness; cracking and spalling of cap concrete cover near joint zone are the main failure modes for other two forms; the shallow embedment form'failure effect is the most obvious,and its loadbearing capacity is the poorest; although the shallow embedment strengthened with anchor bars form has a 20% higher load-bearing capacity than the shallow embedment one does,it is a weak joint connection form.
出处
《振动与冲击》
EI
CSCD
北大核心
2018年第3期79-84,共6页
Journal of Vibration and Shock
基金
国家自然科学基金(51408359
51378384)
关键词
钢护筒
混凝土灌注桩
桩头节点
滞回性能
承载力
抗震性能
steel casing
cast-in-place pile
pile-to-pile cap joint
hysteretic behavior
load-bearing capacity
aseismic performance
