Tests for aseismic performance of pile-to-pile cap joint of cast-in-place piles with steel casings

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (3) : 79-84.

ZHANG Ju-hui1 WANG Wei1 JIANG Da-wei1 GUAN Zhong-guo2

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Abstract

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 load-bearing 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.

Key words

steel casing / cast-in-place pile / pile-to-pile cap joint / hysteretic behavior / load-bearing capacity / aseismic performance

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ZHANG Ju-hui1 WANG Wei1 JIANG Da-wei1 GUAN Zhong-guo2. Tests for aseismic performance of pile-to-pile cap joint of cast-in-place piles with steel casings[J]. Journal of Vibration and Shock, 2018, 37(3): 79-84

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