预应力混凝土实心方桩抗震性能试验研究

IF 2.1 4区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Shunfeng Gong, Yueqian Zhao, Hua Fan, Shunliang Xu, Quanbiao Xu, Junwei Ren, Yong Lu
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引用次数: 0

摘要

与预应力混凝土管桩相比,预应力混凝土实心方桩(PCSS)具有更高的侧向承载力和耐久性,更适用于高烈度地震区和腐蚀环境中的桩基工程。目前,对 PCSS 桩的桩身抗震性能还缺乏研究。本文对 PCSS 桩的抗震性能进行了实验研究以及相关的理论和有限元(FE)分析。在不同轴力比的横向循环荷载作用下,对三个全尺寸 PCSS 桩试件进行了测试,并对结果进行了分析。根据试验结果,提出了 PCSS 桩承载力的理论计算方法。建立了 PCSS 桩试件的有限元模型,并根据测试结果进行了验证。在此模型的基础上,进行了参数分析。结果表明,PCSS 桩试件均表现出典型的弯曲破坏。在低轴向力比条件下,PCSS 桩试件的破坏模式是预应力筋的拉伸断裂。在高轴力比下,破坏受覆盖层混凝土破碎的影响,而核心区混凝土保持完整,预应力筋没有外屈,箍筋也没有断裂。在轴向力较小的情况下,增加预应力筋的比例可以同时提高承载能力和变形能力。然而,在较高的轴力比下,增加预应力筋比或混凝土强度可提高承载能力,但会导致变形能力下降。与预应力旋喷高强度混凝土(PHC)桩相比,PCSS 桩在变形能力和延性方面表现出更好的抗震性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental study on seismic performance of prestressed concrete solid square piles
Prestressed concrete solid square (PCSS) piles exhibit superior lateral bearing capacity and durability compared to pretensioned spun concrete pipe piles, and are more suitable for pile foundation engineering in high-intensity seismic regions and corrosive environments. There is still a lack of research on the seismic performances of the pile body of PCSS piles. This paper presents an experimental study and the associated theoretical and finite element (FE) analyses on the seismic performance of PCSS piles. Three full-scale PCSS pile specimens were tested under lateral cyclic loads with various axial force ratios, and the results are analyzed. Following the tests, a theoretical calculation method is proposed for the bearing capacity of PCSS piles. A FE model for PCSS pile specimens is established and validated against the test observations. Based on this model, a parametric analysis is then conducted. The results show that the PCSS pile specimens all exhibit typical flexural failure. Under a low axial force ratio, the failure mode of PCSS pile specimen is governed by the tensile rupture of prestressing tendons. Under a high axial force ratio, the failure is influenced by the crushing of cover concrete, while the concrete in the core zone remains intact, and there is no outward buckling of prestressing tendons and no rupture of stirrups. Increasing the prestressing tendon ratio can simultaneously improve the bearing and deformation capacity under a lower axial force. Under higher axial force ratios, however, increasing the prestressing tendon ratio or concrete strength can improve the bearing capacity but lead to a decline in deformation capacity. Compared to pretensioned spun high-strength concrete (PHC) piles, PCSS piles exhibit better seismic behavior on aspects of deformation capacity and ductility.
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来源期刊
Advances in Structural Engineering
Advances in Structural Engineering 工程技术-工程:土木
CiteScore
5.00
自引率
11.50%
发文量
230
审稿时长
2.3 months
期刊介绍: Advances in Structural Engineering was established in 1997 and has become one of the major peer-reviewed journals in the field of structural engineering. To better fulfil the mission of the journal, we have recently decided to launch two new features for the journal: (a) invited review papers providing an in-depth exposition of a topic of significant current interest; (b) short papers reporting truly new technologies in structural engineering.
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