橡胶混凝土与常规混凝土组合桩抗震性能研究

doi:10.12068/j.issn.1005-3026.2021.06.019

东北大学学报（自然科学版） ›› 2021, Vol. 42 ›› Issue (6): 886-892.DOI: 10.12068/j.issn.1005-3026.2021.06.019

橡胶混凝土与常规混凝土组合桩抗震性能研究

高幸¹，贾金青¹，王维玉²，张丽华¹

(1. 大连理工大学海岸与近海工程国家重点实验室，辽宁大连116024； 2. 河北省建筑科学研究院，河北石家庄050021)

修回日期:2020-11-03 接受日期:2020-11-03 发布日期:2021-06-23
通讯作者: 高幸
作者简介:高幸(1992-)，男，河北秦皇岛人，大连理工大学博士研究生；贾金青(1962-)，男，河北沧州人，大连理工大学教授，博士生导师.
基金资助:
国家重点研发计划项目(2018YFC1505302)；国家自然科学基金资助项目(51678112).

Study on Seismic Performance of Rubber Concrete and Conventional Concrete Composite Pile

GAO Xing¹， JIA Jin-qing¹， WANG Wei-yu²， ZHANG Li-hua¹

1. The State Key Laboratory of Coastal and Offshore Engineering， Dalian University of Technology， Dalian 116024， China; 2. Research Institute of Architecture Science of Hebei， Shijiazhuang 050021， China.

Revised:2020-11-03 Accepted:2020-11-03 Published:2021-06-23
Contact: JIA Jin-qing
About author:-
Supported by:
-

摘要/Abstract

摘要： 地震中，桩基础常常因抗弯能力不足或位移过大而发生破坏.为改善桩基的抗震性能，研发了一种上部为橡胶混凝土、下部为常规混凝土的组合桩.为分析组合桩的抗震性能，在施工现场采用落锤激振模拟震源，对组合桩进行现场足尺试验研究.研究表明:桩顶荷载产生侧向约束，可增强桩基抗震性能.试验中，橡胶混凝土桩段与桩身长度比小于1/6时，荷载约束影响深度为橡胶混凝土桩段长度，橡胶混凝土桩段与桩身长度比大于1/6时，荷载约束影响深度恒为1/6桩长.桩位临近震源，橡胶混凝土桩段减震作用明显，随着桩位远离震源，橡胶混凝土桩段减震性能降低，且不再全长发挥作用.减震效率和橡胶混凝土桩段与桩身长度比值的拟合曲线呈S形，抗震设计时，不可采用持续增加橡胶混凝土桩段长度的方式提高桩的抗震性能.

关键词: 桩；足尺试验；橡胶混凝土；抗震性能；减震效率

Abstract: In earthquake， the pile foundation is often damaged due to the insufficient bending moment resistance and excessive displacement. In order to improve the seismic performance of the pile foundation， a composite pile with rubber concrete at the top and conventional concrete at the bottom was developed. In order to analyze the seismic performance of composite piles， a drop hammer was used to simulate the earthquake source， and a full-scale field test was conducted on the composite piles. The results show that load on the pile top can enhance the seismic performance of the pile foundation. In the test， when the ratio of the rubber concrete pile length to the total pile length is less than 1/6， the depth of the load constraint effect is equal to the rubber concrete pile length. When the ratio of the rubber concrete pile length to the total pile length is more than 1/6， the depth of the load constraint effect is a constant of 1/6 of pile length. The damping effect of the rubber concrete pile is significant if the pile is close to the earthquake source， while it decreases with the increase of the distance from the seismic source， and the rubber concrete section of the pile no longer plays a role in the whole length. The fitting curve of the damping efficiency and the ratio of the rubber concrete pile length to the total pile length is S-shaped. During the seismic design， it is not suitable to continuously increase the length of the rubber concrete pile to improve the seismic performance of the pile.

Key words: pile; full-scale test; rubber concrete; seismic performance; damping efficiency

中图分类号:

TU473.16

高幸，贾金青，王维玉，张丽华. 橡胶混凝土与常规混凝土组合桩抗震性能研究[J]. 东北大学学报（自然科学版）, 2021, 42(6): 886-892.

GAO Xing， JIA Jin-qing， WANG Wei-yu， ZHANG Li-hua. Study on Seismic Performance of Rubber Concrete and Conventional Concrete Composite Pile[J]. Journal of Northeastern University(Natural Science), 2021, 42(6): 886-892.

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橡胶混凝土与常规混凝土组合桩抗震性能研究

Study on Seismic Performance of Rubber Concrete and Conventional Concrete Composite Pile

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