预制桥墩节段节点抗剪性能研究—–拟静力试验
PDF下载 (462)吴威业,奚康,布占宇 *.预制桥墩节段节点抗剪性能研究—–拟静力试验[J].宁波大学学报(理工版),2017,30(2):106-111.DOI:
WU Wei-ye,XI Kang,BU Zhan-yu *.Shear resistant performance investigation of segment joints in precast columns: Quasi-static test[J].Journal of Ningbo University(Natural Science & Engineering Edition),2017,30(2):106-111.DOI:
| Title: | Shear resistant performance investigation of segment joints in precast columns: Quasi-static test |
| 作者: | 吴威业, 奚康, 布占宇 * |
| Author(s): | WU Wei-ye, XI Kang, BU Zhan-yu * |
| 关键词: | 预制混凝土; 节段桥墩; 节点; 抗剪强度; 拟静力加载试验 |
| Keywords: | precast concrete; segmental column; joint; shear strength; quasi-static loading test |
| 分类号: | U443.22 |
| 文献标识码: | A |
| 摘要: | 预制节段拼装桥墩在节段接缝处混凝土断开, 仅通过纵向钢筋和剪力键连接相邻节段, 节点抗剪承载能力是设计工程师所关心的关键设计变量. 通过拟静力单调加载直接剪切试验研究了3组节段节点的抗剪性能, 试验参数包括剪力键的数量和长度、平接缝、接触面约束应力等. 分析了试验得到的剪切力—滑移曲线、受力阶段和破坏机理, 根据试验结果的回归分析得到了预制节点抗剪承载力经验公式, 并与AASHTO和已有文献中的回归公式进行了比较. 结果表明, 带剪力键试件的剪切破坏形式为多个阳齿的剪断和单个阴齿的斜裂缝, 平接缝试件的剪切破坏形式为滑移和截面的拉伸裂缝, AASHTO公式计算结果与试验结果趋势一致. 多剪力键干接缝试件发展了较好的延性剪力—滑移响应, 可作为推荐的预制拼装桥墩接缝构造形式. |
| Abstract: | The segment concrete of precast segmental bridge column is discontinuous at the joint. Longitudinal reinforcement and shear keys are used to connect the two adjacent segments. The shear resistant capacity of joint is a key design quantity concerned by design engineers. The shear performance of three groups of segment joints was studied through quasi-static monotonic direct shear loading test. The parameters of test included number and length of shear keys, flat joint, and confinement stress of joint. The shear force-slip displacement curve, loading stage and damage mechanism were analyzed. The empirical formula of shear resistant capacity of precast joint was derived through test regression analysis. The proposed equation was then compared with that suggested by AASHTO and other literature. The results show that the damage pattern of the keyed dry joints was shear-off of multiple convex shear keys and diagonal crack of single concave shear key. The damage form of the flat dry joint was slippage and tensile crack on interface. The calculation results by AASHTO formula had same tendency with the test results. Multi-keyed specimens developed satisfying ductile shear force-slip displacement response. So it is recommended to be the preferred configuration of precast segmental column joints. |
| 参考文献 /References: | [1] BUYUKOZTURK O, BAKHOUM M M, BEATTIE S M. Shear behavior of joints in precast concrete segmental bridges[J]. Journal of Structural Engineering, ASCE, 1990, 116(12):3380-3401. [2] ZHOU X M, MICKLEBOROUGH N, LI Z J. Shear strength of joints in precast concrete segmental bridges[J]. ACI Structural Journal, 2005,102(1):3-11. [3] JIANG H B, CHEN L, MA Z G J, et al. Shear behavior of dry joints with castellated keys in precast concrete segmental bridges[EB/OL]. [2016-06-16]. http://dx.doi. org/10.1061/(ASCE)BE.1943-5592.0000649. [4] SHAMASS R, ZHOU X M, ALFANO G. Finite-element analysis of shear-off failure of keyed dry joints in precast concrete segmental bridges[EB/OL]. [2016-06-16]. http:// dx.doi.org/10.1061/(ASCE)BE.1943-5592.0000669. [5] ISSA M A, ABDALLA H A. Structural behavior of single key joints in precast concrete segmental bridges[J]. Journal of Bridge Engineering, ASCE, 2007, 12(3):315- 324. [6] KANEKO Y, CONNOR J J, TRIANTAFILLOU T C, et al. Fracture mechanics approach for failure of concrete shear key I: Theory[J]. Journal of Engineering Mechanics, ASCE, 1993, 119(4):681-700. [7] AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS. Guide specifications for design and construction of segmental concrete bridges[M]. Washington DC, American Association of State Highway and Transportation Officials, 2003:9-20. |
| 备注/Memo: | 收稿日期:2016－06－28. 宁波大学学报（理工版）网址:http://journallg.nbu.edu.cn/ 基金项目:国家自然科学基金（51208268）; 宁波市自然科学基金（2015A610293）; 宁波市交通运输科技项目（201507, 201602）; 桥梁工程结构动力学开放基金（201603）; 桥梁结构抗震技术开放基金（201603）; 浙江省大学生科技创新活动计划（2015R405074）. 第一作者:吴威业（1991－）, 男, 浙江宁波人, 在读硕士研究生, 主要研究方向: 桥梁抗震. E-mail:wuweiye701@163.com *通信作者:布占宇（1977－）, 男, 山东聊城人, 副教授, 主要研究方向: 桥梁抗震. E-mail:buzhanyu@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
