预应力节段预制拼装梁接缝直剪承载力计算方法

孙长军; 宋守坛

doi:10.3724/j.gyjzG21092507

预应力节段预制拼装梁接缝直剪承载力计算方法

doi: 10.3724/j.gyjzG21092507

孙长军¹,
宋守坛^2, ,

1. 柳州欧维姆机械股份有限公司, 广西柳州 545005;
2. 东南大学土木工程学院, 南京 211102

基金项目:

国家重点研发计划项目(2017YFC0703006-01)

江苏省博士后科研资助计划项目(1601148B)。

详细信息

作者简介:
孙长军,高级工程师,主要从事预应力混凝土结构研究。

通讯作者:
宋守坛,主要从事预应力混凝土结构研究,songshoutan@seu.edu.cn。

计量
- 文章访问数: 41
- HTML全文浏览量: 5
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2021-09-25
- 网络出版日期: 2024-06-22

A Calculation Method for Direct Shear Bearing Capacity of Joints of Prestressed Precast Concrete Segmental Beams

SUN Changjun¹,
SONG Shoutan^{2
, ,}

1. Liuzhou OVM Machinery Co., Ltd, Liuzhou 545005, China;
2. School of Civil Engineering, Southeast University, Nanjing 211102, China

摘要

摘要: 对预应力混凝土节段预制拼装梁接缝直剪受剪承载力进行对比分析研究。通过对接缝直剪破坏的研究进行梳理总结,采用文献中的184个接缝直剪试验数据,对已有接缝承载力预测模型的准确性进行验证,并对不同类型接缝的抗剪强度进行对比。分析结果表明:多键齿接缝直剪承载力小于单键齿接缝,胶接单齿接缝承载力最高,干接多键齿接缝承载力最低,胶接平面接缝介于两者之间。美国节段桥梁规范计算式对干接单键齿接缝预测结果较好,干接多键齿预测结果偏于不安全。通过对比给出了建议的接缝承载力计算模型。接缝直剪承载力和规范最小抗剪截面承载力对比分析结果表明,按中国公路桥梁规范(JTG 3362—2018)设计的结构,截面高度小于5 m时,基本不会出现胶接键齿直剪破坏。
- 节段预制拼装梁 /
- 直剪承载力 /
- 键齿接缝 /
- 预应力 /
- 最小受剪截面
Abstract: A comparative analysis was conducted on the direct shear bearing capacity of the joints of prestressed precast concrete segmental beams. By sorting out and summarizing the research on direct shear failure of joints, using 184 direct shear test data of joints in the literature, the accuracy of the existing bearing capacity prediction model was verified, and the shear strengths of different joints were compared. The results showed that the direct shear bearing capacity of multi-keyed joints was lower than that of single-keyed joints, the shear bearing capacity of epoxy single-keyed joints was the highest, the shear bearing capacity of dry multi-keyed joints was the lowest, and the shear bearing capacity epoxy plane joints was between the above two. The calculation formula of AASHTO specification was good for predicting the dry single-keyed joints, but the prediction results of dry multi-keyed joints were not safe. A calculation model for the bearing capacity of joints was proposed through comparisons. Based on the comparison between the direct shear bearing capacity of joints and the bearing capacity of minimum shear section in codes, the analysis results show that for the structure designed according to JTG 3362—2018, when the section height is less than 5 m, there will be no direct shear failure of epoxy keyed joints.
- precast concrete segmental beam (PCSB) /
- direct shear bearing capacity /
- keyed joint /
- prestress /
- minimum shear section

HTML全文

参考文献(28)

[1]	KOSEKI K, BREEN J E.Exploratory study of shear strength of joints for precast segmental bridge[R].Austin: Center for Transportation Research, the University of Texas at Austin, 1983.
[2]	李国平.体外预应力混凝土简支梁剪切性能试验研究[J].土木工程学报, 2007, 40(2):58-63.
[3]	李国平, 沈殷.体外预应力混凝土简支梁抗剪承载力计算方法[J].土木工程学报,2007,40(2):64-69.
[4]	BAKHOUM M M. Shear behavior and design of joints in precast concrete segmental bridges[D]. Cambridge, Massachusetts: Massachusetts Institute of Technology, 1991.
[5]	ANON. Epoxy blamed for crack in bridge[N]. Engineering News-Record, 1979-07-26(13).
[6]	中华人民共和国住房和城乡建设部.节段预制拼装混凝土桥梁技术标准:CJJ/T 111—2023[S]. 北京:中国建筑工业出版社, 2023.
[7]	上海市住房和城乡建设管理委员会.节段预制拼装预应力混凝土桥梁设计标准:DG/TJ 08-2255—2018[S]. 上海:同济大学出版社,2018.
[8]	中华人民共和国住房和城乡建设部.城市轨道交通预应力混凝土节段预制桥梁技术标准: CJJ /T 293—2019[S]. 北京:中国建筑工业出版社, 2019.
[9]	American Association of State Highway and Transportation Officials. Guide specifications for design and construction of segmental concrete bridge[S]. 2nd ed. Washington: AASHTO, 1999.
[10]	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.
[11]	宋守坛. 高速铁路预制拼装箱梁桥抗弯及接缝抗剪试验研究与理论分析[D]. 南京: 东南大学,2015.
[12]	王建超. 节段预制拼装混凝土桥梁接缝抗剪性能实验研究[D]. 南京: 东南大学,2011.
[13]	TURMO J, RAMOS G, APARICIO A C. Shear strength of dry joints of concrete panels with and without steel fibres application to precast segmental bridges[J]. Engineering Structures, 2006,28: 23-33.
[14]	JIANG H B, CHEN L, MA Z G, et al. Shear behavior of dry joints with castellated keys in precast concrete segmental bridges[J]. Journal of Bridge Engineering, 2015, 20(2).[2015-12-30].https://doi.org/10.1061/(ASCE)BE.1943-5592.0000649.
[15]	汪双炎. 悬臂拼装节段梁剪力键模型试验研究[J]. 铁道建筑, 1997(3):23-28.
[16]	卢文良. 节段预制体外预应力混凝土梁设计理论研究[D]. 北京:北京交通大学,2004.
[17]	BUYUKOZTURK O, BAKHOUM M M, MICHAEL B S. Shear behavior of joints in precast concrete segmental bridges[J]. Journal of Structural Engineering, 1990, 116(12): 3370- 3401.
[18]	ALCALDE M, CIFUENTES H, MEDINA F. Influence of the number of keys on the shear strength of post-tensioned dry joints[J]. Material Construction, 2013, 63(310): 297-307.
[19]	刘钊.桥梁概念设计与分析理论[M]. 北京:人民交通出版社, 2010: 134-139.
[20]	王景全,刘桐旭,王震. 考虑弯矩影响的混凝土键齿接缝抗剪承载力计算方法[J]. 东南大学学报(自然科学版), 2017, 47(3):553-558.
[21]	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, 1993,119(4):681-700.
[22]	KANEKO Y, MIHASHI H. Analytical study on the cracking transition of concrete shear key[J]. Materials and Structures, 1999, 32(3): 196-202.
[23]	MATTOCK A H,HAWKINS N M. Shear transfer in reinforced concrete: recent research[J]. PCI Journal, 1972, 17 (2):55-75.
[24]	TURMO J, RAMOS G, APARICIO A C. FEM modelling of unbonded post-tensioned segmental beams with dry joints[J]. Engineering Structures, 2006, 28:1852-1863.
[25]	JIANG H B, WANG S D, FANG Z C, et al. Numerical analysis on the shear behavior of single-keyed dry joints in precast high-strength concrete segmental bridges[J]. Mathematical Biosciences and Engineering, 2019, 16(4):3144-3168.
[26]	中华人民共和国交通运输部.公路钢筋混凝土及预应力混凝土桥涵设计规范:JTG 3362—2018 [S].北京:人民交通出版社股份有限公司,2018.
[27]	American Association of State Highway and Transportation Officials.AASHTO LRFD Bridge Specifications[S].8th ed. Washington: AASHTO, 2017.
[28]	国家铁路局.铁路桥涵混凝土结构设计规范:TB 10092—2017 [S]. 北京:中国铁道出版社,2017.