[1] Chen Lihua, Li Aiqun, Lou Yu, et al. Ultimate negative bending-moment capacityof outer-plated steel-concrete continuous composite beams [J]. Journal of Southeast University (English Edition), 2009, 25 (1): 89-93. [doi:10.3969/j.issn.1003-7985.2009.01.019]

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Ultimate negative bending-moment capacityof outer-plated steel-concrete continuous composite beams()

外包钢-混凝土连续组合梁的负弯矩极限承载力

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

25

Issue:

2009 1

Page:

89-93

Research Field:

Civil Engineering

Publishing date:

2009-03-30

Info

Title:

Ultimate negative bending-moment capacityof outer-plated steel-concrete continuous composite beams

外包钢-混凝土连续组合梁的负弯矩极限承载力

Author(s):

Chen Lihua¹;  2;  Li Aiqun¹;  Lou Yu³;  Li Peibin³

¹School of Civil Engineering, Southeast University, Nanjing 210096, China
²College of Civil and Architectural Engineering, Hefei University of Technology, Hefei 230009, China
³ China Electronics Engineering Design Institute, Beijing 100840, China

陈丽华¹;  2;  李爱群¹;  娄宇³;  李培彬³

¹东南大学土木工程学院, 南京 210096; ²合肥工业大学土木建筑工程学院, 合肥 230009; ³中国电子工程设计院, 北京 100840

Keywords:

outer-plated steel-concrete composite beam;  continuous beam;  negative moment;  bending-moment bearing capacity

外包钢-混凝土组合梁;  连续梁;  负弯矩;  受弯承载力

PACS:

TU317.1

DOI:

10.3969/j.issn.1003-7985.2009.01.019

Abstract:

Static load tests and bearing capacity analyses are carried out for two outer-plated steel-concrete continuous composite beams.The load-deflection curve and the load-strain curve of specimens are obtained and analyzed.The test results indicate that effective cooperation can be achieved by the shear-resistant connection between the reinforcement in the negative moment area and the outer-plated steel beam, and the overall working performance of the composite beams is favorable.At the load-bearing limiting state, the plastic strain on the maximum negative and positive moment section becomes fully developed so as to form relatively ideal plastic hinges.With the increase in the reinforcement ratio, the moment-carrying capacity of the composite beams improves significantly, but the ductility of the beams and the rotation ability of the plastic hinges decrease.The formulae for calculating the limit bending capacity in the negative moment area of outer-plated steel-concrete composite beams are proposed based on the test data.The calculated results agree well with the test results.

对2根外包钢-混凝土连续梁试件进行了静力加载实验研究与承载力分析.测量并分析了试件的荷载-挠度及荷载-应变关系曲线.结果表明:外包钢-混凝土组合梁负弯矩区钢筋和外包钢梁通过抗剪连接措施能有效地共同工作, 整体工作性能良好.在承载能力极限状态, 负弯矩和正弯矩最大截面的塑性应变均充分发展, 并形成比较理想的塑性铰.随着配筋率的提高, 组合梁受弯承载力明显提高, 而延性和转动能力相应降低.在试验数据基础上, 给出了外包钢-混凝土组合梁在负弯矩区极限受弯承载力的计算公式, 计算结果与实验结果吻合良好.

References:

[1] Chen Lihua.Experimental investigation on the new-type outer-plated steel-concrete continuous composite beams and joints[D].Nanjing:School of Civil Engineering of Southeast University, 2006.(in Chinese)
[2] Du Derun, Li Aiqun, Chen Lihua.Experimental study on steel encased concrete composite beam[J].Building Structure, 2007, 36(4):64-67.(in Chinese)
[3] Xiao Hui, Li Aiqun, Du Derun.Experimental study on ultimate flexural capacity of steel encased concrete composite beams[J].Journal of Southeast University:English Edition, 2005, 21(2):191-196.
[4] Zhu Pinru, Gao Xiangdong, Wu Zhensheng.Research on plastic hinge behaviour and internal moment redistribution in steel concrete continuous composite beam[J].Journal of Building Structures, 1990, 11(6):26-37.(in Chinese)
[5] Wang Ting, Nie Jianguo, Li Bingyi, et al.Study on ultimate flexural capacity of composite steel-concrete beams with profiled sheeting[J].Journal of Building Structures, 2001, 22(2):61-65.(in Chinese)
[6] Oehlers D J, Nguyen N T, Ahmed M, et al.Partial interaction in composite steel and concrete beams with full shear connection[J].Journal of Constructional Steel Research, 1997, 41(2/3):235-248.
[7] Fabbrocino G, Manfredi G, Cosenza E.Ductility of composite beams under negative bending:an equivalence index for reinforcing steel classification[J].Journal of Constructional Steel Research, 2001, 57(2):185-202.
[8] Fabbrocino G, Manfredi G, Cosenza E.Analysis of continuous composite beams including partial interaction and bond[J].Journal of Structural Engineering, 2000, 126(12):1288-1294.
[9] Manfredi G, Fabbrocino G, Cosenza E.Modeling of steel-concrete composite beams under negative bending[J].Journal of Engineering Mechanics, 1999, 125(6):654-662.

Memo

Memo:

Biographies: Chen Lihua(1972—), female, doctor;Li Aiqun(corresponding author), male, doctor, professor, aiqunli@sina.com.
Citation: Chen Lihua, Li Aiqun, Lou Yu, et al.Ultimate negative bending-moment capacity of outer-plated steel-concrete continuous composite beams[J].Journal of Southeast University(English Edition), 2009, 25(1):89-93.

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