[1] Yan YuanXu Yun, Wang XunPan Jinlong,. Flexural behaviors of double-reinforced ECC beams [J]. Journal of Southeast University (English Edition), 2013, 29 (1): 66-72. [doi:10.3969/j.issn.1003-7985.2013.01.014]
Copy
Flexural behaviors of double-reinforced ECC beams(
)
钢筋增强ECC双筋梁受弯性能研究
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 29
- Issue:
- 2013 1
- Page:
- 66-72
- Research Field:
- Civil Engineering
- Publishing date:
- 2013-03-20
Info
- Title:
- Flexural behaviors of double-reinforced ECC beams
- 钢筋增强ECC双筋梁受弯性能研究
- Author(s):
- Yan YuanXu Yun; Wang XunPan Jinlong
- Key Laboratory of Concrete and Pre-Stressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China
- Keywords:
- engineered cementitious composites(ECC); ultimate carrying capacity; ultimate curvature; ductility; parametric study
- 高延性水泥基复合材料(ECC); 极限承载力; 极限曲率; 延性; 参数分析
- PACS:
- TU354
- DOI:
- 10.3969/j.issn.1003-7985.2013.01.014
- Abstract:
- In order to investigate the flexural behaviors of engineered cementitious composites(ECC), theoretical and experimental researches are done on flexural double-reinforced ECC beams. Based on the assumption of the plane section remaining plane in bending and simplified constitutive models of materials, the calculation methods of load carrying capacities for different critical stages are obtained. Then, these calculation methods are demonstrated by comparing the test results with the calculation results. Finally, based on the proposed theoretical formulae, the effects of the compression strength, compression strain and tension strength of ECC, and the reinforcement ratio on the flexural behaviors of double-reinforced ECC beams are analyzed. The calculated and measured results are in good agreement, which indicates that the theoretical model can be used to predict the moment-curvature response of steel reinforced ECC beams. And the results of parametric studies show that the increase in the compression strength of ECC can greatly improve the flexural performance of beams; the increase in the ultimate compression strain can significantly improve the ultimate curvature and ductility, but has little effect on the load bearing capacity of beams. The tensile strength of ECC has little effect on the flexural behaviors of ECC beams. The increase in the steel reinforcement ratio can lead to significant improvement of the load bearing capacity and the stiffness of beams, but a degradation of the ductility of beams. The theoretical model and parameter analysis results in this paper are instructive for the design of steel reinforced ECC beams.
- 为探究ECC材料受弯性能, 对受弯钢筋增强ECC双筋梁正截面进行了理论和试验研究.首先基于平截面假定和材料本构模型, 得到各阶段承载力计算方法.然后, 通过试验结果与理论结果对比, 验证所提出的梁承载力计算方法正确性.最后, 基于所提出的理论公式, 对ECC材料的抗压强度和抗压应变、抗拉强度和配筋率进行分析, 探究其对钢筋增强ECC双筋梁正截面受弯性能的影响.理论分析结果与试验结果吻合良好, 说明理论分析模型能够用于预测钢筋增强ECC梁的弯矩-曲率关系.参数分析结果表明:提高ECC抗压强度将大幅改进梁受弯性能;提高ECC极限受压应变可大幅提高梁极限曲率和延性, 但对受弯承载力影甚微;ECC抗拉强度对梁受弯性能影响微弱;配筋率的增大可大幅提高梁受弯承载力和刚度, 但会降低梁的延性.所提出的理论计算模型和参数分析结果对于钢筋增强ECC梁受弯性能的设计研究具有指导意义.
References:
[1] Li Zongjin. Advanced concrete technology [M]. New Jersey: John Wiley & Sons, 2011:13-14.
[2] Li V C, Leung C K Y. Steady state and multiple cracking of short random fiber composites [J]. ASCE Journal of Engineering Mechanics, 1992, 188(11):2246-2264.
[3] Kim Y Y, Fischer G, Li V C. Performance of bridge deck link slabs designed with ductile engineered cementitious composite [J]. ACI Structural Journal, 2004, 101(6): 792-801.
[4] Lepech M D, Li V C. Application of ECC for bridge deck link slabs [J]. Materials and Structures, 2009, 42(9): 1185-1195.
[5] Lepech M D, Li V C. Sustainable pavement overlays using engineered cementitious composites [J]. International Journal of Pavement Research and Technology, 2010, 3(5): 241-250.
[6] Christopher K Y L, CheungY N, Zhang J. Fatigue enhancement of concrete beam with ECC layer [J]. Cement and Concrete Research, 2007, 29(6):465-473.
[7] Kesner K, Billington S L. Investigation of infill panels made from engineered cementitious composites for seismic strengthening and retrofit [J]. ASCE Journal of Structural Engineering, 2005, 131(11):1712-1720.
[8] Billington S L. Damage-tolerant cement based materials for performance based earthquake engineering design: research needs[C]//Proceedings of the Fifth International Conference on Fracture Mechanics of Concrete and Concrete Structures. Vail, Colorado, USA, 2004:53-60.
[9] Maalej M, Li V C. Flexural/tensile-strength ratio in engineered cementitious composites [J]. Journal of Materials in Civil Engineering, 1994, 6(4):513-528.
Memo
- Memo:
-
Biographies: Yan Yuan(1989—), female, undergraduate; Pan Jinlong(corresponding author), male, doctor, professor, jinlongp@gmail.com.
Foundation items: The National Natural Science Foundation of China(No.51278118), Program for Special Talents in Six Fields of Jiangsu Province(No.2011JZ010), the Natural Science Foundation of Jiangsu(No.BK2012756), the National Undergraduate Innovative Experiment Program(No.111028660).
Citation: Yan Yuan, Xu Yun, Wang Xun, et al. Flexural behaviors of double-reinforced ECC beams[J].Journal of Southeast University(English Edition), 2013, 29(1):66-72.[doi:10.3969/j.issn.1003-7985.2013.01.014]