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浙江大学学报(工学版)
J4  2013, Vol. 47 Issue (9): 1566-1572    DOI: 10.3785/j.issn.1008-973X.2013.09.008
土木工程、工程力学     
HRB500级钢筋混凝土梁受弯性能分析
蒋遨宇,陈驹,金伟良
浙江大学 结构工程研究所,浙江 杭州 310058
Flexural behaviour analysis of HRB500 reinforced concrete beams
JIANG Ao-yu, CHEN Ju, JIN Wei-liang
Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China
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摘要：

为了研究HRB500钢筋在混凝土梁中的受力性能,进行了7根HRB500钢筋混凝土梁的受弯性能试验,建立了HRB500级钢筋混凝土梁受弯的数值模型.模型以梁截面上的纵向力、截面力矩、钢筋微元力等平衡方程为基础,通过求解任意弯矩作用下任意截面上的平衡方程,确定整根梁的受力响应,得到挠度、曲率、应变等随荷载的变化情况,以及混凝土裂缝宽度的发展情况.模型考虑钢筋与混凝土之间的黏结滑移和裂缝的影响,以及裂缝之间受拉区混凝土的影响,计算结果与7根试验梁结果相比较,验证了模型的准确性.利用建立的数值模型分析了HRB500级钢筋混凝土梁内钢筋与混凝土的协同工作,研究了相邻２条裂缝之间相对滑移、黏结力、混凝土和钢筋应变等的变化情况.对多因素进行参数分析,分析表明:采用高强度的混凝土能够较好地利用HRB500钢筋的高强度；随着梁截面高度的增加,裂缝宽度值成为限制梁承载力发挥的制约条件；增加保护层厚度不利于梁承载力的发挥,但影响很小可忽略.
Abstract:

In order to investigate the mechanical performance of HRB500 rebar in concrete beams, a test program of 7 reinforced concrete beams using HRB500 rebar was performed and a corresponding numerical model was established. Based on the axial force and bending moment equilibrium equation on beam section, as well as the translational equilibrium equations of the bar, the numerical model was developed. By solving these equilibrium equations, the response of any beam section under any load condition could be obtained, and the development of deflection, curvature, strain, width of cracks and so on also could be obtained. The effects of initial crack, bond-slip behaviour between rebar and concrete, and the contribution of the concrete in tension between adjacent cracks were taken into consideration in the model. The numerical results were verified against the results of seven tested beams. Based on the developed numerical model, cooperation of rebar and concrete in the bending process, distribution of slip, bonding stress, strain of rebar and so on between adjacent cracks were investigated. In addition, a parametric study was conducted to investigate the influence of several factors on the flexural behaviour of HRB500 reinforced concrete beams. It is shown that utilization of the high strength of HRB500 rebar increases with the increasing concrete strength. The crack  width becomes the controlling factor on the bending capacity while the height of beam cross section increases. The bending capacity of beams decreases with the increasing concrete cover depth, but the effect is negligible．
出版日期: 2013-09-01
:  TU 317  
基金资助:

 国家科技支撑计划资助项目(2006BAJ03A02 )；浙江省建设厅科研推广资助项目
通讯作者: 陈驹，男，副教授.     E-mail: cecj@zju.edu.cn
作者简介: 蒋遨宇（1987-），男，博士生，从事结构工程研究.E-mail：civiljay@gmail.com
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引用本文:

蒋遨宇,陈驹,金伟良. HRB500级钢筋混凝土梁受弯性能分析[J]. J4, 2013, 47(9): 1566-1572.

JIANG Ao-yu, CHEN Ju, JIN Wei-liang. Flexural behaviour analysis of HRB500 reinforced concrete beams. J4, 2013, 47(9): 1566-1572.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2013.09.008    或    http://www.zjujournals.com/eng/CN/Y2013/V47/I9/1566

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