-
摘要: 为了准确计算连续配筋混凝土路面早期裂缝的分布和发展规律, 基于钢筋混凝土间粘结滑移的非线性本构关系, 采用接触理论, 建立了连续配筋混凝土路面在温度变化和混凝土干缩情况下的有限元刚度方程, 得出了计算早期裂缝宽度和裂缝间距的有限元解。研究了混凝土抗拉强度、弹性模量的变化、施工季节、配筋率和钢筋直径等因素对连续配筋混凝土路面早期裂缝的影响。计算结果表明: 混凝土抗拉强度与弹性模量随龄期的变化对连续配筋混凝土路面的早期裂缝在浇筑完成后28d内影响显著, 随着龄期的增加逐渐趋于稳定, 配筋率和配筋方式对早期裂缝的影响较大, 为控制早期裂缝的发展, 采用小直径多根数的配筋方式较为合理, 且最好在秋季施工。Abstract: In order to accurately calculate the distribution and development laws of early crack for continuously reinforced concrete pavement(CRCP), the nonlinear bond-slip relation between reinforced steel bar and concrete was analyzed, the finite element stiffness equation of CRCP was established by using contact theory under the circumstances of temperature change and dry shrinkage of concrete, the finite element solutions of crack width and crack space were obtained, and the effects of concrete tensile strength, elastic modulus change, construction season, reinforcement ratio and steel bar diameter on early crack were studied.Calculation result shows that the changes of concrete tensile strength and elastic modulus have a greater impact on early crack within 28 d after concrete pouring completion, the impact is gradually stable with the increase of concrete age; the reinforcement ratio and reinforcement mode also have a great impact on early crack, multiple-strand small-diameter reinforcement mode is more reasonable for the control of early crack, and it is better that construction season is autumn.
-
图 3 有限元解与解析解结果对比
Figure 3. Comparison between finite element solutions and analytic solutions
图 4 线性关系和非线性关系计算结果
Figure 4. Calculation results of linear relation and nonlinear relation
图 6 同时考虑混凝土抗拉强度和弹性模量对早期裂缝的影响
Figure 6. Effect of considering concrete tensile strength and elastic modulus on early crack
-
[1] 王虎, 胡长顺, 王秉纲. 连续配筋混凝土路面在横向荷载作用下的解析解[J]. 西安公路交通大学学报, 1999, 19(4): 1-5.Wang Hu, Hu Chang-shun, Wang Bing-gang. Analytic solution for continuously reinforced concrete pavement under transverse loading[J]. Journal of Xi'an Highway University, 1999, 19(4): 1-5. (in Chinese) [2] 曹东伟. 连续配筋混凝土路面结构研究[D]. 西安: 长安大学, 2001. [3] 曹东伟, 胡长顺. 连续配筋混凝土路面温度应力分析[J]. 西安公路交通大学学报, 2001, 21(2): 1-5.Cao Dong-wei, Hu Chang-shun. Analysis of the thermal stress for continuously reinforced concrete pavement(CRCP)[J]. Journal of Xi'an Highway University, 2001, 21(2): 1-5. (in Chinese) [4] 陈云鹤, 邓学钧, 周早生. 连续配筋混凝土路面温度应力的弹性解[J]. 应用力学学报, 2000, 17(4): 76-80.Chen Yun-he, Deng Xue-jun, Zhou Zao-sheng. Elastic solution for thermal stress in continuously reinforced concrete pavement(CRCP)[J]. Chinese Journal of Applied Mechanics, 2000, 17(4): 76-80. (in Chinese) [5] 陈锋锋, 黄晓明, 秦永春. 连续配筋混凝土路面横向裂缝分布模型的研究[J]. 公路交通科技, 2006, 23(6): 18-21.Chen Feng-feng, Huang Xiao-ming, Qin Yong-chun. Study on the probability distribution model of continuously reinforced concrete pavement transverse cracks[J]. Journal of Highway and Transportation Research and Development, 2006, 23(6): 18-21. (in Chinese) [6] 陈云鹤, 邓学钧, 杨树才, 等. 连续配筋混凝土路面早期裂缝宽度分析[J]. 中国公路学报, 1998, 11(S): 36-42.Chen Yun-he, Deng Xue-jun, Yang Shu-cai, et al. Analysis of crack width in continuously reinforced concrete pavement(CRCP)at early ages[J]. China Journal of Highway and Transport, 1998, 11(S): 36-42. (in Chinese) [7] 李卓, 查旭东, 张起森. 连续配筋混凝土路面早期横向开裂分析[J]. 中外公路, 2003, 23(2): 26-28.Li Zhuo, Zha Xu-dong, Zhang Qi-sen. Analysis of dehiscence in continuously reinforced concrete pavement(CRCP)at early ages[J]. Journal of China and Foreign Highway, 2003, 23(2): 26-28. (in Chinese) [8] 宋玉普, 赵国藩. 钢筋与混凝土间粘结应力-滑移关系的应力变分模型[J]. 大连理工大学学报, 1994, 34(1): 59-67.Song Yu-pu, Zhao Guo-fan. Stress variation model of bond stress-slip relationship between steel bar and concrete[J]. Journal of Dalian University of Technology, 1994, 34(1): 59-67. (in Chinese) [9] 汤广来. 钢筋与混凝土粘结应力计算模式的研究[J]. 合肥工业大学学报: 自然科学版, 1999, 22(5): 103-107.Tang Guang-lai. Study on calculating model of bond stress between reinforcing bar and concrete[J]. Journal of Hefei University of Technology: Natural Science, 1999, 22(5): 103-107. (in Chinese) [10] JTG D40—2002, 公路水泥混凝土路面设计规范[S]. [11] McCullough B. Three-dimensional nonlinear finite element analysis of continuously reinforced concrete pavements[D]. Austin: the University of Texas at Austin, 2000. -
下载:
点击查看大图
图(8)
计量
- 文章访问数: 279
- HTML全文浏览量: 79
- PDF下载量: 247
- 被引次数: 0
