3D Shrinkage and Creep Effects of Concrete Under Varying Temperature Environment
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摘要: 为准确分析混凝土的收缩徐变效应，基于收缩徐变的三维特性，对自然变温度环境下的混凝土收缩徐变效应进行了分析，建立了变温环境下混凝土三维收缩徐变效应的力学模型，并结合有限元分析软件ABAQUS开发了相应的计算程序，随后通过两个算例验证了方法的可行性与结果的可靠性. 研究结果表明：对于长期下挠和混凝土应变，模型计算值最大误差分别为8.2%和 –7.1%；模型能够很好地体现温度对徐变应变的影响，总体变化趋势与实测值较为一致，最大误差为 –20.5%，随着龄期增长误差越来越小，最终值误差为6.4%.Abstract: In order to analyze shrinkage and creep effects of concrete exactly, based on the three-dimensional (3D) characteristics of shrinkage and creep, the shrinkage and creep effects of concrete under an ambient temperature environment were analyzed. A 3D shrinkage and creep effects mechanical model for concrete was established for varying temperature environments, and the corresponding calculation process was integrated with finite element analysis software ABAQUS. Then, the feasibility of the method and reliability of the results were verified using two examples. The results demonstrate that the maximum error of the model calculation is 8.2% and –7.1% for long-term deflection and concrete strain, respectively. The model suitably reflects the effect of temperature on creep strain, and the overall trend is consistent with the measured values. The maximum error is –20.5%, and this value decreases with the increase in age, the final error is 6.4%.
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表 1 跨中长期下挠计算值比较
Table 1. Comparison of computed long-term deflection of mid-span
时间/d 实测值/mm 文献[9]计算
值/mm本文模型计算值/mm 文献[9]与实测值误差/% 本文模型与实测值误差/% 文献[9]变异
系数本文模型变
异系数50 8.46 8.50 7.99 0.5 –5.6 0.9 1.7 100 9.14 9.62 8.83 5.3 –3.4 1.4 2.7 150 9.37 9.97 9.24 6.5 –1.4 2.1 3.4 200 9.33 10.14 9.47 8.7 1.5 3.3 3.9 250 9.30 10.28 9.63 10.5 3.5 4.7 4.1 300 9.38 10.37 9.73 10.6 3.8 6.1 4.4 350 9.60 10.43 9.81 8.7 2.3 8.0 4.7 400 9.63 10.49 9.88 9.0 2.6 9.1 5.3 450 9.56 10.48 9.93 9.6 3.9 9.5 5.1 495 9.21 10.50 9.96 14.1 8.2 10.4 5.3 
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BAZANT Z P, HUBLER M H, QIANG Y. Pervasiveness of excessive segmental bridge deflections[J]. ACI Structural Journal, 2011, 108(6): 766-774. HUBLER M H. ROMAN W, BAZANT Z P. Comprehensive database for concrete creep and shrinkage analysis and recommendations for testing and recording[J]. ACI Materials Journal, 2015, 112(4): 547-558. BAZANT Z P. Prediction of concrete creep and shrinkage past,present,and future[J]. Nuclear Engineering and Design, 2001, 203(1): 27-38. doi: 10.1016/S0029-5493(00)00299-5 BAZANT Z P, CUSATIS G, CEDOLIN L. Temperature effect on concrete creep modeled by microprestress-solidification theory[J]. American Society of Civil Engineers, 2004, 130(6): 691-699. KIM J K, KWON S H, KIM S Y, et al. Experimental studies on creep of sealed concrete under multiaxial stresses[J]. Magazine of Concrete Research, 2005, 57(10): 623-634. doi: 10.1680/macr.2005.57.10.623 PAN Z F, LU Z T, FU C C. Experimental study on creep and shrinkage of high strength plain concrete and reinforced concrete[J]. Advances in Structural Engineering, 2011, 14(2): 47-235. VANDEWALLE L. Concrete creep and shrinkage at cyclic ambient conditions[J]. Cement and Concrete Composites, 2000, 22(3): 201-208. doi: 10.1016/S0958-9465(00)00004-4 杨永清,鲁薇薇,李晓斌,等. 自然环境混凝土徐变试验和预测模型研究[J]. 西南交通大学学报,2015,50(6): 977-983. doi: 10.3969/j.issn.0258-2724.2015.06.002YANG Yongqing, LU Weiwei, LI Xiaobin, et al. Experimental study and prediction model for concrete creep in ambient environment[J]. Journal of Southwest Jiaotong University, 2015, 50(6): 977-983. doi: 10.3969/j.issn.0258-2724.2015.06.002 李法雄. 组合梁斜拉桥空间受力行为及时变效应_李法雄[D]. 北京: 清华大学, 2011 黄海东,向中富,郑皆连. PC箱梁桥三维徐变效应精细化分析[J]. 中国公路学报,2013,26(5): 108-114. doi: 10.3969/j.issn.1001-7372.2013.05.015HUANG Haidong, XIANG Zhongfu, ZHENG Jielian. Experimental study and prediction model forconcrete creep in ambient environment[J]. China Journal of Highway and Transport,, 2013, 26(5): 108-114. doi: 10.3969/j.issn.1001-7372.2013.05.015 牛艳伟,石雪飞,阮欣. 混凝土结构三维徐变的有限元计算方法[J]. 同济大学学报,2009,37(4): 475-480.NIU Yanwei, SHI Xuefei, RUAN Xin. A finite element analysis method of concrete structure with three dimensional creep[J]. Journal of Tongji University, 2009, 37(4): 475-480. BAZANT Z P, YU Q, LI G H, et al. Excessive deflections of record span prestressed box girder-lessons learned from the collapse of the koror-babeldaob bridge in palau[J]. Concrete International Detroit, 2010, 32(6): 44-52. 杨永清,郭凡,刘国军,等. 大跨预应力混凝土连续梁式桥长期下挠研究中的问题[J]. 铁道建筑,2010(9): 1-4. doi: 10.3969/j.issn.1003-1995.2010.09.001YANG Yongqing, GUO Fan, LIU Guojun, et al. Issues about research of long-term deflection for large-span prestressed concrete continuous girder bridge[J]. Railway Engineering, 2010(9): 1-4. doi: 10.3969/j.issn.1003-1995.2010.09.001 徐腾飞,向天宇,赵人达. 钢筋混凝土偏心受压柱长期变形随机分析[J]. 西南交通大学学报,2014,49(4): 626-630. doi: 10.3969/j.issn.0258-2724.2014.04.010XU Tengfei, XIANG Tianyu, ZHAO Renda. Long-term random deflection of eccentrically loaded RC column[J]. Journal of Southwest Jiaotong University, 2014, 49(4): 626-630. doi: 10.3969/j.issn.0258-2724.2014.04.010 樊健生,聂鑫,李全旺. 考虑收缩、徐变及开裂影响的组合梁长期受力性能研究(I):试验及计算[J]. 土木工程学报,2009,42(3): 8-15. doi: 10.3321/j.issn:1000-131X.2009.03.002FAN Jiansheng, NIE Jianguo, WANG Hao. Long-term behavior of composite beams with shrinkage,creep and cracking (I):experiment and calculation[J]. China Civil Engineering Journal, 2009, 42(3): 8-15. doi: 10.3321/j.issn:1000-131X.2009.03.002 樊健生,聂建国,王浩. 考虑收缩、徐变及开裂影响的组合梁长期受力性能研究(II):理论分析[J]. 土木工程学报,2009,42(3): 16-22. doi: 10.3321/j.issn:1000-131X.2009.03.003FAN Jiansheng, NIE Jianguo, WANG Hao. Long-term behvior of composite beams with shrinkage,creep and cracking (II):thoretical analysis[J]. China Civil Engineering Journal, 2009, 42(3): 16-22. doi: 10.3321/j.issn:1000-131X.2009.03.003 何岸,蔡健,陈庆军,等. 钢套管再生混凝土加固轴心受压钢筋混凝土柱性能研究[J]. 西南交通大学学报,2018,53(6): 1187-1194,1204.HE An, CAI Jian, CHEN Qingjun, et al. Behavior of steel-jacket retrofitted column with recycled aggregate concrete under axial loading[J]. Journal of Southwcst Jiaotong Univcrsity, 2018, 53(6): 1187-1194,1204. -
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