基于试验修正的徐变模型及其在混凝土柱中应用
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摘要
高层建筑的长期性能受到混凝土徐变的影响,混凝土徐变会导致混凝土柱应力应变重分布,影响混凝土柱的力学性能。为了研究徐变对混凝土柱的影响,文中进行了3组不同矿物掺量下高性能混凝土试块的徐变试验,根据试验数据修正了CEB FIP 90模型,根据修正的模型数值模拟分析了10年内混凝土柱在徐变作用下混凝土和纵筋应力的发展规律。结果表明,混凝土柱的应力重分布主要发生在持荷早期,持荷60d时应力重分布完成65%,持荷365d时完成将近90%;徐变会导致纵筋压应力大幅度的增长;混凝土的徐变越大,混凝土柱中混凝土和纵筋的应力变化幅度越大。
Long-term performance of high-rise buildings is affected by concrete creep. The creep of concrete will lead to the redistribution of stress and strain of concrete columns, which will affect the mechanical properties of concrete columns. In order to study the effect of creep on concrete columns, creep tests of three groups of high performance concrete blocks with different mineral content were carried out. According to the test data, the CEB FIP 90 model is modified. Based on the modified model, the stress development of concrete and longitudinal reinforcement of concrete column under creep in 10 years is analyzed by numerical simulation. The results show that the stress redistribution of concrete columns mainly occurs in the early stage of loading, and the stress redistribution is 65% in 60 days and nearly 90% in 365 days. Creep will lead to a large increasement of compressive stress of longitudinal reinforcement. The greater the creep of concrete, the greater the stress variation of concrete and longitudinal reinforcement in concrete columns.
Long-term performance of high-rise buildings is affected by concrete creep. The creep of concrete will lead to the redistribution of stress and strain of concrete columns, which will affect the mechanical properties of concrete columns. In order to study the effect of creep on concrete columns, creep tests of three groups of high performance concrete blocks with different mineral content were carried out. According to the test data, the CEB FIP 90 model is modified. Based on the modified model, the stress development of concrete and longitudinal reinforcement of concrete column under creep in 10 years is analyzed by numerical simulation. The results show that the stress redistribution of concrete columns mainly occurs in the early stage of loading, and the stress redistribution is 65% in 60 days and nearly 90% in 365 days. Creep will lead to a large increasement of compressive stress of longitudinal reinforcement. The greater the creep of concrete, the greater the stress variation of concrete and longitudinal reinforcement in concrete columns.
引文
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[2]涂兵,方志.新旧混凝土板桥横向拼接后的收缩徐变效应分析[J].中国公路学报,2016,29(10):66-76.
[3]CHEN K,WANG R,LIAO J.The research on high-strength concrete creep[Z].2018.
[4]赵庆新,孙伟,缪昌文.粉煤灰掺量和水胶比对高性能混凝土徐变性能的影响及其机理[J].土木工程学报,2009,42(12):76-82.
[5]赵庆新,孙伟,缪昌文,等.磨细矿渣掺量对混凝土徐变性能的影响及其机理(英文)[J].硅酸盐学报,2009,37(10):1760-1766.
[6]赵华耕,彭劲,周明凯.粉煤灰、矿粉对高性能混凝土体积稳定性的影响[J].武汉理工大学学报,2005(7):36-38.
[7]ZHANG L L,WU L Q,YANG J X,et al.Effect of fly ash on creep of high performance concrete used in bridge[J].Applied mechanics and materials.2012,208:2192-2195.
[8]GU C,WANG Y,GAO F,et al.Early age tensile creep of high performance concrete containing mineral admixtures:Experiments and modeling[J].Construction and building materials.2019,197:766-777.
[9]雷自学,晏兴威,董三升.混凝土收缩徐变效应对曲线钢-混凝土箱形结合梁桥的影响[J].长安大学学报(自然科学版),2008(5):77-80.
[10]BAZANT Z P,PRASANNAN S.Solidification theory for concrete creep.I:Formulation[J].Journal of engineering mechanics,1989,115(8):1691-1703.
[11]戴碧琳,吴杰,张其林.内埋型钢混凝土柱的收缩和徐变参数分析[J].东华大学学报(自然科学版),2018,44(4):608-616.
[12]王强强,陈敏.施工过程中混凝土徐变对结构竖向变形影响的有限元模拟[J].南通职业大学学报,2013,27(1):79-82.
[13]翁运新.基于ANSYS二次开发的PC箱梁徐变效应分析[D].长沙:中南大学,2011.
[14]崔晨光.沿海环境高耐久性混凝土徐变特性试验研究及预测模型[D].赣州:江西理工大学,2018.
[15]中交公路规划设计院.公路钢筋混凝土及预应力混凝土桥涵设计规范:JTG D62-2004[S].北京:交通出版社,2004.
[16]CEB-FIP Model Code for Concrete Structures 1990[S].London:Published by Thomas Telford,1990.
[17]惠荣炎,黄国兴.混凝土徐变与收缩[M].北京:中国电力出版社,2012.
[18]陆春阳,苏庆田,黄生富.有限元计算中混凝土徐变应力分析方法比较[C]//第18届全国结构工程学术会议论文集,广州,2009.
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