大温差地区不同养护方式下混凝土桥墩温度场及变形性能分析
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摘要
我国西北大部分地区多为干燥、大风、大温差的特殊气候环境,这种特殊的气候环境给混凝土早期开裂带来了不利的影响,混凝土桥墩的开裂受到多方面因素的影响,水化热温差过大是引起混凝土桥墩早期开裂的主要原因,因此,研究混凝土桥墩早期温度场对防止桥墩早期裂缝有重要的指导意义,不同的养护方式下混凝土桥墩内外温差分布不同。本次试验采取三种不同的养护方式,结果表明:自然养护会导致大温差地区混凝土桥墩产生较大的早期温度应力应变,可能会引起温度裂缝,土工布包裹养护对混凝土有保温作用,可以改善混凝土内部温差,新材料包裹养护效果最好,早期良好的保温保湿效果使桥墩内部温度分布较为均匀,并能大幅度减小温度应力应变,起到良好的养护作用。
Most region of northwest China is often dry,wind,and big temperature difference. The special climate environment brought unfavorable influence to the early cracking of concrete,the cracking of concrete bridge piers under the influence of various factors, the largely temperature difference of hydration heat is the main reason of cracking in early concrete pier,therefore,the study of temperature field to prevent concrete bridge pier cracked early have important guiding significance. Different ways of curing lead the difference of concrete piers ' internal and external temperature distribution. This experiment adopt three different ways of curing,the results show that concrete piers of the natural curing can lead too large early temperature stress,that may cause temperature crack,geotextile package curingof concrete have heat preservation effect,can improve the concrete internal temperature difference,the new material package maintenance' s effect is best,the early good insulation moisturizing effect makes the temperature distribution inside the piers is relatively uniform,and can greatly reduce the temperature stress and strain,that have a good curing effect.
Most region of northwest China is often dry,wind,and big temperature difference. The special climate environment brought unfavorable influence to the early cracking of concrete,the cracking of concrete bridge piers under the influence of various factors, the largely temperature difference of hydration heat is the main reason of cracking in early concrete pier,therefore,the study of temperature field to prevent concrete bridge pier cracked early have important guiding significance. Different ways of curing lead the difference of concrete piers ' internal and external temperature distribution. This experiment adopt three different ways of curing,the results show that concrete piers of the natural curing can lead too large early temperature stress,that may cause temperature crack,geotextile package curingof concrete have heat preservation effect,can improve the concrete internal temperature difference,the new material package maintenance' s effect is best,the early good insulation moisturizing effect makes the temperature distribution inside the piers is relatively uniform,and can greatly reduce the temperature stress and strain,that have a good curing effect.
引文
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[13]舒开鸥.大型桥墩的温度场及温度应力的有限元分析[J].山西建筑,2010(5):308-309.
[2]于本田,王起才,周立霞,等.干燥、昼夜大温差气候下混凝土保温保湿养护效果试验研究[J].硅酸盐通报,2012,31(6):1398-1402+1408.
[3]赵文斌,刘建勋,张戎令,等.大温差、强风戈壁环境下混凝土养护与强度的关系[J].混凝土,2016(12):51-56.
[4]赵文斌,刘建勋,张戎令,等.强风、干寒、大温差地区混凝土箱梁早期抗裂性分析[J].硅酸盐通报,2016,35(10):3253-3257+3273.
[5]Sailor M J,Wu E C.Photoluminescence-based sensing with porous silicon films,microparticles,and nanoparticles[J].Adv.Funct.Mater.,2009,19:3195.
[6]He Y,Zhong Y L,Peng F,et al.One-pot microwave synthesis of water-dispersible,ultraphoto-and p H-stable,and highly fluorescent siliconquantum dots[J].J.Am.Chem.Soc.,2011,133:14192.
[7]李青.高原铁路桥墩大体积混凝土温度场及温度应力分析[D].兰州:兰州交通大学,2015.
[8]林冠东.混凝土连续箱梁实体桥墩、箱梁0#块混凝土水化热温度应力场分析[D].长沙:中南大学,2012.
[9]章征,王凯,李毓龙,等.混凝土桥墩施工期水化热及表面抗裂影响因素研究[J].桥梁建设,2015(2):65-70.
[10]吴迅,刘仕龙.实体混凝土桥墩水化热和施工开裂分析[J].结构工程师,2012(6):156-160.
[11]周立霞.西北戈壁地区高性能混凝土耐久性研究[D].兰州:兰州交通大学,2011.
[12]张亮亮,赵亮,袁政强,等.桥墩混凝土水化热温度有限元分析[J].重庆大学学报(自然科学版),2007(10):73-76.
[13]舒开鸥.大型桥墩的温度场及温度应力的有限元分析[J].山西建筑,2010(5):308-309.
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