LNG储罐混凝土外罐竖向预应力筋的张拉顺序
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摘要
针对某50 000m3 LNG储罐(液化天然气储罐)外罐竖向预应力筋张拉顺序,根据混凝土和预应力钢绞线的本构关系,应用ANSYS有限元软件,建立LNG储罐混凝土外罐和预应力钢绞线有限元模型.通过等效降温法模拟预应力筋的张拉,实现四点、三点、二点对称张拉模拟实验,在不同张拉方法下得到储罐外罐应力、位移及其变化规律.结果表明:二点对称张拉应力普遍偏小,应变与三点对称张拉相似且低于四点对称张拉,二点对称张拉优于其他张拉方式.建议实际LNG储罐设计、施工时采用二点对称张拉竖向预应力筋.
This paper deals with the tension sequence of Vertical prestressing reinforcing steel bar in concrete shell of a 50 000 m3 LNG storage tank. Based on the constitutive relation of concrete and steel, we established finite element model of LNG storage tank prestressed steel strand with finite element software ANSYS. Through the equivalent cooling method simulation tendons drawing, we have realized four, three, two point symmetric tension simulation test. Under different drawing method, we can obtain the tank’s stress and displacement value and its changes. Through comparing the stress and displacement relationship, two point symmetric tension stress is generally smaller than others. Its strain is similar to three tension and lower than four tension. Thus two point symmetric tensioning of tension is superior to other ways. So we suggest that actual LNG tank design and construction should adopt two point symmetric tensioning of vertical tendons.
This paper deals with the tension sequence of Vertical prestressing reinforcing steel bar in concrete shell of a 50 000 m3 LNG storage tank. Based on the constitutive relation of concrete and steel, we established finite element model of LNG storage tank prestressed steel strand with finite element software ANSYS. Through the equivalent cooling method simulation tendons drawing, we have realized four, three, two point symmetric tension simulation test. Under different drawing method, we can obtain the tank’s stress and displacement value and its changes. Through comparing the stress and displacement relationship, two point symmetric tension stress is generally smaller than others. Its strain is similar to three tension and lower than four tension. Thus two point symmetric tensioning of tension is superior to other ways. So we suggest that actual LNG tank design and construction should adopt two point symmetric tensioning of vertical tendons.
引文
[1]骆晓玲,齐长勇,程换新.大型液化天然气储罐的发展研究[J].机械设计与制造,2009,47(9):255-257.
[2]王冰,陈学东,王国平.大型低温LNG储罐设计与建造技术的新进展[J].天然气工业,2010,30(5):108-112.
[3]Rostasy F S,Sprenger K H.Strength and deformation of steel fibre reinforced concrete at very low temperature[J].InternationalJournal of Cement Composites and Light weight Concrete,2000,53:307-333.
[4]Jeon S J,Chung C H.Strength and deformation of steel fibre reinforced concrete at very low temperature[J].International Journal ofCement Composites and Light weight Concrete,1981,2:47-51.
[5]BS7777-1993,Flat-bottome,vertical,cylindrical storage tanks for low temperature service[S].
[6]张云峰,张彬,岳文彤.内罐泄露条件下LNG混凝土储罐预应力外墙模态分析[J].大庆石油学院学报,2008,32(6):86-89.
[7]张斌.预应力LNG储罐混凝土外墙地震响应分析[D].大庆:大庆石油学院,2009.
[8]张云峰,袁朝庆,孙建刚.储罐三维地震响应分析[J].大庆石油学院学报,2003,27(4):71-74.
[9]王伟玲.大型LNG预应力储罐静力荷载下受力性能研究[D].大庆:大庆石油学院,2009.
[10]张云峰,刘晓丽,余亚辉,等.超低温作用下LNG储罐外壁变形分析[J].科学技术与工程,2010,10(3):769-772.
[11]刘晓丽.夹层橡胶垫隔震预应力液化天然气(LNG)储罐地震响应分析[D].大庆:大庆石油学院,2009.
[12]张云峰,田晓雪,郭迎利,等.夹层橡胶垫隔震液化天然气储罐地震响应分析[J].科学技术与工程,2010,10(25):6318-6321.
[13]张瑞甫,翁大根,倪伟波,等.基于阻尼器反力墙体系的特大型LNG储罐控制研究[J].防灾减灾工程学院,2011,31(2):138-144.
[14]张云峰,张彬.预应力方钢管混凝土压弯构件承载力分析[J].低温建筑技术,2009,31(1):50-52.
[15]张云峰,王海平,李科.基于BP神经网络的储罐动响应预测[J].大庆石油学院学报,2006,30(1):67-69.
[2]王冰,陈学东,王国平.大型低温LNG储罐设计与建造技术的新进展[J].天然气工业,2010,30(5):108-112.
[3]Rostasy F S,Sprenger K H.Strength and deformation of steel fibre reinforced concrete at very low temperature[J].InternationalJournal of Cement Composites and Light weight Concrete,2000,53:307-333.
[4]Jeon S J,Chung C H.Strength and deformation of steel fibre reinforced concrete at very low temperature[J].International Journal ofCement Composites and Light weight Concrete,1981,2:47-51.
[5]BS7777-1993,Flat-bottome,vertical,cylindrical storage tanks for low temperature service[S].
[6]张云峰,张彬,岳文彤.内罐泄露条件下LNG混凝土储罐预应力外墙模态分析[J].大庆石油学院学报,2008,32(6):86-89.
[7]张斌.预应力LNG储罐混凝土外墙地震响应分析[D].大庆:大庆石油学院,2009.
[8]张云峰,袁朝庆,孙建刚.储罐三维地震响应分析[J].大庆石油学院学报,2003,27(4):71-74.
[9]王伟玲.大型LNG预应力储罐静力荷载下受力性能研究[D].大庆:大庆石油学院,2009.
[10]张云峰,刘晓丽,余亚辉,等.超低温作用下LNG储罐外壁变形分析[J].科学技术与工程,2010,10(3):769-772.
[11]刘晓丽.夹层橡胶垫隔震预应力液化天然气(LNG)储罐地震响应分析[D].大庆:大庆石油学院,2009.
[12]张云峰,田晓雪,郭迎利,等.夹层橡胶垫隔震液化天然气储罐地震响应分析[J].科学技术与工程,2010,10(25):6318-6321.
[13]张瑞甫,翁大根,倪伟波,等.基于阻尼器反力墙体系的特大型LNG储罐控制研究[J].防灾减灾工程学院,2011,31(2):138-144.
[14]张云峰,张彬.预应力方钢管混凝土压弯构件承载力分析[J].低温建筑技术,2009,31(1):50-52.
[15]张云峰,王海平,李科.基于BP神经网络的储罐动响应预测[J].大庆石油学院学报,2006,30(1):67-69.
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