不同温降下渡槽温度应力模拟及保温层厚度设计
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摘要
以大型输水工程U型渡槽为例,利用有限元软件计算分析了渡槽在不同降温幅度下的温度应力。为考察玻化微珠保温层的保温性能,模拟计算了不同保温层厚度下三维渡槽的瞬态温度应力。根据数值模拟结果,对比分析了有无保温措施渡槽外表面温度主应力。分析结果表明:当降温幅度大于10℃时将在渡槽外表面产生不可忽略的温度拉应力。根据计算结果,综合考虑保温效果与经济性,实际工程中玻化微珠保温涂层的涂覆厚度以0.5~1 cm为宜,该厚度的保温层能有效控制渡槽混凝土外表面温度裂缝。
Aiming at a large aqueduct,we use finite element analysis to research the aqueduct thermal stress under different temperature drop rates in winter. In order to study the thermal insulation performance of the layer of vitrified micro bubbles,the transient principal thermal stress of the large aqueduct with different thickness insulation paint are simulated and calculated.Based on the result,we compare the surface thermal stress of the aqueduct with and without insulation layer. The results show that notable thermal stress will occur on the aqueduct surface when the temperature drop rate is larger than 10 degree. By considering the insulation effect and economy,the rational layer thickness should be in 0. 5 ~ 1. 0 cm,which could effectively control the thermal crack of the aqueduct.
Aiming at a large aqueduct,we use finite element analysis to research the aqueduct thermal stress under different temperature drop rates in winter. In order to study the thermal insulation performance of the layer of vitrified micro bubbles,the transient principal thermal stress of the large aqueduct with different thickness insulation paint are simulated and calculated.Based on the result,we compare the surface thermal stress of the aqueduct with and without insulation layer. The results show that notable thermal stress will occur on the aqueduct surface when the temperature drop rate is larger than 10 degree. By considering the insulation effect and economy,the rational layer thickness should be in 0. 5 ~ 1. 0 cm,which could effectively control the thermal crack of the aqueduct.
引文
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[17]严娟,季日臣,马虎迎.箱形渡槽越冬期间表面保温能力计算[J].水利水运工程学报,2013(6):88-91.
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[19]田士军,胡士辉,张桂花.南水北调兰河涵洞式渡槽三维有限元温度应力计算分析[J].中国农村水利水电,2012(8):120-122.
[20]宋书卿,王长德,冯晓波,等.空心渡槽的温度应力研究[J].中国农村水利水电,2005(11):86-88.
[21]李文超,余剑英.渡槽保温材料的制备和性能研究[J].武汉理工大学学报,2008,31(4):37-40.
[22]耿运生,施炳利,和秀芬,等.南水北调渡槽侧壁温度场及保温材料应用分析[J].南水北调与水利科技,2005(6):22-24.
[23]白新理,王单飞,吴泽玉,等.保温板对大型渡槽结构温度应力的影响分析[J].中国农村水利水电,2014(6):154-157.
[2]竺慧珠,陈德亮,管枫年.渡槽[M].北京:中国水利水电出版社,2005.
[3]冯晓波,夏富洲,王长德,等.南水北调中线大型渡槽运行期温度场的计算[J].武汉大学学报:工学版,2007,40(2):25-28.
[4]Zuk W.Thermal and shrinkage stresses in composite beams[J].Aci strctural Journal,1961(10):143-59,7987.
[5]Moorty S,Roeder C W.Temperature-dependent bridge movements[J].Journal of Structural Engineering,1992,118(4):1090-1105.
[6]朱伯芳,吴龙珅,李玥,等.混凝土坝施工期坝块越冬温度应力及表面保温计算方法[J].水利水电技术,2007,38(8):34-37.
[7]厉易生,朱伯芳.寒冷地区拱坝苯板保温层的效果及计算方法[J].水利学报,1995(7):54-58.
[8]朱文婷,严天佑,郑光俊,等.气温变化对“U”形薄壁渡槽表面应力的影响分析[J].人民长江,2012,43(23):47-51.
[9]冯晓波,夏富洲,王长德,等.温度荷载对大型U形预应力渡槽的影响研究[J].中国农村水利水电,2008(6):106-108.
[10]孙明权,牛占永,甄剑颖,等.温度荷载对预应力排水渡槽的影响[J].人民长江,2008,39(11):82-83.
[11]赵山,刘海涛,吴泽玉.寒潮作用下U形渡槽温度应力分析[J].人民长江,2009,40(17):62-63.
[12]李玉河,吴泽玉.U形和矩形渡槽温度应力对比分析[J].人民长江,2008,39(16):67-68.
[13]陈茜,季日臣.日照作用下箱型渡槽温度场与温度应力研究[J].人民长江,2014,45(S2):128-130.
[14]李书群,和秀芬.南水北调中线沼河渡槽运行期温度影响及对策[J].南水北调与水利科技,2006,4(3):22-24.
[15]季日臣,陈尧隆,等.骤然降温作用下混凝土箱形渡槽横向温度应力分析[J].水利水电技术,2007,38(1):50-51.
[16]季日臣,夏修身,房振叶,等.预应力混凝土箱形渡槽日照温度应力分析[J].兰州交通大学学报,2006,25(1):8-11.
[17]严娟,季日臣,马虎迎.箱形渡槽越冬期间表面保温能力计算[J].水利水运工程学报,2013(6):88-91.
[18]任德记,张超,王刚,等.预应力矩形渡槽温度应力有限元分析[J].中国农村水利水电,2011(12):111-113.
[19]田士军,胡士辉,张桂花.南水北调兰河涵洞式渡槽三维有限元温度应力计算分析[J].中国农村水利水电,2012(8):120-122.
[20]宋书卿,王长德,冯晓波,等.空心渡槽的温度应力研究[J].中国农村水利水电,2005(11):86-88.
[21]李文超,余剑英.渡槽保温材料的制备和性能研究[J].武汉理工大学学报,2008,31(4):37-40.
[22]耿运生,施炳利,和秀芬,等.南水北调渡槽侧壁温度场及保温材料应用分析[J].南水北调与水利科技,2005(6):22-24.
[23]白新理,王单飞,吴泽玉,等.保温板对大型渡槽结构温度应力的影响分析[J].中国农村水利水电,2014(6):154-157.