摘要
在有限元分析中,预应力的施加方法主要有等效荷载法、初始应变法和降温法。针对矩形截面混凝土梁,采用这三种方法进行预应力施加,得出初始应变法和降温法的计算精度更高,且能反映出钢筋上的轴力分布。对比这三种预应力施加方法的优缺点,针对大型混凝土渡槽复杂的三向预应力结构,寻求最适当的模拟方式。以南水北调中线上某大型预应力渡槽为背景,采用初始应变法和降温法分别进行有限元计算,提出降温法对于渡槽三向复杂预应力结构的模拟更为合理。
In finite element analysis, there are mainly three ways of applying prestress, including equivalent load method, initial strain method and decreasing temperature method. Taking a concrete beam with rectangular crosssection as an example, prestress is applied by these three methods. It＇s concluded that initial strain method and decreasing temperature method have higher accuracy and can reflect the axial force distribution of reinforced steel bar. A contrast of the characteristics of these three methods is made. In view of the complex three-dimensional prestressed structure of large concrete aqueduct, the most suitable method of prestress simulation is found. Taking the large prestressed aqueduct in the middle line of South to North Water Transfer Project as the background, the finite element analysis, the initial strain method and the decreasing temperature method are separately carried on. It＇s suggested that the decreasing temperature method is more reasonable for the numerical simulation of complex three-dimensional prestressed aqueduct structure.
出处
《水力发电学报》
EI
CSCD
北大核心
2009年第3期97-100,90,共5页
Journal of Hydroelectric Engineering
关键词
水工结构
数值模拟
降温法
渡槽
预应力混凝土
hydraulic structure
numerical simulation
decreasing temperature method
aqueduct
prestressedconcrete
