斜拉桥拉索单元模型和其计算模拟.pdfVIP

施溪溪,等: 斜拉桥拉索单元模型及其计算模拟 施溪溪 李鸿晶 ( 210009) 斜拉索的模拟有许多种方法,而应用最为普遍的则属等效弹性模量法, 用Ernst 公式进行弹性模量的修 正然而, 对于跨度日渐增大的斜拉桥的拉索, 此方法是否还能保证其模拟的精确性还需要进一步的探讨为此, 讨论了斜拉索的非线性特征,建立斜拉索的状态方程, 并介绍了几种常见的索模型及其特点, 其中详细介绍了等效 弹性模量法的原理算例中 用Ernst 公式对苏通大桥6 根长短索进行修正, 计算主梁竖向位移,并与悬链线模型 算出的结果进行精度比较,分析得出等效弹性模量法的适用范围 索单元 等效弹性模量法 非线性分析 CABLE MODEL AND COMPUTING SIMULATION OF CABLE-STAYED BRIDGES Shi Xix i Li Hongjing (Institute of Lifeline Engineering, Nanjing University of Technology Nanjing 210009) ABSTRACT any methods areavailable to simulate bracing cables, of which the equivalent elastic modulus method is the most common one. T he elastic modulus can also be corrected by Ernst formula. The nonlinear characteristics of the bracing cables are discussed and thestate equation for the bracing cables is also established. Several common cablemodels and their features are presented, of which the principle of the equivalent elastic modulus method is described in detail. T aking Suzhou-Nantong Bridge for example, whose six long and short cables are corrected by Ernst formula; the calculated vertical displacement of the main girder is compared with the result by the catenary model, and the applicable scopeof theequivalent elasticmodulus method is also got by the analysis. KEY WORDS cable element equivalent elasticmodulus method nonlinear analysis , , 1 , 200~ 600m , , 1, A, , B; w ; A , ,x , y , , ;B( a, h) , , , , 2 , i , Ai A H , V , N , ( ) x