斜拉桥无应力索长的精确求解方法.pdfVIP

38 7 ( ) Vol. 38 No.7 2010 7 J. Huazhong Univ. of Sci. Tech. (Natural Science dition) Jul. 2010 汪 峰 刘沐宇 ( 武汉理工大学 道路桥梁与结构工程湖北省重点实验室, 湖北武汉430070) : , , , ,. , , . : ; ; ; ; ; : U448.27 : A :2010 An accurate method for determi ning unstressed cable length in l ong span cable stayed bri dge Wang Feng L iu Muyu ( Hubei Key Laboratory of Roadw ay Bridge and Structure ngineering, Wuhan University of Technology, Wuhan 430070, China) Abstract: In order to determinate unstressed cable length and realize the initial configuration of long span cable stayed bridge, an accurate solution method of unstressed cable length is proposed based on the static equilibrium equations of an centenary element of a stay cable. T hrough an explicit expres sion of cable end tension force, the characteristic parameter constraint equations are established under cable tension force known, and the iterative formulas are given for an accurate solution method of un stressed cable length. The unstressed cable lengths of one building long span cable stayed bridgewere calculated, the results show the reliability of the method through contrasted with analytic solution and rnst method. T he solutions can be directly applied in engineering design when the parameters are given by design. Key words: cable stayed bridge; unstressed cable length; catenary element; cable end tension force; constraint equation; iterative formulas [ 6, 7] , , . , [ 8]