摘要
扣索索力调整是钢管混凝土拱桥主拱安装采用缆索吊装方法施工时线型控制的重要步骤。基于优化理论提出一种可靠的索力调整方法，将被拉过索鞍点的扣索长度作为设计变量，将高程控制点的竖向位移作为控制变量，优化结果可确定各高程控制点达到其竖向控制位移时扣索的索力，而由优化后的设计变量值又可确定各扣索的延伸量，从而达到索力与延伸量“双控”，且同时度量扣索被拉过索鞍点的长度和确定由激振法通过传感器测得的索力值便于实际操作，并确保施工安全。实践表明，本文所提出的索力调整方法是有效的。
Adjustment of buckle-cable forces is a major procedure of line type control when cablehoisting construction method is adopted for installation of steel tubes of bearing arch of concretefilled steel tubular arch bridges (CFSTAB). This paper gives a reliable method of adjustment of cable forces based on optimum theory: The lengths pulled through the cable saddles are taken as design variables and the vertical displacements of altitude-controlled nodes as control variables.The optimum results can determine the cable forces and the design variables, from which the elongations of all cables can be obtained, when vertical displacements of the altitude-controlled nodes approach to their controlling values. In this way, we can achieve 'double controls' of the forces and the elongations of the cables, make practical operation convenient and assure safety under construction with both the lengths pulled through the saddle and cable-forces caught via the sensors on the cables by vibration method measured simultaneously. An example shows that the method is effec tive.
出处
《武汉交通科技大学学报》
1999年第5期575-578,共4页
Journal of Wuhan University of Technology(Transportation Science & Engineering)
关键词
钢管混凝土
拱桥
缆索吊装
扣索索力
调整
concrete-filled steel tubular arch bridges
cable-hoisting construction
adjustment of buckle-cable forces
