DYNAMIC ANALYSIS OF ACTIVE-CONTROL, CABLE-STAYED GUIDEWAY

The effects of cable-tension control on guideway deflection of a plana r, cable-stayed support structure for moving vehicles is examined. The structure studied is referred to as double stayed, as it incorporates stay cables both above and below the guideway in a symmetric arrangem ent. Use of double stay cables allows static guideway alignment to be determined and maintained by cable pretension. A typical guideway sect ion is modeled as a simply supported beam with discrete elastic suppor ts at the cable connections. The supporting pylon is treated as a cant ilever beam with concentrated end loads. Fourier analysis and the meth od of assumed modes are used to solve the coupled equations of motion when the guideway is subjected to a moving constant load. Numerical re sults show that guideway deflection can be effectively reduced through tension control in the lower stay cables. Modification of lower-cable tensions in response to external loading has the effect of increasing the load-carrying ability of the pretension in upper cables.