An Initial Equilibrium State Analysis for the Adjustments of the Axial Forces in Key Segments of Cable-stayed and Cable-stayed-suspension Hybrid Bridges Ye Seul Im
ABSTRACT This paper presents an initial equilibrium analysis which can adjust the axial forces in key segments of cable-stayed and cable-stayed-suspension hybrid bridges. The proposed method is based on an analysis of target configurations under dead loads by Newton-Raphson method. The details for adjusting the axial forces of key seg-ments by disconnecting the bridges are described in this paper. The adjustment of the axial forces of key segments is achievable by calculating the sectional forces and the fitting lengths of key segments, which make the compatibility conditions at the separated section satisfied, when the exact axial forces are acting on the section. The sectional forces are analyzed by iterative updating using the sensitivity of the displacements to achieve the compatibility conditions for the vertical and the rota-tional displacements, and the initial coordinates of the disconnected points are al-tered by successive iteration to achieve the compatibility condition for the longitu-dinal displacement. It is possible to achieve not only the target configurations un-der dead loads but also the given axial forces of key segments by the method pro-posed. The two examples for the cable-stayed and cable-stayed-suspension bridges are presented to demonstrate the validity and the effectiveness of the proposed method.
Key Word initial equilibrium state analysis, TCUD, cable-stayed bridge, ca-ble-stayed-suspension hybrid bridge, axial force of key segment
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