곡선 사장교의 풍하중을 고려한 횡방향 거동 해석

Abstract

A study for the transverse behavior of the curved steel cable-stayed bridge and PSC cable-stayed bridge under the static wind load as well as dead load and cable forces is presented. To account for the nonlinear behaviors of the curved cable-stayed bridge, material and geometric nonlinearity and time-dependent properties of materials are considered. A cable-stayed bridge is modeled as an assemblage of frame elements consisting of concrete and steel fibers, prestressing tendon segments and three-dimensional curved cable elements. In order to investigate the effectiveness of auxiliary cables on the transverse behavior of the curved cable-stayed bridge, nonlinear analyses on the curved steel and PSC cable-stayed bridge erected with or without the auxiliary cables are carried out. In addition, nonlinear analyses on the transverse behavior of the bridge for the static wind load are carried out at each erection step of the bridge. The numerical results show that the transverse deflections and bending moments of the bridge deck during construction stages can be greater than those of the bridge after completion. Moreover, the auxiliary cables are found to be effective to reduce the transverse deflections and moments of the bridge deck whether the wind load is considered or not.