CAJ | 학술논문

为优化钢桁架拱桥的结构设计,利用ANSYS有限元软件的APDL二次开发功能,建立参数化钢桁架拱桥模型,开发影响线计算程序.利用影响线求解桥梁结构最不利活载位置.通过灵敏度分析将优化设计与可靠度分析联系起来,以桥梁结构关键构件和关心位置最大轴向应力和最大竖向位移为状态变量,以截面尺寸为设计变量,并以全桥自重为目标函数,将基于可靠度的结构优化与传统结构优化进行对比.结果表明,基于可靠度的钢桁架拱桥优化结构可以节省大量计算时间和空间,并有效减轻桥梁的自重,改善结构受力.
위우화강항가공교적결구설계,이용ANSYS유한원연건적APDL이차개발공능,건립삼수화강항가공교모형,개발영향선계산정서.이용영향선구해교량결구최불리활재위치.통과령민도분석장우화설계여가고도분석련계기래,이교량결구관건구건화관심위치최대축향응력화최대수향위이위상태변량,이절면척촌위설계변량,병이전교자중위목표함수,장기우가고도적결구우화여전통결구우화진행대비.결과표명,기우가고도적강항가공교우화결구가이절성대량계산시간화공간,병유효감경교량적자중,개선결구수력.
The secondary development APDL of ANSYS FEM software was used to build parametric model of the deck type steel trussed arch bridge and develop influence lines programs so as to optimize the structure design of steel trussed arch bridges. The most unfavorable positions of load with the influence lines were calculated. Through relating the optimum design with the reliability analysis and the sensitivity analysis, and taking the maximal axial stress and maximal vertical displacement as state variables, the sectional dimension as design variables, as well as the weight of the bridge as good function, thereby comparing with the traditional structural optimum design, the structural optimum design based on the reliability theory can save much calculation time and computer memory space, which effectively reduce the weight of the bridge and improve its capacity.