关键词: 拓扑-尺寸-材料联合优化, 降维处理策略, 三段式延拓法, 大跨度无支撑甲板

Abstract:  A concept-detailed joint design framework was proposed to carry out an integrated topology-size-material optimization study regarding stiffness， deformation， and dynamic vibration performance for a long-span unsupported deck under the spatial constraint. The dimensionality reduction processing strategy for the topology design domain of the stiffened panel was applied to address the issues of disconnected 3D solid units and low computational efficiency of the long-span deck. A TSC method， taking into account the efficiency of iteration and the approximation of the global optimal solution， was presented and applied to the concept design of the long-span deck in terms of strain energy， multi-case displacement， and first-order dynamic frequency. The effectiveness of the TSC method was demonstrated by 480 examples for maximizing the stiffness of stiffened panels. The size/material integrated design approach was suggested and combined with the automation technology for the detailed design of the long-span deck concept structure for engineering fabrication， i.e.， optimization of the combination of cross-sectional dimensions of curved T-beams， panel thickness， and material elastic modulus. The results show that the curved long-span unsupported deck obtained efficiently by the concept-detailed joint design framework possesses both spatial and performance（stiffness， deformation， dynamic vibration）benefits compared to the conventional long-span deck. 

Key words:  , topology-size-material joint optimization, dimensionality reduction processing strategy, three-stage continuation（TSC） , method, long-span unsupported deck