中文摘要：

为了确定某大跨空间结构的最佳受力体系，结合结构形态学知识，根据ESO方法的基本原理，以有限元分析软件ANSYS为平台，建立初始设计域的三维实体模型，以每个单元的存活状态为设计变量，以结构体积最小为目标函数，对该大跨空间结构进行了结构受力体系的选形优化．为满足建筑意图及特殊基础条件的限制，最终选形结果确定为钢结构拱支承受力体系．最后，将ESO方法选形优化确定的结构受力体系与原设计院逆吊法选形优化确定的结构受力体系进行静力计算变形和内力的对比分析，说明了ESO方法选形结果比逆吊法选形结果具有优越性，验证了ESO方法对大跨空间结构受力体系选形优化的可行性及高效性，同时得出了拓扑优化方法对大跨空间结构受力体系选形优化的重要性和必要性．

英文摘要：

In order to determine the optimal force system of a large-span spatial structure （LSSS）, based on the morphological knowledge and basic theory of ESO method, the three-dimensional solid model of an initial design domain was established by ANSYS software;and by taking the status of every unit as the design variables and the minimum volume as the objective function, the ESO method was then applied to the LSSS for structural force system optimization.To meet the architectural intent and the restrictions of special foundation conditions, the arch-bearing force system of steel structure was finally presented. Eventu- ally, by comparing the static analysis results of the deformation and inner force for structural force systems determined by the ESO method and original inverse hanging method, the feasibility and availability of the ESO method was demonstrated.It is shown that the topology optimization methods are essential and necessary for optimizing structural force system of the LSSS.