By fully utilizing the designability of semi-rigid connections in precast concrete structures, the gradient-based interior point algorithm is applied to perform a two-stage optimization with the objectives of minimum material cost and a target interstorey drift ratio distribution. To obtain an efficient storey lateral stiffness estimate for optimization, the modified Muto’s method is further extended to address hybrid distributions of connections. Based on the characteristics of the modified Muto’s method, the dual objectives of attaining the target interstorey drift ratio distribution and minimizing the material cost are treated as two separate objectives in the optimization. A case study on precast concrete frames with different storeys, connection parameters and target interstorey drift ratio distribution patterns demonstrates the efficiency and accuracy of the proposed approach. Such an approach could be suitable for the preliminary design of precast concrete structures with hybrid semi-rigid connections.

充分利用预制混凝土结构半刚性连接的可设计性，应用基于梯度的内点算法，以最小材料成本和目标层间漂移比分布为目标进行两阶段优化。为了获得用于优化的有效楼层横向刚度估计，修改后的 Muto 方法进一步扩展以解决连接的混合分布。基于改进的Muto方法的特点，在优化中将获得目标层间漂移比分布和最小化材料成本的双重目标作为两个独立的目标处理。不同楼层预制混凝土框架的案例研究，连接参数和目标层间漂移率分布模式证明了所提出方法的效率和准确性。这种方法适用于混合半刚性连接的预制混凝土结构的初步设计。