对某钢筋混凝土多层大悬挑结构进行受力分析和优化设计,结合建筑造型,采用斜拉钢管内设预应力筋吊拉多层钢筋混凝土悬挑梁,一次施加预应力,形成空间整体悬挑桁架,解决了钢筋混凝土大悬挑梁的承载力和变形问题。同时对钢管节点设计、张拉控制应力、预应力损失的控制、张拉过程及监测过程提出了设计建议。 In this paper, a reinforced concrete multi-layer large cantilever structure subjected to force analysis and optimization design was constructed. With prestressed tendons, the prestressed concrete beams were used to suspend the prestressed concrete beams, Pick truss, to solve the bearing capacity and deformation of large cantilevered beams. At the same time, the design suggestions for the design of steel pipe joints, the control of tensioning, the control of prestress loss, the tensioning process and the monitoring process are put forward.