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通过中国济源篮球城11.5 m悬臂结构的工程实践,阐述型钢、有粘结、无粘结预应力混凝土组合构件的结构方案和设计方法,探讨该组合结构型钢顶端竖向张拉及预应力水平张拉的组合张拉方案和保证组合结构共同工作的措施。通过施工过程检测和模拟使用荷载的堆载试验进行结构验证。结果表明:该组合结构是活荷载较大及荷载变化较频繁的大悬臂结构、大跨度梁、大偏心柱、转换结构等的优选结构方案;高效预应力技术是保证组合结构共同工作的主动措施;型钢强迫位移法施加的有限预应力,可充分发挥型钢的抗拉强度,改善结构的抗裂和变形性能。
Through the engineering practice of the cantilever structure of 11.5m in Jiyuan Basketball City of China, the structure scheme and design method of steel, bonded and unbonded prestressed concrete composite components are expounded, and the vertical tension and the prestress level of the composite structural steel are discussed Pull the combination of tension programs and work together to ensure that the combination of structural measures. Structural verification was carried out by testing and simulating loads during the construction process. The results show that the composite structure is a preferred structure scheme of large cantilever structure, large span beam, large eccentric column and conversion structure with large live load and frequent load changes. High-efficiency prestressing technology is the active measure to ensure the joint structure work together The limited prestress imposed by the forced displacement of the profile steel can give full play to the tensile strength of the profile steel and improve the crack resistance and deformation performance of the structure.