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提出3种无柱大空间预应力区间结构方案,并选取预应力密排框架箱形结构方案。针对该方案,通过完成内张拉预应力技术研究、有限元计算分析优化、结构构件设计计算和验算、新方案和普通方案构件承载力设计值与荷载效应组合设计值的对比等,得出预应力密排框架箱形结构方案设计安全可靠,可满足地铁明挖区间无柱大空间区间隧道要求,并为地铁明挖无柱大空间车站结构设计提供借鉴。
Proposed three kinds of non-column large space prestressed interval structure scheme, and select prestressed dense-row frame box structure scheme. According to the program, through the completion of internal tensile prestressed technology research, finite element analysis and optimization, structural component design calculation and checking, the new program and common program components bearing capacity design value and load effect combination design value comparison, etc., The design of box structure with stress-tight frame is safe and reliable, which can meet the requirement of large-area tunnel without column space in underground excavation section of subway and provide reference for structural design of large-