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某教学楼采用框架-剪力墙结构体系,地下1层顶部布置的跨度为32.6m大跨梁,因承担0.5m厚的覆土、自重和活载,其挠度和裂缝较大,故大跨梁采用有粘结预应力技术。在重点研究解决张拉预应力筋时预加力对挡土墙、窗井墙的内力影响较大的难题。在设计方面,采用边跨梁预应力筋张拉端布置在形心处,达到减小张拉端附加弯矩的影响;在施工方面,通过优化结构的施工顺序,采用主体整浇,挡土墙和窗井墙留缝后浇,配合预应力梁的施工,能够得到安全适用、经济合理的结构体系。
A teaching building using frame-shear wall structure system, the top of the ground floor is arranged at the top of a span of 32.6m span beam, due to bear 0.5m thick casing, self-weight and live load, the deflection and cracks larger, so the large span beam Prestressed with bonded technology. In the key research to solve the prestressed tendons tendons on the retaining wall, window wall impact of the larger problem. In terms of design, the tension beam of side span prestressing tendons is arranged at the centroid to reduce the additional bending moment of the tensioned end. In the aspect of construction, by optimizing the construction sequence of the structure, After the wall and the window wall are seamed, the construction of the prestressed beam can obtain a safe and applicable structural system with reasonable economy.