有粘结后张预应力悬挑梁设计方法
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摘要
工程设计中,多层或高层房屋端部常遇到悬挑梁结构,悬挑跨度达到4,5m甚至6m以上。当作用较大活荷载或墙载时,采用普通钢筋混凝土悬挑梁结构,梁截面高度较大,即使增大配筋量,裂缝宽度仍难满足规范限值,造成结构耐久性降低,影响结构安全,此时采用预应力悬挑梁结构是最合理的结构方案。介绍适合手算的预应力悬挑梁设计计算方法和施工详图构造,供设计参考。
In engineering design,cantilever beam structure is common at the end of multi-story or high-rise housing structure,with cantilever span of 4 m,5 m or even 6 m above. When the large live load or wall load is exerted,the use of ordinary reinforced concrete cantilever beam structure leads to large beam section height. Even if the amount of reinforcement is increased,the crack width is still difficult to meet the code limits,resulting in decreased durability of the structure and affecting the structural safe. The prestressed cantilevered beam structure is the most reasonable structural scheme. The design calculation methods and construction details of prestressed cantilevered beams suitable for hand computation were introduced for the reference of design.
In engineering design,cantilever beam structure is common at the end of multi-story or high-rise housing structure,with cantilever span of 4 m,5 m or even 6 m above. When the large live load or wall load is exerted,the use of ordinary reinforced concrete cantilever beam structure leads to large beam section height. Even if the amount of reinforcement is increased,the crack width is still difficult to meet the code limits,resulting in decreased durability of the structure and affecting the structural safe. The prestressed cantilevered beam structure is the most reasonable structural scheme. The design calculation methods and construction details of prestressed cantilevered beams suitable for hand computation were introduced for the reference of design.
引文
[1]混凝土结构设计规范:GB 50010—2010[S].北京:中国建筑工业出版社,2011.
[2]陶学康.后张预应力混凝土设计手册[M].北京:中国建筑工业出版社,1996.
[2]陶学康.后张预应力混凝土设计手册[M].北京:中国建筑工业出版社,1996.