某超长地下室混凝土结构无缝设计计算研究

对沈阳某超长地下室混凝土结构的温度应力进行有限元计算分析,探讨了设置与不设置后浇膨胀加强带两种情况下地下室底板、顶板和外墙温度应力的大小和分布,并提出四种方案对施工二阶段的温度应力进行控制。结果表明,设置后浇膨胀加强带后施工一阶段的温度应力有了明显的减小,施工二阶段在方案四下的温度应力减小效果显著。通过合理设置后浇膨胀加强带和温度收缩钢筋,采用补偿收缩混凝土,采用方案四对施工二阶段进行控制及在环境温差、材料、混凝土生产技术和施工等角度做好控制,本超长地下室可不设置伸缩缝。

DESIGN AND STRUCTURAL ANALYSIS OF AN OVERLENGTH BASEMENT CONCRETE STRUCTURE WITHOUT EXPANSION JOINT

It is studied the temperature stress of an overlength basement concrete structure in Shenyang by finite computing software.It is also explored the characteristics of temperature stress of the base board,floor and exterior wall with and without the post-pouring strengthening band.And four schemes are put forward to control the temperature stress of the second construction stage.The results show that the temperature stress of the basement with the post-pouring strengthening band according to the schemg decreases obviously.The conclusion shows that expansion joint may not be set on the overlength basement through setting the post-pouring strengthening band and temperature shrink reinforce ment reasonably,adopting the shrinkage-compensating concrete,adopting the fourth scheme to control the second construction stage,along with doing a good job in temperature difference,materials,production technology of concrete and construction.