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对于超长钢筋混凝土框架结构,变温的作用常常导致混凝土梁和楼板的开裂。采用SAP2000有限元软件对某一超长钢筋混凝土框架结构厂房在降温作用下的结构温度应力进行了计算分析,并得到其分布规律。为了减小超长混凝土框架结构的温度效应,在结构中设置剪力墙、膨胀带、伸缩缝三种不同构造措施,通过有限元计算发现采用膨胀带和伸缩缝能够明显减小楼面混凝土的主拉应力和框架柱的侧移,结构中设置剪力墙虽然可以减小框架柱的侧移,但楼板混凝土的主拉应力急剧上升造成混凝土的开裂。最后,基于有限元分析的结果,提出在设计和施工阶段超长钢筋混凝土结构温度裂缝控制的具体措施。
For very long reinforced concrete frame structures, the effect of temperature changes often leads to the cracking of concrete beams and slabs. Using SAP2000 finite element software to calculate the structure temperature stress of a super-long reinforced concrete frame structure under cooling effect, and get its distribution law. In order to reduce the temperature effect of the super-long concrete frame structure, three different structures of shear walls, expansion belts and expansion joints are set in the structure. Finite element calculation shows that the use of expansion belts and expansion joints can significantly reduce the concrete floor The main tensile stress and the lateral displacement of the frame column, although the shear wall in the structure can reduce the lateral displacement of the frame column, the main tensile stress of the slab concrete rises sharply and causes the cracking of the concrete. Finally, based on the results of finite element analysis, the concrete measures to control the temperature cracks in the ultra-long reinforced concrete structures during the design and construction phases are put forward.