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对平面形状为圆环形的混凝土框架结构在季节温差作用下构件的温度应力进行了研究。从理论上分析了圆环形混凝土框架结构在温度作用下结构变形、梁板中径向应力、环向应力、柱中应力特点,并通过算例进行了计算验证。研究结果表明:圆环形混凝土框架结构裂缝控制的重点为梁板中的环向应力和柱中应力。梁板中环向应力大小与径向位移约束系数成正比,环向应力自外环至内环逐渐增加,可能引起自内环开始的径向放射状通缝;柱根尤其是边柱柱根承受较大弯矩,可能产生严重的弯曲裂缝甚至破坏,需加强配筋满足裂缝控制要求。
The temperature stress of the member under the effect of seasonal temperature difference was studied on the circular frame-shaped concrete frame structure. The structural deformation of ring-shaped concrete frame structure under temperature, the radial stress, hoop stress in the beam plate and the stress in the column are analyzed theoretically. The calculation and verification are carried out through examples. The results show that the key points of the crack control of circular ring concrete frame are the hoop stress in the beam and the stress in the column. The magnitude of the hoop stress in the beam plate is proportional to the radial displacement restraint coefficient, and the hoop stress gradually increases from the outer ring to the inner ring, which may cause radial radial through joints starting from the inner ring. The column root, especially the edge column root, Large bending moments may cause severe bending cracks or even damage, and the reinforcement should be reinforced to meet the requirements of crack control.