某车辆段超长盖板结构温度应力分析与设计

Temperature Stress Analysis and Design of Super Long Cover Plate Structure of a Rolling Stock Section

广州地铁某车辆段超长盖板采用现浇钢筋混凝土结构,基础采用旋挖灌注桩基础。盖板结构长约515 m,宽约380 m,属于超长结构。结构设计中通过设置后浇带、永久变形缝,结合施工及使用阶段全过程模拟计算,并采用应力增量法配置温度应力钢筋等措施,减小了温度作用和收缩变形对钢筋混凝土超长结构的不利影响。计算结果表明,降温荷载在绝大部分框架梁、柱温度应力值较低;楼板中产生较大拉应力,楼板开洞部位、塔楼周边区域等位置拉应力集中;剪力墙墙体中部、上部单元拉应力水平低,而墙体底部应力水平相对较高。

The cast-in-place reinforced concrete structure is adopted for the super long cover plate of a rolling stock section of Guangzhou Metro,and the foundation is rotary excavation cast-in-situ pile.The plane scale is 515 m×380 m which means that the structure is a super long one.The adverse effect of temperature and shrinkage strain on the super long structure is reduced by structural calculations,setting alter-pouring strips and permanent deformation joint,combining with the whole process simulation calculation of construction and use stage,and adopting the stress increment method to configure temperature stress reinforcement.The calculation result indicates that:the temperature-reducing loading produces a relatively less tension stress to frame beams and columns;there is tension stress concentration in the opening of the floors and the Perimeter around the tower;the less tension stress appear at the middle and upper part of the shear wall,while the high one appear at the bottom.