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某商业中心地下汽车库采用了宽扁梁和平板柱多层预应力混凝土结构,在可利用的地下建筑空间内比普通混凝土结构多建了1层车库。其人防、消防等偶然荷载远大于正常使用荷载,使得预应力混凝土构件抗裂设计在这两种荷载下很难同时满足设计要求,以优先满足正常使用荷载,辅以普通钢筋增强构件的延性来满足偶然荷载下的设计要求。采用塑胶管、直线形布筋方式减小预应力摩擦损失。宽扁梁结构的梁柱节点予以加强,以保证楼面荷载的顺利传递。
A commercial center underground garage uses wide flat beams and slab columns of multi-layer prestressed concrete structures, in the available underground space more than ordinary concrete structures to build a garage. The accidental loads such as air defense and fire control are much larger than the normal loads, making the crack resistance design of prestressed concrete members difficult to meet the design requirements at the same time in order to give priority to meet the normal load, supplemented by ordinary steel to enhance the ductility of members Meet the design requirements under accidental loading. Plastic pipe, linear reinforcement method to reduce prestressed friction loss. Beam-column joints with wideflat beams should be strengthened to ensure the smooth transfer of load on the floor.