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一、外伸梁支座负弯矩钢筋的配置方法在我国南方地区的装配式楼(屋)盖中,经常采用预制板(空心板或平板)和现浇外伸梁结构。由于使用要求,梁的纵剖面常取图1所示形式。支座处负弯矩钢筋的配置有时出现如下错误:(1)在支座截面高度变化处采用连续弯折形钢筋(图2),梁受力后,将在连续弯折处产生向外的合力(图2箭头所示),使混凝土崩落。 (2)在支座
First, the configuration method of the negative bending moment support of the outrigger bearing In the prefabricated building (house) cover of southern China, the prefabricated plate (hollow plate or slab) and the cast-in-place beam structure are often used. Due to the requirements of use, the longitudinal profile of the beam often takes the form shown in Figure 1. The configuration of the negative moment reinforcement steel at the support sometimes has the following errors: (1) Continuous bending-shaped steel bars (Fig. 2) are used where the cross-sectional height of the support is changed. After the beams are subjected to force, they will generate outward resultant forces at continuous bending points ( As shown by the arrow in Figure 2, the concrete is broken down. (2) In the bearing