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T形截面梁,特别是现浇连续板构成的T形梁,计算翼缘宽度较宽,抗弯、抗剪能力较强,而矩形截面梁,因无上翼缘,虽有空心板铺设,但不能考虑其参与共同受力,只能按矩形截面考虑,其抗弯、抗剪能力不如T形截面梁。 以某商场营业楼为例该营业楼6层框架结构,柱网尺寸为6.6m×7.8m,1～6层为现浇框架柱、梁、次梁,楼板为现浇连续板,板跨为3.9m,梁板构成T形截面梁。施工中,施工单位为了减少模板工作量,将1层顶板改为空心板,梁改为矩形截面梁(图1)。当1层顶框架梁、次梁模板已支好,钢筋已全部绑扎完毕,正准备浇筑混凝土时,发现这一变更。T形截面梁高为650mm,改为矩形截面仍然为650mm,梁高虽一样,但由于T形截面变成了矩形
The T-section beam, especially the T-beam formed by cast-in-place continuous plates, has a wide calculated flange width, strong bending and shear resistance, and a rectangular section beam, due to its unalloyed flange, despite the hollow slab laying, However, it cannot be considered that it participates in common forces. It can only be considered in terms of a rectangular section, and its bending and shear resistance is inferior to that of a T-section beam. Taking a shopping mall business building as an example, the business building has a 6-story frame structure, the column net size is 6.6m×7.8m, and 1 to 6 floors are cast-in-place frame columns, beams, and secondary beams. The floor slabs are cast-in-place continuous slabs. 3.9m. The beam forms a T-section beam. During construction, the construction unit changed the 1st floor slab to a hollow slab in order to reduce the work load of the formwork, and the beam was changed to a rectangular section beam (Fig. 1). When the first-floor top frame beam and the secondary beam formwork have been properly supported, the reinforcement has been fully banded and the change is found when the concrete is ready to be poured. The T-section beam height is 650mm, and the rectangular section is still 650mm. The beam height is the same, but the T-section becomes a rectangle.