第七讲介绍了矩形截面梁的计算示例,这是一种最简单、最基本的情况。我们首先介绍它,是为了使读者了解一般钢筋混凝土梁的计算步骤。但在实际工程中,T形截面梁的应用却非常广泛。这是因为:(一)现浇钢筋混凝土肋形楼盖中,梁如受正弯矩作用(上边受压、下边受拉),此时与梁整浇在一起的楼板也能同起抗弯作用,这就形成了T形截面梁。(二)梁这种 The seventh lecture introduces a calculation example of a rectangular section beam, which is the simplest and most basic case. We introduce it first, in order to make readers understand the calculation steps of general reinforced concrete beams. However, in practical projects, the application of T-section beams is very extensive. This is because: (a) In cast-in-situ reinforced concrete rib-shaped floor slabs, the beam is subjected to a positive bending moment (the upper side is under pressure and the lower side is under tension). At this time, the floor that is cast together with the beam can also resist bending. This creates a T-shaped beam. (b) Beams