支承在沉箱基础上的某港码头转向平台钢筋混凝土支座梁(见图1),外形与构造都比较复杂,荷载又不是全部作用在梁的顶面。梁的外伸(?)分由于跨高比很小,属悬臂深梁。这一类梁以往简单的把它作为普通的悬臂梁,以固端内力作用为配筋的依据,或按牛腿公式进行计算和配筋。事实上这类结构是不能作为杆件进行计算的,而是弹性连续体,应按平面(或空间)问题进行分析,否则内力的大小和最大的内力发生的部位与结构的真实受力情况都可能有较大的偏差。为了获得支座梁的受力特性和应力分布,我们采用了钢筋混凝土的有限元法进行应力分析。即根据钢筋和混凝土的不间形态和力学特性,分别用杆单元和平面应力三角形单元,两者直接用铰连结,构成整体力学模型。由于这两种单元的位移模式都是线性的,因此保证了 Supporting the caisson on the basis of a Hong Kong terminal steering platform reinforced concrete beam (see Figure 1), the shape and structure are more complex, the load does not all act on the top of the beam. Beam extension (?) Points due to the high ratio is very small, is a cantilever beam. In the past, this type of beam simply used it as a normal cantilever beam to the fixed end of the role of internal force as a basis for reinforcement, or according to the formula and calf calculation and reinforcement. In fact, these structures can not be calculated as rods, but elastic continuums should be analyzed according to the plane (or space) problem. Otherwise, the size of the internal forces and the location where the maximum internal forces occur and the true forces of the structures are There may be a larger deviation. In order to obtain the bearing characteristics of the beam and stress distribution, we use the finite element method of reinforced concrete for stress analysis. That is to say, according to the non-morphological and mechanical characteristics of steel bar and concrete, rod elements and plane stress triangular elements are used respectively, and the two are directly connected by hinges to form the overall mechanical model. This is guaranteed because the displacement patterns of both units are linear