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1·When HRB500 steel bars used as stirrup, the reinforced concrete beam may appear so oversized diagonal crack that it can't satisfy the engineering requirements for applicability and durability.

应用HRB500钢筋作为抗剪箍筋，可能会出现过宽的斜裂缝而不能满足结构的适用性和耐久性的要求。

2·Calculating the continuous beam, frame of single-span and multi-story by deflection method, the stiffness matrix is symmetrical three-diagonal.

用位移法计算连续梁、对称性荷载作用下的单跨多层刚架，总刚度阵为对称三对角阵。