论文部分内容阅读
本讲介绍国外预应力混凝土梁的剪力与扭力计算,并举例说明有关规范公式的应用及与试验结果的比较。目前英国、美国和欧洲规范认为,验算剪力和设计剪力配筋,以预应力混凝土构件在破坏极限状态时的性能为基础。这是因为箍筋和其他剪力钢筋,是在混凝土抗剪力耗尽时才起有效作用。如果一个截面上的极限剪力是V_u,而混凝土能承受的剪力是V_c,则需要的剪力配筋应按承受剩余剪力V_u-V_c来设计。
This paper introduces the shear force and torsional force calculations of foreign prestressed concrete beams, and gives an example of the application of the relevant normative formulae and comparison with the test results. The current British, U.S., and European regulations believe that checking shear forces and designing shear reinforcements are based on the performance of prestressed concrete members when they are in a limit state. This is because stirrups and other shear reinforcements are effective when the shear resistance of concrete is exhausted. If the ultimate shear force on one section is V_u and the concrete can withstand V_c, the required shear reinforcement should be designed to withstand the residual shear force V_u-V_c.