粘钢加固混凝土梁的解析分析

Analytical Solutions for R/C Beams Strengthened by Externally Bonded Steel Plates

本文限据弹性梁理论和部分组合截面假定，对受３种荷载作用的粘钢加固混凝土简支梁，推导出钢板与混凝土梁之间的粘结剪应力和法向应力的解析解．还给出钢板拉应力和加固梁挠度的解析解．由例题梁的计算分析，得到了降低钢板端部处应力集中的方法（采用刚度较低的粘结剂层）．

The analytical golutions of the bond shear and normal stresses in the adhesive layer between R/C beam and steel plate, as well as solutions of the tensile stress in steel plate and the deflection for a simple beam strengthened by steel plate subjected to three different patterns of loading are presented. The stress distributions, the stress concentration at the ends of steel plate, and the deflection at the centre, as well as the anchorage and peeling lengths can be predicted with these formulae. Several factors affecting the bond stresses and the behaviour of strengthened beam are investigated. It is found that the ultimate bond shear and normal stresses at the ends of steel plate can be decreased by using an adhesive layer of lower stiffness (lower elastic modulus and higher thickness).