预应力混凝土板梁力学特性试验研究

 岩石类材料具有较高的抗压性能和较低的抗拉性能，如何改变该类材料的特性以满足工程上的需要是急需研究的课题。通过对某高速公路高架桥上预应力混凝土板进行张拉、跨中集中荷载、均布荷载及均布荷载与跨中集中荷载共同作用等几种情况下的力学特性进行对比试验，探讨了预应力混凝土板梁在弹塑状态下的工作特性，为正确设计预应力梁板积累了经验，同时也对岩石类材料的改性问题做出了一些有益的探讨。

TESTING STUDY ON THE MECHANICAL BEHAVIOR OF PRESTRESSED CONCRETE GIRDER

Rock-like materials have high compressive strength,but low tensile one. Testing study is made on a express highway for improving these material characteristics to meet the engineering requirement. The prestressed concrete girder is pulled,and three types of load,that is,the fixed load in the middle of the girder,well-distributed and point loads on the girder,are exerted. The working characteristics of prestressed concrete girder under the states of elasto-placticity are discussed. Experience for the design of prestressed concrete girder has been accumulated and mechanical behaviors of rock-like materials have been investigated.