预应力梁开裂后的静力挠度特性分析

Analysis on static deflection characteristics after prestressed girder cracking

从预应力混凝土梁的实测弯曲裂缝参数着手,将主梁划分为阶梯形刚度分布梁,基于裂缝特征计算开裂预应力混凝土梁各开裂区段的有效刚度,给出了基于阶梯形刚度特征的开裂预应力混凝土简支梁挠度的计算方法,计算出各级荷载下开裂预应力混凝土梁的挠度,并与试验值进行对比,得出了有指导意义的结论。

Starting form the actual examination bending parameter of prestressed concrete girder,it classifies main girder into ladder-type stiffness distributing beam,and calculates effective stiffness at prestressed concrete girder cracking section based on crack features,and shows prestressed concrete simple support beam cracking calculation method based on ladder-type stiffness characteristics,and calculates the defection of cracking prestressed concrete beam under different loads,and compares them to experimental values,and achieves conclusions with guiding significance.