无粘结预应力梁弯曲破坏极限分析

ULTIMATE ANALYSIS OF BENDING FAILURE OF UNBONDED PRESTRESSED CONCRETE BEAM

利用无粘结预应力筋在全梁范围内符合平截面假定的条件 ,对梁受弯破坏进行极限分析 ,从而求得无粘结预应力筋在梁破坏时的应力 (应变 )增量。计算结果与试验结果符合较好。方法可用于对无粘结预应力构件的精确计算和用于对无粘结预应力构件的模拟试验。

In this paper, an ultimate analysis is conducted on the flexural failure of a beam by means of the fact that an unbonded prestressing bar conforms to the assumptions on a plane section with in the range of the full beam, thus obtaining the increment of the stress(strain) of the unbonded prestressing bar at the failure of the beam. There is a good agreement between the calculation results and those of the tests. This method can be applied to accurate calculation and simulation test of an unbonded prestressed member.