预应力在连续梁中对剪力滞效应的影响

SHEAR LAG EFFECT ON PRESTRESSED CONCRETE BOX GIRDER

箱形薄壁梁桥的剪力滞效应,目前国内外均加以研究,但对预应力与自重迭加后的效应研究得比较少。本文试图采用迭加原理解超静定结构的预加力与自重的组合影响,计算出两跨常截面连续梁在不同预加力作用下(这里采用折线配筋的方法),(N_v·θ)/(ω·e)与λ~e 及λ~c 的关系。最后得出几点初步看法,供参考。

Shear lag effect in box girder bridge has been treated by many investi-gators at home and abroad.The combined effect of prestress plus dead load hasscarcely dealed with particularly using different layouts of prestressed tendons.In this paper,applying principle of superposition,prestressed tendons withbroken straight profile in two-span continuous box girder bridge are consid-ered for its shear lag effect.The interrelations of parameter(N_y·θ/ω·e)and she-ar lag coefficients λ~c and λ~c are fully studied.Finally the outhors put forward a few remarks for further reseach work.