多纵梁斜交渡槽水荷载横向分配研究

Water Load Transverse Distribution of Multi-longitudinal Beam Skew Aqueduct

根据大型多纵梁矩形渡槽槽身结构及其受力特点,利用实用空间分析法,使复杂的空间结构计算分离成相互联系的两个平面问题.横向计算中,底部弹性支承在各纵梁上,可求得结构的弹性支承反力,其值即为水荷载在各主梁之间的横向分配.通过对某渡槽的计算表明:对于多纵梁斜交渡槽,当横梁与纵梁正交设置时,随着斜交角度的增大,在跨中位置边纵梁分配的荷载逐渐变大,而中纵梁分配的荷载逐渐变小,这可充分利用侧墙刚度大的特点,从而增加渡槽的跨越能力,在多纵梁斜交渡槽设计中应优先采用.

The practicality space analysis method is brought forward according to the structure endure force character of large rectangle aqueduct bridge with multi-longitudinal beam. The method makes complicated space structure calculation decompounding into a couple of related plane problem. The bottom structure elasticity is supported by every longitudinal beam in cross calculation, and the elasticity supporting force is obtained. The elasticity supporting force is regarded as water load transverse distribution on longitudinal beam. The calculating of a aqueduct shows that as far as skew aqueduct which crossbeam is uprightness longitudinal beam and with skew angel increases, the load distribution on side beam increases while the load distribution on middle beam decreases. This type aqueduct should be adopted firstly, because the span of aqueduct becomes long.