地下通道大跨度接口梁受力分析

Stress Analysis on Longspan Entrance Beam of Underground Passage

地下通道接口梁在跨度很大时,处于弯、剪、扭复合受力状态。接口梁的跨度大,且荷载大,板墙的厚度也相应较大,其实际受力情况复杂。建立了更接近真实受力状态的三维模型来计算接口梁的弯矩、剪力及扭矩。由该模型计算所得的弯、剪、扭分布规律,与采用常规简化计算得到的值差异较大,计算截面位置的内力值同样大幅小于常规简化计算的内力值。

The longspan entrance beam of underground passage is subjected to bending shear and complex stress state due to the large span, high load, thick slab and supporting wall. In this paper, a 3D model imitating the real state of stress is built to calculate the internal forces of the longspan beam, such as the bending moment, shear force and torque. The internal forces of the model are quite different from the forces calculated by conventional and simplified calculation methods. The value of internal forces on the section position is also significantly smaller than that of the conventional and simplified calculation methods.