Internal force calculation of simply supported beam under vehicle load 汽车荷载作用下内力计算 Calculate the mid-span cross section of bending-moment for the simple supported beam bridge under vehicle live load.The bridge Calculated span is 20m and vehicle live load level is Highway-I loading. 计算跨径20m的桥,承受公路-I级汽车荷载作用,求跨中弯矩。