The deflection and stress of the structure are linear with load under effect of live load. The superposition principle can be used.
活载作用下结构挠度、应力与荷载呈线性关系，叠加原理能够适用。
Based on the universal finite element analysis software ANSYS, a spatial model of the bridge is built and the stress distribution under the live load on main sections is analyzed.
利用大型通用软件ANSYS建立结构空间有限元分析模型，分析活载作用下各控制截面的应力分布规律。
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