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。
2
Based on the universal finite element analysis software ANSYS, a spatial model of the bridge is built and the stress distribution under the liveload on main sections is analyzed.