计算断裂失稳性时，必须考虑焊接或轧制残余应力，恒载应力和活载应力之总和。
To evaluate fracture instability, the total sum of stresses due to residual welding or rolling stresses, dead load, and live loads must be considered.
另外，分析比较了一座直线多室箱梁桥在不同支承方式下恒活载效应、预应力效应、次反力和二次内力的异同。
Additionally, the difference of total effect and secondary forces due to prestressing tendons under two kinds of boundary conditions is given.
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。
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.
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。
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。
The deflection and stress of the structure are linear with load under effect of live load. The superposition principle can be used.
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