静力场

计算了有限元模型的静力场，在此基础上，采用二维弹塑性动力有限元方法进行列车振动响应分析，计算中围岩材料采用D-P模型。

Use the finite element model to calculate the static field , on this basis , the use of two-dimensional elastic-plastic dynamic finite element method analysis of vibration response of the train , the calculation of rock material using DP model .

根据下限定理，构造了满足完全平衡条件、边界条件和屈服条件的静力许可场；

The block-structural plane model is used for constructing the statically admissible stress fields which satisfy the equilibrium conditions , boundary conditions and yield criteria .

将条分法归结为一个静力许可场中的大规模极值问题，然后应用改进的模拟退火算法求解，结果表明收敛性良好。

The slice method is reduced into a large-scale extremum problem in static permission field , and the results of the extremum problem solved by the improved annealing simulation algorithm show that the convergence of solution is very good .

再次，在静力分析和热场分析的基础上，对新型成型模具进行了热-力耦合分析。

Thirdly , thermo-mechanical analysis of the new mould is carried out based on the static analysis and thermal field analysis .

在大步长情况下，在收敛域内最大载荷低于结构真实的极限承载力；对应的应力场是一个静力容许应力场；

When large load steps are used , the maximum load applied is lower than limit load in structure , the calculated stress field is an static admissible one .

第三章在极限分析下限定理的基础上，运用有限单元法建立静力许可应力场，并构建三维有限元塑性极限分析数学规划模型；

In the third chapter , the statically admissible stress field is found by finite element method ( FEM ) . The 3-D finite element plastic limit analysis mathematical model is established on the basis of the lower bound principles of limit analysis .

在下限法中，考虑平衡条件、应力边界条件、屈服条件以及应力间断条件，求得了超载系数和强度储备系数的下限值及相应的静力容许应力场。

In the approach of determining the lower bound , the conditions of equilibrium , stress boundary , yielding and stress discontinuity are considered , and the overload factor and strength safety coefficient of the gravity dam as well as the corresponding statistical permissible stress field also can be obtained .