第二章是预备知识，介绍了锥、锥凸集值函数、切锥与集值映射的切导数等的相关知识。
In chapter 2, we introduce the knowledge that the paper use, introducing these conception of cone, cone convex set-valued maps, tangent cones, and tangent derivatives of set-valued mapping, etc.
然后利用正切锥方向导数定义一类正切锥F 凸函数类，并给出了（VP）正切锥真有效解的充分性条件；
Then, we define a class of tangent cone F convexity in terms of the tangent cone directional derivative, and prove the sufficient optimality conditions for (VP).
该变形反映了板在各个受力阶段的抗弯性能，也在很大程度上直接影响着冲切锥面上的应力分布和板的抗冲切能力。
The deformation not only reflects the flexure behavior of slab at every loading stage, but also affects the stress status on the surface of punching shear cone and the ultimate capacity of the slab.
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