On the basis of soil classification of plasticity chart,some regression relationships between the basic value of fine grained soil bearing capacity and the specific penetration resistance of CPT are established.

In this paper plasticity chart theory was appliedto Shaanxi special soils (loess,Hipparion red clay and swelling soil etc.

By adoption of yield line theory, the author analyses the bearing capacity of square slabs reinforced with carbon fibre reinforced plastic (CFRP) or steel strips and improves Zhang Jiwen s yield line pattern.

Based on the result, the authors put forward the yield line distribution trait:leaning direction of the yield line is within the interval (0°,45°].

The yield line pattern and strength of the plated RC slabs subjected to a uniformly distributed load are analyzed and calculated by employing yield line method,and furthermore,a practical design procedure and corresponding designing tables are also proposed.

In this paper,the failure mechanism of a special shape reinforced concrete slab under uniformly distributed loading,was established based on the plastic hinge line theory,and the temperature field in slab was determined by using the finite difference method.

A simplified calculation method was also given,in which plastic hinge line model was used.