It analyzes the reasons of floor board vertical cracks,from emphasizing and raising cracks quality,choosing rational board side component forms,cleaning board surface,strengthening floor component quality management,brings forward the protecting measures of vertical cracks,in order to ensure the normal and safe use of floor surface.

Using ETABS software,the paper establishes the framing system models of column foot fixed and hinged staggered truss in 12 and 20 floors,and analyzes the influence of the truss chord and column on the column moment and frame displacement with different connection modes,and also considers the second-order effect of the column moment and frame displacement.

Optimization of the lateral stiffness of shear wall in mid-highrise frame-shearwall structure with special-shaped columns;

Based on the stiffness matrix,the lateral stiffness of the column is presented.

In this paper, based on the behavior of special-shaped column, the "story shear model" is built, the story lateral stiffness is deduced and compared with the rectangular column frame structure.

The requirements on wall layout are emphasized in lateral resisting stiffness calculation.

This paper presents a series of modified beam-column linear-stiffness ratio coef-ficient α formulas ,based on anaysis of the horizontal lateral resisting stiffness of thousands of realframes.