To investigate the mechanical behavior of cast-in-situ two-way concrete slabs reinforced by cold-rolled deformed bars with double-wing,the test of two cast-in-situ two-way concrete slabs subjected to vertical uniform loads is carried out.

To understand the mechanical behaviors of cast-in-situ concrete slabs reinforced by cold-rolled deformed bars with double-wing, an experiment of two-way sla.

Study on mechanical properties of cold-rolled steel rod;

Advantages and application of cold-rolled-twisted bar;

The manufacturing technology, stress conditions, construction rules and reinforcement calculation of the laminated floor slabs with cold-rolled-twisted bar are investigated in this paper.

During the application of cold-rolled and twisted bars,not only should it pledge bars strength and ductility,but also it should fulfill requirements of bars standard thickness and panel length.

The pulling and extracting tests of the cold-rolled and twisted bars and experiments on these bars members have all proved that these bars possess comparatively superior ductility and bondability.

Study on several question existed in tensile test of cold-rolled and twisted bars;

It can make construction quick and convenient,and can save the quantity of bars 42 percent that cold-rolled and twisted bars instead of grade Ⅰ bars used in concrete slab.