Study On The Sma Smart Control System Of Reinforced Concrete Beam

Shape memory alloy (referred to SMA) is a kind of multi-functional characteristics of smart materials, with a good shape memory effect, super-elastic effect, high damping properties, resistance characteristics, anti-fatigue effect, good resistance to corrosion and other characteristics.Stretch them to some extent at normal temperature and rise temperature of them, martensite inverse phase change may occur, and then they may get back to their original shape. Structural deformation may be controlled and restored with the use of shape memory alloys and shape memory effects, and concrete split beams and fissures may be decreased or even closed.Based on the SMA smart structure as the research object, a systematic study of reinforced concrete beams control systems theory and methods with in vitro shape memory alloys、in vivo unbonded shape memory alloys and in vivo bonded shape memory alloys has been done.The main contents are as follows:(1) The paper studies the damage control mechanism of SMA Smart reinforced concrete beam. It analyzes the deflection, stress response performance,and maximum crack width variation in vitro shape memory alloys、in vivo unbonded shape memory alloys and in vivo bonded shape memory alloys before and after heating the driver.(2) The SMA smart concrete beam analysis model, established with the finite element software ANSYS, analyzes the SMA smart concrete beam damage control.It studies the regularity about some elements such as the SMA tendons, the initial pre-strain value, SMA and the beam bottom distance and other factors of in vitro shape memory alloys、in vivo unbonded shape memory alloys and in vivo bonded shape memory alloys.