Developing of robot flexible processing system for shipbuilding profile steel

A robot flexible processing system of shipbuilding profile steel was developed. The system consists of computer integrated control and robot. An off line programming robot was used for marking and cutting of shipbuilding profile steel. In the system the deformation and position error of profile steel can be detected by precise sensors, and figure position coordinate error resulted from profile steel deformation can be compensated by modifying traveling track of robotic arm online. The practical operation results show that the system performance can meet the needs of profile steel processing.

Torsional behavior of triangular web profile （TRIWP） steel section by experimental study

A triangular web profile （TriWP） is a modified section where the flanges are connected to a web plate of triangular profile. This study examined the torsional behavior of TriWP steel sections and compared to that of the fiat web （FW） steel sections. Three types of specimen sizes were used： 180 mmx 75 mm × 5 mm× 2 mm, 200 mm × 100 mm× 8 mm ×6 mm, and 200 mm× 100 mm × 6 mm× 5 mm. All the specimens were loaded vertically until the maximum load was achieved and then the load was released. For both types of specimens, it was observed that the torsional rotation for bigger size [200 mm× 100 mm× 8 mm × 6 mm] were smaller than that of smaller size [ 180 mm × 75 mm×5 mm× 2 mm] of the specimens. At the maximum torsional loading, the experimental result was compared to the theoretical calculation. The comparison showed that the percentage difference ranged from 1.10% to 16.80%. From the graph of torsional load versus rotational angle, the torsional rotation for all TriWP steel sections were smaller than that of the FW steel section under the same torsional loading i.e., 0.2 kNm and 1 kNm. The range between FW and TriWP were 3.74 to 71.83 at 0.2 kNm while 14.5 to 75.1 at 1.0 kNm. The findings were shown that the TriWP steel sections had better resistance against torsion in comparison to FW steel section.

Experimental study on seismic behavior of mid-rise RC shear wall with concealed truss

In this paper,mid-rise shear wall with concealed truss was proposed.This new composite shear wall includes two kinds of composition:one is the composition of two bearing systems,including truss and shear wall,and the other is the composition of two materials,including steel and concrete.Therefore,it is a double composite shear wall.The experimental study on the seismic behavior of six 1/3 scale mid-rise shear walls,including an ordinary mid-rise shear wall,a mid-rise shear wall with steel frame,and four mid-rise shear wall with concealed truss made of different materials,was studied.Based on the experimental study,the stiffness and its attenuation,bearing capacity,ductility,hysteretic property,energy dissipation,and failure phenomena of each shear wall were contrastively analyzed.The formulas of bearing capacity and stiffness were established.The results obtained from the formulas and those from experiment are in good agreement.Some suggestions for seismic design of shear wall are given in this paper.The experimental results show that the seismic behavior of the mid-rise shear wall with steel frame and that of every truss with different materials is obviously improved.