【Weekly Topic】【Civil Engineering Version 20170612】
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Participation reward: 2 Wealth. Correct reward: 6 Wealth. The methods of connecting rebar are ( ). a. Welding b. Mechanical joining c. Bolting d. Tying joint e. Chemical bonding 【Answer】abd
The connection methods for steel bars are (ABD). a. Welding b. Mechanical joining c. Bolting d. Tying joint e. Chemical bonding
In the US, there are three types of connections: mechanical connections, welded connections, and tied connections. 1. Joints of stressed reinforcement bars should be located in areas with lower stress. It is not advisable to have two or more joints on the same longitudinal stress-reinforcing bar. The distance from the end of the joint to the starting point of the steel bar’s bend should not be less than 10 times the diameter of the steel bar. 2. If bond joints are used, the bond joints of the longitudinal stress-bearing rebars adjacent to each other should be staggered. The length of the connection zone for steel bar lacing joints is 1.3 times the lap length. All lap joints whose center point lies within that section belong to the same connection section. The percentage of joints in the tensile steel bars located in the same connection section is 25%. 3. When the diameter of the tensile steel bars is greater than 28 mm and the diameter of the compressive steel bars is greater than 32 mm, bond joints should not be used; welding or mechanical connections are preferred.