fertred.blogg.se

1. #NO CONTACT BAR MANUAL#
2. #NO CONTACT BAR CODE#
3. #NO CONTACT BAR CRACK#

This is a mechanical splice consisting of a coupler with internal straight threads at each end that joins two upset end reinforcing bars with matching external threads. Special hardware permits use for end anchorages in concrete or connection to structural steel members. Alternatively, the lock nuts can be omitted when the bars can be torqued together. Splices are assembled with lock nuts and threaded couplers, then the nuts are tightened to a specified torque. This is a mechanical splice that requires special bars with thread-like rolled, deformations over their entire length which meets ASTM A615. CRSI recommends against connecting crossbars by small arc welds, known as "tack welds." Tack welding is a factor associated with brittle failure of rebar assemblies.

#NO CONTACT BAR CODE#

While the welding code is a comprehensive document, other important items such as securing chemical analysis of the steel, field inspection, super-vision, and quality control are required for a project with welded reinforcement. Properly engineered and constructed welded splices require more considerations than a simple statement in the contract documents, “All welded splices shall conform to ‘Structural Welding Code – Reinforcing Steel’ (AWS D1.4/D1.4M:2011).”

#NO CONTACT BAR MANUAL#

For projects of all sizes, manual arc welding will usually be the most costly method, due to direct and indirect costs of proper inspection.

However, if necessary, field-welded splices are accomplished by electric arc welding the reinforcing bars together. In general, CRSI recommends against manual arc welding in the field. Additional information on lap splices can be found here. Lap splice lengths are always shown on placing drawings and will be found either in the details, lap charts, or in the general notes. The length of a lap splice varies with concrete strength, type of concrete, the yield strength (grade) of the reinforcing bars, bar size, bar spacing, concrete cover, and the amount of ties or stirrups.

#NO CONTACT BAR CRACK#

Non-contact lap spliced bars should not be spaced too widely apart, permitting a zigzag crack in the concrete between bars. For lap splices, contact splices are preferred for the practical reason that, when wired together, they are more easily secured against displacement during concrete placement. Simple Lap SpliceĪ lap splice is the predominant method used for splicing reinforcing bars. The architect/engineer provides location, lap length, and related information on structural drawings. Properly designed splices of individual reinforcing bars are a key element in transmitting forces through the structure and creating a load path. Reinforced concrete structures are designed to behave monolithically.