CEMP-E
TI 809-26
1 March 2000
d. Joint Selection. Several types of details may be used to achieve satisfactory moment connection
performance in high seismic applications. Enhanced quality, improved and reinforced details are
recommended for conventional-type connections. See (e) below. For Reduced Beam Section (RBS)
system connections, also called the "dogbone" system, current AISC guidelines should be followed. See
Appendix D, Bibliography. Several limitations have been found in the cover-plated and ribbed details,
and further investigation of the latest recommendations should be made prior to use.
e. Joint Detail Modifications and Enhancements. Current recommendations include the following
modifications to the previous standard beam-to-column connection: (1) removal of bottom flange backing
bar, backgouging of the root, and placement of a reinforcing fillet, (2) improved quality of the weld
access hole, (3) removal and finishing of weld tabs, (4) control of profile and quality of the access hole,
(5) use of partially or fully welded web connections. The exact requirements for access hole provisions
and web welding depend upon the type of connection used and the design application, whether Special
Moment resisting Frame (SMRF) or Ordinary Moment-Resisting Frame (OMRF).
f. Inspection Enhancements. Continuous inspection of all welding performed on CJP and PJP groove
welds that are a part of the Seismic Force Resisting System is necessary. The Engineer may allow
periodic inspections when appropriate. AISC Seismic Provisions require NDT for certain joints in high
seismic applications, as follows: "All complete joint penetration and partial joint penetration groove
welded joints that are subjected to net tensile forces as part of the Seismic Force Resisting Systems ...
shall be tested using approved nondestructive testing methods conforming to AWS D1.1." Such testing
should include ultrasonic testing of welds in T-joints and butt joints over 8 mm (5/16 in.) in thickness.
Radiographic testing may be used in some cases using butt joints. When using T-joints, with the
thickness of the tee "flange" exceeding 40 mm (1-1/2 in.), ultrasonic testing should be performed after
completion and cooling of the weld to check for lamellar tearing.
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