ON THE EFFECTS OF CIRCULAR BOLT PATTERNS ON THE ...

Table 6-1 Types And Details Of The Sampled Specimens And
Relative Energy Dissipation
Model Name
Energy Dis.
kip.ft.rad
Energy Dis.
Variation
Tp½-Bd1¼-SQR
Tp½-Bd1¼-CIR
18.00
19.68
180.79
191.50
5.9%
Tp1-Bd1¼-SQR
Tp1-Bd1¼-CIR
19.30
21.88
386.73
446.90
15.6%
Tp1½-Bd1¼-SQR
Tp1½-Bd1¼-CIR
14.00
17.11
301.72
417.69
38.4
Tp¾-Bd¾SQR
Tp¾-Bd¾-CIR
6.60
8.10
9.98
33.41
234.6%
Tp1½-Bd¾SQR
Tp1½-Bd¾-CIR
4.50
4.60
36.01
72.48
101.3%
Tp½-Bd½-SQR
Tp½-Bd½-CIR
4.40
5.00
2.00
6.68
234.1%
Tp1-Bd½-SQR
Tp1-Bd½-CIR
4.10
4.76
7.10
13.02
83.5%
Tp1½-Bd½-SQR
Tp1½-Bd½-CIR
3.50
4.47
6.06
15.68
159.0%
* The analysis was terminated when ultimate strain was reached.
θf *
10 -3
6.2 Results And Discussions
The results and energy dissipation percentage variation between the connection with circular and
square bolt pattern are tabulated in Figure 5-7. To simplify the compression between the energy
dissipations, and study the effectiveness of geometric parameters on the energy dissipation
characteristics of the connection, these results are rearranged in respect to the nominal beam depth and
presented in Table 6-2, Table 6-3, and Table 6-4. Also the critical connections with the most affect on the
energy dissipation are highlighted in these tables. These results show that the increase in of the energy
dissipation of the connection is a function of both the end-plate thickness and the bolt diameter. Close
examination of the results and the deformed shape of the connections reveal that the energy dissipation
increase in the connections with large bolt diameter is due to the unique end-plate deformation, while this
energy dissipation increase in the connections with smaller bolt diameter is due to larger ductility of the
connection which significantly increases the area under the moment-rotation curve. These results will
discuss in details in this chapter.
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