Issue 64

H. Zine Laabidine et alii, Frattura ed Integrità Strutturale, 64 (2023) 186-203; DOI: 10.3221/IGF-ESIS.64.12

TCC strength F max (kN)

50

Maximal service load F ser (kN)

K i

K ser

Typic curve

25 Load (kN)

0

20 mid ‐ span deflection (mm) 40

0

60

maximal service deflection d= L/300 (mm)

Figure 18: Typical load–mid-span deflection curve of the under-designed TCC beam.

Connection

Location (mm)

K i (N/m)

K ser (N/m)

F max (kN)

Loss in stiffness Failure category

2000 2500 3000 3250 3500 3750 4000 2000 2500 3000 3250 3500 3750 4000 2000 2500 3000 3250 3500 3750 4000 2000 2500 3000 3250 3500 3750 4000

1007 1147 1172 1143 1090 1021 917 1098 1210 1252 1214 1152 1066 954 1138 1278 1288 1245 1177 1085 966 1165 1308 1314 1267 1193 1098 975

942 1024 1062 1057 1029 981 896 1023 1133 1167 1143 1099 1035 937 1065 1196 1220 1193 1144 1067 957 1099 1232 1249 1219 1165 1082 960

6% 11% 9% 8% 6% 4% 2%

A A A A A A A C C C C C C C C C C C C C C C C C C C C

38.1 42.3 43.2 44.8 49.5 47.5 45.3 48.5 49.8 50.5 55.2 52.3 51.1 55.1 56.6 58.6 60.0 54.9 54.8 58.6 60.6 61.8 63.0 50.3

R50

7% 6% 7% 6% 5% 3% 2% 6% 6% 5% 4% 3% 2% 1% 6% 6% 5% 4% 2% 1% 2%

R100

R150

R200

B Table 7: The extracted values of initial bending stiffness, elastic strength and ultimate strength.

Initial bending stiffness and service bending stiffness The TCC beams achieve the maximal initial bending stiffness K i and the maximal service stiffness K ser in all locations with the notch connection R200. Because of the long length, the TCC beams have high stiffness and strength. In all cases, the TCC beams with long notches in the same location always exhibit a higher initial bending stiffness Ki and also a higher service bending stiffness K ser compared to the beams with short notches. Therefore, the TCC beam with a long notch performs better in terms of stiffness.

199