Lightweight Concrete for High Strength - Expanded Shale & Clay
Lightweight Concrete for High Strength - Expanded Shale & Clay
Lightweight Concrete for High Strength - Expanded Shale & Clay
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Table 5.9 lists the results of all tests; Table 5.10 lists only the tests that exhibited a shear,<br />
shear-slip or shear-flexure failure. Both tables show the AASHTO Standard technique produced<br />
conservative results overall. Limiting the yield strength to 60 ksi caused the prediction to be<br />
slightly more conservative. The AASHTO LRFD technique produced more conservative results<br />
overall because the girders with 24-inch spacing were predicted to carry much less shear. The<br />
AASHTO LRFD penalized those girders with a very low concrete strength relative to the<br />
AASHTO Standard procedure.<br />
Test<br />
#<br />
V c-EXP<br />
Exp.<br />
Table 5.8 Overview of Initial Cracking Shears<br />
V cw<br />
AASHTO<br />
Standard<br />
(kips)<br />
V cw<br />
ACI<br />
Alternate<br />
(kips)<br />
V c<br />
AASHTO<br />
LRFD<br />
(kips)<br />
Percent<br />
Diff.<br />
Exp. vs.<br />
Standard<br />
Percent<br />
Diff.<br />
Exp. vs.<br />
ACI Alt<br />
Percent<br />
Diff.<br />
Exp. vs.<br />
LRFD<br />
(kips)<br />
G1A-E * 145.0 104.1 124.0 24.7 39.4% 16.9% 488%<br />
G1A-W 120.0 107.1 127.5 26.3 12.1% -5.9% 356%<br />
G1A-C * 134.0 98.5 118.0 23.5 36.1% 13.6% 470%<br />
G1B-E * 140.0 105.5 125.5 24.7 32.7% 11.6% 466%<br />
G1B-W 141.2 103.9 123.6 24.3 35.9% 14.2% 482%<br />
G1B-C * 136.1 98.9 118.4 25.0 37.6% 14.9% 445%<br />
G1C-E * 123.5 101.5 120.7 23.6 21.7% 2.3% 423%<br />
G1C-W 134.2 104.0 123.3 23.6 29.0% 8.8% 468%<br />
G1C-C 94.0 96.7 115.8 24.6 -2.8% -18.8% 282%<br />
G2A-E 178.6 114.4 135.7 26.0 56.1% 31.6% 588%<br />
G2A-W 157.3 118.1 139.5 28.8 33.2% 12.8% 447%<br />
G2A-C * 140.0 109.4 130.6 25.0 27.9% 7.2% 460%<br />
G2B-E 163.1 114.6 136.1 25.2 42.3% 19.8% 549%<br />
G2B-W 148.0 117.4 138.7 25.8 26.1% 6.7% 473%<br />
G2B-C * 120.4 110.5 131.9 25.2 9.0% -8.7% 377%<br />
G2C-E 143.4 112.0 133.0 25.6 28.1% 7.8% 461%<br />
G2C-W 122.4 113.4 134.2 27.1 8.0% -8.8% 352%<br />
G2C-C 107.0 107.3 128.1 31.3 -0.2% -16.5% 241%<br />
G1 Avg 129.8 102.2 121.9 24.5 26.8% 6.4% 431%<br />
G2 Avg 142.2 113.0 134.2 26.7 25.6% 5.8% 439%<br />
G1 Std Dev 14.1% 11.9% 68.9%<br />
G2 Std Dev 17.8% 15.2% 104.1%<br />
* Girder failed in shear at ultimate as primary or secondary failure mode<br />
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