Masonry Strength Design - LRFD
Masonry Strength Design - LRFD
(OP)
I was designing a CMU Lintel Beam as a flexural member recently and decided to compare the results using the tradional elastic analysis (ASD) approach (which I have always used) and the ultimate strength design (LRFD) approach now allowed by code which considers Whiteney's stress block.
I was startled to see that there was a huge difference between the ASD and LRFD approaches. The stress ratios I was calculating using LRFD were significantly lower than the ASD approach (more than 40%). I expected the LRFD results would yield somewhat smaller stress ratios (perhaps 10-20% difference)since it is considering the true ultimate state, but I didn't expect the difference to be so pronounced.
Has anyone else noticed large differences in design using ASD & LRFD for masonry??
I was startled to see that there was a huge difference between the ASD and LRFD approaches. The stress ratios I was calculating using LRFD were significantly lower than the ASD approach (more than 40%). I expected the LRFD results would yield somewhat smaller stress ratios (perhaps 10-20% difference)since it is considering the true ultimate state, but I didn't expect the difference to be so pronounced.
Has anyone else noticed large differences in design using ASD & LRFD for masonry??






RE: Masonry Strength Design - LRFD
RE: Masonry Strength Design - LRFD
DaveAtkins
RE: Masonry Strength Design - LRFD
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I verified all of my calculations by and with the NCMA computer program... so I hope they are correct
RE: Masonry Strength Design - LRFD
I just needed a sanity check. It seems absurd that a code would present two different methods with such differing results.
Does anyone know when strength design was introduced in the masonry code?
RE: Masonry Strength Design - LRFD