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https://homeguides.sfgate.com/fix-large-crack-wood-support-deck-30922.html
Cracks are common in large support beams, which are often made from a solid piece of lumber that can dry out and split. As unsightly as they are, they typically do not threaten the integrity of the beam. However, if the crack seems to be getting worse, you are repainting or you just get tired...
https://theconstructor.org/concrete/types-of-cracks-in-concrete-beams/5948/
Cracks in concrete beams due to increase in shear stress appears near the support such as wall or column. These cracks are also called as shear crack and are inclined at 45 degrees with the horizontal. These cracks in beams can be avoided by providing additional shear reinforcements near the support where the shear stress is maximum.
https://www.houzz.com/discussions/4490011/cracked-support-beam
Mar 03, 2017 · If the crack runs horizontally half way up the beam it may not reduce the strength of the beam but for such a long span only an engineer's opinion is worth anything to the building department. Steel posts or adjustable jack posts are fine if they are rated for the load and are on a new reinforced concrete footing all of which will be specified by the engineer.
https://forum.nachi.org/t/crack-in-support-beam/16700
Apr 25, 2019 · For safety, it might be a good idea to nail a 2x board of matching depth to each side of the beam for the length of the span in which the crack exists. However, if that is done, it will not be possible to monitor the crack. Diagnosing from pictures is risky, as you might imagine, but it doesn’t look to me like a structural failure type of crack.
https://gharpedia.com/blog/types-summary-of-cracks-in-reinforced-concrete-beams/
Cracking in reinforced concrete beams subjected to bending usually starts in the tensile zone i.e. soffit of the beam. The width of flexural cracks in reinforced concrete beams for short-term may stay narrow from the surface to the steel. However, in long-term under continuous loading,...
https://inspectapedia.com/structure/Beam_Log_Checking_Cracks.php
While extreme loading can cause a wood beam (or more rarely a post) to split and would indicate a sign of impending disastrous collapse, usually the splits or cracks found in wooden posts and beams are due to shrinkage as wood dries, occur along the grain, and do not raise a structural concern.
https://www.thisoldhouse.com/discussions/topic/garage-support-beam-crack
Sep 20, 2015 · Our garage beam support is crack the entire of it's length, the beam still look straight and no bending, the length of the beam is 3 inches wide, 11 inches in height, and about 12-15 feet long.
http://snippets.com/how-concerned-should-i-be-about-a-crack-in-a-wood-beam.htm
Some wood beams are decorative only and a crack due to age is not a concern. Some wood beams are supports and the crack can weaken the structure. In this case, what you would need to do is replace the beam if possible and if not possible than you should add additional supports.
https://www.quora.com/Why-do-cracks-occur-at-45-degrees-in-a-beam
Flexure crack which is vertical if you see the elevation of the beam is more likely to happen in the mid span because the bending moment and deflection of the beam is maximum at mid span. [ This analysis is based on simply supported beam as that is generalised case]
https://answers.angieslist.com/Old-house-cracks-floor-joists-splits-main-carrying-beams-Do-I-engineer-inspector-what-q132733.aspx
Wood beams naturally develop shrinkage cracks over time, but can also crack and fail if overloaded - and even if not overloaded, over long periods like you are talking about can creep and crackk and deflect substantially so they develop unacceptable sagging, even if structurally still safe.
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