I think you'll struggle to find drawings about tension per se. When the boles of trees are converted by being sawn "through and through", the cheapest and fastest way to mill construction timbers, you'll get quite a few boards which can be prone to cupping across the width. In construction timbers this normally isn't significant (see below). Where a tree has been grown in a place such that it has to bend one way or twist to reach the light this can cause crowning or winding along the length, particularly when the boards are dried. The worst examples are normally pulled by the timber processor, so you don't see them, but poor storage (e.g. lack of sticking between boards, boards not stored off ground or left in sheeted) can exacerbate problems in new timber
What the trade normally do is to order over volume by 5% or so. The carpenters then sight down each board as it is lifted off the stack to check for cup, wind and crowning (bowing along the length). Badly affected boards are rejected for use as longer components, but they can still be utilised for shorter pieces, solid strutting or blocking (or in walls, noggins/dwangs) where he much shorter lengths make cupping or warping less of an issue, as well as being ripped down for bearers, etc where being thinner wind and crowning can normally be taken out by nailing or screwing down. Joists and rafters/spars which are bowed or crowned along the length are installed crown side upper most as subsequent loading from sub-flooring, sarking boards or roofing materials will naturally flatten any crowning out. Only in the worst cases will a jack plane ever be taken to framing timbers to sort out discrepancies
TBH your best bet is probably to replace that piece. In general no amount of drilling and relieving will do much good and worse risks weakening the timber