Deflection Limits | Eng-Tips Dougantholz - It seems that deflection limits are up to the engineer who is designing, and not to exceed the limits set forth in code (l 240, l 360, l 600, etc ) Lets just say an l 360 delf limit for a particular beam comes out to be 1 45" I personally try to keep deflection for any beam under 1" So I would use a stiffer beam, but I could go lighter I think it comes down to what you feel
Allowable deflection of beams | Eng-Tips Deflection in beam design implies relatively slow (nearly static) deflection of a beam A beam subjected to vibrations means that you need to be looking into a dynamic or vibration analysis That will tell you the vibration frequency, amplitude, etc and compare that to the allowable limits of the equipment
Deflection check | Eng-Tips The proper Global deflection limit to use also has to do with what is on the roof as a roofing material - this looks like a rafter beam situation is why I mention it If the roof is tile, deflection is very readable from the ground, less so with composition, but still readable
Deflection Formula | Page 3 | Eng-Tips Here is the complete solution for the given beam deflection question, solved using the double integration method The attached pages show the full derivation, step-by-step explanation, and the final expressions for deflection and maximum deflection for a simply supported beam under a uniformly distributed load (UDL) Click to expand
Allowable deflections for Residential Floor Beams | Eng-Tips I have been pondering allowable deflection limits for our residential design standards for high-end residential *FLOORS BEAMS*(wood framed with LVL, glu-lam, and steel beams) I am trying to develop a list of criteria for younger engineers, and I would appreciate some input from some of y'all
Deflection | Eng-Tips Deflection criteria are put in place for a variety of reasons, including aesthetics, limiting cracks, mitigation of creep, and to force sections to be more resistant to "dynamic" deflection such as floor "sponginess"
Laterally Loaded Pile Criteria | Eng-Tips The allowable deflection can be different for diff structures as already pointed out by the earlier replies My own experience shows that for piles with a long unsupported length, such as in jetties or bridges, a deflection of the top of pile up to 80 to 150 mm is often tolerated
Compound deflections for steel beams girders | Eng-Tips Do the deflection criteria for the beam (L 240 for total load or 1" is what I'm using) depend on the deflections of the supporting girders? For example, if the midspan deflection of my beam is 0 5" but the midspan deflection of the girders is also 0 5", do I not have any wiggle room with the beam since its compound deflection is 1"?
Brick Deflection Limits | Eng-Tips I am aware of the commonly accepted limits of 0 30" or L 600 for brick lintels, whichever is less For very long spans the 0 30 requirement can be unreasonable For example, a 40 ft span truss that deflects 0 50 inches (L 960) has less angular rotation than a 15 ft beam that deflects 0 30
Simple Deflection Question | Eng-Tips The code deflection limit charts for Floor Members simply states: Live load = l 360 Nothing for Wind D+L = l 240 So am I only checking the Live Load deflection and the Load combination (D+L) deflection? Does my Load combination of D+0 75L+0 75(0 6W)+0 75Lr not need to meet l 240? Or is