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  • Posts

    • Hi colleagues!   I am a little confused with design of the shear reinforcement between web and flanges of T-beam.   As I understood, in expression vEd=deltaFd/(hf*deltaX), deltaFd is difference in longitudinal compression force due to bending moment in the beam. So, for example, in a simple supported beam maximum shear stress should be in the middle of the beam. So the shear reinforcement should be placed in the middle of the beam.   As mentioned in "Guidelines and Rules for Detailing of Reinforcement in Concrete Structures. A Compilation and Evaluation of Ambiguities in Eurocode 2" (page 139), the shear stress could be derived from design shear force vEd=VEd/(z*hf) when deltaX→0. But in such case the maximum shear stress would be on supports. So the shear reinforcement should be placed near the supports.   The question: Where the shear reinforcement between web and flanges of T-beam should be placed? And why?   Best regards
    • Hello, and welcome to the forum!   From my understanding, the bolt has to only be checked for pre-load, as shear is transferred through friction between plates themselves. After slip occurs and bolt goes into bearing only then you need to check for shear and bearing as well.   Cheers
    • Dear all,   I am checking bolted connection loaded in shear and tension ( only one bolt ) where I calculate slip resistance acc to Eq. 3.8 (EN1993-1-8).   If I pass this check do I also have to conform to Combined shear and tension equation in table 3.4 for bolt?   I suppose my question is what does that eq. in table 3.4 take into account? Is the transfer of shear in slip critical connection assured by friction and bolt does not see the shear (Tension with pre-load is enough to check) or am I wrong here and the bolt has to be checked as well (I assume that eq. in Table 3.4 does just that (Combines tension and shear in bolt))   Thank you, Jacob
    • Hello forum once again, Below I have attached procedure for selecting reference temperature for toughness selection in case of fatigue load. ************************************************************************************ Tmd = 10 deg C, Lowest air temperature Variabe load Q2 = 1000 Kg @ 90 RPM   Max applied reference stress shall be calculated for combination as per Eq. 2.1:   TEd = Reference temperature as per Eq. 2.2         = Tmd + ΔTɛ' (Considering recommended values for adjustment factors) ΔTɛ' = Adjustment for a strain rate other than the reference strain rate ɛ'0          = - [ (1440-fy)/550 ] * [ ln(ɛ'/ɛ'0)]^1.5 where, fy = yield strength      = 355 N/mm2 (for S355 grade) ɛ' = Actual strain rate     = 90 /min. (since speed of shaft is 90 RPM)     = 1.5 /sec ɛ'0 = Reference strain rate        = 4e-4 /sec. [from 2.3.1(2)] ΔTɛ' = - [ (1440-355)/550 ] * [ ln(1.5/4e-4)]^1.5          = - 46.57 deg. C Tmd = 10 deg C, Lowest air temperature   TEd = 10 - 46.57         = -36.57 deg. C ***************************************************************************************** Am I using right procedure?  If no, please let me know my mistakes. If yes, in case the rotor speed producing dynamic load rotates @ 1500 RPM i.e., strain rate of 1500/60 = 25 /sec. Adjustment for strain rate would have been, 79.73 deg. C. TEd = 10-79.73 = 69.73 deg.C It means in such case, we will not be able to select thickness from Table 2.1 and will need to use other method for toughness selection. eg. fracture mechanics Am I right?  
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