![]() ![]() Lastly we have to see where FAGUS gives us the mechanical characteristics of the homogenised cross section. ![]() Taking into account that fct,m is given (it depends on the concrete, the cross section is made with): Yh = distance from the neutral axis of the homogenised cross section to the most stressed fibre. ![]() Ih = inertia of the homogenised cross section. ![]() The cracking moment of a concrete cross section is defined as:įct,m = average tensile strength of concrete. The obtention of Mf and If is not straightforward in FAGUS but it is fairly simple to calculate both parameters from values that can be obtained immediately from this program. If = Icrk = Inertia of the cracked section Ma = Maximum moment applied to the characteristic combination Mf = Mcrk = Nominal cracking moment of the cross section In the calculation of the equivalent inertia is where the cracking moment and the cracked inertia come are needed, being part of the formula below (art. The calculation of the natural frequency is carried out by the following formula: The value of the instantaneous deflection that is used, for example, for the calculation of the natural frequency of beams that, takes part at the same time in the calculation of the impact coefficient according to the IAPF-07. The obtention of these results is necessary for the calculation of the instantaneous deflections on cracked elements with constant cross section: In many occasion we have received queries on the topic of obtaining the cracking moment and the cracked inertia of a concrete cross section in FAGUS. ![]()
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