tailieunhanh - Two Main Methods for Yield Line Analysis of Slabs

There is a debate on the sugar production of the classical methods of analysis are in fact different methods or different simply to develop essentially the same method. In this paper proposed two methods which, without invalidating the previous ones, actually correspond to two different ways of analyzing the yield and thus create favorable conditions for a better understanding of the general problem of the failure of the plate. These methods are almost abandoned "method at the normal time" and a "new method tilt time." In normal time "method" only bending moments are supposed to act in line with productivity | Two Main Methods for Yield Line Analysis of Slabs Valentín Quintas 1 Abstract There is a controversy about whether the classical yield lines analysis methods are in fact different methods or simply different ways to develop basically the same method. In this paper two methods are proposed that without invalidating previous ones really correspond to the two different ways of performing yield line analysis and therefore facilitate a better comprehension of the general problem of the failure of slabs. These methods are the nearly abandoned normal moment method and a new skew moment method. In normal moment method only bending moments are supposed to act at yield iines. In skew moment method twisting momentsin addition to bending moments act along yield lines. The normal moment method ss general onty if yied patterns are correct tirai is they are composed by possible yield lines. If yield lines are incorrect or not poss Sc yied hne eralysts can onty be peifomied m general by means of skew moment method. As Town m thus paper many of the e siica solutions of yiedd iíne analyrts correspond to incorrect yield patterns. This work demonstrates that Johansen s nodal lorce theorv or equiiibsiommTthod and sork method tare onty pattial apphcations df skew moment method. Thingeneralizatienofyield imeenalysiraltowldefining now euuilíb-rium conditions not included in classical yield lines theory and permits obtaining more accurate solutions. CE Database keywords Slabs Analytical techniques. Introduction Ingerslev 1923 performed for the lirss t me a ytoid ana itis O i- a simply supported rectangular slab by means of which in what follows will be referred to as the normal moment method m essence by simply assuming the equilibrium between loads and only bending moments acting alone at yield lines. This method is the natural approach to yield line analysis because as Johansen himself recognized Johansen 1962 at real yield lines only the greatest principal moment acts. However when

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