With a small reinforcement percentage, one can obtain a significantly lower capacity for this method compared to the others. The stiffness method is, for example, very dependent on the amount of reinforcement. All three methods are allowed according to the Swedish annex.Īs mentioned earlier, you can get quite different results depending on the current example. The other two methods are simplified ones, using calibrated formulas of the General method to calculate the 2nd order element. In this method, a real 2nd order analysis is made simultaneously with a non-linear calculation of how the cracking of the concrete affects the stiffness. The General Method is considered the most advanced. Which method to use is, of course, up to you the User. Which Method to follow for calculating the buckling of concrete? In this post we provide further consideration to calculating buckling of concrete in order to help explain the appropriate Method. Questions from Users continue to come though to our Support regarding which of these three methods to use and whether it is possible to combine different methods in terms of instability in different directions. These were the General Method according to EC2 5.8.6, the simplified Stiffness Method 5.8.7 and the Curvature Method 5.8.8. In a previous WIN-Statik Tips & Tricks post, we explained three methods for calculating the buckling of concrete according to EC2.
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