Strength analysis in regulatory design documents and computational software
Keywords:load-bearing capacity, building codes, computer analysis
Modern building design standards have a long history. During this time, they have undergone a number of changes, but some of their provisions and recommendations, once proclaimed, remain unchanged. And although they do not meet the modern possibilities of computational analysis, but continue to exist due to the established tradition. In this paper, attention is paid to only some of the mentioned conflicts, which are related to the software implementation of regulatory requirements. The first of them is connected with two different parts in the process of design justification: calculation of the stress-strain state and verification of the accepted cross sections. It is noted that when the calculation model adopted for computer analysis of the structure does not correspond to the model that was meant when compiling the regulatory document, there may be contradictions or inaccuracies that cannot be resolved without decoding the approach adopted in the standards. Unfortunately, such a decoding is not provided in our rationing system. Another group of conflicts is connected with conducting the structural analysis taking into account geometrical and physical nonlinearity declared by standards. The matter is there are some problems that cannot be solved when using nonlinear calculation, for instance, dynamic analysis using eigenmode decomposition with the subsequent summation of modal reactions. The problem of choosing an unfavorable combination of loads is also in this list. In the final part of the article some proposals are formulated. This proposals aimed at eliminating contradictions between the desire to develop simple and understandable design rules and the ability of modern computer to solve problems without the use of dubious simplifications.
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