![]() Despite such savings, the overall inelastic performance of a structure is normally better if its members are dimensioned for the results of a modal response spectrum analysis, instead of the lateral force method. These effects are translated to some savings in materials. The version of the method in Eurocode 8 has been tuned to give similar results for storey shears - considered as the fundamental seismic action effects - as those from modal response spectrum analysis (which is the reference method), at least for the type of structures to which the lateral force method is considered applicable.įor the type of structures where both the lateral force method and modal response spectrum analysis are applicable, the latter gives, on average, a slightly more even distribution of peak internal forces in different critical sections, such as the two ends of the same beam or column. Owing to the familiarity and experience of structural engineers with elastic analysis for static loads (due to gravity, wind or other static actions), this method has long been - and still is - the workhorse for practical seismic design. The intent is to simulate through these forces the peak inertia loads induced by the horizontal component of the seismic action in the two directions, X or Y. ![]() ![]() In the lateral force method a linear static analysis of the structure is performed under a set of lateral forces applied separately in two orthogonal horizontal directions, X and Y. Introduction: the lateral force method versus modal response spectrum analysis
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