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The analysis of structures that resist wind loads could it be similar to earthquakes loads, because both are mainly lateral loads. However, deep differences are present in their design. Design for combined Gravity and wind load is based in verifies that loads are less than capacity of structural elements, trying to keep an elastic behavior . However, design of structures for combined gravity and earthquake is based in deformations and damage rather than only strength. Inelastic behavior is expected, and the design allows reach less strength than an elastic analysis. Moreover, design lead to ductile structures and a design by displacements instead of strength. Ductility can be defined as the ratio between d max and the drift expected. The ductility will keep constant in an Elastic behavior. Because the inelastic behavior is complex, then it is assumed that ductility of structures are defined always in the elastic range. Due to the ground accelerations, then inertia forces