The invention relates to the technical field of earthquake damage evaluation, in particular to a method for evaluating the overall earthquake damage level of a
reinforced concrete frame
structure based on an equivalent single-degree-of-freedom
system. The method is used for quickly and accurately evaluating the overall earthquake damage level of the structure after an earthquake by using strong
ground motion data acquired by the structure. The method includes the steps that a multi-degree-of-freedom
system structure is equivalent to the single-degree-of-freedom
system structure, and namely the multi-degree-of-freedom system with N
layers is equivalent to the single-degree-of-freedom system, wherein the
mass M[e] of the single-degree-of-freedom system is equal to the total
mass of the multi-degree-of-freedom system; the maximum acceleration response of the equivalent single-degree-of-freedom system under the same earthquake
ground motion effect is worked out; the
ductility coefficient of the equivalent single-degree-of-freedom system under the same earthquake
ground motion effect is worked out; damage index calculation is carried out; structural damage evaluation is carried out. By means of the method, the defects that large errors can be caused in a damage evaluation method based on
modal parameters and time and labor are consumed and results are prone to
divergence in a damage evaluation method based on physical parameters are overcome, and the overall earthquake damage level of the structure can be easily, quickly and effectively evaluated in a quantitative mode.