The above may not be the case. I failed to find the node number and element number to define the zerolength element in the s2k file. And when I import that s2k file into SAP2000, there is no two joints sharing the same coordinates. The mode shapes from SAP2000 are almost same as those from OSN,and the first period is 0.14 lower than OSN. Could you tell how the zero length element is defined via s2k file?
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