我模拟了单层单品框架的低周反复荷载试验，很难收敛，之前也听说过，混凝土很难收敛，但是我感觉我的模型有问题，附上error文件夹里的内容，希望各位提点建议！谢谢


*** WARNING *** CP = 155.453 TIME= 19:21:27
Specified forces from the previous F command were applied only to
defined and selected nodes.

*** WARNING *** CP = 155.531 TIME= 19:21:27
Specified forces from the previous F command were applied only to
defined and selected nodes.

*** WARNING *** CP = 155.594 TIME= 19:21:27
Node 1012 on element 1 is unselected.

*** WARNING *** CP = 155.594 TIME= 19:21:27
Node 1138 on element 1 is unselected.

*** WARNING *** CP = 155.594 TIME= 19:21:27
Node 1124 on element 1 is unselected.

*** WARNING *** CP = 155.594 TIME= 19:21:27
Node 1095 on element 1 is unselected.

*** WARNING *** CP = 155.594 TIME= 19:21:27
Node 1042 on element 1 is unselected.

*** WARNING *** SUPPRESSED MESSAGE CP = 155.594 TIME= 19:21:28
Node 2285 on element 1 is unselected.

*** WARNING *** SUPPRESSED MESSAGE CP = 155.594 TIME= 19:21:28
Node 2345 on element 1 is unselected.

*** WARNING *** SUPPRESSED MESSAGE CP = 155.594 TIME= 19:21:28
Node 2355 on element 1 is unselected.

*** WARNING *** SUPPRESSED MESSAGE CP = 155.594 TIME= 19:21:28
Node 1042 on element 2 is unselected.

*** WARNING *** SUPPRESSED MESSAGE CP = 155.594 TIME= 19:21:28
Node 2285 on element 2 is unselected.

*** WARNING *** SUPPRESSED MESSAGE CP = 155.594 TIME= 19:21:28
Node 2345 on element 2 is unselected.

*** WARNING *** SUPPRESSED MESSAGE CP = 155.594 TIME= 19:21:28
Node 2355 on element 2 is unselected.

*** WARNING *** SUPPRESSED MESSAGE CP = 155.594 TIME= 19:21:28
Node 1041 on element 2 is unselected.

*** WARNING *** SUPPRESSED MESSAGE CP = 155.594 TIME= 19:21:28
Node 2286 on element 2 is unselected.

*** WARNING *** SUPPRESSED MESSAGE CP = 155.594 TIME= 19:21:28
Node 2340 on element 2 is unselected.

*** WARNING *** SUPPRESSED MESSAGE CP = 155.594 TIME= 19:21:28
Node 2356 on element 2 is unselected.

*** WARNING *** SUPPRESSED MESSAGE CP = 155.594 TIME= 19:21:28
Node 1041 on element 3 is unselected.

*** WARNING *** SUPPRESSED MESSAGE CP = 155.594 TIME= 19:21:28
Node 2286 on element 3 is unselected.

*** WARNING *** SUPPRESSED MESSAGE CP = 155.594 TIME= 19:21:28
Node 2340 on element 3 is unselected.