Warning merged nodal rigid body

请教高手，我的计算出先了如下问题，请问该如何解决？
*** Warning merged nodal rigid body ID= 633 with nodal
rigid body ID= 229 due to shared common nodes.
Rigid body # 25 in order of input.
*** Warning merged nodal rigid body ID= 634 with nodal
rigid body ID= 230 due to shared common nodes.
Rigid body # 26 in order of input.
*** Warning merged nodal rigid body ID= 377 with nodal
rigid body ID= 740 due to shared common nodes.
Rigid body # 518 in order of input.
*** Warning merged nodal rigid body ID= 717 with nodal
rigid body ID= 379 due to shared common nodes.
Rigid body # 104 in order of input.
*** Warning merged nodal rigid body ID= 380 with nodal
rigid body ID= 718 due to shared common nodes.
Rigid body # 521 in order of input.
*** Warning merged nodal rigid body ID= 799 with nodal
rigid body ID= 429 due to shared common nodes.
Rigid body # 150 in order of input.
*** Warning merged nodal rigid body ID= 421 with nodal
rigid body ID= 793 due to shared common nodes.
Rigid body # 541 in order of input.
*** Warning merged nodal rigid body ID= 426 with nodal
rigid body ID= 798 due to shared common nodes.
Rigid body # 546 in order of input.
*** Warning 8 nodal rigid body merged due to shared common nodes.