The analysis is not complete as I got below error:
***ERROR IN MATRIX DECOMPOSITION
ROW 139 HAS ZERO OR NEGATIVE TERM = -0.111716D+06
MATRIX IS NON-POSITIVE DEFINITE
OCCURS AT JOINT 6001 FOR X ROTATION
MATRIX DECOMPOSITION ERROR indicates that the structure is unstable, so you need to reevaluate the model. What you can do is check the joint/surrounding joints for abnormalities. Usually, you will find unconnected members, member releases, or joint fixities that cause instability.
During the SACS calculation process, the model stiffness matrix must be positive because the stiffness matrix needs to be inverted during the calculation process. Therefore, when an external stiffness matrix is introduced, the positive definiteness of the introduced stiffness matrix must be checked.
If an error related to the stiffness matrix is reported, you need to check the model first. Usually, you should first pay attention to the constraints of the structure, the release of the degrees of freedom at the ends of the structural elements, and the release of the degrees of freedom at the structural nodes. Check whether there are units with undefined properties in the model through the three-dimensional model, and then conduct further in-depth screening.
If the reported calculation result precision loss is less than 6, SACS can still calculate with high precision, that is, the impact on the calculation is relatively small; if the reported calculation result precision loss is greater than 6, it is recommended to check whether there are unreasonable places in the model. Common ones include too large difference in stiffness between two adjacent units, too large difference between the foundation and the superstructure, too short part of the structure (such as cone, wedge beam), etc.
It is necessary to try to avoid too large a difference in stiffness between two adjacent structures. Such a large difference may cause serious distortion in the calculation. For example, when directly connecting a rod and a plate, it is necessary to determine whether the stiffness difference is large. If so, it is recommended to model the connection in detail.