Cross Modal Strain Energy Method for Estimation of Semi-Rigid Joints
While rigid or pinned assumptions are adopted for steel frames in traditional modeling via finite element method, the actual behavior of the connections is usually neither. Semi-rigid joints enable connections to be modeled as partially restrained, which improves the quality of the model. To identify the connection stiffness and update the FE model, a newly-developed cross modal strain energy (CMSE) method is extended to incorporate the connection stiffness estimation. To illustrate the capability of the proposed parameter estimation and model updating algorithm, a four-story frame structure is demonstrated in the numerical studies. Several cases including Semi-rigid joint(s) on single connection and on multi-connections, are investigated. Numerical results indicate that an excellent updating is achievable and the connection stiffness can be estimated by CMSE method.
Chaohe Chen, Yong Huang and Guangfan Li
S. Q. Wang et al., "Cross Modal Strain Energy Method for Estimation of Semi-Rigid Joints", Advanced Materials Research, Vols. 243-249, pp. 5386-5393, 2011