Appropriateness of shear-building models for ASCE SHM Benchmark structure

摘要

The IASC-ASCE Structural Health Monitoring Task Group had developed a series of benchmark problems,and participants of the benchmark study were charged with using a 12-DOF(degrees-of-freedom)shear building as their identification model.The present article addresses the modeling and parameter errors of using this particular model for the purpose of damage detection,while the measurements of damaged structures are synthesized from a full-order finite-element model.First,a model conversion technique is utilized to calibrate the mass and stiffness matrices of the baseline identification model,and a physically meaningful 12-DOF shear building model that preserves the first three modes of the full-order model is obtained.Sequentially,this calibrated model is employed as the baseline model while performing the damage detection under various damage scenarios.Both the model conversion technique and the damage detection algorithm in this study follow the framework of the cross-model cross-mode(CMCM)method,which was developed originally for model updating.Numerical results indicate that a 12-DOF shear building model is an over-simplified identification model,through which only idealized damage situations for the benchmark structure can be detected.