驹 白 | Shanghai Jiaotong University (original) (raw)
驹 白
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Hong Kong Polytechnic University
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Dynamic behavior is one of the most important design considerations for high-rise structures; nat... more Dynamic behavior is one of the most important design considerations for high-rise structures; natural frequencies and corresponding mode shapes are basic data for seismic and wind response analyses. The final results of the analysis and design depend very much on the quality of the three-dimensional (3-D) finite element model developed. Comparison of natural modes of the mathematical analysis with those of field measurements is the most widely used approach to assess the credibility of the mathematical model. Finite element model updating of high-rise structures, a very time consuming procedure to achieve the credible model, has rarely been studied before. Different from the most popular model updating approaches which are based on sensitivity analysis techniques, this study presents an application of finite element model updating of high-rise structures with a computer aided model updating system (CAMUS). After investigating knowledge and experiences of model updating techniques and finite element modeling of high-rise structures, a knowledge-based system was developed to implement finite element model updating of high-rise structures. Based on the correlation analysis results of natural frequency that are stored in the knowledge base, the system searches the most likely error in the model over the knowledge base of possible problems and guides the user to update the model. The performance of the algorithm was demonstrated with an application of finite element model updating of a 66-storey frame-core wall office tower.
Using the concept of lumped masses and rigid #oor slabs, several mathematical models were built u... more Using the concept of lumped masses and rigid #oor slabs, several mathematical models were built using a popular PC-based "nite element program to model a tall building with a frame-core wall structural system. These models were analysed to obtain the "rst nine mode shapes and their natural frequencies which were compared with those from "eld measurements, using numerical correlation indicators. The comparison shows several factors that can have a signi"cant e!ect on the analysis results. Firstly, outriggers connecting the outer framed tube system to the inner core walled tube system have a signi"cant e!ect on fundamental translational mode behaviour. Secondly, detailed modelling of the core considering major and minor openings as well as internal thin walls has the strongest in#uence on torsional behaviour, whose measurements were shown to be an important aspect of the dynamic behaviour for the structure studied. Fine tuning of an analytical model requires not just considering variation in values of structural parameters but also attention to "ne detail.
Dynamic behavior is one of the most important design considerations for high-rise structures; nat... more Dynamic behavior is one of the most important design considerations for high-rise structures; natural frequencies and corresponding mode shapes are basic data for seismic and wind response analyses. The final results of the analysis and design depend very much on the quality of the three-dimensional (3-D) finite element model developed. Comparison of natural modes of the mathematical analysis with those of field measurements is the most widely used approach to assess the credibility of the mathematical model. Finite element model updating of high-rise structures, a very time consuming procedure to achieve the credible model, has rarely been studied before. Different from the most popular model updating approaches which are based on sensitivity analysis techniques, this study presents an application of finite element model updating of high-rise structures with a computer aided model updating system (CAMUS). After investigating knowledge and experiences of model updating techniques and finite element modeling of high-rise structures, a knowledge-based system was developed to implement finite element model updating of high-rise structures. Based on the correlation analysis results of natural frequency that are stored in the knowledge base, the system searches the most likely error in the model over the knowledge base of possible problems and guides the user to update the model. The performance of the algorithm was demonstrated with an application of finite element model updating of a 66-storey frame-core wall office tower.
Using the concept of lumped masses and rigid #oor slabs, several mathematical models were built u... more Using the concept of lumped masses and rigid #oor slabs, several mathematical models were built using a popular PC-based "nite element program to model a tall building with a frame-core wall structural system. These models were analysed to obtain the "rst nine mode shapes and their natural frequencies which were compared with those from "eld measurements, using numerical correlation indicators. The comparison shows several factors that can have a signi"cant e!ect on the analysis results. Firstly, outriggers connecting the outer framed tube system to the inner core walled tube system have a signi"cant e!ect on fundamental translational mode behaviour. Secondly, detailed modelling of the core considering major and minor openings as well as internal thin walls has the strongest in#uence on torsional behaviour, whose measurements were shown to be an important aspect of the dynamic behaviour for the structure studied. Fine tuning of an analytical model requires not just considering variation in values of structural parameters but also attention to "ne detail.