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A platform for research: civil engineering, architecture and urbanism
Fragility analysis of a mass-timber frame structure with ring-doweled moment-resisting connections
© WCTE 2018 Committee. The nonlinear behaviour of connections between structural elements is critical to the performance of mass-timber structures under seismic loads. However, limited work has been developed in nonlinear modelling and fragility assessment of mass-timber structures. To improve the accuracy of this approach, in particular when considering structures with ring-doweled moment-resisting connections, a nonlinear modelling approach and fragility assessment are proposed and a prototype example of a three-story building is analysed herein as a case study. For the case study, connections and members were designed following the prescriptions in Eurocode 5 and Eurocode 8, considering a high ductility structure. The mechanical properties of the structure are modelled as random variables to evaluate the impact of uncertainty on the prediction of the structural performance, in particular, on the probability of occurrence of ductile and brittle failure modes. The structure is studied under both nonlinear static analysis and multi-record incremental dynamic analysis. From these, fragility curves for different damage levels are computed and a q-factor is proposed. Results indicate that the requirements of Eurocode 5 and Eurocode 8 are sufficient to guarantee adequate performance for this type of structure, albeit these may be overconservative. Moreover, it is shown that uncertainties in material properties have a significant impact on the collapse capacity of these structures. ; This work had financial support of the Portuguese Science Foundation (FCT), through PhD grant PD/BD/113679/2015 included in InfraRisk-PhD program. The results regarding the numerical model for the connections were developed during a Short-term Scientific Mission (STSM) within scope of COST Action FP1101: Assessment, Reinforcement and Monitoring of Timber Structures. Thus, the insightful discussions with Professor Roberto Tomasi and Doctor Andrea Polastri are gratefully acknowledged. The first author would also like to acknowledge the support of Oregon State University during the period in which he was a visiting Ph.D. student, at this institution
Fragility analysis of a mass-timber frame structure with ring-doweled moment-resisting connections
© WCTE 2018 Committee. The nonlinear behaviour of connections between structural elements is critical to the performance of mass-timber structures under seismic loads. However, limited work has been developed in nonlinear modelling and fragility assessment of mass-timber structures. To improve the accuracy of this approach, in particular when considering structures with ring-doweled moment-resisting connections, a nonlinear modelling approach and fragility assessment are proposed and a prototype example of a three-story building is analysed herein as a case study. For the case study, connections and members were designed following the prescriptions in Eurocode 5 and Eurocode 8, considering a high ductility structure. The mechanical properties of the structure are modelled as random variables to evaluate the impact of uncertainty on the prediction of the structural performance, in particular, on the probability of occurrence of ductile and brittle failure modes. The structure is studied under both nonlinear static analysis and multi-record incremental dynamic analysis. From these, fragility curves for different damage levels are computed and a q-factor is proposed. Results indicate that the requirements of Eurocode 5 and Eurocode 8 are sufficient to guarantee adequate performance for this type of structure, albeit these may be overconservative. Moreover, it is shown that uncertainties in material properties have a significant impact on the collapse capacity of these structures. ; This work had financial support of the Portuguese Science Foundation (FCT), through PhD grant PD/BD/113679/2015 included in InfraRisk-PhD program. The results regarding the numerical model for the connections were developed during a Short-term Scientific Mission (STSM) within scope of COST Action FP1101: Assessment, Reinforcement and Monitoring of Timber Structures. Thus, the insightful discussions with Professor Roberto Tomasi and Doctor Andrea Polastri are gratefully acknowledged. The first author would also like to acknowledge the support of Oregon State University during the period in which he was a visiting Ph.D. student, at this institution
Fragility analysis of a mass-timber frame structure with ring-doweled moment-resisting connections
Rodrigues, Leonardo (author) / Neves, Luís Armando Canhoto (author) / Barbosa, Andre R. (author) / Branco, Jorge M. (author)
2018-01-01
Conference paper
Electronic Resource
English
DDC:
690
Seismic assessment of a heavy-timber frame structure with ring-doweled moment-resisting connections
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