The Seismic Performance in Diaphragm Plane of Multi-Storey Timber and Concrete Hybrid Structure

Abstract

The timber and concrete hybrid structure is constructed by concrete frame and light frame wood diaphragm and roof system, which is suitable for multi-storey buildings. In this paper, based on the deformation characteristic of wood diaphragm under lateral load, diagonal elastic springs were used to simulate the in-plane stiffness of wood diaphragm in order to simplify the structural modeling. Sap2000 was used to set up three different numerical structural models for a 6-storey hybrid building, including simplified wood diaphragm model, rigid floor model and flexible floor model. These models were analyzed with response spectrum model analysis method under frequent earthquake and time history method under rare earthquake. At last, two design plans for a 6-storety building, one with wood diaphragm, the other with concrete floor, were compared. Results showed that, the lateral forces and the displacement of the concrete frame with the wood diaphragm model lay between rigid floor model and flexible model; using wood diaphragm could maximally lower down the load of seismic and the foundation cost.