Seismic Performance Evaluation of Novel Cold-Formed Steel Framed Shear Walls Sheathed with Corrugated Steel Sheets Page: 37
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5.6 Modeling of Diaphragm
In Leng's dissertation (2015), he concluded that the stiffness of diaphragms contributes
greatly to the overall stiffness of 3D models and it determines the extent of coupling between shear
walls. Peterman (Peterman 2014) compared shake table test results to the definition of flexible
diaphragms in ASCE 7 and the design assumption of the archetype building and concluded that
considering the diaphragm as semi-rigid is most consistent with observations. From the modeling
guidelines of Leng's research. He concluded that modeling diaphragms as rigid is simpler and is a
better initial assumption. Zhang (2016) also choose rigid diaphragm for modeling the floor and
So, rigid diaphragm was chosen in this research. Rigid diaphragm was used in the model
by a built-in rigid diaphragm command. It requires to define one master node and multiply slave
nodes. The degrees of freedom of the slave nodes will be the same as the master node. The master
node was defined on the geometry center of each floor, and all the perimeter nodes on each floor
were defined as the slave nodes.
5.7 Seismic Mass and Gravity Load
For office building, total seismic mass was refer to the effective seismic mass calculated in
the Design Narrative (Madsen, Nakata, Schafer, 2011). For hotel building, the seismic mass was
refer to the ASCE 7-10. The mass on each floor was divided equally and lumped to the four corners
of the building model.
Since gravity loads has been considered in the test, which means P-delta effects were also
been considered. So, no gravity load and P-delta effects were defined in the modeling.
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Lan, Xing. Seismic Performance Evaluation of Novel Cold-Formed Steel Framed Shear Walls Sheathed with Corrugated Steel Sheets, thesis, August 2017; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc1011859/m1/45/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; .