Research Article
Three-Dimensional Nonlinear Seismic Response of Shield Tunnel Spatial End Structure
Table 5
Parameters of the concrete from the plasticity test.
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fbo/fco is the ratio of biaxial to uniaxial ultimate compressive strength; Kc is the ratio of biaxial to uniaxial ultimate compressive strength; and u is the ratio of the second stress invariant on the tensile and compressive meridian planes. |