3.1 Web Shear Element
As stated before, the web shear element can be treated as a
membrane element subjected to pure shear force (1 -
a)V. After diagonal cracking, the concrete is separated by
diagonal cracks into a series of concrete struts as shown in
Fig. 6a. The shear force produces a set of bi-axial stress field
constituted with the compressive principal stress f2 and the
tensile principal stress f1 with inclination angle of h as shown
in Fig. 6. The reinforcing bars are assumed to be a link
member transmitting axial force only. The behavior of such a
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