Fig. 12From: The Use of Advanced Optical Measurement Methods for the Mechanical Analysis of Shear Deficient Prestressed Concrete MembersExperimentally determined direction and magnitude of the principal compressive strain field \({{{\varvec{\epsilon} }_{2}}}\) of specimen B104 as a function of the surface coordinates and the applied load level (Note line where the angle \(|\theta _{\epsilon _{2}}|\) was determined in Fig. 11b indicated with a dotted line).Back to article page