The image you've uploaded contains a description of a problem related to concrete deformation under water pressure in a dam. Here’s a summary of the key points:

• Concrete Dam under Water Pressure: The dam is under the influence of water pressure, which is causing strain at a specific point (Point A) on the dam.
• Key Parameters:
  • E (Modulus of Elasticity) = 30,000 MPa
  • f_ck (Concrete Compressive Strength) = 20 MPa
  • Angle α = 75 degrees
  • Depth h = 3 meters
  • The strain at Point A is given as -0.013%.

You are asked to:

1. Calculate the main stresses and main strains at Point A, as well as the directions of the principal stresses and strains.
2. Determine the stresses and strains relative to a new coordinate system, where the x'1 axis is parallel to the water surface, and x'2 points upwards.

To proceed with this problem, the following steps need to be taken:

1. First, calculate the strain and stress states at point A, including the effects of the modulus of elasticity and the water pressure.
2. Then, use the provided parameters to calculate the principal stresses and principal strains.
3. Finally, transform the stress and strain tensors to the new coordinate system, aligning them as described in the image.

Would you like me to help with the calculations in detail? Let me know how you'd like to proceed!