calculate structural strength

Teach me how to calculate structural strength and maximum load of 1. composite sandwich construction beam 2. i - beam for various material show examples with full working and explanations and formulas For the calculation use core material 0.06SG, compressive strength 0.9MPa, compressive modulus 70MPa, tensile strength 1.8MPa, tensile modulus 75MPa, shear strength 0.76MPa, shear modulus 20MPa, shear strain 20% For fiberglass use 1.8SG, tensile strength 15,000psi, tensile modulus 1.1x10^6psi, flexural strength 25,000psi, flexural modulus 1.1x10^6psi, elongation 2.0%, compressive strength 20,000psi I – beam will be fiberglass also.