Final answer:
Steel girders commonly have two basic shapes: I-shaped and H-shaped, offering high resistance to bending strains and structural efficiency.
Step-by-step explanation:
The two basic shapes that steel girders come in are I-shaped and H-shaped. These shapes are used in construction to ensure the structural integrity and efficiency of buildings and large structures. The I-beam, also known as an H-beam or a universal beam, has a cross-section that resembles the letter "I", providing significant resistance to bending strains under load. On the other hand, C-shaped and L-shaped are generally referred to as channels and angles, respectively, and serve different functions in construction and engineering.
Steel girders come in two basic shapes: I-shaped and H-shaped. The I-shaped girder, also known as an I-beam, has a cross-section resembling the letter 'I' and is commonly used in construction to reduce bending strains. The H-shaped girder, or H-beam, has a cross-section resembling the letter 'H' and provides greater strength and load-carrying capacity compared to the I-beam.