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a technical architectural diagram for window reinforcement in masonry construction, specifically designed for window openings wider than 90 cm. This type of reinforcement is standard in seismic (earthquake-prone) zones to ensure the structural integrity of a brick wall.
The image is divided into two sections: a front elevation view (top) and a 3D perspective cutaway (bottom).

1. ELEVATION VIEW (TOP SECTION)
This diagram illustrates the placement and dimensions of structural elements around a window opening.
• Lintel Band: A continuous horizontal concrete beam running across the top of the window. It must have a minimum thickness of 15 cm.
• Sill Band: A horizontal concrete beam at the base of the window opening.
• Vertical Window Reinforcement: Two vertical steel rods (rebar) placed on either side of the window.
• They are positioned exactly 30 cm away from the edge of the window opening.
• These rods tie the sill band and the lintel band together, creating a rigid frame.
• Dimensions:
• Applied to openings > 90 cm.
• The maximum height of the window opening shown is 1.2 m.

2. 3D CUTAWAY VIEW (BOTTOM SECTION)
This section provides a "behind-the-scenes" look at how the lintel/seismic band is constructed.
• Reinforcement Cage: The image shows a cage of four longitudinal steel bars tied together by square "stirrups." This provides the concrete with its tensile strength.
• Formwork: Temporary wooden bracing (labeled "FORMWORK") is shown holding the wet concrete in place during the pouring and curing process.
• Seismic Band Integration: It labels the lintel as a "Reinforced Seismic Band," indicating that this horizontal beam is intended to distribute lateral forces (like those from an earthquake) across the entire length of the wall.
• Vertical Rebar Connection: You can see the vertical reinforcement rods extending upward through the seismic band, which ensures the vertical and horizontal supports are physically locked together.

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