H-beams excel in seismic zones due to their ductility and flexibility. Their ability to deform elastically during earthquakes absorbs energy, reducing structural damage. The H-shape allows controlled yielding-flanges and web bend without sudden failure, acting as "fuses" to protect critical components. Properly designed connections (e.g., bolted joints with slotted holes) allow for slight movement, preventing brittle fractures. High-strength grades with higher elongation (≥20%) are preferred, as they stretch more before breaking. In retrofitting older buildings, adding H-beam bracings reinforces lateral stability, improving earthquake resistance. Their performance is validated through seismic testing, ensuring compliance with regional codes (e.g., UBC in the U.S., JIS in Japan).