What is design horizontal seismic coefficient?

The design horizontal seismic coefficient is a crucial parameter used in structural engineering to estimate the seismic forces that a building or structure may experience during an earthquake. It is a function of factors such as the seismic zone, building importance, and site conditions, often defined by building codes. This coefficient helps engineers determine the lateral forces that need to be resisted by the structure, ensuring it can withstand potential seismic events. In essence, it facilitates the design of safer buildings in earthquake-prone areas.