As the world becomes increasingly populated and more developed, the potential for damaging earthquakes increases. To protect people and property from the devastating effects of earthquakes, building codes have been developed that specify the design requirements for buildings in earthquake-prone areas. One of the most important aspects that is considered in the development of building codes is the effect of seismic loading on buildings. Seismic loading is the term used to describe the forces that a building experiences as a result of the ground movement caused by an earthquake. Building codes specify the level of seismic loading that a building must be able to withstand.

There are a number of ways in which a building can be designed to resist seismic loading. One approach is a strength-based design where the building is rigid enough so that the entire building moves with the ground. Another approach is for the structure to be flexible during an earthquake. This allows the base of the building to move with the ground while the upper components bend and flex by using ductile materials like steel, this approach absorbs the energy from the earthquake while taking some damage, but prevents the building from total collapse. Isolating the building from the ground with the use of bearings or rollers is another approach.

Building codes are only as good as the level of enforcement to which they are held. Most construction projects go through a review process with local building departments to ensure construction meets the standards set forth by the codes. If amnesty to the building codes is granted for a fine, allowing construction of structures below minimum code requirements, then the structure may be defined as legal but not necessarily safe by modern construction standards. There should also be no conflict of interest between the inspection team and the construction companies being inspected to ensure proper enforcement of building codes. Here at Anchor Engineering, we will always place public welfare above all other considerations. If you have any concerns about your structure being impacted by a seismic event, contact your local design professional for guidance on how to best prepare for when the ground starts to quake beneath your feet.

Anchor Engineering Local Project: Large steel moment frame to resist lateral forces