Unusual double-helix external bracing will stabilize a 620-meter-tall tower at the center of the 20-building Yongsan International Business District, planned for a 3,000-hectare site next to the Han River in Seoul, South Korea. The conical skyscraper is among the first of the major buildings scheduled to start construction soon, now that conceptual designs for the 3.4-million-square-meter brownfield development have been completed.
Teams of local and international architects and engineers announced their concepts for each of Yongsan's planned buildings earlier this month, marking the start of the project's design development phase. International designers will continue to lead work on the conical structure, called the Landmark Tower, and two other buildings. However, local firms will drive the rest of the work, with the international collaborators providing advice where needed. The first buildings could be ready for use in about four years, according to the current schedule.
Because it can moderate the damaging effects of earthquakes, base-isolation is a technique used primarily in seismically active regions. ENR takes a look at some of the largest applications of base-isolation technologies in the world.