in what way is the true arch better than the corbel arch
Corbel arch Although an improvement in load-bearing efficiency over the post and lintel design, corbeled arches are not entirely self-supporting structures, and the corbeled arch is sometimes termed a "false arch" for this reason. Unlike "true" arches, not all of the structure's tensile stresses caused by the weight of the superstructure are transformed into compressive stresses. Corbel arches and vaults require significantly thickened walls and an abutment of other stone or fill to counteract the effects of gravity, which otherwise would tend to collapse each side of the archway inwards.[citation needed]
Gateway Arch Built as a monument to the westward expansion of the United States, the arch typifies "the pioneer spirit of the men and women who won the West, and those of a latter day to strive on other frontiers." The arch has become the iconic image of St. Louis,[59] appearing in many parts of city culture. In 1968, three years after the monument's opening, the St. Louis phone directory contained 65 corporations with "Gateway" in their title and 17 with "Arch". Arches also appeared over gas stations and drive-in restaurants.[121] In the 1970s, a local sports team adopted the name "Fighting Arches"; St. Louis Community College would later (when consolidating all athletic programs under a single banner) name its sports teams "Archers". Robert S. Chandler, an NPS superintendent, said, "Most [visitors] are awed by the size and scale of the Arch, but they don't understand what it's all about.... Too many people see it as just a symbol of the city of St. Louis."[65]