A 40-second test in Japan on the world’s largest shake table demonstrated for the first time that wood-framed mid-rise buildings can be built to withstand major earthquakes, say researchers. The simulation of a magnitude-7.5 quake on a six-story residential building caps a $1.4-million research project that is elevating performance-based seismic design of wood frames. The work is expected to result in new standards for mid-rise wood buildings, which rarely are allowed in quake zones. Photo: Neeswood and Simpson Strong-Tie World’s largest shake table helped demonstrate the viability of performance-based seismic design for wood frames. During the July 14 test, the
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.