Keywords: Seismic performances. Rail counterweight systems. Building elevators. Guide rail designs. Seismic code provisions. Elevator systems. Critical facilities. Hospitals. Nonstructural components.

It was a real pyramid scheme. Scientists have proposed a groundbreaking new theory on how Egypt’s Great Pyramid was built, positing that they used a pulley and counterweight system to erect it so ...

Dr. Scheuring's study suggests the Great Pyramid used pulley and counterweight systems for construction The pyramid contains 2.3 million limestone bricks weighing between 2 to 60 tons each ...