The intense sun made the beam expand, throwing the entire structure out of whack. Roller joints are used in structures that get really hot or cold. They give columns and beams the freedom to expand and contract as the temperature changes. Thanks to this roller joint, the beam can swell in the sun and slide over the column without damaging the structure. When the ground beneath a structure jerks back and forth during an earthquake, the structure is experiencing an earthquake, or seismic load.
Earthquake loads push and pull horizontally on a structure.
That was more rattling and shaking than this poor structure could handle. They resist loads that push or pull horizontally on a structure. Shear walls can handle being pushed, pulled, rattled, and shaken during an earthquake. They're a great way to strengthen a structure prone to earthquake load. When the soil beneath a structure settles unevenly, it is called settlement load.