Three Streets Historic Holy City Slimming Steel Bar is the fourth phase of housing. Because a large building in Nanyang High-tech Zone in Henan Province is called Sanjieshi Holy City, the event of slimming steel bars has always been the focus of interviews, and this is the fourth phase of housing. "Slimming steel bar" refers to stretching ordinary steel bars before they are used in building construction, in order to reduce the construction cost. Some experts pointed out that the original ductility was destroyed after the steel bar was drawn and stretched, which broke through the tensile safety limit. Buildings are prone to collapse in the event of an earthquake. In addition to the decline in earthquake resistance, the damage caused by the "slimming" of steel bars will also reduce the bearing capacity of the house. The higher the building, the more serious the damage.