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Engineering : Heritage, Historical Place and Nowaday Objects

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First World Hydro Engineer

Emperor Yu from China, was the first Hydro engineer in the world. He construct hydrologism of Yellow River (Huang He)

The history of China reaches back over 5,000 years. In that time, China has created a culture rich in philosophy and the arts. China has seen the invention of amazing products and technologies such as silk, paper, gunpowder, and movable-type printing.

Chicago Board Trading Building
The Chicago Board of Trade Building is a skyscraper located in Chicago, Illinois. It stands at 141 W. Jackson Boulevard at the foot of the LaSalle Street canyon, in the Loop community area in Cook County, Illinois, United States. First designated a Chicago Landmark on May 4, 1977, the building was listed as a National Historic Landmark on June 2, 1978. It was added to the National Register of Historic Places on June 16, 1978. Originally built for the Chicago Board of Trade (CBOT), it is now the primary trading venue for the CME Group, formed in 2007 by the merger of the CBOT and the Chicago Mercantile Exchange.
The 141 W. Jackson address hosted the former tallest building in Chicago designed by William W. Boyington before the current Holabird & Root structure, which held the same title for over 35 years. The current structure is known for its art deco architecture, sculptures and large-scale stone carving, as well as large trading floors. A three-story art deco statue of Ceres, goddess of grain, caps the building. The building is a popular sightseeing attraction and location for shooting movies, and its owners and management have won awards for efforts to preserve the building and for office management.

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  • Sampoong Building Collapse Disaster
    The Sampoong Group began construction of the Sampoong Department Store in 1987 over a tract of land previously used as a landfill. Originally designed as an office building with four floors, Lee Joon, the future chairman of the building, redesigned the building as a large department store later on during its construction. This involved cutting away a number of support columns in order to permit the installation of escalators. When the initial contractors refused to carry out these changes, Lee fired them and hired his own building company to construct the building.

    The building was completed in late 1989, and the Sampoong Department Store opened to the public on July 7, 1990, attracting an estimated 40,000 people per day during the building's five years in service. The store consisted of a north wing and south wing, connected by an atrium.
    Later on, a fifth floor was added to the four-floor building, which was first planned to be a skating rink; the skating rink was added due to regulations that stopped the whole building from being used as a department store. Lee changed the original plan for the fifth floor to include eight restaurants. When a construction company tasked to complete the extension advised that the structure would not support another floor, they were fired, before another company finished the job. The restaurant floor also had a heated concrete base with hot water pipes going through it, as patrons sit on the ground of traditional Korean restaurants, which added a large extra load as a result of increasing the thickness of the concrete slab. In addition, the building's air conditioning unit was now installed on the roof, creating a load of four times the design limit.
    Collapse
    In April, 1995, cracks began to appear in the ceiling of the south wing's fifth floor. During this period, the only response carried out by Lee and his management involved moving merchandise and stores from the top floor to the basement. The store management failed to shut the building down or issue formal evacuation orders, as the number of customers in the building was unusually high, and the store was not intending to lose potential revenue for that day. However, the executives themselves had left the premises as a precaution.
    On the morning of June 29, the number of cracks in the area increased dramatically, prompting managers to close the top floor and shut the air conditioning off. Civil engineering experts were also invited to inspect the structure, with a cursory check revealing that the building was at risk of collapse; The National Geographic documentary series Seconds From Disaster indicates that the facility's manager was examining the slab in one of the restaurants on the fifth floor, eight hours before the collapse, when, unknowingly, vibrations from air conditioning were radiating through the cracks in the concrete columns and the floor opened up.
    Five hours before the collapse, the first of several loud bangs were emitted from the top floors, as the vibrations in the air conditioning caused the cracks in the slabs to widen further. Amid customer reports of the vibrations, the air conditioning was turned off, but the cracks in the floors had already widened to 10cm.

    At about 5:00 p.m. Korea Standard Time (UTC+9:00), the fourth floor ceiling began to sink, resulting in store workers blocking customer access to the fourth floor. According to Seconds From Disaster, the store was packed with shoppers 52 minutes before the collapse, but the owner did not close the store or carry out repairs at the time. When the building started to produce cracking sounds at about 5:50 p.m., workers began to sound alarm bells and evacuate customers.
    Around 6:05 p.m., the roof gave way, and the air conditioning unit crashed through into the already-overloaded fifth floor (Seconds From Disaster indicates that the fifth floor slab and roof were the first to collapse, causing the air conditioning units to fall through the structure). The main columns, weakened to allow the insertion of the escalators, collapsed in turn, and the building's south wing pancaked into the basement. Within 20 seconds, all of the building's columns gave way, trapping more than 1,500 people and killing 500.

    The disaster resulted in about ₩270 billion (approximately US$216 million) worth of property damage.

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