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Base Isolation
Seismic base isolation, also known as base isolation, or base isolation system, is one of the most popular means of protecting a structure against earthquake forces. It is a collection of structural elements which should substantially Coupling (physics), decouple a superstructure from its Substructure (engineering), substructure that is in turn resting on the shaking ground, thus protecting a building or non-building structure's integrity. Base isolation is one of the most powerful tools of earthquake engineering pertaining to the passive structural vibration control technologies. The isolation can be obtained by the use of various techniques like rubber bearings, friction bearings, ball bearings, spring systems and other means. It is meant to enable a building or non-building structure to survive a potentially devastating seismic impact (mechanics), impact through a proper initial design or subsequent modifications. In some cases, application of base isolation can raise both ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pasadena City Hall
Pasadena City Hall is the historic city hall of Pasadena, California, United States. Completed in 1927, it combines elements of both Mediterranean Revival and Spanish Colonial Revival architecture, and is a significant architectural example of the City Beautiful movement of the 1920s. History In 1923, the people of Pasadena approved a bond measure issuing $3.5 million towards the development of a civic center. City Hall was to be the central element of this center. The San Francisco architecture firm of Bakewell and Brown designed City Hall, which has elements of both Mediterranean Revival and Spanish Colonial Revival style architecture. Completed on December 27, 1927 at a cost of $1.3 million, it measures by and rises 6 stories. There are over 235 rooms and passageways that cover over . The defining dome, located above the west entrance, is tall and in diameter. On July 28, 1980 the Civic Center District, including Pasadena City Hall, was listed on the National Regi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Linear-motion Bearing
A linear-motion bearing or linear slide is a bearing designed to provide free motion in one direction. There are many different types of linear motion bearings. Motorized linear slides such as machine slides, X-Y tables, roller tables and some dovetail slides are bearings moved by drive mechanisms. Not all linear slides are motorized, and non-motorized dovetail slides, ball bearing slides and roller slides provide low-friction linear movement for equipment powered by inertia or by hand. All linear slides provide linear motion based on bearings, whether they are ball bearings, dovetail bearings, linear roller bearings, magnetic or fluid bearings. X-Y tables, linear stages, machine slides and other advanced slides use linear motion bearings to provide movement along both X and Y multiple axis. Rolling-element bearing A rolling-element bearing is generally composed of a sleeve-like outer ring and several rows of balls retained by cages. The cages were originally machined fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earthquake Protector At The Field Museum
An earthquakealso called a quake, tremor, or tembloris the shaking of the Earth's surface resulting from a sudden release of energy in the lithosphere that creates seismic waves. Earthquakes can range in intensity, from those so weak they cannot be felt, to those violent enough to propel objects and people into the air, damage critical infrastructure, and wreak destruction across entire cities. The seismic activity of an area is the frequency, type, and size of earthquakes experienced over a particular time. The seismicity at a particular location in the Earth is the average rate of seismic energy release per unit volume. In its most general sense, the word ''earthquake'' is used to describe any seismic event that generates seismic waves. Earthquakes can occur naturally or be induced by human activities, such as mining, fracking, and nuclear weapons testing. The initial point of rupture is called the hypocenter or focus, while the ground level directly above it is the epicen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ueno Park
is a spacious public park in the Ueno, Tokyo, Ueno district of Taitō, Tokyo, Japan. The park was established in 1873 on lands formerly belonging to the Buddhist temples in Japan, temple of Kan'ei-ji. Amongst the country's first public parks, it was founded following the Park#History, Western example as part of the borrowing and assimilation of international practices that characterizes the early Meiji period. The home of a number of major museums, Ueno Park is also celebrated in spring for its cherry blossoms and ''hanami''. In recent times the park and its attractions have drawn over ten million visitors a year, making it Japan's most popular city park. History Ueno Park occupies land once belonging to Kan'ei-ji, founded in 1625 in the "Oni (folklore)#Demon Gate, demon gate", the Feng shui, unlucky direction to the northeast of Edo Castle. Most of the temple buildings were destroyed in the Battle of Ueno in 1868 during the Boshin War, when the forces of the Tokugawa shogunate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tokyo
Tokyo, officially the Tokyo Metropolis, is the capital of Japan, capital and List of cities in Japan, most populous city in Japan. With a population of over 14 million in the city proper in 2023, it is List of largest cities, one of the most populous urban areas in the world. The Greater Tokyo Area, which includes Tokyo and parts of six neighboring Prefectures of Japan, prefectures, is the most populous metropolitan area in the world, with 41 million residents . Lying at the head of Tokyo Bay, Tokyo is part of the Kantō region, on the central coast of Honshu, Japan's largest island. It is Japan's economic center and the seat of the Government of Japan, Japanese government and the Emperor of Japan. The Tokyo Metropolitan Government administers Tokyo's central Special wards of Tokyo, 23 special wards, which formerly made up Tokyo City; various commuter towns and suburbs in Western Tokyo, its western area; and two outlying island chains, the Tokyo Islands. Although most of the w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Museum Of Western Art
The is the premier public art gallery in Japan specializing in art from the Western tradition. The museum is in the Ueno Park in Taitō, central Tokyo. It received 1,162,345 visitors in 2016. History The NMWA was established on June 10, 1959. The museum developed around the core art collection of Kōjirō Matsukata (1865–1950), whose thinking is mirrored in the museum he anticipated. Matsukata's acquisition strategies were designed to create the nucleus of what he hoped would become an evolving national museum specializing in Western art. The museum exhibits works from the Renaissance to the early 20th century, many having been acquired since the museum's opening. The museum's purpose is to provide the public with opportunities to appreciate Western art. Since its opening, the museum, as Japan's only national institution devoted to Western art, has been involved in exhibitions, art work and document acquisition, research, restoration and conservation, education and the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gates Of Hell
''The Gates of Hell'' () is a monumental bronze sculptural group work by French artist Auguste Rodin that depicts a scene from the '' Inferno'', the first section of Dante Alighieri's ''Divine Comedy''. It stands at 6 metres high, 4 metres wide and 1 metre deep () and contains 180 figures. Several casts of the work were made, which are now in various locations around the world. Rodin's original plaster model is in the Musée D’Orsay, Paris. The figures range from high up to more than one metre (3 ft). Several of the figures were also cast as independent free-standing statues. History The sculpture was commissioned by the Directorate of Fine Arts in 1880. Rodin worked on and off on this project for thirty-seven years, continuously adding, removing, or altering over two hundred human figures on the doors, until his death in 1917. The Directorate asked for an inviting entrance to a planned Decorative Arts Museum with the theme being left to Rodin's se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Auguste Rodin
François Auguste René Rodin (; ; 12 November 184017 November 1917) was a French sculptor generally considered the founder of modern sculpture. He was schooled traditionally and took a craftsman-like approach to his work. Rodin possessed a unique ability to model a complex, turbulent, and deeply pocketed surface in clay. He is known for such sculptures as ''The Thinker'', ''Monument to Balzac'', ''The Kiss (Rodin sculpture), The Kiss'', ''The Burghers of Calais'', and ''The Gates of Hell''. Many of Rodin's most notable sculptures were criticized, as they clashed with predominant figurative sculpture traditions in which works were decorative, formulaic, or highly Theme (arts), thematic. Rodin's most original work departed from traditional themes of mythology and allegory. He modeled the human body with naturalism, and his sculptures celebrate individual character and physicality. Although Rodin was sensitive to the controversy surrounding his work, he refused to change his sty ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
P-Delta Effect
In structural engineering, the P-Δ or P-delta effect refers to the abrupt changes in ground shear, overturning moment, and/or the axial force distribution at the base of a sufficiently tall structure or structural component when it is subject to a critical lateral displacement. A distinction can be made between P-delta effects on a multi-tiered building, written as P-Δ, and the effects on members deflecting within a tier, written as P-δ. P-delta is a second-order effect on a structure which is loaded laterally. One first-order effect is the initial deflection of the structure in reaction to the lateral load. The magnitude of the P-delta effect depends on the magnitude of this initial deflection. P-delta is a moment found by multiplying the force due to the weight of the structure and applied axial load, ''P'', by the first-order deflection, ''Δ'' or ''δ''. NUMERICAL EXAMPLE OF P DELTA EFFECT ON A CALCULATOR You have a 1 meter tall rigid vertical rod that rotates on a hin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moat
A moat is a deep, broad ditch dug around a castle, fortification, building, or town, historically to provide it with a preliminary line of defence. Moats can be dry or filled with water. In some places, moats evolved into more extensive water defences, including natural or artificial lakes, dams and sluices. In older fortifications, such as hillforts, they are usually referred to simply as ditches, although the function is similar. In later periods, moats or water defences may be largely ornamental. They could also act as a sewer. Historical use Ancient Some of the earliest evidence of moats has been uncovered around ancient Egyptian fortresses. One example is at Buhen, a settlement excavated in Nubia. Other evidence of ancient moats is found in the ruins of Babylon, and in reliefs from ancient Egypt, Assyria, and other cultures in the region. Evidence of early moats around settlements has been discovered in many archaeological sites throughout Southeast Asia, including ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diaphragm (structural System)
In structural engineering, a diaphragm is a structural element that transmits lateral loads to the vertical resisting elements of a structure (such as shear walls or frames). Diaphragms are typically horizontal but can be sloped in a gable roof on a wood structure or concrete ramp in a parking garage. The diaphragm forces tend to be transferred to the vertical resisting elements primarily through in- plane shear stress. The most common lateral loads to be resisted are those resulting from wind and earthquake actions, but other lateral loads such as lateral earth pressure or hydrostatic pressure can also be resisted by diaphragm action. The diaphragm of a structure often does double duty as the floor system or roof system in a building, or the deck of a bridge, which simultaneously supports gravity loads. Parts of a diaphragm include: *the collector (or membrane), used as a shear panel to carry in-plane shear *The drag strut member, used to transfer the load to the shear walls ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
