|
Reinforcing Bar
Rebar (short for reinforcement bar or reinforcing bar), known when massed as reinforcing steel or steel reinforcement, is a Tension (physics), tension device added to concrete to form ''reinforced concrete'' and reinforced masonry structures to strengthen and aid the concrete under tension. Concrete is strong under Compression (physics), compression, but has low tensile strength. Rebar usually consists of steel bars which significantly increase the tensile strength of the structure. Rebar surfaces feature a continuous series of ribs, lugs or indentations to promote a better bond with the concrete and reduce the risk of slippage. The most common type of rebar is carbon steel, typically consisting of hot-rolled round bars with deformation patterns embossed into its surface. Steel and concrete have similar Coefficient of thermal expansion, coefficients of thermal expansion, so a concrete structural member reinforced with steel will experience minimal differential Stress (mechanics), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
A Bunch Of Rebar
A, or a, is the first Letter (alphabet), letter and the first vowel letter of the Latin alphabet, used in the modern English alphabet, and others worldwide. Its name in English is ''English alphabet#Letter names, a'' (pronounced ), plural ''aes''. It is similar in shape to the Ancient Greek letter alpha, from which it derives. The uppercase version consists of the two slanting sides of a triangle, crossed in the middle by a horizontal bar. The lowercase version is often written in one of two forms: the double-storey and single-storey . The latter is commonly used in handwriting and fonts based on it, especially fonts intended to be read by children, and is also found in italic type. In English, ''English articles, a'' is the indefinite article, with the alternative form ''an''. Name In English, the name of the letter is the ''long A'' sound, pronounced . Its name in most other languages matches the letter's pronunciation in open syllables. History The earliest know ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Classical Antiquity
Classical antiquity, also known as the classical era, classical period, classical age, or simply antiquity, is the period of cultural History of Europe, European history between the 8th century BC and the 5th century AD comprising the interwoven civilizations of ancient Greece and ancient Rome, Rome known together as the Greco-Roman world, centered on the Mediterranean Basin. It is the period during which ancient Greece and Rome flourished and had major influence throughout much of Europe, North Africa, and West Asia. Classical antiquity was succeeded by the period now known as late antiquity. Conventionally, it is often considered to begin with the earliest recorded Homeric Greek, Epic Greek poetry of Homer (8th–7th centuries BC) and end with the fall of the Western Roman Empire in 476 AD. Such a wide span of history and territory covers many disparate cultures and periods. ''Classical antiquity'' may also refer to an idealized vision among later people of what was, in Ed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lightning Rod
A lightning rod or lightning conductor (British English) is a metal rod mounted on a structure and intended to protect the structure from a lightning strike. If lightning hits the structure, it is most likely to strike the rod and be conducted to ground through a wire, rather than passing through the structure, where it could start a fire or even cause electrocution. Lightning rods are also called finials, air terminals, or strike termination devices. In a lightning protection system, a lightning rod is a single component of the system. The lightning rod requires a connection to the earth to perform its protective function. Lightning rods come in many different forms, including hollow, solid, pointed, rounded, flat strips, or even bristle brush-like. The main attribute common to all lightning rods is that they are all made of conductive materials, such as copper and aluminum. Copper and its alloys are the most common materials used in lightning protection. History The first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tented Roof
A tented roof (also known as a pavilion roof) is a type of polygonal hip roof, hipped roof with steeply pitched slopes rising to a peak.W. Dean EastmanHometown Handbook: Architecture./ref> Tented roofs, a hallmark of medieval religious architecture, were widely used to cover churches with steep, conical roof structures. In the Queen Anne style architecture, Queen Anne Victorian style, it took the form of a wooden Turret (architecture), turret with an octagonal base with steeply pitched slopes rising to a peak, usually topped with a finial. A distinctive local adaptation of this roof style was widely used in 16th- and 17th-century Russian architecture for Church (building), churches, although there are examples of this style also in other parts of Europe. It took the form of a polygonal spire but differed in purpose in that it was typically used to roof the main internal space of a church, rather than as an auxiliary structure. The same architectural form is also applied to bell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corrosion
Corrosion is a natural process that converts a refined metal into a more chemically stable oxide. It is the gradual deterioration of materials (usually a metal) by chemical or electrochemical reaction with their environment. Corrosion engineering is the field dedicated to controlling and preventing corrosion. In the most common use of the word, this means electrochemical oxidation of metal in reaction with an oxidant such as oxygen, hydrogen, or hydroxide. Rusting, the formation of red-orange iron oxides, is a well-known example of electrochemical corrosion. This type of corrosion typically produces oxides or salts of the original metal and results in a distinctive coloration. Corrosion can also occur in materials other than metals, such as ceramics or polymers, although in this context, the term "degradation" is more common. Corrosion degrades the useful properties of materials and structures including mechanical strength, appearance, and permeability to liquids and ga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wrought Iron
Wrought iron is an iron alloy with a very low carbon content (less than 0.05%) in contrast to that of cast iron (2.1% to 4.5%), or 0.25 for low carbon "mild" steel. Wrought iron is manufactured by heating and melting high carbon cast iron in an open charcoal or coke hearth or furnace in a process known as puddling. The high temperatures cause the excess carbon to oxidise, the iron being stirred or puddled during the process in order to achieve this. As the carbon content reduces, the melting point of the iron increases, ultimately to a level which is higher than can be achieved by the hearth, hence the wrought iron is never fully molten and many impurities remain. The primary advantage of wrought iron over cast iron is its malleability - where cast iron is too brittle to bend or shape without breaking, wrought iron is highly malleable, and much easier to bend. Wrought iron is a semi-fused mass of iron with fibrous slag inclusions (up to 2% by weight), which give it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Akinfiy Demidov
Akinfiy Nikitich Demidov () (1678 Tula - 5 August 1745 Yatskoye Ustye, Menzelinsky Uyezd, Orenburg Governorate) was a Russian industrialist of the Demidov family. Life He was the eldest son of Nikita Demidov and increased the family fortune, raising it to one of Russia's most important industrial dynasties. He studied the secrets of metallurgical production in Saxony. He zealously set to work and became the creator of the "empire" of the Demidovs, which by the middle of the 18th century produced 52% of all Russian metal. He set up at least nine steel foundries and munitions factories from 1717 to 1735, and had 25 by his death. He also created iron and copper mines in the Urals and Western Siberia to supply them and mines for precious and semi-precious stones, silver and gold. Akinfiy Nikitich Demidov was a shrewd, energetic, yet ruthless and avaricious industrialist. His biography encompassed a remarkable range of endeavors: founding factories and even cities, navigating c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leaning Tower Of Nevyansk
The Leaning Tower of Nevyansk () is a tower built in the 18th century located within the town of Nevyansk, Sverdlovsk Oblast, Russia. The construction was funded by the blacksmith and industrialist Nikita Demidov and later his son Akinfiy Demidov, a famous Russian manufacturer and associate of Peter I of Russia, Peter I. However, the architect is not presently known. The height of the tower is , while its base is wide. The deviation of the top part of the tower, from the vertical, is approximately 3 degrees. The exact date of construction is unknown, but Russian historians believe that it was built between 1721 and 1745. The tower is prominently featured within the town's flag and coat of arms. Following the restoration, the Nevyansk Tower was opened to the public. Guided tours are provided by a local museum and tourist guides from Yekaterinburg. Technical parameters *The base is a square with sides of 9.5 metres. *Vertical deviation of the tower is about 1.85 metres. *Secu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Structural System
The term structural system or structural frame in structural engineering refers to the load-resisting sub-system of a building or object. The structural system transfers loads through interconnected elements or members. Commonly used structures can be classified into five major categories, depending on the type of primary stress that may arise in the members of the structures under major design loads. However any two or more of the basic structural types described in the following may be combined in a single structure, such as a building or a bridge in order to meet the structure's functional requirements.Kassimali, A. (1999). ''Structural analysis''. 2nd edition. Pacific Grove, C.A.: PWS Publication. * Tensile structures: Members of tensile structures are subject to pure tension under the action of external loads. Because the tensile stress is uniformly distributed over the cross-sectional area of members, the material of such a structure is utilized in the most efficient ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Château De Vincennes
The Château de Vincennes () is a former fortress and royal residence next to the town of Vincennes, on the eastern edge of Paris, alongside the Bois de Vincennes. It was largely built between 1361 and 1369, and was a preferred residence, after the Palais de la Cité, of French kings in the 14th to 16th century. It is particularly known for its "donjon" or keep, a fortified central tower, the tallest in Europe, built in the 14th century, and for the chapel, Sainte-Chapelle de Vincennes, begun in 1379 but not completed until 1552, which is an exceptional example of Flamboyant Gothic architecture. Because of its fortifications, the château was often used as a royal sanctuary in times of trouble, and later as a prison and military headquarters. The chapel was listed as an historic monument in 1853, and the keep was listed in 1913. Most of the building is now open to the public. History 12th–14th century – Louis VII to Saint Louis The first royal residence was created by an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cupolas
In architecture, a cupola () is a relatively small, usually dome-like structure on top of a building often crowning a larger roof or dome. Cupolas often serve as a roof lantern to admit light and air or as a lookout. The word derives, via Italian, from lower Latin ''cupula'' (classical Latin ''cupella''), (Latin ''cupa''), indicating a vault resembling an upside-down cup. The cylindrical drum underneath a larger cupola is called a tholobate. Background The cupola evolved during the Renaissance from the older oculus. Being weatherproof, the cupola was better suited to the wetter climates of northern Europe. The chhatri, seen in Indian architecture, fits the definition of a cupola when it is used atop a larger structure. Cupolas often serve as a belfry, belvedere, or roof lantern above a main roof. In other cases they may crown a spire, tower, or turret. Barns often have cupolas for ventilation. Cupolas can also appear as small buildings in their own right. The square, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vault (architecture)
In architecture, a vault (French ''voûte'', from Italian ''volta'') is a self-supporting arched form, usually of stone or brick, serving to cover a space with a ceiling or roof. As in building an arch, a temporary support is needed while rings of voussoirs are constructed and the rings placed in position. Until the topmost voussoir, the Keystone (architecture), keystone, is positioned, the vault is not self-supporting. Where timber is easily obtained, this temporary support is provided by centering consisting of a framed truss with a semicircular or Circular segment, segmental head, which supports the voussoirs until the ring of the whole arch is completed. The Mycenaean Greece, Mycenaeans (ca. 18th century BC, 1800–1050s BC, 1050 BC) were known for their Tholos (architecture), tholos tombs, also called beehive tombs, which were underground structures with conical vaults. This type of vault is one of the earliest evidences of curved brick architecture without the use of ston ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
