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Rome is the city of echoes, the city of illusions, the city of yearing

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01st-Jun-2018       
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Maruf  Zakaria :
Roman architecture was unlike anything that had come before. The Persians, Egyptians, Greeks and Etruscans all had monumental architecture. The grandeur of their buildings, though, was largely external. Buildings were designed to be impressive when viewed from outside because their architects all had to rely on building in a post-and-lintel system, which means that they used two upright posts, like columns, with a horizontal block, known as a lintel, laid flat across the top.
A good example is this ancient Greek Temple in Paestum, Italy.
 Since lintels are heavy, the interior spaces of buildings could only be limited in size. Much of the interior space had to be devoted to supporting heavy loads. They were trying to do some extra things that relate to their architecture style.
 Roman architecture differed fundamentally from this tradition because of the discovery, experimentation and exploitation of concrete, arches and vaulting (a good example of this is the Pantheon, c. 125 CE). Thanks to these innovations, from the first century CE. Romans were able to create interior spaces that had previously been unheard of. Romans became increasingly concerned with shaping interior space rather than filling it with structural supports. As a result, the insides of Roman buildings were as impressive as their exteriors.
The Roman Architectural Revolution, also known as the Concrete Revolution was the widespread use in Roman architecture of the previously little-used architectural forms of the arch, vault, and dome. For the first time in history, their potential was fully exploited in the construction of a wide range of civil engineering structures, public buildings, and military facilities. These included amphitheatres, aqueducts, baths, bridges, circuses, dams, domes, harbours, temples, and theatres.
The Romans were the first builders in the history of architecture to realize the potential of domes for the creation of large and well-defined interior spaces. Domes were introduced in a number of Roman building types such as temples, thermae, palaces, mausolea and later also churches. Half-domes also became a favoured architectural element and were adopted as apses in Christian sacred architecture.
Monumental domes began to appear in the 1st century BC in Rome and the provinces around the Mediterranean Sea. Along with vaults, they gradually replaced the traditional post and lintel construction which makes use of the column and architrave.
The construction of domes was greatly facilitated by the invention of concrete; a process which has been termed the Roman Architectural Revolution. Their enormous dimensions remained unsurpassed until the introduction of structural steel frames in the late 19th century.
Roman cities were typically focused on the forum (a large open plaza, surrounded by important buildings), which was the civic, religious and economic heart of the city. It was in the city’s forum that major temples (such as a Capitoline temple, dedicated to Jupiter, Juno and Minerva) were located, as well as other important shrines. Also useful in the forum plan were the basilica (a law court), and other official meeting places for the town council, such as a curia building.
 Quite often the city’s meat, fish and vegetable markets sprang up around the bustling forum. Surrounding the forum, lining the city's streets, framing gateways, and marking crossings stood the connective architecture of the city: the porticoes, colonnades, arches and fountains that beautified a Roman city and welcomed weary travelers to town. Pompeii, Italy is an excellent example of a city with a well preserved forum.
Materials, Methods and Innovations
Long before concrete made its appearance on the building scene in Rome, the Romans utilized a volcanic stone native to Italy called tufa to construct their buildings. Although tufa never went out of use, travertine began to be utilized in the late 2nd century BCE because it was more durable. Also, its off-white color made it an acceptable substitute for marble was slow to catch on in Rome during the Republican period since it was seen as an extravagance, but after the reign of Augustus (31 BCE - 14 CE), marble became quite fashionable. Augustus had famously claimed in his funerary inscription, known as the Res Gestae, that he “found Rome a city of brick and left it a city of marble” referring to his ambitious building campaigns.
Roman concrete (opus caementicium), was developed early in the 2nd c. BCE.  The use of mortar as a bonding agent in ashlar masonry wasn't new in the ancient world; mortar was a combination of sand, lime and water in proper proportions. The major contribution the Romans made to the mortar recipe was the introduction of volcanic Italian sand (also known as ‘pozzolana’).
The Roman builders who used pozzolana rather than ordinary sand noticed that their mortar was incredibly strong and durable. It also had the ability to set underwater. Brick and tile were commonly plastered over the concrete since it was not considered very pretty on its own, but concrete’s structural possibilities were far more important.
The invention of opus caementicium initiated the Roman architectural revolution, allowing for builders to be much more creative with their designs. Since concrete takes the shape of the mold or frame it is poured into, buildings began to take on ever more fluid and creative shapes.
The Romans also exploited the opportunities afforded to architects by the innovation of the true arch (as opposed to a corbelled arch where stones are laid so that they move slightly in toward the center as they move higher). A true arch is composed of wedge-shaped blocks (typically of a durable stone), called voussoirs, with a key stone in the center holding them into place.
In a true arch, weight is transferred from one voussoir down to the next, from the top of the arch to ground level, creating a sturdy building tool. True arches can span greater distances than a simple post-and-lintel.
The use of concrete, combined with the employment of true arches allowed for vaults and domes to be built, creating expansive and breathtaking interior spaces.
Roman Architects
We don’t know much about Roman architects.  Few individual architects are known to us because the dedicatory inscriptions, which appear on finished buildings, usually commemorated the person who commissioned and paid for the structure. We do know that architects came from all walks of life, from freedmen all the way up to the Emperor Hadrian, and they were responsible for all aspects of building on a project.
The architect would design the building and act as engineer; he would serve as contractor and supervisor and would attempt to keep the project within budget.
This practice of architecture create new era and make example of pure architecture. Their structure development arrangement of functions and proportion sense of totally remarkable. In fact, in the name of great builders their should always first name of Roman architecture which makes a tremendous impact on work of pioneer and master architects and architecture posture. n
(Maruf  Zakaria, 4th year 2nd semester
student, Department of Architecture at
Ahsanullah University of Science
and Technology)

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