Application and Development of Isolation Technology-essay代写

留学生essay代写精选范文：“Application and Development of Isolation Technology”，这篇论文讨论了隔震技术的应用与发展。隔震技术，就是利用隔震层去提高建筑物的抗震能力。大概在上世纪60年代的时候，隔震技术就开始发展了。发展到现在，隔震系统可以分为几个体系了。相比于一般的抗震技术，应用隔震技术可以使结构不被破坏，并保护了内部的设备。应用隔震技术，很大程度上能减少地震带来的危害。

As one of the world's leading earthquake disaster, has been causing great loss of human life and property. According to statistics, more than 500 million times each year about earthquakes on Earth, that is thousands of times every day of the earthquake to happen. Most of which are too small or too far away, so that people feel; can really cause serious harm to human earthquake about ten to twenty times; in particular, can cause severe earthquake disaster about once or twice. So the earthquake has been threatening human life or lives. Earthquake disaster for humanity loss is immeasurable, in a foreign country, an earthquake occurred in Chile May 22, 1960, the epicenter in Concepcion. From May 21 to June 22, it had a total of at least magnitude 7 earthquake occurred 10 times, three times more than eight. The May 22 earthquake, a magnitude of 8.9. The heaviest earthquake devastated areas from Santiago to Puerto Montt and other places. Tsunami generated by an earthquake across the Pacific coast of Japan was the tsunami waves up to 4 meters, causing huge disasters. Because of this earthquake is very strong, it aroused significant free oscillation Earth. December 26, 2004, Indian Ocean tsunami, ocean center of Richter magnitude 9.2, released energy equivalent to 23,000 atomic bomb centralized energy explosion, earthquake triggered a tsunami struck 11 Indian Ocean countries, the number of victims nearly 23 million people. In China in 1976, China Tangshan Richter 7.8 earthquake, which caused 242,000 deaths. Tangshan earthquake had no significant pre-earthquake, Yu Zhen lasted for 16 hours. Tangshan earthquake is one of the ten natural disasters of the 20th century. 2008 May 12, southwest China's Sichuan Province suffered the Richter 7.9 earthquake struck, nearly 70,000 people were killed and more than 1,000 people homeless, property damage of more than $ 86 billion.

Development strategy thought seismic engineering structures, there are four stages, the first stage is the "hard and soft dispute" in history, namely the view that some of the more strong seismic performance of building structures built the better, such as the Soviet Kremlin and other buildings. But the drawback is too bulky structure, material waste. The second phase of "war of attrition" - the main structural damage. The purpose of the energy consumption of the earthquake, so that the remaining part of the energy is not enough to destroy buildings. The third is the "defensive", i.e. the main structure protected from damage by isolation and energy component. For example, isolated or partially consumed energy by adding the generated seismic isolation bearing or damping member. The fourth stage is "amnesty" - seismic energy storage and practical application. The aim is to be generated by the use of seismic energy, but is still in the research stage.

With the development of the project, application isolation technology more widely, isolation system can be divided into story isolation system, base isolation system, suspension system and co-ordination isolation mass damper system [ 1]. Interlayer seismic isolation layer is disposed between the upper structural layer and the layer construction, isolation and base isolation layer is disposed between the base and superstructure. Isolation system typically consists essentially of isolation bearing and a damper. Isolators are generally divided into three categories, the laminated rubber bearings, rolling bearings sliding isolation isolation bearing friction, particularly the classification shown below.

Isolation technology have great advantages compared to ordinary seismic technology, studies have shown that earthquakes reduce buildings to a large extent the application of seismic isolation device dynamic response. The interlayer isolation structure displacement, acceleration response, interlayer shear value is much smaller than a general structure. Application of isolation techniques can effectively "isolated" earthquake, not only the structure is not damaged, and the internal structure and protect the equipment, apparatus and the like from damage. During an earthquake, protect communications equipment, important military equipment from damage, is very significant.

The present stage of project development is more mature rubber bearings, but the higher cost of rubber bearings, rubber aging make it easy to shorten the useful life of the structure itself. Sliding isolation bearing on bridge building and also has applications, at present, the application of sliding isolation in our project is still in its infancy, mainly due to a variety of sliding friction type bearings are a lot of balls , rollers, coated steel or the like as the seismic isolation device slip material, although having a high capacity, low cost, durability, simple production characteristics, but there are some problems, sliding isolation bearings are generally PTFE as a friction energy material. However, in practical applications but there polytetrafluoroethylene cold flow, high melt viscosity, poor adhesion, high axial compression and deformation at a high temperature 400 deg.] C will decompose the problem of toxic gases. Secondly, the difference between the reset friction sliding isolation bearing capacity, and so often combined rubber bearings, and energy consumption by increasing the damping means. To improve the overall effect of seismic isolation system.

Of 41% of the land, more than 50% of the city is located on seismic intensity of 7 degrees above the zone, facing the earthquake disaster situation is very Yan Jun. Now China has promulgated the "Seismic Design of Buildings" and "building isolation rubber bearings" and other national standards and industry standards, standardized design requirements and performance of products, seismic isolation technology has been listed as the Ministry of Housing and Urban-Rural Development key scientific and technological achievements to promote the project. With the successful application of the practice of building isolation rubber bearings project, implementation of the national earthquake disaster mitigation measures, progress and improvement of people's awareness of the seismic isolation rubber bearings construction application technology, application earthquake rubber block will become increasingly widespread and broad development prospects.

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