Structural failures ppt

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Structural failures ppt

From Wikipedia, the free encyclopedia. See also: List of aircraft structural failuresList of bridge failuresList of dam failuresand List of catastrophic collapses of radio masts and towers.

Main article: Structural failure. This article may require cleanup to meet Wikipedia's quality standards. The specific problem is: No differentiation between each type of structural failure, extremely hard to navigate.

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Transportation failures should be placed in their relevant accident lists. Please help improve this article if you can. February Learn how and when to remove this template message. It has been suggested that portions of this article be split out into articles titled List of bridge failuresDam failureList of catastrophic collapses of radio masts and towers and List of aircraft structural failures. Discuss February This list is incomplete ; you can help by expanding it.

Archived from the original on Retrieved The Heritage Junction Dispatch. Santa Clara Valley Historical Society. Journal of Hydraulic Engineering. USA Today. Retrieved October 30, Fox News.

The New York Times. Archived from the original on 1 August Retrieved 29 July Retrieved 27 August Times of India.

Causes of Failure of Concrete Structures. - Civil Engineering Videos.

Retrieved 29 September Archived from the original on 13 October Retrieved 13 October BBC News. Retrieved 22 November Retrieved 20 February Star Tribune.It was almost non-existent in the past. Structures were known for the. Modern materials are said to be of better quality and of substantially. There have been rapid advancements in almost every technological.

Civil engineering is no exception. This has been backed by computerized support in planning, design. These advances in technology should have produced better and. Cracks could be broadly classified as structural or non- structural. Structural cracks. Sometimes there is a single simple explanation for a failure. But usually it is a combination of condition, mistakes, oversights, misunderstandings, ignorance, even dishonest performance, but not a single item by itself that can be picked as the sole and only cause of failure.

The dimension between success and failure in any construction operation is that of the thinnest hair. This is why the failure problem becomes interesting though uncertainty prevails. They range from defective temporary work to wrong construction procedures. Most of the construction failures can be attributed to acceptability standards, which are mostly left to individuals.

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There is usually vast variation in these standards depending upon an individuals grasp of the situation. Projects are sublet to sub contractors and their sub agencies. Each of these agencies look at the project to the extent they are involved without any regard to other agencies. Lack of co-ordination among such agencies is quite often because of failure. Deficiency in the basic design of a structure such as the amount of reinforcement at points of maximum moment, or incorrect dimension of concrete section to provide sufficient resistance for assumed loading, are extremely rare.

structural failures ppt

Lack of proper detailing like position of laps and splices, end anchorages, position of construction joints, lack of knowledge about length of bars are reasons for numerous failures. The engineering approach to earthquake resistant design must recognize the limitations of ground conditions, available materials And labour.

Foundation Movements Can be classified in two categories: Lateral spreading Settlement. The principal behind conceptual design is to keep the design as simple as possible and limit the points were stress concentrations can appear. To prevent this type of failure it is important to keep the designs symmetrical and simple. The figure is shown below. Detailing failures With a lot of building failures it is not always easy to see exactly why a structure.

This is especially true for detailing, as bad detailing is often one of a number of factors, which can weaken a structure. Bad detailing is the cause of large proportion older concrete buildings, which.The list of aircraft accidents and incidents caused by structural failures summarizes notable accidents and incidents such as the United Airlines Chesterton Crash due to a bombing and a B test that landed after the vertical stabilizer broke off. Loss of structural integrity during flight can be caused by:.

From Wikipedia, the free encyclopedia. Wikipedia list article. See also: List of airliner shootdown incidents. This article needs additional citations for verification.

structural failures ppt

Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Main article: List of structural failures and collapses. This transport-related list is incomplete ; you can help by expanding it. Retrieved Banshees of the Royal Canadian Navy. Archived from the original on We gotta bring this Buff in anyway". Archived from the original on June 4, Accident Investigation Board Norway.

Archived from the original on 19 September Retrieved 19 September Archived PDF from the original on 20 October Retrieved 20 October Post-earthquake observations following recent events in Indonesia point to the significant vulnerability of school infrastructure in the country. Build Change is a Denver-based international non-profit social enterprise that works with people in emerging nations to design, build, finance, and regulate disaster-resistant houses and schools.

Forensic practice in structural engineering typically entails seeking technical causes of failures. Occasionally, discussions of technical causes are disseminated through publications or conference presentations. However, the underlying or root causes of failures are seldom disseminated, because they are rarely sought. This article reviews the failure mechanisms of the Tacoma Narrows Bridge TNB on November 7,and the characteristics of the original bridge that facilitated the resultant theories on its failure.

The design of the bridge pushed the boundaries of knowledge at the time, unfortunately with undesired consequences. When litigation follows structural failure, the value of experienced on-site observers should not be understated. Those on-site professionals who prefer to leave such matters to insurance investigators and hired expert witnesses need to reconsider. Without a solid basis in fact, the legal process has a decreased probability of achieving the justice which is expected.

A straight-line wind event took place in Rockwall, Texas, March 29,producing significant structural damage resulting in four red- and five yellow-tagged homes.

Structural engineering always has been a conservative profession. This is particularly evident in the structural building codes and standards. These regulations are intended to protect the public from deficiencies in design and construction.

For the most part, they are effective. Why then do so many parking garages collapse? It was a time of celebration at the Kansas City Hyatt on July 17,35 years ago. Between 1, and 2, people were in attendance at the Tea Dance, enjoying the band, the music, the food, the drink and the dance contest.

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Unfortunately, what began as an evening of celebration would be remembered for the tragic deaths resulting from the most catastrophic failure of a structural connection in the United States. In the wee hours of August 24, am to be precisemost of the Bay Area was awakened by a 6. Many failures occur in concrete structures because of inadequate detailing of reinforcement in joints and connections. The failures of perimeter vehicular barriers in concrete parking structures offer grim examples where numerous parking patrons have died or have suffered bodily injuries as their vehicles plunged down to the street during the past several years.

Review Category : Structural Failures.

List of structural failures and collapses

An International Collaboration Post-earthquake observations following recent events in Indonesia point to the significant vulnerability of school infrastructure in the country. Mwangi, Ph. In Structural Failures Comments 0.

Recurring Structural Failures Forensic practice in structural engineering typically entails seeking technical causes of failures. Jul, By Sumanth Cheruku, E.

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Jun, By John L.Earthquakes are the most destructive natural hazards throughout human history. Occurred medium or high-intensity magnitude earthquakes in last twenty years showed that these loses continue. These are the main reasons. In addition to this, low quality of structural materials, poor workmanship, lack of engineering services, and construction with insufficient detailing of the structural elements are the another reasons of damages.

Main reasons of masonry building damages in terms of design faults can be shown as heavy earthen roofs, inappropriate detailing of wall to wall connection and wall to roof connection, absence of bond beams, large openings. However, construction of buildings by using local materials with poor workmanship on the base of traditional rules is the other reason of failures for these buildings. In this book chapter, earthquakes and reasons of damages arose from earthquakes for reinforced concrete and masonry structures were presented.

In addition to this, appropriate solutions are suggested. Earthquakes - Tectonics, Hazard and Risk Mitigation. Earthquakes are one of the most destructive natural hazards that cause huge amount of loss of life and property. Nearly 10, people were killed every year because of these hazards.

Earthquakes and Structural Damages

Moreover, annual economic loss is in the billions of dollars. In Kocaeli earthquakes, more than 17, people were killed and more than 40, people were injured andpeople became homeless. In the yearan earthquake hit the Sichuan China. Measured magnitude of earthquake from surface is 8.

structural failures ppt

In addition, more thaninjured and 18, people missing. However, total economic loss was 16 billion dollars during this earthquake. Many historical structures were collapsed and heavily damaged. After these earthquakes, people were killed and people were injured, among of them people were seriously injured.

A total of multistorey structures were collapsed. The purpose of this chapter was to present earthquake characteristics and structural defects, damages, and possible solutions. Section 2 shows structure of the earth, plate tectonics, seismic waves, faults, and effects of earthquakes.To browse Academia. Skip to main content. Log In Sign Up. JOAE Editor. Then when the structure does not able to transmit these loads safely to the foundations then it under go failure which is called the structural failure [1][2].

Keywords: Structural failure, stressed, load transfer, foundations, bridge. Insufficient lap length is also a major We can learn much more from failure than success. The structural failure is reinforcement. Professional the beam-column, beam-slab. Even an excellently designed and constructed structure will not stand on a bad foundation.

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The Leaning Tower of Pisa is a famous example of bad foundations[4][7], but there are many others. The displacements due to bad foundations may alter the stress distribution significantly. A small eccentricity can result great moment and failure of structure. It might have worked. Lesson learned from the past structural Press, Detroit, Chiles, Harper member.

Temperature reinforcement should also Business, New York, Related Papers. By Subramanian Narayanan. By jack sparrow.This article investigates the cause of the failure of some parts of a two-storey building under construction, in Oba-Ile, Akure, Ondo State, Nigeria.

The article examines the effect of the quality of sand used for concrete production on the quality of concrete produced from them. The article also investigates whether the provided main and shear reinforcements in buildings complied with the provisions of the BS Site inspections were carried out, and concrete samples were taken.

Many of the structural components were exposed, so as to determine the number of reinforcements in each structural element, the anchorage length of main reinforcement provided and the spacing of shear reinforcement. The results of both the destructive and non-destructive tests show that the average compressive strength of the concrete is 9. The anchorage length provided is less than the value stipulated by the code.

From the above investigation, the possible cause of the collapse of the building is the provision of anchorage length less than required, spacing of shear reinforcement is less than required and, the poor quality of the concrete used for the construction.

structural failures ppt

In his report, Adeoye noted that between December and Januarythere were over 30 cases of collapse of buildings reported across the country, with well over persons losing their lives and several others being severely injured. In addition, Amanda-Ayafa noted that between May and April over 22 cases of building failure were reported in Lagos State. Between January and Augustover eight cases of building collapse were recorded in the country.

Hence, as a matter of responsibility, the Federal Government, Ministry of Works and Housing, State and Local Governments, including private individuals and professional bodies should be concerned.

Figure 1 shows the collapsed part of the building under investigation, whereas Figures 2 and 3 show the reconstructed combined footing with the column reinforcement of the collapsed part of the building. The reconstructed combined footing with the column reinforcement of the collapsed part of the building.

Causes and Prevention of Structural Failures

In the current construction industry in Nigeria, concrete has emerged as the most common building material. It is also worth noting that per cent of the collapsed buildings in Nigeria were constructed from reinforced concrete. Hence, careful consideration must be given to factors that affect the strength of reinforced concrete. The constituent materials for concrete are: cement, fine aggregate, coarse aggregate and water. Concrete is a very variable material, having a wide range of strengths.

Concrete generally increases its strength with age. The precise relationship will depend on the type of cement used Mosley et al, It is important that the aggregates for making concrete should be free of all sorts of impurities BS It is very important to control the quality of the aggregate to be used in concrete making.

To develop safe design recommendations, a database of beam tests without shear reinforcement was compiled. The database consisted of laboratory specimens tested under single and double point loads and 64 beams subjected to uniformly distributed loads. Equation Using equation 22.

However, the British Standard presented the value of the nominal shear strength of concrete in tabular form Table 3. Equation 5 of the BS is rewritten as. As reinforced concrete is a composite material, for it to work effectively there must be no slip between the concrete and reinforcing bars.


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