engineering

Schoharie Creek Bridge collapse

Schoharie Creek Bridge collapse is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Schoharie Creek Bridge collapse rather than just read about it. In short: The Schoharie Creek Bridge was a New York State Thruway (I-90) bridge over the Schoharie Creek near Fort Hunter and the Mohawk River in New York State. The bridge sits adjacent to the historic Schoharie Crossing.

Key takeaways

Schoharie Creek Bridge collapse belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Schoharie Creek Bridge collapse to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Schoharie Creek Bridge collapse from memory before moving on to harder problems.

Reference excerpt

The Schoharie Creek Bridge was a New York State Thruway (I-90) bridge over the Schoharie Creek near Fort Hunter and the Mohawk River in New York State. The bridge sits adjacent to the historic Schoharie Crossing. On April 5, 1987, it collapsed due to bridge scour at the foundations after a record rainfall. The collapse killed ten people. The replacement bridge was completed and fully open to traffic on May 21, 1988. The failure of the Schoharie Creek Bridge motivated improvement in bridge design and inspection procedures within New York and beyond.

Bridge design and construction

The final design for the bridge was approved in January 1952 by the New York State Department of Transportation (previously the New York State Department of Public Works). The design described a 540-foot (160 m) crossing consisting of five simply supported spans with nominal lengths of 100 feet (30.5 m), 110 feet (33.5 m), 120 feet (36.6 m), 110 feet (33.5 m), and 100 feet (30.5 m). The bridge was supported with pier frames along with abutments at each end. The pier frames were constructed of two slightly tapered columns with tie beams. The columns were fixed in place within a lightly reinforced plinth positioned on a shallow, reinforced spread footing. The spread footing was to be protected with a dry layer of riprap. The superstructure consisted of two longitudinal main girders with transverse floor beams. The skeleton of the bridge deck (7.9 inches (200 mm) thick) was made up of steel stringers. Construction began on February 11, 1953, by B. Perini and Sons, Inc.

Service The bridge was partially opened during the summer of 1954 before construction was completed. The Schoharie Creek Bridge (NY 1020940, New York State bridge identification number), began full service beginning in October 1954. In the spring and summer of 1955, the pier plinths began to show vertical cracks ranging from 0.12 to 0.20 in (3 to 5 mm), as a result of high tensile stresses in the concrete plinth. Almost a year later, on October 16, 1955, the bridge was damaged by a flood. In 1957, plinth reinforcement was added to each of the four piers.

Collapse

On the morning of April 5, 1987, during a high spring flood, the Schoharie Creek Bridge collapsed. A snowmelt combined with rainfall totaling 150 mm (5.9 in) produced an estimated 50-year flood on the creek. Pier three was the first to collapse, which caused the progressive collapse of spans three and four. Ninety minutes later pier two and span two collapsed. Two hours later pier one and span one shifted. A National Transportation Safety Board investigation suggested that pier two collapsed because the wreckage of pier three and the two spans may have partially blocked the river, redirecting and increasing the velocity of the flow of water to pier two. Six days later, 3.1 mi (5 km) upstream, a large section of the Mill Point Bridge collapsed. The bridge had been closed since the flood as a precaution, since inspection showed that its foundations had also been eroded.

Casualties At the time of the collapse, one car and one tractor-semitrailer were on the bridge. Before the road could be blocked off, three more cars drove into the gap. During the following three weeks, nine bodies were recovered from the river. The body of the 10th victim was recovered from the Mohawk River in July 1989.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Schoharie Creek Bridge collapse

Start with the simplest possible case. Write down what Schoharie Creek Bridge collapse claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Schoharie Creek Bridge collapse before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Schoharie Creek Bridge collapse ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Schoharie Creek Bridge collapse

In research: Schoharie Creek Bridge collapse appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Schoharie Creek Bridge collapse in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Schoharie Creek Bridge collapse is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1987 disasters in the United States, 1987 in New York (state), Bridge disasters caused by construction error, so understanding it makes those chapters shorter.
In everyday life: Look for Schoharie Creek Bridge collapse outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Schoharie Creek Bridge collapse in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Schoharie Creek Bridge collapse means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Schoharie Creek Bridge collapse out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Schoharie Creek Bridge collapse in simple terms?

Why does Schoharie Creek Bridge collapse matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Schoharie Creek Bridge collapse?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Schoharie Creek Bridge collapse.