The Bridge That Swayed IELTS Reading Answers with Explanation

Luyện tập đề IELTS Reading Practice với passage The Bridge That Swayed được lấy từ cuốn sách IELTS Actual Test 3 - Test 1 - Passage 2 với trải nghiệm thi IELTS trên máy và giải thích đáp án chi tiết bằng Linearthinking, kèm list từ vựng IELTS cần học trong bài đọc.
The Bridge That Swayed IELTS Reading Answers with Explanation

📖 Bài đọc (reading passage)

The Bridge that swayed
When the London Millennium footbridge was opened in June 2000, it swayed alarmingly. This generated huge public interest and the bridge became known as London’s “wobbly bridge. ” The Millennium Bridge is the first new bridge across the river Thames in London since Tower Bridge opened in 1894, and it is the first ever designed for pedestrians only. The bridge links the City of London near St Paul’s Cathedral with the Tate Modern art gallery on Bankside. The bridge opened initially on Saturday 10th June 2000. For the opening ceremony, a crowd of over 1,000 people had assembled on the south half of the bridge with a band in front. When they started to walk across with the band playing, there was immediately an unexpectedly pronounced lateral movement of the bridge deck. “It was a fine day and the bridge was on the route of a major charity walk,” one of the pedestrians recounted what ho saw that day. “At first, it was still. Then it began to sway sideways, just slightly. Then, almost from one moment to the next, when large groups of people were crossing, the wobble intensified. Everyone had to stop walking to retain balance and sometimes to hold onto the hand rails for support.” Immediately it was decided to limit the number of people on the bridge, and the bridge was dubbed the ‘wobbly’ bridge by the media who declared it another high-profile British Millennium Project failure. In older to fully investigate and resolve the issue the decision was taken to close the bridge on 12th June 2000. Arup, the leading member of the committee in charge of the construction of the bridge, decided to tackle the issue head on. They immediately undertook a fast-track research project to seek the cause and the cure. The embarrassed engineers found the videotape that day which showed the center span swaying about 3 inches sideways every second and the south span 2 inches every 1.25 seconds. Because there was a significant wind blowing on the opening days (force 3-4) and the bridge had been decorated with large flags, the engineers first thought that winds might be exerting excessive force on the many large flags and banners, but it was rapidly concluded that wind buffeting had not contributed significantly to vibration of the bridge. But after measurements were made in university laboratories of the effects of people? walking on swaying platforms and after large-scale experiments with crowds of pedestrians were conducted on the bridge itself, a new understanding and a new theory were developed. The unexpected motion was the result of a natural human reaction to small lateral movements. It is well known that a suspension bridge has tendency to sway when troops march over it in lockstep, which is why troops arc required to break step when crossing such a bridge. “If we walk on a swaying surface we tend to compensate and stabilise ourselves by spreading our legs further apart but this increases the lateral push”. Pat Dallard, the engineer at Arup, says that you change the way you walk to match what the bridge is doing. It is an unconscious tendency for pedestrians to match their footsteps to the sway, thereby exacerbating it even more. “It’s rather like walking on a rolling ship deck you move one way and then the other to compensate for the roll.” The way people walk doesn’t have to match exactly the natural frequency of the bridge as in resonance the interaction is more subtle. As the bridge moves, people adjust the way they walk in their own manner. The problem is that when there are enough people on the bridge the total sideways push can overcome the bridge’s ability to absorb it. The movement becomes excessive and continues to increase until people begin to have difficulty in walking they may even have to hold on to the rails. Professor Fujino Yozo of Tokyo University, who studied the earth-resistant Toda Bridge in Japan, believes the horizontal forces caused by walking, running or jumping could also in turn cause excessive dynamic vibration in the lateral direction in the bridge. He explains that as the structure began moving, pedestrians adjusted their gait to the same lateral rhythm as the bridge; the adjusted footsteps magnified the motion just like when four people all stand up in small boat at the same time. As more pedestrians locked into the same rhythm, the increasing oscillation led to the dramatic swaying captured on film until people stopped walking altogether, because they could not even keep upright. In order to design a method of reducing the movements, an immediate research program was launched by the bridge’s engineering designer Arup. It was decided that the force exerted by the pedestrians had to be quantified and related to the motion of the bridge. Although there are some descriptions of this phenomenon in existing literature, none of these actually quantifies the force. So there was no quantitative analytical way to design the bridge against this effect. The efforts to solve the problem quickly got supported by a number of universities and research organisations. The tests at the University of Southampton involved a person walking on the spot on a small shake table. The tests at Imperial College involved persons walking along a specially built, 7.2m-long platform, which could be driven laterally at different frequencies and amplitudes. These tests have their own limitations. While the Imperial College test platform was too short that only seven or eight steps could be measured at one time, the “walking on the spot” test did not accurately replicate forward walking, although many footsteps could be observed using this method. Neither test could investigate any influence of other people in a crowd on the behavior of the individual tested. The results of the laboratory tests provided information which enabled the initial design of a retrofit to be progressed. However, unless the usage of the bridge was to be greatly restricted, only two generic options to improve its performance were considered feasible. The first was to increase the stiffness of the bridge to move all its lateral natural frequencies out of the range that could be excited by the lateral footfall forces, and the second was to increase the damping of the bridge to reduce the resonant response.

❓ Câu hỏi (questions)

Question 1 - 4
Choose FOUR letters, A-I.
Which FOUR of the following could be seen on the day when the bridge opened to the public?
A
the bridge moved vertically
B
the bridge swayed from side to side
C
the bridge swayed violently throughout the opening ceremony
D
it was hard to keep balance on the bridge
E
pedestrians walked in synchronised steps
F
pedestrians lengthened their footsteps
G
a music band marched across the bridge
H
the swaying rhythm varied to the portions of the bridge
I
flags and banners kept still on the bridge
Question 5 - 10
Complete the summary below. Choose NO MORE THAN TWO WORDS from the passage for each answer.
To understand why the Millennium Bridge swayed, engineers of Arup studied the videotape taken on the day of the opening ceremony. In the beginning they thought the forces of 
5
might have caused the movement because there were many flags and banners on the bridge that day. But quickly new understandings arose after series of tests were conducted on how people walk on 
6
floors. The tests showed people would place their leg 
7
to keep balance when the floor is shaking. Pat Dallard even believes pedestrians may unknowingly adjust their 
8
to match the sway of the bridge. Professor Fujino Yozo’s study found that the vibration of a bridge could be caused by the 
9
. of people walking, running and jumping on it because the lateral rhythm of the sway could make pedestrians adjust their walk and reach the same step until it is impossible to stand 
10

Question 11 - 13
Complete the table below.
Choose NO MORE THAN THREE WORDS from the passage for each answer.

🔥 Answer key (đáp án và giải thích)

1
B
Rút gọn

Giải thích chi tiết



Hiểu câu hỏi: The bridge swayed from side to side

=> Cây cầu đung đưa qua 2 bên

=> Với 'side to side' = 'sideways'

=> Dễ dàng chọn được đáp án B

>>> Và vì cây câu được cho là 'swayed sideways' -> Ta có thể loại đáp án A - moved vertically (di chuyển theo chiều dọc)



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2
D
Mở rộng

Giải thích chi tiết



Áp dụng Linearthinking để nắm main idea:

 1 Then, when large groups of people were crossing, the wobble intensified. 

 2 Everyone had to stop walking to retain balance and to hold onto the hand rails for support

=> 1 + 2 : Khi sự đung đưa (wobble) trở nên mạnh hơn (intensified) - mọi người phải đứng lại và vịn vào thành cầu để giữ thăng bằng

=> Khó giữ thăng bằng trên cầu -> Chọn đáp án D



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3
H
Mở rộng

Giải thích chi tiết



Áp dụng Linearthinking để nắm main idea:

Hiểu câu hỏi: the swaying rhythm varied to the portions of the bridge

=> Nhịp độ đung đưa thay đổi tùy theo các phần của cầu

Phân tích info: the center span swaying about 3 inches sideways every second and the south span  2 inches every 1.25 seconds

=> Ta thấy ở center span và south span (2 phần khác nhau của cầu) có nhịp độ đung đưa khác nhau

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4
E
Mở rộng

Giải thích chi tiết



Áp dụng Linearthinking để nắm main idea:

Hiểu câu hỏi: Pedestrians walked in synchronized steps

=> Người đi bộ bước đi đồng đều

>>> Trong trường hợp không hiểu 'synchronized' là gì, ta vẫn có thể dựa vào từ 'pedestrians' + 'steps' để tìm được thông tin



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5
wind
Mở rộng

Giải thích chi tiết



Dựa vào thông tin 'many flags and banners', ta có thể khoanh vùng được thông tin cần đọc



Áp dụng Linearthinking để nắm main idea:

Hiểu câu hỏi: the forces of ____ might have caused the movement because there were many flags and banners on the bridge that day.

=> Đáp án là danh từ (sau 'of') - lực của cái này đã gây ra chuyển động của cầu

Phân tích info:

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6
swaying
Mở rộng

Giải thích chi tiết



Hai từ 'floor' 'surface' khá quen thuộc nên không khó để ta tìm thấy cụm paraphrase của 'walk on swaying floors' trong bài

=> Tới đây ta có thể điền luôn đáp án, hoặc có thể phân tích thông tin để confirm đáp án nè





Áp dụng Linearthinking để nắm main idea:

 If we walk on a swaying surface we tend to compensate and stabilise ourselves by spreading our legs further apart but this increases the lateral push 

Xem full giải thích
7
further apart
Mở rộng

Giải thích chi tiết



Câu này chủ yếu để nói rõ hơn về 'new understandings' ở câu trước, thông tin được khoanh vùng không thay đổi



Áp dụng Linearthinking để nắm main idea:

Hiểu câu hỏi: people would place their leg _____ to keep balance when the floor is shaking 

=> Đáp án chỉ có thể là trạng từ - trạng thái của chân khi một người muốn giữ thăng bằng

Phân tích info: we tend to compensate and stabilise ourselves by spreading our legs further apart

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8
footsteps
Mở rộng

Giải thích chi tiết



Dựa vào tên riêng Pat Dallard, ta có thể dễ dàng khoanh vùng được thông tin



Ta chỉ cần đọc cấu trúc cùng Linearthinking thôi là có thể suy ra được đáp án rồi:

Câu hỏi: pedestrians may unknowingly adjust their _____ to match the sway of the bridge

Bài đọc: It is an tendency for pedestrians to match their footsteps to the sway

=> unknowingly = unconsciously

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9
horizontal forces
Mở rộng

Giải thích chi tiết



Dựa vào tên riêng của giáo sư Fujjino Yozo, ta nhanh chóng khoanh vùng được thông tin

Câu hỏi cơ bản chỉ paraphrase lại thông tin trong bài theo dạng câu bị động, ta so sánh cấu trúc 2 câu với Linearthinking nhé

Câu hỏi: vibration of a bridge could be caused by the ________ of people walking, running and jumping 

Bài đọc: horizontal forces caused by walking, running or jumping could also cause excessive dynamic vibration in the bridge

=> A could cause B = B could be caused by A

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10
upright
Mở rộng

Giải thích chi tiết



Áp dụng Linearthinking để nắm main idea:

Hiểu câu hỏi: because the lateral rhythm of the sway could make pedestrians adjust their walk and reach the same step until it is impossible to stand ______

=> Đáp án là trạng từ - bổ nghĩa cho động từ stand

=> Pedestrians điều chỉnh các bước đi và dần bước đi đều nhau cho đến khi không thể đứng như thế nào nữa

Phân tích info:

Xem full giải thích
11
Arup
Mở rộng

Giải thích chi tiết



Áp dụng đọc connection với Linearthinking

 1 In order to design a method of reducing the movements , an immediate research program was launched by the bridge’s engineering designer Arup .

 2 It was decided that the force exerted by the pedestrians had to be quantified

 3 Although there are some descriptions of this phenomenon in existing literature , none of these  actually quantifies the force 

 4 So  there was no quantitative analytical way to design the bridge against this effect.

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12
Imperial College
Mở rộng

Giải thích chi tiết



Ta dễ dàng nhận ra vấn đề 'Not long enough' thuộc về 'Imperial College' qua cụm 'too short'

=> Answer: Imperial College



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13
University of Southampton
Mở rộng

Giải thích chi tiết



Áp dụng đọc connection với Linearthinking để nắm main idea:

 1 The tests at the University of Southampton involved a person walking on the spot on a small shake table.

=> Giới thiệu về dự án của University of Southampton - với đặc điểm là 'a person walking on the spot'

 2 Giới thiệu về dự án của Imperial College

 3 + 4 : Chỉ ra hạn chế của 2 dự án - với dự án của Southampton được gọi là 'the "walking on the spot" test'

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