- •Министерство образования Республики Беларусь белорусский национальный технический университет
- •Мосты. Тоннели
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the questions:
- •III. What definition of a bridge is correct?
- •IV. Make the collocations with the word bridge using the words in ovals and put them into the sentences below. With the rest not used make your own sentences:
- •V. Make the following sentences shorter replacing a set of words with one:
- •VI. Choose the following role and make a small report covering the problem mentioned:
- •I. What can it be?
- •II. Decide whether the following statements are true or false according to the text:
- •III. Answer the following questions:
- •IV. Match the meanings of these terms with their definition:
- •V. Match the period with the description:
- •VI. Can you decipher the message?
- •VII. Make the word combinations using the derivatives from the words in brackets:
- •VIII. Find the synonyms to the words in italics:
- •IX. Find key-words in the text to give general information about the history of bridge construction. How many of them do you need?
- •X. Make a short summary of the text.
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the following questions:
- •I. Answer the following questions:
- •II. Match the meanings of these terms with their definition:
- •III. Put the words in correct forms into the text:
- •IV. Read the following text to find information on:
- •V. Now you are ready to describe bridges of the Middle Ages and the Renaissance
- •VI. Continue completing the table:
- •I. Answer the following questions:
- •II. Match the meanings of these terms with their definition:
- •III. Choose the correct preposition:
- •IV. Put the correct form of the words into the sentences:
- •VI. Continue completing the table:
- •1. The history of bridge construction
- •2. The history of bridge construction in Belarus
- •I. Decide whether the following statements are true or false according to the text:
- •III. Match the meanings of these terms with their definition:
- •IV. Match the words with their synonyms:
- •V. Fill in the correct prepositions:
- •VI. Read the sentences and translate the words in brackets:
- •VII. Make the precis of the text
- •Introduction
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the following questions:
- •III. Choose the contextual meaning of the word:
- •V. Fill in the correct prepositions:
- •VII. Make the precis of the text
- •I. Decide whether the following statements are true or false according to the text.
- •II. Answer the following questions:
- •III Match the meanings of these terms with their definition:
- •IV. Match the word with its translation. Find the corresponding pairs of words:
- •V. Read the passage and answer the question:
- •VI. Fill in the missing words from the list:
- •VII. Make the precis of the text
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the questions:
- •III. Match the meanings of these terms with their definition:
- •IV. Translate:
- •V Insert the words from the list:
- •VI. Make the precis of the text
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the questions:
- •III. Insert the words from the list:
- •IV. Fill the correct preposition:
- •V. Fill in the gaps with a suitable derivations of the word given on the right:
- •VI. Read the passage and answer the question: How has the classical drawbridge been improved?
- •VII. Make the precis of the text
- •I. Decide whether the following statements are true or false according to the text:
- •II. Complete the sentences with the best answer:
- •III. Answer the questions:
- •IV. Match these terms with their definitions
- •V. Translate the missing words
- •VI. Insert the words
- •IV. Match the word with the corresponding number:
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the questions
- •VII. Make the precis of the text
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the questions:
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the questions
- •III. Complete the sentence with the best answer (a, b or c) according to the information in the text
- •IV. Put the words in the right order
- •V. Fill in the correct prepositions
- •VI. Translate the passage and answer the question: What was done to facilitate the setting of a foundation.
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the questions:
- •III. Insert the words from the list
- •IV. Translate the words in brackets.
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the questions
- •III. Match the meaning of the terms with their definition.
- •IV. Insert the words and translate the sentences.
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the questions.
- •III. Match the meaning of the terms with their definitions.
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the following questions:
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the following questions:
- •III. Match the meanings of these terms with their definition:
- •IV. Complete the table with the missing words:
- •V. Say in other words (use synonyms or terms instead of words and word-combinations in italics):
- •VI. Write down the key-words from the text.
- •VII. Get ready to speak on the Sunshine Skyway Bridge.
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the following questions:
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the following questions:
- •III. You’ve read about two most famous suspension bridges in the world. Can you compare them? Complete the following table:
- •IV. Match the meanings of these terms with their definition:
- •V. Put the words in the right order to make a statement:
- •VI. Read the text below and decide which answer a, b, c, or d best fits each space. Circle your answer.
- •1. Work with a partner to discuss the following questions and choose answers.
- •2. Now read the text about Tower Bridge to see whether you are right.
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the following questions:
- •I. Answer the following questions:
- •II. Match the meanings of these terms with their definition:
- •III. Fill in the correct prepositions:
- •IV. Say in other words:
- •V. Reconstruct the following texts and title them:
- •VI. Have you ever seen the bridges described in the photos?
- •VII. How are the following names and things connected to Tower Bridge? Say some words about each of them.
- •VI. Make the plan of the text Tower Bridge.
- •VII. Write down the key-words to expand the plan.
- •VII. Make an abstract of the same text.
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the following questions:
- •III. Complete the sentences:
- •IV. Make the collocations and make up the sentences with them:
- •V. Fill in the correct prepositions:
- •VI. Say in other words (if very complicated, use the words after the text):
- •VII. Complete the text with suitable letters or words:
- •1. Famous bridges.
- •2. Famous bridges in Belarus.
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the questions.
- •III. Match the words with their synonyms
- •IV. Match the words with their opposites
- •V. Insert the prepositions
- •VI. Insert the words from the list
- •VII. Make the precis of the text.
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the questions
- •IV. Match the words with their opposites
- •V. Fill in the prepositions.
- •VI. Insert the words from the list
- •VII. Make the precis of the text
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the questions.
- •III. Match the words with their synonyms.
- •IV. Match the words with their opposites.
- •V. Fill in the prepositions.
- •VI. Insert the words from the list.
- •1. The history of tunneling.
- •2. The history of tunneling in Belarus.
- •1. Decide whether the following statements are true or false according to the text:
- •2. Answer the questions:
- •III. Insert the words from the list
- •IV. Fill in the prepositions:
- •V. Complete the sentences using appropriate derivates of the words given on the right.
- •VII. Make the precis of the text
- •1. Decide whether the following statements are true or false according to the text:
- •II. Answer the questions:
- •III. Insert the words from the list
- •IV. Fill in the gaps with suitable derivatives of the words given on the right:
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the questions
- •III. Fill in the prepositions.
- •IV. Fill in the words.
- •V. Give the missing forms of the words below.
- •Verb Noun Adjective
- •I. Decide whether the following statements are true or false according to the text.
- •II. Answer the following questions.
- •I. Match the words with their synonyms.
- •II. Match the words with their opposites.
- •III. Fill in the words: feet, shallow, circular, mining, steel, conditions, waterproofed, cost, dangerous, downward.
- •1. Basic procedures in tunneling operations.
- •2. The construction of tunnels.
- •I. Decide whether the following statements are true or false according to the text:
- •II. Answer the following questions:
- •III. Match the meanings of these terms with their definition:
- •IV. Complete the following table:
- •V. Using the words from the table above complete the following sentences:
- •VI. Make up the sentences from the words below:
- •VI. Complete the text with the words below:
- •VII. What plan of the text The Mersey Tunnel is better? Why?
- •I. Using the words in the box complete the following table:
- •II. Decide whether the following statements are true or false according to the text:
- •III. Answer the following questions:
- •IV. Arrange the following statements in right order:
- •V. Choose the right variant:
- •VI. Convert the following units of length into the units accepted in Belarus:
- •VII. Complete the following table and analyze it
- •VIII. Match the meanings of these terms with their definition:
- •IX. Complete the text using the words below:
- •X. Put correct forms into the gaps in the text:
- •X. Make a précis of the text Central Artery/Tunnel Project (Big Dig)
- •I. Decide whether the following statements are true or false according to the text:
- •II. Using the information given in the text complete the following table:
- •III. Answer the following questions:
- •IV. Fill in the correct prepositions and match the collocations:
- •V. Say in other words:
- •VI. Guess the words in the text:
- •VII. Read the text above once again and choose the sentence summarizing it:
- •I. Arrange the parts of the text according to the following plan:
- •II. Read the next part of the text and choose the title below the text summarizing it:
- •III. Make the precis of the text Seikan Tunnel
- •1. Famous tunnels in the world
- •2. Famous tunnels in Belarus.
1. The history of bridge construction
2. The history of bridge construction in Belarus
Unit 2: KINDS OF BRIDGES
Lead in
What parts does a bridge consist of?
How do bridges differ?
Find the following terms and memorize their meaning.
truss bridge suspension bridge cable stayed bridge girder bridge reinforced framework roadway deck truss bridge through truss bridge cantilever bridge stiffening girder radiating pattern fan pattern star pattern viaduct aqueduct |
spandrel columns tied arch bridge continuous truss bridge simple span truss bridge anchor arm cantilever arm suspended span side span anchorage cable main cable suspension cable bascule bridge swing bridge vertical lift bridge |
Text 1. BASIC FORMS
There are six basic bridge forms: the beam, the truss, the arch, the suspension, the cantilever, and the cable-stay. Figure 11 illustrates these forms and indicates the way loads are carried by showing the approximate location of compression (where material is squeezed together) and tension (where material is stretched).
Beam. The beam bridge is the most common bridge form. A beam carries vertical loads by bending. As the beam bridge bends, it undergoes horizontal compression on the top. At the same time, the bottom of the beam is subjected to horizontal tension. The supports carry the loads from the beam by compression vertically to the foundations.
When a bridge is made up of beams spanning between only two supports, it is called a simply supported beam bridge. If two or more beams are joined rigidly together over supports, the bridge becomes continuous.
Truss. A single-span truss bridge is like a simply supported beam because it carries vertical loads by bending. Bending leads to compression in the top chords (or horizontal members), tension in the bottom chords, and either tension or compression in the vertical and diagonal members, depending on their orientation. Trusses are popular because they use a relatively small amount of material to carry relatively large loads.
Arch. The arch bridge carries loads primarily by compression, which exerts on the foundation both vertical and horizontal forces. Arch foundations must therefore prevent both vertical settling and horizontal sliding. In spite of the more complicated foundation design, the structure itself normally requires less material than a beam bridge of the same span.
Suspension. A suspension bridge carries vertical loads through curved cables in tension. These loads are transferred both to the towers, which carry them by vertical compression to the ground, and to the anchorages, which must resist the inward and sometimes vertical pull of the cables. The suspension bridge can be viewed as an upside-down arch in tension with only the towers in compression. Because the deck is hung in the air, care must be taken to ensure that it does not move excessively under loading. The deck therefore must be either heavy or stiff or both.
Cantilever. A beam is said to be cantilevered when it projects outward, supported only at one end. A cantilever bridge is generally made with three spans, of which the outer spans are both anchored down at the shore and cantilever out over the channel to be crossed. The central span rests on the cantilevered arms extending from the outer spans; it carries vertical loads like in the supported beam or a truss -that is, by tension forces in the lower chords and compression in the upper chords. The cantilevers carry their loads by tension in the upper chords and compression in the lower ones. Inner towers carry those forces by compression to the foundation, and outer towers carry the forces by tension to the far foundations.
Cable-stay. Cable-stayed bridges carry the vertical main-span loads by nearly straight diagonal cables in tension. The towers transfer the cable forces to the foundations through vertical compression. The tensile forces in the cables also put the deck into horizontal compression.
COMPREHENSION CHECK