쉐도잉 연습: How Shear Deflection Impacts Deep and Composite Beams. - 영상으로 영어 말하기 배우기
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Welcome back to the channel.
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In today's video, we will be discussing the representation of frames by elements along the centerlines of their members,
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as well as the concept of shear deflection in beam deflection calculations.
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We will be exploring two specific examples, introducing a short, stiff horizontal member in a column connection
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and offsetting a smaller beam within the depth of a larger beam we will also be discussing composite frame analysis
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and the properties of composite sections transformed into equivalent steel sections
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finally we will delve into the effect of shear deflection on
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beam deflection including its importance in situations where beams are deep
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or in composite construction let's start by discussing the representation of frames by elements along the center lines of their members.
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Situations with discontinuities can arise as illustrated.
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One example is the introduction of a short, stiff horizontal member in the column connection, which may be rigidly connected,
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pinned at either end or centrally hinged.
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The choice of pin position affects the resulting bending moment's location and size, and it should be reflected in the connection design between the two sections.
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In many cases, designing the lower column for an additional bending moment
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and a nominally pinned connection from the upper column is appropriate.
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The second example involves the offset of a smaller beam within the depth of a larger beam.
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If the smaller beam remains within the larger beam's depth, it is not necessary to model the offset, provided that any actual loaves in the beams are small.
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Next, composite frame analysis.
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Composite frame analysis is typically done by considering a subframe,
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and the properties of composite sections must be transformed into an equivalent steel section.
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The redistribution of moments may depend on the method of analysis and section classification at the support.
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Figure 1 shows a suitable subframe for composite frame analysis,
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and figure 2 illustrates the relationship between composite section properties and steel section weight for initial analysis.
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Now let's talk about the concept of shear deflection, which occurs in addition to bending deflection as a result of shear strain in an element.
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The engineer's theory of bending commonly used to calculate deflections by hand ignores shear deflection.
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Neglecting shear deflection in beam deflection calculations is acceptable for non -composite beams of typical proportions used in conventional floors.
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However, in situations where beams are deep or in composite construction,
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shear deflection becomes a more significant proportion of the overall deflection.
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The deflection of castellated and cellular beams also includes a relatively large component due to the action of shear.
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If truss or virundial frames are modelled by beam elements in preparing scheme calculations,
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shear deflection must be included in deflection calculations because in this case it is a significant proportion of the total.
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Shear deflection will be taken into account in an analysis
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if the beam element used in modeling the structure is formulated to do so.
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The effect of shear deflection becomes more significant as beams become stocky or have a small span depth ratio.
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The following table shows the additional deflection due to shear as
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a percentage of the deflection due to bending for simply supported and cantilever eye section members.
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The contribution of shear deflection to the total deflection becomes important only in the case of stocky members
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and it is inversely proportional to the square of the span depth ratio.
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Plate girders typically have span depth ratios between 8 and 15,
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while span depth ratios for universal sections in building construction are around 20.
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At small span depth ratios, shear deflection may exceed deflection due to bending, but both are likely to be small.
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We hope you found this video informative and helpful.
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If you have any questions or comments, please leave them in the comments section below.
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Don't forget to hit the like button and subscribe to our channel for more informative videos.
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Thanks for watching, and we'll see you in the next one.
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영어 공부에 도움되는 건축 공학 영상, 어떻게 활용할까요?
오늘은 "How Shear Deflection Impacts Deep and Composite Beams"라는 영상을 통해 영어 회화 연습과 shadowing 실력을 키우는 방법을 알아보겠습니다. 이 영상은 건축 공학 관련 내용이지만, 전문 용어와 논리적인 구조가 잘 짜여져 있어 영상 영어 공부에 아주 좋은 자료입니다. 특히 복합 문장과 전문 용어의 발음을 연습하기에 적합해요.
영상에서 배울 수 있는 핵심 표현 5가지
- "shear deflection" (전단 변형): 영상에서 자주 등장하는 핵심 용어로, 발음은 /ʃɪr dɪˈflɛkʃən/입니다. "Shear deflection becomes significant in deep beams"와 같이 사용해요.
- "composite section" (복합 단면): "Composite sections are transformed into equivalent steel sections"와 같이 구조 공학에서 자주 쓰이는 표현이에요.
- "span depth ratio" (스팬-깊이 비): "Span depth ratio affects shear deflection"로 사용되며, 비율을 설명할 때 유용해요.
- "bending moment" (굽힘 모멘트): "The choice of pin position affects the bending moment"와 같이 힘의 작용을 설명할 때 필요한 용어예요.
- "redistribution of moments" (모멘트 재분배): "Redistribution of moments depends on the analysis method"로 구조 해석에서 중요한 개념을 나타내요.
이 영상을 활용한 shadowing 연습 가이드
이 영상은 전문 용어가 많아 shadow speech 연습에 조금 어려울 수 있지만, 단계별로 따라하면 쉽게 습득할 수 있어요. 먼저 영상을 0.75배 속도로 재생하며 발음과 억양을 주의깊게 듣고, 문장을 짧게 나눠 반복해서 따라해보세요. 특히 "composite frame analysis"와 같은 복합 단어의 발음을 명확히 하기 위해 입모양을 조정해보세요. IELTS 스피킹 준비에도 도움이 되는 논리적인 말하기 구조를 연습하기 위해, 영상의 내용을 요약해서 자신의 말로 표현해보는 것도 좋아요. 매일 10분씩 shadowing을坚持하면, 영어 듣기와 말하기 실력이 크게 향상될 거예요. 함께 힘내봐요!
쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법
쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.