1. This section follows the concept, function and classification of the structure. Only after learning this section can students understand the concepts of strength and stability in the third section.
2. The main contents of this section are: the structure of horizontal bar and the stress analysis in use; Structure and stress analysis of shed frame b.
3. The textbook starts with the simple structure and stress analysis of the horizontal bar that students are familiar with, and guides them into the more complicated structure and stress analysis of the frame beam.
Second, student analysis
After the first lesson, students learned the basic knowledge of structure, such as the concept, function and classification of structure. In addition, students have learned about mechanics in physics class, which has a certain foundation for the force analysis of objects. However, because force analysis is a difficult point in physics teaching, most students still have difficulty in force analysis. Therefore, in teaching, we should use models to demonstrate the deformation, and analyze and explain the force of the bar, the force of the column and the pull rod, the force of the frame and the balance of the bar.
Third, the teaching objectives
1. Through model demonstration, students can master the stress and deformation characteristics of the lever.
2. Understand the mechanical characteristics of frames, beams and arches.
3. Understand the reasons why frames, beams and arches are used in actual buildings.
4. Show some architectural pictures of frame, beam and arch structures to stimulate students' learning passion and interest.
Four, the focus and difficulty of teaching
Force analysis of each component of horizontal bar and force analysis of frame and beam. Force analysis of arch.
Verb (abbreviation of verb) teaching strategy
In the teaching process, teaching methods, students' reading methods, case analysis (model demonstration) and so on. ) and questioning method, let students flexibly discuss, analyze, communicate and interact with the difficult problems that need to be solved urgently in classroom teaching, and always run through the whole classroom teaching. Use multimedia teaching equipment to show students pictures related to teaching, so that students can reach a perceptual consensus as soon as possible. (within two class hours)
Teaching resources of intransitive verbs
Multimedia modern teaching equipment and horizontal bar model.
VII. Teaching Process (First Class)
serial number
course content
Teachers' activities
Student activities
1
Introduce a topic
Play a video of gymnasts exercising on the balance beam and horizontal bar. explain
Take a look and think.
2
Horizontal bar structure
Q: What are the components of the horizontal bar? Why do they match and arrange like this? Dominance: consider from two aspects: function and pressure. Q: What is the function of the horizontal bar?
Summarize related functions. It is pointed out that we will discuss this lesson from the perspective of structural stress.
Answer the first question after thinking, and think about the second question.
Answer about the function of bar.
three
Force analysis of horizontal bar
Model demonstration; Show pictures, etc. And lead students to analyze and understand the stress situation of each part of the bar from the perspective of deformation, and how to maintain the stability of the bar. Summarize the students' analysis.
Analyze the stress of the main members of the rod body. (Because students have learned the knowledge about mechanics in physics, they can analyze the force of each part of the bar) and moment (bending moment).
Record and organize relevant knowledge points
four
The concept of light beam
From gymnasts' movements on the balance beam
The concept of emergent beam
Students read "reading materials"
five
Mechanical characteristics of beam
Guide students to analyze the stress of balance beam (bench) and springboard.
Student analysis
Reflections on "Problem Thinking"
six
Summarize and assign homework.
"problem thinking"
record
Author: Li Jifu of Hainan No.2 Middle School