What are the main contents and formulas for the groove test?

1. Reliability of building structure engineering: safety, applicability, durability - formula: Shi Naian.

2. Disadvantages of concrete structure: heavy weight, poor crack resistance, complex construction, and long construction period - Tip: Large intestine is complex.

3. The main factors that affect the bonding strength between steel bars and concrete: the strength of the concrete, the thickness of the protective layer, and the net distance between the steel bars - formula: swaddling towel.

4. Simultaneous failure of the upper and lower beams is the appropriate reinforcement failure. There are three stages: concrete cracking in the tension zone → steel bar reaching yield strength → crushing of concrete in the pressure zone - formula: pull and compress.

5. The main factors that affect the compressive strength of masonry: the strength grade of the bricks, the strength grade and thickness of the mortar, the quality of the masonry (fullness, the moisture content of the bricks during masonry, and the skill of the operator) Level) - Tip: What to drill for.

6. Factors affecting the height-to-thickness ratio of masonry walls: mortar strength, component type, masonry type, support constraints, section form, wall openings, load-bearing and non-load-bearing - formula: Kill seven dogs and use the wall to call them.

7. The verification of masonry walls as pressure-bearing components is divided into three aspects: stability; verification of the wall’s limit state bearing capacity; local stress of compression components at pressure-bearing parts such as beams and columns. Calculation of pressure bearing capacity - formula: Stabilize the city wall.