What is the first and second level seismic resistance of steel bars, and how many earthquakes are re

Rebar is a material and does not have a seismic rating.

Division. GB50011-20106 Code for Seismic Design of Buildings

strip "Reinforced concrete."

Houses should be subject to different seismic ratings according to the type of fortification, intensity, type of structure and height of the house, and should meet the requirements of the corresponding calculation and construction measures ,..

The seismic rating of the structure is divided into:

Levels 1, 2, 3, and 4. With the delineation of the seismic grade of the structure, it is convenient for the structural design.

The construction drawings are carried out using the specifications that specify different calculations and different basic seismic structural measures.

design; The specification table.

This seismic resistance does not refer to the steel bar, but the seismic resistance level set for the building during the structural design of the building.

Reinforced concrete structures are generally resistant to Class 5**.

If it is a reinforced concrete frame structure, then the seismic grade is usually divided into 1-4 grades, which means 4 grades, extremely serious, serious, more serious and general, at present, in the domestic construction field, this standard has been strictly implemented.

The seismic intensity indicates the degree of destruction of the building, which is related to many conditions in the area, and the judgment of the seismic intensity is mainly based on people's feelings, the vibration of the furniture and the degree of damage to the building, and even the ground damage.

The factors that affect the seismic intensity are mainly manifested in the level of **, the distance of the epicenter and the performance of the building, etc., in the same environment with other conditions, if the magnitude is higher, then the intensity will be correspondingly greater.

** Preventive emergency methods:

1. Fortification.

Determination of seismic fortification requirements: formulate zoning maps, carry out sub-divisions, carry out safety evaluations, design in accordance with seismic fortification requirements and seismic design specifications, and carry out construction in accordance with seismic design. To put it simply, it is to set up measures to prevent disasters during the construction of the project, involving the whole process from the planning and site selection of the project, the engineering design and construction to the completion and acceptance.

2. Earthquake-resistant site.

Choose a good building site, do not build a house on a site that is not conducive to earthquake resistance, and the site that is not conducive to earthquake resistance has active faults and its nearby areas; water-filled loose sand layer, weak silt layer, soft artificial fill layer; paleochannels, old ponds and river flats; Steep slopes and river ridges that are prone to cracking, subsidence and slippage; Slender and protruding mountain mouths, towering mountain packs, or terraces facing paddy fields on three sides.

3. Housing reinforcement.

In order to resist the sudden attack of **, we must always pay attention to the maintenance of old houses. If there are cracks or crooked flashes in the wall, they should be repaired in time; The earthen walls that are easy to weathered soda should be plastered regularly; Roof leaks should be repaired quickly; Immediately after heavy rain, remove the water around the house to avoid long-term soaking of the wall foundation. Wooden beams and columns should be prevented from decay and insect damage, and repaired in time if damaged.

If necessary, the house should be simply reinforced, and the specific method is the reinforcement of the wall. There are two types of walls, one is load-bearing and the other is non-load-bearing. The methods of reinforcement include brick removal and joint repair, steel bar reinforcement, and wall reinforcement. <>

The level of one level is high.

The seismic grade is determined by the design department in accordance with the relevant provisions of the state, according to the "Classification of Building Importance and Fortification Standards", according to the four factors of fortification category, structure type, intensity and house height, and the specific design is carried out without the same seismic grade. Taking reinforced concrete frame structures as an example, the seismic resistance is classified into Grade 1 to Grade 4 to indicate that it is very severe, severe, relatively serious and stool-like.