1. Representative values of gravity load include structural dead weight, live load, snow load, wind load, etc. These loads will change constantly during the use of the building, and various factors need to be considered comprehensively to determine their values. In the design of building structure, designers usually calculate and determine the representative value of gravity load according to different design stages and load combination methods.
2. The calculation of the representative value of gravity load needs to consider the type, height, span, material and other factors of the building, as well as external factors such as local climate conditions and earthquake intensity. When determining the representative value of gravity load, it is also necessary to consider the use function and purpose of buildings, such as the use characteristics and loads of different types of buildings such as office buildings, residential buildings and shopping malls.
3. In the structural design of buildings, the representative value of gravity load is one of the important parameters in structural design, which directly affects the safety and stability of buildings. If the representative value of gravity load is too small, the building may be damaged or collapsed due to insufficient bearing capacity; If the representative value of gravity load is too large, it will cause unnecessary waste and structural burden.
The concept of gravity
1, gravity is a physical phenomenon, which refers to the gravity of the earth to objects. On the earth, the gravity on an object is directly proportional to its mass and inversely proportional to the square of the distance between the object and the earth. This kind of gravity acts on an object and produces gravity. The magnitude of gravity can be expressed by weight, which is the magnitude of gravity on an object and equal to the gravity on the earth.
2. The direction of gravity is always vertical downward and perpendicular to the horizontal plane. On earth, gravity makes objects have weight and keep moving. The existence of gravity is related to the shape and rotation of the earth. The earth is an ellipsoid. Because of its rotation, the centrifugal force on the equator of the earth is greater than the poles, so the weight of the object on the equator is slightly less than the poles.
The unit of gravity is Newton. In the international system of units, the unit of gravity is kilogram force (kgf). In daily life, people often use units such as grams (g) or kilograms to describe the magnitude of gravity. The existence of gravity is one of the great phenomena in nature, which makes objects have weight and motion state, and also has a far-reaching impact on various biological and natural phenomena on the earth.