Steel quantity measurement standard for steel structure construction

Elevation shape: It refers to the regularity and uniformity of the vertical shape, that is, the degree of outlift or adduction, and whether the vertical stiffness is sudden, etc. If the lateral height of the steel structure building gradually changes uniformly from bottom to top, the amount of steel used will be less, otherwise it will increase, a typical high-rise building with vertical stiffness mutation set conversion layer.

Plane shape: If the rules of plane steel structure buildings and bump less steel quantity is less, the opposite is more, the greater the area of each layer of the same or similar and length of outer wall of the building, the more the amount of steel, flat shape whether rules not only determines the amount of steel, but also can measure the pros and cons of structural seismic performance, learn from this analysis of the savings by the steel structure seismic performance are not necessarily low.

Plane length dimension: that is, whether the structural unit is super long, when the building is longer, and the structure does not set up permanent joints, it becomes a super long building. Super long building because must consider concrete shrinkage stress and temperature stress, it is relative to non-super long building mainly treat is only the load of stress, its unit area with steel is obviously more.

Facade node: too complex facade node, such as facade lines, in the past are used to hang finished lines, for public buildings also use stone external hanging, but for residential projects, because of its high maintenance cost, now basically use reinforced concrete cast-in-place, will increase the amount of unilateral steel.

Location of lateral force resistant component: the stiffness center coincides with or is close to the mass center, or the location of lateral force resistant component can produce greater torsional stiffness, and the structure has small torsional effect, so the overall amount of steel used in the structure is less, and vice versa.

Column net size: including the absolute size of the column net and its density, it directly affects the structural layout of the floor beam and plate. Generally speaking, the floor with large column network uses more steel, while on the contrary, although it is less, but at the same time because of the increase of the number of columns, the column component uses more steel, in which the increase of the column end and the encrypted stirrup in the beam-to-column joint area accounts for almost 50% of the total increase. The size of the column net is uniform and consistent, which not only makes the structure (including column and beam) reasonable stress, but also saves the amount of steel used than the column net.

Underground structure: the basement height is too large, the basement wall reinforcement is bound to increase, the basement floor is also due to the increase of water pressure leads to the increase of concrete and steel consumption; The underground connections and underground grooves of mass buildings will also lead to an increase in the amount of concrete and reinforcement due to the slope discharge during the structural design.

Storey height: for high-rise buildings, it is difficult to determine a certain relationship between the storey height of steel structure buildings and the amount of steel used, in other words, it is not sure how much the impact of storey height on the amount of steel used. In terms of column stirrup, the total height of the same building, the height is smaller, that is, the number of layers is more, the reinforcement amount is more, but according to the amortization of the unit area after the amount of steel may be less. As for the cross-layer column, because of the complexity of the force and the larger section, the amount of steel is generally more than the normal height of the column.

Vertical aspect ratio: This is mainly for high-rise buildings, large aspect ratio of the building the structural overall stability is higher than wide than smaller buildings, in order to ensure the overall stability of the structure and control of lateral displacement of the structure, is bound to set up a strong resistance to lateral force component to improve the lateral stiffness of the structure, this kind of components in natural makes steel increases amount evenly, So that its unit area of steel with respect to the plane width than the adjacent building.

Plane length-width ratio: the plane length-width ratio of the building, regardless of whether it is too long, due to the two spindle direction of the dynamic characteristics are far from the same, under the action of horizontal force, the force of the two members of the uneven force and the increase of the torsion effect makes the reinforcement of the members increase.