Abstract
High-rise buildings have a specificity, which significantly distinguishes them from traditional buildings of high-rise and multi-storey buildings. Steel structures in high-rise buildings are advisable to be used in earthquake-proof regions, since steel, due to its plasticity, provides damping of the kinetic energy of seismic impacts. These aspects should be taken into account when choosing a structural scheme of a high-rise building and designing load-bearing structures. Currently, modern regulatory documents do not quantify the reliability of structures. Although the problem of assigning an optimal level of reliability has existed for a long time. The article shows the possibility of designing metal structures of high-rise buildings with specified reliability. Currently, modern regulatory documents do not quantify the reliability of high-rise buildings. Although the problem of assigning an optimal level of reliability has existed for a long time. It is proposed to establish the value of reliability 0.99865 (3σ) for constructions of buildings and structures of a normal level of responsibility in calculations for the first group of limiting states. For increased (construction of high-rise buildings) and reduced levels of responsibility for the provision of load-bearing capacity, it is proposed to assign respectively 0.99997 (4σ) and 0.97725 (2σ). The coefficients of the use of the cross section of a metal beam for different levels of security are given.
Highlights
High-rise buildings have a specificity, which significantly distinguishes them from traditional buildings of high-rise and multi-storey buildings
Careful and correct selection of construction materials, which excludes separate operation of structural elements and ensures homogeneity of physical and mechanical characteristics. These aspects should be taken into account when choosing a structural scheme of a highrise building and designing load-bearing structures
Today in buildings with a height of more than 300 m, including "ultra-high" buildings, steel structures are used for bearing elements
Summary
High-rise buildings have a specificity, which significantly distinguishes them from traditional buildings of high-rise and multi-storey buildings. Bearing structures of high-rise buildings in the initial period of development of this type of construction were mainly made of steel. Today in buildings with a height of more than 300 m, including "ultra-high" buildings, steel structures are used for bearing elements. Of factory installation elements on the construction site is carried out with the help of bolted connections, which allows to increase the accuracy of installation by eliminating warpage of steel structures under the influence of high temperatures. Steel structures are advisable to be used in seismic resistant regions, since steel, due to its plasticity, provides damping of the kinetic energy of seismic impacts. Steel structures require mandatory reliable protection against fire, since at 300° C the strength of steel is sharply reduced [1,2,3,4,5,6,7,8,9,10,11,12,13]
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