The innovative scheme
and new engineering solutions
allow to ensure the stability
of the building,
without increasing capital cost

The applied technology

The provision of human security and the preservation of infrastructure, buildings and facilities are the objectives which our engineers are working to accomplish. Our specialists have experience with designing and constructing buildings and structures of various types, from residential houses and industrial buildings to sport facilities, including stadiums and infrastructure, primarily airports, roads and bridges.

The design of buildings, using the technical
solutions envisaged in the patents
of Ukraine No. 99847 and 110298,

  • allows to perceive seismic loads of low intensity almost without damage,
  • seismic effects of moderate intensity with a limited level of damage which allows economic viability and the possibility of restoration,
  • seismic effects of high intensity with the collapse prevention, i.e., complete destruction of a structure.
  • 1 |spatial pillar with smooth butt-end parts;
  • 2 |precast plate of a beamless floor

The beamless option of a structural system:

Basic elements in the new structural system, which transmit the vertical loadings on subjacent floors, are spatial pillars with the cross, T, or corner shape of cross-section.

At the same time, spatial pillars provide the function of diaphragms - perceiving the horizontal loadings.

The pillar sizes are determined on the analysis basis so that the resultant longitudinal force (N) with any load combination except for a seismic one (middle and high intensity) is kept inside the core of section. Thus the trapezoid (triangular) epure of compression stress is realized in the cross-section

The beamless option of a structural system:

Wresistance moment,

Farea of pillar cross-section

Construction of the joint with horizontal displacement limit elements
  • 1 |spacial pillar
  • 2 |floor slab
  • 3 |elastic gasket
  • 4 |steel rubbered bar

Under these conditions, the horizontal joints of spatial pillars can be executed without connection of longitudinal reinforcement, and the longitudinal reinforcement is usually minimal.

Horizontal forces in the joints are usually perceived by forces of friction. The keys can be arranged if necessary. Such a construction allows free mutual moving of pillars in a vertical direction at their turn, but limits horizontal mutual displacements.

Under seismic effects of low intensity, the bearing structure of the building operates rigidly as a monolithic structure, ensuring both strength and a desired level of comfort under the wind load, unlike the seismic system based on metal-rubber supports which are less rigid and may allow displacement under the wind loads, causing discomfort.

Under seismic effects of medium and high intensity, the structure of the building works as a sustainable mechanism with a very high energy dissipation rate.

The essence of the earthquake defence system of buildings SC, based on patent UA№110298, is to create a structural system using constructions and joints which may redirect a portion of seismic energy to overcome gravitation forces.

The deformed schemes of structural systems:
  • a |for the system
    with continuous vertical structures;
  • b |for the system
    with free bed joints between levels

In free bed joints under the action of horizontal inertia forces of seismic effect, the implementation of different stress states is possible. If horizontal inertia forces are small and comparable to wind loads, the joints remain closed throughout the area.

With increased horizontal inertia forces, when the eccentricity of the resultant longitudinal force is outside the core section, the joints get partially disclosed. Thus, there is a turn of pillars around the extreme points, accompanied by the rise of their gravity centers. Upon termination of horizontal inertia forces, gravity forces return the structure into its initial position.

The motion of buildings under seismic influence is accompanied by the periodic conversion of kinetic energy of the moving masses into potential energy. In conventional systems with elastic material and unbroken vertical elements, kinetic energy is converted into potential energy of the stress state with a possible energy accumulation, the greater, the closer are the periods of seismic impact and the system natural periods of oscillation.

In systems with spatial pillars and free bed joints under seismic loads of medium and high intensity, kinetic energy is converted not only to the potential energy of the stress state, but to the potential energy of position due to the rise of the structure gravity centers.

Thus, the component of the potential energy determined by elastic deformation of the elements significantly reduces, while the gravity component increases. When you change the size and/or direction of the inertia forces of the seismic impact, gravity forces return the structure into its initial state, while the seismic energy is dissipated.

Analysis on non-stationary dynamic influences by the LIRA software provides information about changes in kinetic energy, which indicates that the amount of accumulated energy in the systems with free bed joints can be substantially (by several orders) lower, than that in the systems without bed joints.

The benefits of a structural system
with spatial pillars and free bed joints under seismic effects

  • 1 |A structural system does not require the use of additional, usually expensive, construction elements and joints (dampers, insulators, etc).
  • 2 |The amount of seismic energy, which can be converted into other types of energy with subsequent dissipation, is much higher than that in the known designs because the process involves the mass of the whole building.
  • 3 |The force of gravitation, which acts continuously and costs nothing, contributes to absorption and subsequent dissipation of seismic energy.
  • 4 |A structural system is not sensitive to frequency description of seismic influence.
  • 5 |After the end of seismic influence, a structural system returns to its initial state. High maintenance after seismic influences.
  • 6 |The majority of precast concrete elements are manufactured at existing plants.
  • 7 |Minimization of wet and welding processes allows assembling buildings from prefabricated reinforced concrete all year round.
  • 8 |Extensive use of hollow core slabs saves materials, simplifies the design of the building and reduces construction costs.
  • 9 |Relative consumption of basic materials per m2 of the total area amounts to concrete 0.3 m3 and metal 20 kg.

Intellectual elaboration is confirmed by several patents. Our development of the innovative constructive scheme of constructing buildings and facilities, which is safe and effective, is a fundamentally new technology. The system is based on the construction of a nonlinear system with horizontal joints, which is constructed on a modular principle, with each module being a firm unit.