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.
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:
W – resistance moment,
F – area of pillar cross-section
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.
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.
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.