Swivel Joints of Transformable Net Shells Structures

The net shells have unlimited possibilities for creating new architectural forms. The growing number of buildings constructed using this technology indicates the prospects for the use of such structures, especially in harsh climatic conditions and remote areas. The design of reticulated shells is self-supporting and has higher bearing properties compared to other types of structures. This is due to the uniform distribution of loads on all the rods of the structure, which virtually eliminates brittle fracture. The aerodynamic shape of the reticulated shells provides the best wind flow compared to other structures, which makes them stable during destructive hurricanes and tornadoes. The authors set the task to calculate and design the connection swivel node of spatial rod constructions elements; the calculations were carried out in view of geometrical and physical nonlinearity. To that effect, the solid-state model of node was created and numerical simulation was carried out. The computer simulations of the net shells structures, the use of CAD software complexes for automation of activities on stages of design and technological preparation of production are allow to reduce the time of design development, improve the quality and reliability of the design and manufacture of elements.

Load Carrying Capacity of Steel Arch Reinforcement Taking into Account the Geometrical and Physical Nonlinearity

The paper deals with the calculation of the load carrying capacity of the steel arch reinforcements of underground and mine works with respect to the resulting large displacement and physical nonlinearities. Solution is based on the application of the so-called effective bending stiffness, which is defined as a function of the axial force and bending moment. The numerical model was verified using the values of the load carrying capacity, which have been experimentally obtained using strain-stress test, and implemented into the software that allows very effectively calculate load carrying capacity of steel arch reinforcements.