Building
english
Advanced technology
MAINABOUT USEVENTSPORTFOLIOOUR CLIENTSVACANCIESCONTACTS
Presentations

Checking calculations

Calculation support Designing Аэродинамические расчеты Calculation of joints Equipment designing
 
Presentations

Checking calculations of cover structure in Odintsovo Volleyball Center

Problem statement

The purpose of this work is to perform checking calculations for specified loads and action on the cover structure of the Volleyball Center in Odintsovo.


Design data is necessary for analysis of strength, stability and spatial invariability of the system. Initial component of load is loading of the construction with its proper weight. For this purpose, weight of bearing elements, roof and suspended structures is also taken into consideration.

It is necessary to make calculations of stressedly-deformed state when the structure is loaded with permanent (proper weight) and superimposed loads. On the basis of design data, the analysis of forces and moments, acting in the bearing elements under specified loads, and local stresses, acting at connection points of bearing elements, is performed.

The cover of the Center is the system of cross girders from roll-formed welded closed sections.

General view of the structure

Connections of bearing elements in the joints are realized by two methods: edge lines of roll-formed welded sections are welded to the slabs, and these welded sections are joined together with high-strength bolts.

Node point with an element of bolted joint

The roof made from galvanized steel sheet with heat insulation is laid onto girders made from hot-rolled

channel bar.

Figure of girder attachment

Two finite element models of the structure cover with the use of different methods of bearing element modeling were developed:

1. In the beam model, the sections are modeled by one-dimensional bend elements with specified characteristics of beam sections. In beam modeling, it is impossible to realize a detailed elaboration of joints but this model is sufficient to determine forces and moments in the beams.

Fragment of beam finite element model of cover structure

2. The second finite element model is formed with the use of two-dimensional elements (SHELL elements). In this case, solid geometry of sections and structural features of connection points with account taken of thicknesses of all structural elements are modeled in sufficient detail. Such model makes it possible to analyze stressedly-deformed state of all joints in detail, find loss stability of structural elements and study the structure for progressive fracture.

Detailed finite element model from two-dimensional elements

Some results.

For both finite element models, calculations were made with loading of the structure by specified forces. Design loads were determined on the basis of data provided by the customer. Both geometric and physical nonlinearity was taken into consideration.

See also: Comparison of calculation results for beam finite element model of the structure and finite element model from two-dimensional elements

Deflections in the structure and stresses in its bearing elements were determined in the calculation for loading of both beam finite element model and detailed finite element model.
The calculations showed coincidence of deflections in the structure with accuracy of 2% and coincidence of respective stresses in the bearing beams with accuracy of less than 3%. This makes it possible to draw a conclusion on adequacy of the models: the beam finite element model and the finite element model from two-dimensional elements.

Beam finite element model. Deformed structure

Beam finite element model. Displacement distribution

Force factors acting in the beams were determined in the calculation for loading of the beam finite element model

Beam finite element model. Distribution of longitudinal forces

Beam finite element model. Distribution of maximum principal stress

Stresses and deformations in the places of section connections, frame joints, edge lines of roll-formed welded sections and other local places of the structure were determined in the calculation for loading of the detailed model.

Detailed finite element model from two-dimensional elements. Distribution of maximum principal stress

Distribution of stresses (von Mises). Local areas

Conclusions

Two finite element calculations were performed to analyze girder solid structure of the Voleyball Center cover. The first calculation was made with the use of a beam model of solid girder. This calculation made it possible to determine longitudinal and transverse forces, distribution of moments and stressed state in the beams with no account taken of complex structures of welded and assembled joints.
The second calculation was made with the use of a detailed model of all joints of the structure in order to analyze stressed state in local areas.

Thus, the performed linear and nonlinear calculations showed that in the large number of cases stresses in the joints of the system achieve its limit values with no account taken of weld stresses important for this structure and additional stresses arising during the manufacturing, erection and transportation, as well as with no regard to reliability coefficient (Loads and actions, SNiP 2.01.07-85*, Appendix 7*).

Erection of this structure finished with cracking in one of the pillars.

In view of the above, we consider that it is not possible to guarantee a long-term reliability of the structure.

Hexa Company to order of the State Unitary Enterprise of the Moscow Region, Mosoblstroyproject Design Institute, 2006

Rambler's Top100Rambler's Top100Рейтинг@Mail.ru