Методика проектування конструкцій каркасу будівель з ЛСТК

Abstract

UK:Наведено методику раціонального проектування конструкцій каркасу з ЛСТК з урахуванням їх взаємодії з обшивкою. Враховані особливості визначення несучої здатності елементів каркасу, що розкріплені листами малої жорсткості через податливі з’єднання, та оцінки НДС утвореної такими елементами системи діафрагм, що забезпечують просторову жорсткість будівлі.

EN: Framings from lightweight steel thin–wall constructions (LSTC) are used for erection of low–rise buildings and superstructures in many cases. In such building structures based on the LSTC framing (walls and floors) are used low rigidity sheathings (OSB, gypsum board, etc), which increase their carring ability and spatial rigidity.

At the same time, due to spring stiffness of frame–sheathing connections, building codes restrict an opportunity of sheathing work accounting and, as a consequence, more efficient use of element cross–sections. In addition, enough challenge is accounting of considered building elements interaction for estimation of their spatial rigidity.

Investigation of the features of “framing–spring stiffness connections– sheathing” system, where the sheathing carries out two structural functions: frame elements bracing (reduction of effective length and exception of certain form buckling) and to ensure the rigidity of structures (walls, floors) and the frame as a whole, will allow to form the technique of rational design of the LSTC framing building.

The purpose of this work is to obtain a general algorithm of rational design of LSTC framing constructions in view of their interaction with low rigidity sheathing, using presented in the available sources and received in own work data.

The main task of rational design technique is to reduce the cost of building frame. It includes the following steps:

1) development of space–planning decisions (considering the possibility of adjustments to reduce the cost of construction);

2) assignment of frame element parameters (single element constructive decisions, their connections);

3) calculation of frame structural elements (accounting sheathing work);

4) estimation of the accepted frame structure rigidity under the lateral forces; adjustment constructive or space–planning decisions at default of frame rigidity conditions;

5) estimation of building frame cost based on the accepted space–planning and constructive decision;

6) variation of the space–planning and constructive solution parameters in possible margines; reassessment of the cost;

7) comparison of costs; adoption of space–planning and design solution with minimal costs for erection of the building.

Calculation of frame structural elements and estimation of LSTC building frame spatial rigidity are carried out with accounting of their interaction with a low rigidity sheathing.