Abstract
The article presents a comparison of results of experimental and analytical calculations of the strength of the central and eccentrically compressed concrete elements working in the conditions of dynamic loads under fire exposure. The diagram shows a coefficient of dynamic strength depending on the dynamic loading under high temperature obtained by experimentation way. It is shown, that accounting the dynamic effects in fire condition reduces the load carrying capacity of columns by 40%. Therefore, it is recommended to check the possibility of progressive collapse of buildings and, results of which, appearing the character of dynamic loads on the structure, in calculating load carrying capacity of the structure in fire testing.
Highlights
Using the concept of a dynamic analysis of structures for fire resistance makes it possible to precise the valuation of resistance of buildings to the progressive collapse, survivability
The values of the coefficient of dynamic strength at different eccentricities and at different speeds of dynamic loading came after fire exposure (Table 3)
Static strength of reinforced concrete columns after fire exposure is reduced to 55%, coefficient of dynamic strength reaches 1.2 depending on the speed of dynamic loading in normal condition
Summary
Using the concept of a dynamic analysis of structures for fire resistance makes it possible to precise the valuation of resistance of buildings to the progressive collapse, survivability.In [1], it is presented a calculation of the fire resistance of the pylon of the 1st floor of 59-storey residential buildings in standard fire condition. As experimental studies devoted to the dynamic work of reinforced concrete elements operating in different temperature conditions were absent [2,3], the following experimental studies were performed by the authors. Reinforced concrete specimens were prepared and tested both under central compression and at different eccentricities: 3 cm, 3.5 cm, 4.0 cm.
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