CALCULATION OF RELIABILITYOF THE REINFORCED CONCRETE BEAM WITH THE NORMAL CRACK IN THE STRETCHED CONCRETE ZONE BY CRITERION OF ITS LENGTH

Stroitel’stvo: Nauka i Obrazovanie

V.S. Utkin¹  K.A. Karpushova¹ 

[1] VSTU;

关键词: steel concrete beam;    normal crack;    reliability calculation;    crack length;    safety of operation;    failure;    reliability interval;    random variable;   

DOI  :  

来源: DOAJ

【 摘 要 】

In work the problem of calculation of reliability of a reinforced concrete beam with a single crack, normal to a beam axis, by criterion of its length is considered. In norms, for example, in the joint venture 63.13330.2012, etc. calculation of a reinforced concrete beam for reliability isn't regulated by GOST 27751-2014 on crack length in the stretched beam concrete zone, however with development of rather new science — “mechanics of destruction” of an indicator of quality of a construction object in the form of durability succeed the energy spent for destruction of structure of material of a beam; critical length of a crack; critical coefficient of intensity of tension of concrete and reinforced concrete. For practical application of calculations of reliability at a stage of operation of a reinforced concrete beam the criterion in the form of the critical length of a crack in the stretched concrete zone is the most acceptable now. In this regard along with the considered methods of calculations of a reinforced concrete beam by criterion the method of calculation of reliability of a reinforced concrete beam by criterion of length of a crack is offered to the first and second groups of limit states. This method of calculation of reliability most we realize in practice under operating conditions beams, though it isn't deprived of some difficulties connected taking into account additional increase in visible length of a crack at the expense of the site in crack top with partially loosened concrete. Work is of interest to employees of service of operation of reinforced concrete designs and beams, in particular. The algorithm of calculation of reliability of a reinforced concrete beam is presented in the given examples.

【 授权许可】

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