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О влиянии рабочей арматуры железобетонных плит на их сопротивление продавливанию

О влиянии рабочей арматуры железобетонных плит на их сопротивление продавливанию

Abstract

The paper presents experimental research results and their analysis in respect of flat reinforced concrete slabs resting on point supports or soil in case of concentrated punching force. However the conducted researches have shown a number of incompatibilities accepted in computational model standards that appear in the form of critical parameters in the punching zone and configuration of computational (critical) sections in comparison with an actual pattern of slab crack formation and their collapse in the places of concentrated force application. Moreover, the computational methods do not take into account at all an influence of longitudinal reinforcement on both principal axis of the building frame or take it into account this phenomenon by empirical dependence indirectly. In view of the above-mentioned facts an accumulation of new experimental data is considered as an expedient process with the purpose to identify a physical pattern of flat reinforced concrete slabs operation under concentrated punching force. The paper makes it possible to revise a calculative methodology and, preserving a high reliability, it also permits to improve efficiency of a floor construction of the whole framework. It has been determined that longitudinal reinforcement of reinforced concrete slabs is actively involved in their work under concentrated punching force and exerts a prominent influence on their resistance to punching force. The paper presents a possible approach pertaining to evaluation of a longitudinal reinforcement influence on resistance of reinforced concrete slabs to punching force with due account of regulations of the appropriate standardized documents.

Представлены результаты экспериментальных исследований плоских железобетонных плит, опертых на точечные опоры или на грунт, при действии сосредоточенного продавливающего усилия и выполнен анализ результатов испытаний. Однако проведенные исследования показали ряд несоответствий, принятых в нормах расчетных моделей, выражающихся формой критических параметров зоны продавливания и конфигурацией расчетных (критических) сечений фактическим картинам трещинообразования в плитах и разрушения их в местах приложения сосредоточенных усилий. Кроме того, расчетными методами либо вовсе не учитывается влияние продольной по обеим главным осям каркаса здания рабочей арматуры плит, либо учитывается опосредованно эмпирическими зависимостями. С учетом сказанного накопление новых экспериментальных данных с целью выявления физической картины работы плоских железобетонных плит под действием сосредоточенного продавливающего усилия является целесообразным. Это позволит уточнить расчетную методику, а также, сохранив высокую надежность, повысить эффективность конструкции перекрытий всего каркаса. Установлено, что продольная рабочая арматура железобетонных плит активно включается в их работу при продавливании сосредоточенным усилием и оказывает заметное влияние на их сопротивление этому воздействию. Представлен возможный подход к оценке влияния продольной арматуры на сопротивление железобетонных плит продавливающему усилию с учетом положений нормативных документов.

Keywords

ВЛИЯНИЕ РАБОЧЕЙ АРМАТУРЫ,ЖЕЛЕЗОБЕТОННЫЕ ПЛИТЫ,СОПРОТИВЛЕНИЕ ПРОДАВЛИВАНИЮ

  • BIP!
    Impact byBIP!
    selected citations
    These citations are derived from selected sources.
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    0
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold