Abstract
The problem of calculating the local compressive strength of normal‐weight concrete elements of building and engineering structures locally loaded by rigid steel plates on a small area surrounded from all sides by a non‐loaded larger area of cross‐section is presented in this paper. The results of experimental and theoretical investigations show that this stress‐strain concentration problem is rather complicated. Therefore up to now for the determination of local compressive strength of concrete elements various calculation methods have been used. The author of this paper proposed an alternative method the algorithm of which is based on the results of statistical analysis of numerous experimental data, conclusions of adequate theoretical research and propositions of SNiP, Eurocode2 and other design codes. According to this calculation method, the design local compressive strength of concrete and concrete elements depends not only on magnitude of local load concentration but also on characteristics of mechanical properties of concrete ‐axial tensile and compressive strength and relative element height (ratio of element height with less line of its cross‐section) too. The results of comparative calculations showed that experimental research data better comply with the calculated ones by the proposed method than with the obtained ones by SNiP, SNB, STR and Eurocode2 methods.
Highlights
The problem of compression force action through rigid steel plates over a limited contact area of concrete surrounded from all sides by non-loaded larger area of cross-section is a frequent occurrence in normal-weight concrete elements of various building and engineering structures
Here Nsd design local compression force acting on the area Ac0 and determined at the specific class of loading situation [25]; FRdu design local compressive strength of concrete element; Ac0 loaded area of cross-section of element; Du coefficient to estimate the character of local load distribution on the area Ac0; fcud design local compressive strength of concrete
Here Zu coefficient to estimate the influence of concrete slenderness which shows how many times the design local compressive strength of concrete is larger than its design cylinder compressive strength fcd
Summary
The problem of compression force action through rigid steel plates over a limited contact area of concrete surrounded from all sides by non-loaded larger area of cross-section is a frequent occurrence in normal-weight concrete elements of various building and engineering structures (eg, steel base plates of steel and reinforced concrete columns and stanchions over footings or foundations, bearings in bridge structures, etc). In this case under local load on small area Ac0 (named as locally loaded area) the rised large local compression stresses very much depend on material layers in a larger area Ac1 design area of local load distribution. There is no unanimous opinion on the evaluation of design area of local load distribution Ac1
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