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  • On the coefficient of prismatic strength of high-strength concrete

    This article provides an account tsentrenno and eccentrically compressed reinforced concrete columns of high-strength concrete on the deformed pattern in SP 63.13330.2012. Compares the results of the calculation of the bearing capacity of the columns with the set experimental data. Proposed adjustments in the form of the coefficients in the formulas for the curvature tsentrenno compressed columns j and eccentrically compressed yb.

    Keywords: high-strength concrete, physical experiment, prism strength, lateral reinforcement, concrete counters, deformation correction factor

  • Quality management system creation in construction in the conditions of self-regulation

    Questions of improvement of the organizational mechanism of interaction of participants of construction are considered. In the conditions of weakening of state regulation, self-regulation with its collective joint liability of members of SRO has to become one of the main regulators of activity in the monitoring system of quality of construction. Ensuring integration of local systems of quality management of participants of construction has to be carried out on the basis of the regulations including requirements to system of document flow, to procedures of transfer, acceptance and modification of the design and estimate documentation, structure of executive documentation, an order of survey of the hidden works, requirements to information interfaces between local IT.

    Keywords: Self-regulation, the organizational mechanism, quality management system in construction

  • The strength and deformability of strengthened beams with different varied factors

    Some information was provided about the influence of type and percent of steel and composite reinforcement, on the strength and deformability in strengthened reinforced concrete beams. It was found, that the increment degree of strength in beams decreases by the increasing in percentage of steel reinforcement, especially, when a carbon fiber plastics with hot and cold hardening was used.

    Keywords: Concrete, reinforced concrete, steel, composite, the reinforcement rate, the efficiency of strengthening , the varied factors, strength, limit strength, maximum allowable deflection, deformation.

  • The influence of steel and composite reinforcement on the width of the normal cracks

    An analysis for the influence, of type and quantity of steel and composite reinforcement, on the normal cracks development, at different load levels, and by the maximum allowable deflection in beams. It was Found that throughout the load range, the reference beams are most cracked. The reduction degree in crack width depends on the strength and percentage of the steel reinforcement.

    Keywords: concrete, reinforced concrete, steel, fiberglass, carbon fiber, laminate, maximum allowable crack width, load level, the development of cracks, the relative width

  • the dependence of the column’s relatively carrying capacity on the relatively eccentricity

    "The results of the computational experiment, Show, that the dependence of the relatively carrying capacity on the relatively eccentricity is almost independent on the reinforcement Ratio or on and concrete type. "

    Keywords: High- Strong concrete, self-compacting concrete, modulus of elasticity, column.