Design method of steel fiber recycled concrete beam

A technology of recycled concrete and reinforced concrete beams, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problem of easy cracking stiffness of recycled concrete, to overcome easy cracking and poor stiffness, ensure structural stability, and meet performance indicators Effect

Active Publication Date: 2018-01-09
ZHENGZHOU UNIV +1
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Problems solved by technology

[0004] The main purpose is to provide a new structural design method for steel fiber recycled concrete, which not only effectively overcomes the technical problems of easy cracking and poor stiffness of recycled concrete, but also effectively guarantees the structural stability of steel fiber recycled concrete, and through this The steel fiber recycled concrete stru

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  • Design method of steel fiber recycled concrete beam
  • Design method of steel fiber recycled concrete beam
  • Design method of steel fiber recycled concrete beam

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[0030] Carry out the structural design of steel fiber recycled concrete with a specific structural data to illustrate the design;

[0031] Given that the span of a simply supported beam with a rectangular section of reinforced steel fiber recycled concrete is l=3m, the width l is calculated 0 =2.7m, design bending moment 50kN·m. Quasi-permanent value factor ψ of live load q = 0.5, using C45 steel fiber recycled concrete, using cut bow steel fiber, l f =35mm, nominal diameter d f =0.55mm, tensile strength≥1345N / mm 2 . The mechanical performance index of steel fiber recycled concrete is obtained by experiment, and only the replacement rate δ of recycled aggregate is given here. R =50%, steel fiber volume ratio ρ f = 1.5% (at this time, Mechanical performance index of C45 steel fiber recycled concrete under the condition: standard value f of the axial compressive strength of steel fiber recycled concrete frck =46MPa, the standard value f of the tensile strength of the st...

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Abstract

The invention belongs to the technical field of architectural design structures, particularly relates to a design method of a steel fiber recycled concrete beam, and mainly provides a novel design structure method of steel fiber recycled concrete to effectively solve the technical problems of easy cracking and poor stiffness of the recycled concrete. The design method of the steel fiber recycled concrete beam comprises the steps of 1, determining the sectional width b and sectional height h of the designed reinforcement steel fiber recycled concrete beam; 2, determining the reinforcement ratiopMu of the reinforcement steel fiber recycled concrete beam; 3, determining the deflection value f of the reinforcement steel fiber recycled concrete beam; 4, conducting cracking checking calculation; 5, calculating the width of cracks. The design structure method not only effectively solves the technical problems of easy cracking and poor stiffness of the recycled concrete, but also effectivelyensures the structural stability of the steel fiber recycled concrete, and meanwhile the method is also effectively applied to weighing or non-weighing structure beams.

Description

Technical field: [0001] The invention belongs to the technical field of architectural design structures; in particular, it relates to a design method for steel fiber recycled concrete beams. Background technique: [0002] Recycled concrete means that waste concrete blocks are crushed, cleaned and graded, mixed with gradation in a certain proportion, partially or completely replaced by natural aggregates (mainly coarse aggregates) such as sand and gravel, and then added with cement, water, etc. According to the combination of aggregates, recycled concrete can have the following situations: all aggregates are recycled aggregates; coarse aggregates are recycled aggregates, fine aggregates are natural sand; coarse aggregates are natural crushed Stones or pebbles and fine aggregates are recycled aggregates; recycled aggregates replace part of coarse aggregates or fine aggregates; recycled concrete is an effective means of dealing with construction waste, but now recycled concrete...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 高丹盈朱倩
Owner ZHENGZHOU UNIV
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