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Stud connection-based steel-concrete composite beam calculation model analysis method

A technology of calculation model and analysis method, which is applied in the field of simplified analysis of stud shear connectors and calculation model analysis of steel-concrete composite beams based on stud connections, can solve problems such as limiting the promotion of steel-concrete composite structural beams, To achieve the effect of convenient quantitative analysis, strong practicability, and intuitive force

Active Publication Date: 2018-10-02
HUNAN ARCHITECTURAL DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] These unconventional refined research methods are not mastered and applied by ordinary structural designers, and this field still lacks a practical method that can fully quantify the interface slip of steel-concrete composite structures and efficiently save computing resources. Simplified calculation and analysis methods greatly limit the promotion of steel-concrete composite structural beams

Method used

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  • Stud connection-based steel-concrete composite beam calculation model analysis method
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  • Stud connection-based steel-concrete composite beam calculation model analysis method

Examples

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Embodiment 2

[0143] Example 2, please refer to Figure 6 , Figure 7 and Figure 9 , the parameters of the flange plate of the reinforced concrete slab in the "box" simply supported composite beam are: slab thickness 120mm, width 800mm, C40concrete f ck =26.8N / mm 2 ,E c =3.25x10 4 N / mm 2 , the steel is Q235B, f s =235N / mm 2 ,E s =2.06x10 5 N / mm 2 ;

[0144] Among them, SCBB-1, the diameter d of the stud is used s =16@100, according to the equivalent diameter d in Table 1 eq = 23, the finite element analysis model is established in the MIDAS general finite element program, and its mid-span load-deflection (P-f) curve is as follows Figure 9 .

[0145] The span height of the composite beam is L / h=4.0 / 0.54=7.4, and the shear connection nf=0.55. Since there is no original data, the difference between the simulated value and the experimental value cannot be known, but according to literature and papers, the deflection-span ratio is 1 / When the stiffness is less than 500, the nume...

Embodiment 3

[0147] Embodiment three, please refer to Figure 6 , Figure 7 and Figure 10 , take the value according to the typical steel-concrete composite beam bridge section in actual engineering, the steel-concrete flange plate thickness is 200mm, the flange plate stem rib thickness is 250mm, the flange plate width is 3200mm, C50concrete ck =32.4N / mm 2 ,E c =3.45x10 4 N / mm 2 , the steel is Q345C, f s =345N / mm 2 ,E s =2.06x10 5 N / mm 2 ;

[0148] Among them, SCBB-1, the diameter d of the stud is used s =22@150, arranged in 3 rows, take the equivalent diameter d according to Table 1 eq = 48, the finite element analysis model is established in the MIDAS general finite element program, and the mid-span load-deflection (P-f) curve of the bridge mid-girder is as follows Figure 10 .

[0149] Composite beam span height L / h = 39.25 / 1.7 = 23, shear connection degree nf = 4.3, the difference between the simulated value and the experimental value is unknown, but according to the lit...

Embodiment 4

[0165]Embodiment 4, in order to further study the relationship between the stress characteristics and section characteristics of the composite beam mid-span load-deflection (P-f) curve from linear to nonlinear deformation, the "I-shaped" simply supported combination in Embodiment 1 Numerical simulations of the whole process were carried out for two types of composite beams (the neutral axis of the composite section is in the concrete) and the "box-shaped" simply supported composite beam in Example 2 (the neutral axis of the composite section is in the steel beam) Calculation and analysis (considering the core 3d concrete contribution, according to the diameter d of studs in 120 thick slabs in Table 1 s Take 16mm, the corresponding equivalent diameter d eq =23), mainly researching different height-span ratios (h / L 0 ) of the composite beam at the end of the simply supported beam at 0.1L, the maximum shear force of the studs and the change law of the shear stiffness of the stud...

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Abstract

The invention relates to a stud connection-based steel-concrete composite beam calculation model analysis method. The method comprises the following steps of 1, building a stud shear connector composite beam calculation analysis model; 2, proposing that the overall shear stiffness Dsc of a stud comprises the shear stiffness Ds of the stud and the stiffness Dc of concrete in the range of a concentric circle with the diameter nds; 3, introducing a reduction coefficient beta of a working state of the overall shear stiffness of the stud to obtain equivalent lateral stiffness Deq; and 4, accordingto a lateral stiffness equivalence principle, making the stud equivalent to a short steel beam unit, and proposing that different values of the equivalent diameter deq of the short steel beam unit areused for simulating the mechanical performance of the stud in different working states. The method has the advantages that the calculation process is high in efficiency; a calculation result can quantitatively reflect interface slip of a steel-concrete composite structure and stress states of parts in stress periods of the composite structure; the practicality is high; and the method is easily understood and mastered by structure designers.

Description

technical field [0001] The invention relates to the field of composite structure engineering, in particular to a calculation model analysis method for steel-concrete composite beams based on stud connections, which is applied to the simplification of stud shear connectors in general finite element calculation and analysis programs for steel-concrete composite beams analyze. Background technique [0002] The shear connector is the key stress member connecting the reinforced concrete slab and the steel structure in the steel-concrete composite structure. The mechanical properties of the shear connector directly affect the stress state of the composite member. Stud shear connectors are the most commonly used shear connectors for steel-concrete composite structures. The shear bearing capacity of stud shear connectors, stud shear stiffness and stud arrangement in the combined action are related to the stress magnitude and stress distribution of reinforced concrete flange plates ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/13G06F2119/06
Inventor 曹华
Owner HUNAN ARCHITECTURAL DESIGN INST
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