  ##### Calculation theory of normal section bearing capacity of glass fiber cloth Mar 18, 2022| View:104

Calculation theory of normal section bearing capacity of glass fiber cloth:

Simplification of the stress graph in the compression zone In order to simplify the calculation, the stress graph of the compression zone of the glass fiber cloth GFRP reinforced concrete beam is simplified into an equivalent rectangular stress graph, as shown in Figure 6-34.

The equivalent conditions for the two graphs are:

① The resultant force C of the concrete compressive stress is equal in size:

② The action point of the resultant force C in the compression zone in the two graphs remains unchanged,

When the glass fiber cloth GFRP reinforced concrete beam reaches the limit state, the distribution of the compressive stress of the concrete in the compression zone of the section is a curve.

The total pressure C of the concrete in the compression zone, that is, the area of the compressive stress graph is c.

The distance from the action point of the resultant force to the top of the beam is -b(xc-y)dy.

When the areas of the two figures are equal and the centroids coincide, the resultant pressure value and the action position are the same, and the two are completely equivalent. Let the height of the compression zone of the equivalent compressive stress figure be Bixe and the compressive stress to be a1fe (Fig. 6; 35 ). The glass fiber cloth can draw the following conclusions according to the equivalent conditions.

①The distance from the center of the rectangle to the top surface is B/2, which is equal to formula (6-2).

②The area is equal.

Concrete uniaxial compression stress-strain curve equation According to my country's concrete structure design specification, the stress-strain curve equation of concrete uniaxial compression is as follows.

aa, ad - the parameter values of the ascending and descending sections of the uniaxial compressive stress-strain curve shall be adopted in accordance with Table C.2.1 of the Specification for Design of Concrete Structures (GB 50010.200);

f: uniaxial compressive strength of concrete;

The peak compressive strain of glass fiber cloth concrete corresponding to Ec- and f:" shall be adopted in accordance with the provisions of the design specification for concrete structures.

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