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# (6.7 Iš dalies apkrovos veikiamos zonos)

### (Gelžbetoninių konstrukcijų projektavimas)

(1)P For partially loaded areas, local crushing (see below) and transverse tension forces (see 6.5) shall be considered.

(2) For a uniform distribution of load on an area $A_c_0$ (see Figure below) the concentrated resistance force may be determined as follows: $$F_R_d_u=A_c_0·f_c_d·√{A_c_1/A_c_0} ≤ 3.0·f_c_d·A_c_0 \;\; \text"(6.63)"$$ where:
$A_c_0$ is the loaded area,
$A_c_1$ is the maximum design distribution area with a similar shape to $A_c_0$

(3) The design distribution area $A_c_1$ required for the resistance force $F_R_d_u$ should correspond to the following conditions:

• The height for the load distribution in the load direction should correspond to the conditions given in Figure below
• the centre of the design distribution area $A_c_1$ should be on the line of action passing through the centre of the load area $A_c_0$.
• If there is more than one compression force acting on the concrete cross section, the designed distribution areas should not overlap.
The value of $F_R_d_u$ should be reduced if the load is not uniformly distributed on the area $A_c_0$ or if high shear forces exist.

(4) Reinforcement should be provided for the tensile force due to the effect of the action.

### Partially loaded areas design parameters

Partially loaded areas FREE calculator online

$$d_1\,(mm)$$

$$b_1\,(mm)$$

$$h\,(mm)$$

$$f_c_k\,(MPa)$$

$$α_c_c$$

$$ɣ_c$$