Simplified Frame Analysis - Simplified Design of Reinforced Concrete Buildings - page 29

⎛ ⎞

15
K LL A T

Table 2-5 Reduction Multiplier (RM) for Live Load =

0.25 +

⎜ ⎟

⎝ ⎠

Influence Area
K LL A T RM

Influence Area
K LL A T RM

400 a 1.000 5600 0.450

800 0.780 6000 0.444

1200 0.683 6400 0.438

1600 0.625 6800 0.432

2000 0.585 7200 0.427

2400 0.556 7600 0.422

2800 0.533 8000 0.418

3200 0.515 8400 0.414

0.500 b 3600 8800 0.410

4000 0.487 9200 0.406

0.400 c 4800 0.467 10000

5200 0.458

a No live load reduction is permitted for influence area less than 400 sq ft.
b Maximum reduction permitted for members supporting one floor only.
c

Maximum absolute reduction.

2.2.3.1 Example: Live Load Reductions for Building #2

For illustration, typical influence areas for the columns and the end shear walls of Building #2 (5-story flat
plate) are shown in Fig. 2-1. Corresponding live load reduction multipliers are listed in Table 2-6.

Figure 2-1 Typical Influence Areas