The BST binders · Slabs binder · Appendix · updated 27.9.2026

Tables appendixEverything you need next to the exercise

All the tables of the route — on one page, to print and put in the binder. The values — the ones BST uses.

How to use each table — on the page of its step in the binder.

Equivalent span — L₀ = c · L

The coefficients follow the order of the spans in the drawing · orange = cantilever · cantilever on the other side — the same coefficients in reverse order
Scheme	Drawing	c
2 supports		1
3 supports		0.8 · 0.8
4 supports		0.8 · 0.6 · 0.8
2 supports + cantilever (cantilever on the right)		0.9 · 2.2
Cantilever + 2 supports (cantilever on the left)		2.2 · 0.9
Cantilever + 2 supports + cantilever		2.2 · 0.8 · 2.2
Cantilever + 3 supports (cantilever on the left)		2.2 · 0.7 · 0.8

Transfer coefficients — load transfer to the beams

For each span: left|right — the share that goes to the beam on each side · cantilever: 1 — everything to the beam at the root
Scheme	Drawing	Coefficients
2 supports		0.5\|0.5
3 supports		0.4\|0.6 · 0.6\|0.4
4 supports		0.4\|0.6 · 0.5\|0.5 · 0.6\|0.4
2 supports + cantilever (cantilever on the right)		0.4\|0.6 · 1
Cantilever + 2 supports (cantilever on the left)		1 · 0.6\|0.4
Cantilever + 2 supports + cantilever		1 · 0.5\|0.5 · 1
Cantilever + 3 supports (cantilever on the left)		1 · 0.5\|0.5 · 0.6\|0.4

03

K₁₃ — aggregate and concrete

K₁₃
Aggregate B20 B30 B40 B50

Limestone 0.97 1 1.02 1.05
Dolomite 1.01 1.04 1.07 1.09

K₁₃
Aggregate	B20	B30	B40	B50
Limestone	0.97	1	1.02	1.05
Dolomite	1.01	1.04	1.07	1.09

K₁₁ — ribbed slab

One-way solid slab: K₁₁ = 1. Beam with a rectangular section: K₁₁ = 1. Ribbed slab — from the table:

Row: h/t_f · column: b_f/b_w · round to the nearest row and column, no interpolation
h/t_f	3.1	3.2	3.3	3.4	3.5	3.6	3.7	3.8	3.9	4.0	4.1	4.2	4.3	4.4	4.5	4.6	4.7	4.8	4.9	5.0
1.0	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000
1.1	0.981	0.981	0.980	0.980	0.980	0.979	0.979	0.978	0.978	0.978	0.977	0.977	0.976	0.976	0.976	0.975	0.975	0.974	0.974	0.974
1.2	0.962	0.961	0.961	0.960	0.959	0.958	0.958	0.957	0.956	0.955	0.955	0.954	0.954	0.953	0.952	0.951	0.950	0.949	0.948	0.947
1.3	0.943	0.942	0.941	0.940	0.938	0.937	0.936	0.935	0.934	0.933	0.932	0.930	0.929	0.928	0.927	0.926	0.925	0.923	0.922	0.921
1.4	0.924	0.923	0.921	0.920	0.918	0.917	0.915	0.914	0.912	0.910	0.909	0.907	0.906	0.904	0.903	0.901	0.899	0.898	0.896	0.895
1.5	0.906	0.904	0.902	0.900	0.898	0.896	0.894	0.892	0.890	0.888	0.885	0.884	0.882	0.880	0.878	0.876	0.874	0.872	0.870	0.869
1.6	0.887	0.884	0.882	0.880	0.877	0.875	0.873	0.870	0.868	0.866	0.863	0.861	0.859	0.856	0.854	0.852	0.849	0.847	0.845	0.842
1.7	0.868	0.865	0.862	0.860	0.857	0.854	0.851	0.849	0.846	0.843	0.840	0.838	0.835	0.832	0.830	0.827	0.824	0.821	0.819	0.816
1.8	0.849	0.846	0.843	0.840	0.836	0.833	0.830	0.827	0.824	0.821	0.818	0.815	0.811	0.808	0.805	0.802	0.799	0.796	0.793	0.790
1.9	0.830	0.826	0.823	0.819	0.816	0.812	0.809	0.805	0.802	0.798	0.795	0.791	0.788	0.784	0.781	0.777	0.774	0.770	0.767	0.763
2.0	0.811	0.807	0.803	0.799	0.796	0.792	0.788	0.784	0.780	0.776	0.772	0.768	0.764	0.760	0.757	0.753	0.749	0.745	0.741	0.737
2.2	0.810	0.807	0.803	0.799	0.795	0.791	0.787	0.783	0.779	0.775	0.771	0.767	0.763	0.760	0.756	0.752	0.748	0.744	0.740	0.736
2.4	0.809	0.805	0.801	0.797	0.794	0.790	0.786	0.782	0.778	0.774	0.770	0.767	0.763	0.759	0.755	0.751	0.747	0.743	0.739	0.735
2.6	0.808	0.804	0.800	0.796	0.793	0.789	0.785	0.781	0.777	0.774	0.769	0.766	0.762	0.758	0.754	0.750	0.746	0.742	0.738	0.734
2.8	0.808	0.804	0.800	0.797	0.793	0.789	0.785	0.781	0.777	0.773	0.769	0.765	0.761	0.757	0.753	0.749	0.745	0.741	0.737	0.733
3.0	0.808	0.804	0.800	0.796	0.792	0.788	0.784	0.780	0.776	0.772	0.768	0.764	0.760	0.756	0.752	0.748	0.744	0.740	0.736	0.732
3.2	0.807	0.803	0.799	0.795	0.791	0.787	0.783	0.779	0.775	0.771	0.767	0.763	0.759	0.755	0.751	0.747	0.743	0.739	0.735	0.731
3.4	0.806	0.802	0.798	0.794	0.790	0.786	0.782	0.778	0.774	0.770	0.766	0.762	0.758	0.754	0.750	0.746	0.742	0.738	0.734	0.730
3.6	0.806	0.802	0.798	0.794	0.790	0.785	0.781	0.777	0.773	0.769	0.765	0.761	0.757	0.753	0.749	0.745	0.741	0.737	0.733	0.729
3.8	0.805	0.801	0.797	0.793	0.789	0.785	0.781	0.777	0.773	0.769	0.764	0.760	0.756	0.752	0.748	0.744	0.740	0.736	0.732	0.728
4.0	0.804	0.800	0.796	0.792	0.788	0.784	0.780	0.776	0.772	0.768	0.764	0.760	0.755	0.751	0.747	0.743	0.739	0.735	0.731	0.727
4.2	0.804	0.800	0.795	0.791	0.787	0.783	0.779	0.775	0.771	0.767	0.763	0.759	0.755	0.751	0.746	0.742	0.738	0.734	0.731	0.726
4.4	0.803	0.799	0.795	0.791	0.787	0.782	0.778	0.774	0.770	0.766	0.762	0.758	0.754	0.750	0.746	0.741	0.737	0.733	0.729	0.725
4.6	0.802	0.798	0.794	0.790	0.786	0.782	0.778	0.773	0.769	0.765	0.761	0.757	0.753	0.749	0.745	0.740	0.736	0.732	0.728	0.724
4.8	0.802	0.797	0.793	0.789	0.785	0.781	0.777	0.773	0.768	0.764	0.760	0.756	0.752	0.748	0.744	0.740	0.735	0.731	0.727	0.723
5.0	0.801	0.797	0.793	0.788	0.784	0.780	0.776	0.772	0.768	0.764	0.759	0.755	0.751	0.747	0.743	0.739	0.734	0.730	0.726	0.722
5.2	0.800	0.796	0.791	0.787	0.783	0.779	0.775	0.771	0.767	0.763	0.758	0.754	0.749	0.745	0.741	0.737	0.733	0.729	0.725	0.721
5.4	0.799	0.794	0.790	0.786	0.782	0.778	0.774	0.770	0.766	0.762	0.758	0.754	0.749	0.745	0.741	0.737	0.733	0.729	0.725	0.721
5.6	0.797	0.793	0.789	0.785	0.781	0.777	0.773	0.769	0.765	0.761	0.757	0.752	0.748	0.744	0.740	0.736	0.732	0.728	0.724	0.720
5.8	0.796	0.792	0.788	0.784	0.780	0.776	0.772	0.768	0.764	0.760	0.757	0.752	0.748	0.744	0.740	0.736	0.732	0.728	0.724	0.720
6.0	0.795	0.791	0.787	0.783	0.779	0.775	0.771	0.767	0.763	0.759	0.755	0.751	0.747	0.743	0.739	0.735	0.731	0.727	0.723	0.719
6.2	0.794	0.790	0.786	0.782	0.778	0.774	0.770	0.766	0.762	0.758	0.754	0.750	0.746	0.742	0.738	0.734	0.730	0.726	0.722	0.718
6.4	0.793	0.789	0.785	0.781	0.777	0.773	0.769	0.765	0.761	0.757	0.753	0.749	0.745	0.741	0.738	0.734	0.730	0.726	0.722	0.718
6.6	0.791	0.788	0.784	0.780	0.776	0.772	0.768	0.764	0.760	0.756	0.752	0.748	0.744	0.741	0.737	0.733	0.729	0.725	0.721	0.717
6.8	0.790	0.786	0.783	0.779	0.775	0.771	0.767	0.763	0.759	0.755	0.752	0.748	0.744	0.740	0.736	0.732	0.728	0.724	0.720	0.717
7.0	0.789	0.785	0.781	0.777	0.773	0.769	0.765	0.761	0.757	0.753	0.749	0.745	0.741	0.737	0.733	0.729	0.725	0.721	0.717	0.713
7.2	0.788	0.784	0.780	0.776	0.772	0.768	0.764	0.760	0.756	0.752	0.747	0.744	0.740	0.736	0.732	0.728	0.724	0.720	0.716	0.712
7.4	0.787	0.783	0.779	0.775	0.771	0.767	0.763	0.759	0.755	0.751	0.747	0.743	0.739	0.735	0.731	0.727	0.723	0.719	0.715	0.711
7.6	0.786	0.782	0.778	0.774	0.770	0.766	0.762	0.758	0.754	0.750	0.746	0.742	0.738	0.734	0.730	0.726	0.722	0.718	0.714	0.710
7.8	0.785	0.781	0.777	0.773	0.769	0.765	0.761	0.757	0.753	0.749	0.745	0.741	0.737	0.733	0.729	0.725	0.721	0.717	0.713	0.709
8.0	0.784	0.780	0.776	0.772	0.768	0.764	0.760	0.756	0.752	0.748	0.744	0.740	0.736	0.732	0.728	0.724	0.720	0.716	0.712	0.708
8.2	0.783	0.779	0.775	0.771	0.767	0.763	0.759	0.755	0.751	0.747	0.743	0.739	0.735	0.731	0.727	0.723	0.719	0.715	0.711	0.707
8.4	0.782	0.778	0.774	0.770	0.766	0.762	0.758	0.754	0.750	0.746	0.742	0.738	0.734	0.730	0.726	0.722	0.718	0.714	0.710	0.706
8.6	0.780	0.777	0.773	0.769	0.765	0.761	0.757	0.753	0.749	0.745	0.741	0.737	0.733	0.729	0.725	0.721	0.717	0.713	0.709	0.705
8.8	0.779	0.775	0.771	0.768	0.764	0.760	0.756	0.752	0.748	0.744	0.740	0.736	0.732	0.728	0.724	0.720	0.716	0.712	0.708	0.704
9.0	0.778	0.774	0.770	0.766	0.763	0.759	0.755	0.751	0.747	0.743	0.739	0.735	0.731	0.727	0.723	0.719	0.715	0.711	0.707	0.703
9.2	0.777	0.773	0.769	0.765	0.761	0.757	0.754	0.750	0.746	0.742	0.738	0.734	0.730	0.726	0.722	0.718	0.714	0.710	0.706	0.702
9.4	0.776	0.772	0.768	0.764	0.760	0.756	0.752	0.749	0.745	0.741	0.737	0.733	0.729	0.725	0.721	0.717	0.713	0.709	0.705	0.701
9.6	0.775	0.771	0.767	0.763	0.759	0.755	0.751	0.747	0.744	0.740	0.736	0.732	0.728	0.724	0.720	0.716	0.712	0.708	0.704	0.700
9.8	0.774	0.770	0.766	0.762	0.758	0.754	0.750	0.746	0.742	0.739	0.735	0.731	0.727	0.723	0.719	0.715	0.711	0.707	0.703	0.699
10.0	0.773	0.769	0.765	0.761	0.757	0.753	0.749	0.745	0.741	0.738	0.734	0.730	0.726	0.722	0.718	0.714	0.710	0.706	0.702	0.698

Moments and reactions by scheme

F = F_d,max (ribbed — per rib), L in metres
Scheme	Reactions	Over a support (−)	In the span (+)
2 supports	R = 0.5·F·L	—	0.125·F·L²
3 supports, equal	(0.375 \| 1.25 \| 0.375) · F·L	−0.125·F·L²	0.07·F·L²
4 supports, equal	(0.4 \| 1.1 \| 1.1 \| 0.4) · F·L	−0.1·F·L²	0.08·F·L² · middle 0.025·F·L²
3 supports, unequal	0.4·F·L₁ \| 0.6·F·(L₁+L₂) \| 0.4·F·L₂	−F·(L₁+L₂)²/36	F·L₁²/11 · F·L₂²/11
4 supports, unequal	0.4·F·L₁ \| F(0.6L₁+0.5L₂) \| F(0.5L₂+0.6L₃) \| 0.4·F·L₃	−F·(L₁+L₂)²/36 · −F·(L₂+L₃)²/36	F·L₁²/11 · F·L₂²/15 · F·L₃²/11
Cantilever (L_z)	—	−0.5·F·L_z²	—

Bar table — solid slab

Reinforcement area per 1 m width (cm²/m) — diameter (mm) × spacing (cm), maximum spacing 25
Φ	@7	@8	@9	@10	@11	@12	@13	@14	@15	@16	@17	@18	@19	@20	@21	@22	@23	@24	@25
8	7.18	6.28	5.59	5.03	4.57	4.19	3.87	3.59	3.35	3.14	2.96	2.79	2.65	2.51	2.39	2.28	2.18	2.09	2.01
10	11.22	9.82	8.73	7.85	7.14	6.54	6.04	5.61	5.24	4.91	4.62	4.36	4.13	3.93	3.74	3.57	3.41	3.27	3.14
12	16.16	14.14	12.57	11.31	10.28	9.42	8.70	8.08	7.54	7.07	6.65	6.28	5.95	5.65	5.38	5.14	4.91	4.71	4.52
14	21.99	19.24	17.10	15.39	13.99	12.83	11.84	11.00	10.26	9.62	9.05	8.55	8.10	7.69	7.33	6.99	6.69	6.41	6.15
16	28.73	25.14	22.34	20.11	18.28	16.76	15.47	14.36	13.41	12.57	11.83	11.17	10.58	10.05	9.55	9.12	8.72	8.36	8.03
18	36.36	31.81	28.28	25.45	23.14	21.21	19.57	18.18	16.97	15.90	14.97	14.14	13.39	12.72	12.11	11.56	11.06	10.60	10.17
20	44.87	39.26	34.90	31.41	28.55	26.17	24.16	22.44	20.94	19.64	18.48	17.46	16.54	15.72	14.96	14.28	13.66	13.09	12.57
22	54.28	47.50	42.22	38.00	34.55	31.67	29.23	27.14	25.33	23.76	22.35	21.11	20.00	19.00	18.09	17.27	16.52	15.83	15.20

Bar table — ribbed slab

Reinforcement area per rib (cm²) — diameter (mm) × number of bars, at least 2 per rib
Φ	2	3	4	5	6	7	8	9	10
8	1.01	1.51	2.01	2.51	3.02	3.52	4.02	4.52	5.03
10	1.57	2.36	3.14	3.93	4.71	5.50	6.28	7.07	7.85
12	2.26	3.39	4.52	5.65	6.79	7.92	9.05	10.18	11.31
14	3.08	4.62	6.16	7.70	9.24	10.78	12.32	13.85	15.39
16	4.02	6.03	8.04	10.05	12.06	14.07	16.08	18.10	20.11
18	5.09	7.63	10.18	12.72	15.27	17.81	20.36	22.90	25.45
20	6.28	9.42	12.57	15.71	18.85	21.99	25.13	28.27	31.42
22	7.60	11.40	15.21	19.01	22.81	26.61	30.41	34.21	38.01
24	9.05	13.57	18.10	22.62	27.14	31.67	36.19	40.72	45.24
25	9.82	14.73	19.63	24.54	29.45	34.36	39.27	44.18	49.09

08

Material data

B30 B40 B50

f_cd 13 17.4 21.7
ρ (A_s,min) 0.0013 0.00157 0.0018

Steel: f_sd = 4350 (P500) — and in booklets that use 10⁴: 435. Concrete weight 2.5 t/m³, block 0.5 t/m³.

	B30	B40	B50
f_cd	13	17.4	21.7
ρ (A_s,min)	0.0013	0.00157	0.0018

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Slabs binder · BST · beamsolvertool.com/en/learn/slabs/tables/

Solve a slab in BST BST pulls every value from these tables by itself — step by step

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Tables appendixEverything you need next to the exercise

Equivalent span — L0 = c · L

Transfer coefficients — load transfer to the beams

K13 — aggregate and concrete

K11 — ribbed slab

Moments and reactions by scheme

Bar table — solid slab

Bar table — ribbed slab

Material data

Equivalent span — L₀ = c · L

K₁₃ — aggregate and concrete

K₁₁ — ribbed slab