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Concrete Design
2 tools in the Civil and Geotechnical area.
Reinforced Concrete Beam and Column
Strength design of a rectangular or T reinforced-concrete beam and of a rectangular or circular tied or spiral column by strain compatibility with the ACI 318 equivalent rectangular stress block: the neutral axis solved for any arrangement of tension, second-layer and compression bars (compression steel yielding or not), the nominal moment M_n, the net tensile strain and the strength-reduction factor φ with the tension- and compression-controlled limits entered (ACI 318-19 §21.2 values as defaults), the steel ratios ρ and ρ_b, the minimum reinforcement, the one-way shear strength V_c + V_s with the stirrup spacing limits, the gross and cracked moments of inertia and the Branson / Bischoff effective inertia at a service moment; for the column the full P_n–M_n interaction diagram from pure compression to pure tension with the 0.80 / 0.85 P_o cap and the φ transition, and the factored (P_u, M_u) checked by the radial ratio. The method is that of USACE EM 1110-2-2104, whose appendix examples the tool reproduces; the default is an illustrative 12 × 24 in beam with 3 No. 8 bars under 150 kip-ft and 40 kip, and a 16 × 16 in column with 8 No. 8 bars under 400 kip and 120 kip-ft.
1 worked example reproduced, listed on the tool page.
Concrete Slab and Footing Design
Strength design of reinforced-concrete slabs and footings with the ACI 318 equations as mathematics and every code factor entered (φ, load factors, moment coefficients, strip percentages, the 0.0018 minimum): a one-way slab by the simple-span forms or entered moment coefficients with flexure, bar spacing, one-way shear (the basic and the size-effect V_c), temperature steel, crack control and the minimum thickness; a two-way flat plate by the direct design method with M_0, the negative / positive split, the column-strip and middle-strip moments, punching shear at the column with the three v_c expressions and the unbalanced-moment transfer γ_v M_sc c/J_c, and a drop-panel option; a spread footing sized from the service load on the net allowable pressure with one-way shear at d, two-way shear at d/2, flexure at the column face, bars with the minimum, development length, bearing at the column base and dowels; a combined or strap footing with the resultant, the plan size for uniform pressure, the shear and moment diagrams by beam analysis, longitudinal and transverse flexure and punching at each column; and a wall footing per unit length. Every check prints the nominal and φ-factored strength, the demand-to-capacity ratio and the LRFD margin. The spread footing reproduces the FEMA P-751 Chapter 5 example; the default is an illustrative 14 × 14 in column with P_D = 150 and P_L = 100 kips on 4 ksf, f′_c = 4,000 psi, f_y = 60 ksi.
1 worked example reproduced, listed on the tool page.
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Design Loads · Steel Design · Foundations · Soils · Timber and Masonry · Hydraulics · Surveying and Earthwork