RHCES Prestressed Beam — Stress Check (Transfer & Service)

Input

f'c (MPa, 28-day)

f'ci (MPa, at transfer)

Section A (mm²)

Section I (mm⁴)

y_top (mm)

y_bot (mm)

Initial prestress P_i (kN)

Eccentricity e (mm, +down)

Loss ratio at service ηP_eff = η · P_i. Typical 0.78–0.85.

Self-weight moment M_sw (kN·m)

Service moment M_s (kN·m)Total at service incl. DL+LL+SW.

Class

Results

σ_top at transfer—

σ_bot at transfer—

σ_top at service—

σ_bot at service—

Allowable f_ti (transfer tens.)—

Allowable f_ci (transfer comp.)—

Allowable f_ts (service tens.)—

Allowable f_cs (service comp.)—

Sign convention & formulas

Compression (−), tension (+). σ = −P/A ± P·e·y/I ∓ M·y/I. Transfer uses P_i and M_sw only. Service uses P_eff=η·P_i and M_s. Allowables (ACI 24.5): f_ti=0.50√f'ci, f_ci_allow=0.60·f'ci, f_ts=0.62√f'c (Class U), f_cs=0.45·f'c sustained.

Input Reset

Results

Input