Engr.Md.Marufur Rahman

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Engr.Md.Marufur Rahman Civil & Architect blogs
constriction steel & Rcc high rise building

āφāĻŽāĻžāϰ āĻŽāύ⧇ āĻ•ā§Ÿā§‡āĻ• āϟāĻž  āĻĒā§āϰāĻļā§āύ āĻ°ā§Ÿā§‡ āϗ⧇āϞ⧋,ā§Ļā§§āĨ¤ āĻāϟāĻž āĻ•āĻŋ āϚāĻžāϰ āĻĒāĻžāρāϚ āϤāϞāĻž āĻŦāĻŋāĻ˛ā§āĻĄāĻŋāĻ‚ āĻāϰ āϜāĻ¨ā§āϝ āχāϏ⧇āĻ¨ā§āĻŸā§āϰāĻŋāĻ• āĻĢ⧁āϟāĻŋāĻ‚ āĻĄāĻŋāϜāĻžāχāύ āĻ•āĻŋ āĻĒāϏāĻŋāĻŦāϞāĨ¤āĻāχ āϰ⧇āχāύāĻĢā§‹āĻ°ā§āϏāĻŽ...
31/10/2026

āφāĻŽāĻžāϰ āĻŽāύ⧇ āĻ•ā§Ÿā§‡āĻ• āϟāĻž āĻĒā§āϰāĻļā§āύ āĻ°ā§Ÿā§‡ āϗ⧇āϞ⧋,
ā§Ļā§§āĨ¤ āĻāϟāĻž āĻ•āĻŋ āϚāĻžāϰ āĻĒāĻžāρāϚ āϤāϞāĻž āĻŦāĻŋāĻ˛ā§āĻĄāĻŋāĻ‚ āĻāϰ āϜāĻ¨ā§āϝ āχāϏ⧇āĻ¨ā§āĻŸā§āϰāĻŋāĻ• āĻĢ⧁āϟāĻŋāĻ‚ āĻĄāĻŋāϜāĻžāχāύ āĻ•āĻŋ āĻĒāϏāĻŋāĻŦāϞāĨ¤āĻāχ āϰ⧇āχāύāĻĢā§‹āĻ°ā§āϏāĻŽā§‡āĻ¨ā§āϟ āĻ āϝāĻĻāĻŋ āĻ•āϞāĻžāĻŽ āϞ⧋āĻĄ āύāĻŋāϤ⧇ āĻĒāĻžāϰ⧇ āϤāĻžāĻšāϞ⧇ āĻāĻ•ā§āϏāĻŸā§āϰāĻž āĻĢ⧁āϟāĻŋāĻ‚ āĻĻ⧇āĻ“ā§ŸāĻžāϰ āĻŽāύ⧇ āĻ•āĻŋ?
ā§Ļ⧍.āύāĻž āĻ•āĻŋ āĻĢ⧁āϟāĻŋāĻ‚ āĻĄāĻŋāϜāĻžāχāύ āĻšā§Ÿ āύāĻžāχ?

ā§Ļā§Š.Etabs model seconary beam āϏāĻŦ āϏāĻŽā§Ÿ primary beam āĻāϰ āωāĻĒāϰ āĻĒāϰ⧇ āφāϰ secondary beam āĻāϰ moment āϰāĻŋāϞāĻŋāϜ āĻ•āϰāĻž āĻšā§Ÿ, āύāĻž āĻšāϞ⧇ āϜāĻ¨ā§āĻŽā§‡āϰ āĻĒā§‚āĻ°ā§āĻŦ⧇āχ āĻŽāĻžā§Ÿā§‡āϰ āĻ—āĻ°ā§āĻŦ⧇ āĻŦāĻžāĻšā§āϚāĻž āĻŽāĻžā§Ÿā§‡āϰ āĻšā§‡ā§Ÿā§‡ āĻŦ⧜āĨ¤āϝāĻž āĻ•āĻ–āύ⧋ āϕ⧋āύ āĻĻāĻŋāύ āĻĒāϏāĻŋāĻŦāϞ āύāĻžāĨ¤

ā§Ļā§Ē.BNBC āϕ⧋āĻĨāĻžā§ŸāĻ“ āĻ•āĻŋ āĻĻ⧇āĻ–āĻžāύ⧋ āĻšā§Ÿā§‡āϛ⧇ āĻĻ⧁āχāϟāĻž secondary beam āĻāϕ⧇ āĻ…āĻĒāϰ⧇āϰ āωāĻĒāϰ⧇ āĻĒ⧜āϤ⧇ āĻĒāĻžāϰ⧇?
āĻ āĻĒā§āϝāĻžāĻ•āϟāĻŋāϏ āϟāĻž āĻ­ā§‚āϞāĨ¤āĻāϟāĻž āϭ⧁āĻŽāĻŋāĻ•āĻŽā§āĻĒ⧇āϰ āϜāĻ¨ā§āϝ āĻā§āĻ•āĻŋāĻĒā§‚āĻ°ā§āĻŖāĨ¤āϧāĻ¨ā§āϝāĻŦāĻžāĻĻāĨ¤

28/10/2026
24/10/2026

Pulping area with water tank

24/10/2026

Steel column filup with grout

24/10/2026

Steel mezanine building design.

23/10/2026

đŸ—ī¸ āĻĒāĻžāχāϞ⧇āϰ Allowable Structural Capacity: ACI 318-19 āĻ…āύ⧁āϝāĻžāϝāĻŧā§€

āĻ…āύ⧇āϕ⧇āχ Geotechnical capacity ar Structural capacity guliye felen. ACI 318-19 er *13.4.2* e Allowable Stress Method (ASD) e structural capacity ber korar clear formula deya ache.

āĻāϟāĻŋ āĻŦā§āϝāĻŦāĻšāĻžāϰ⧇āϰ ⧍ āϟāĻž āĻļāĻ°ā§āϤ (ACI 13.4.2.1):
1. āĻĒāĻžāχāϞ āĻĒ⧁āϰ⧋ āĻĻ⧈āĻ°ā§āĻ˜ā§āϝ⧇ lateral support āĻĒāĻžāĻšā§āϛ⧇ (āĻŽāĻžāϟāĻŋ āύāϰāĻŽ āĻšāϞ⧇āĻ“ S_u < 10 kPa āύāĻž āĻšāϞ⧇ ok)
2. Bending moment < P_a \times (0.05 \times D) -mane 5% accidental eccentricity er beshi moment thakbe na

āĻĒāĻžāχāϞ⧇āϰ āϧāϰāύ āĻ…āύ⧁āϝāĻžāϝāĻŧā§€ P_a(Allowable Axial):

> Note: A_g = Gross concrete area, A_s = Main rebar area (Casing/pipe er steel A_s e dhora jabe na)

*1. Uncased Cast-in-place (Drilled/Augered):*
P_a = 0.30 f'_c A_g + 0.40 f_y A_s
*2. Permanent casing thakle kintu ACI 13.4.2.3 er confinement condition fulfill na korle:*
P_a = 0.33 f'_c A_g + 0.40 f_y A_s
*3. Confined Metal-Cased Pile (13.4.2.3 onujayi casing thickness, seam, f'_csob fulfill korle):*
P_a = 0.40 f'_c A_g
_Ekhetre rebar er contribution alada dhora hoy na, karon casing e confinement dicche._

*4. Precast Non-Prestressed Pile:*
P_a = 0.33 f'_c A_g + 0.40 f_y A_s
*5. Precast Prestressed Pile:*
P_a = (0.33 f'_c - 0.27 f_{pc}) A_g
_Ekhane f_{pc} holo effective prestress er por residual compression._

* 3 ta jinish vul korben na:*
1. A_ghisab e casing er vitorer concrete er area dhorte hobe, bairer na.
2. Steel casing ba pipe er area A_s er sathe add kora jabe na ACI te.
3. Eta sudhu *Structural Capacity*. *Geotechnical Capacity (skin friction + end bearing)* alada vabe ber korte hobe. Design e 2 tar moddhe jeta choto setai governing hobe P_{allowable}.e

13/10/2026

Shed building construction check time.

11/10/2026

Precast pile pile cap

11/10/2026

45 ft precast pile for 4 storied Mosque.

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Savar. Manikganj.
Dhaka

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