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Design, Construction and Stability Study of Concrete Shell Roof Suitable for Rural Houses

M. Z. Abedin
Department of Farm Structures Bangladesh Agricultural University, Mymensingh.

M.A. Rashid
Department of Farm Structures Bangladesh Agricultural University, Mymensingh.

Abstract/ Executive Summary:

: This study attempts to investigate the economic feasibility of thin shell roofing reinforced with 14 gauge wires. A computer program (BASIC) using mem brane theory has been developed to select the appropriate shell dimensions based on safe shell stresses and moments. The design was done following ACI code provisions. The rigidity of the roof was checked by applying the design load using gunny bags filled with sand in addition to the dead weight.The study was accomplished by constructing a test house of dimension 12 x 20 ft at plinth level. The thickness of the shell at crown was 1 inch and that at the edge beam was 1.5 inch with shell slope 300• At middle and 1 ft inside the tie beam, the maximum vertical deflections of the shell were 0.174 & 0.148 inches, respectively. while the total lateral deviations were 0.15 and 0.014 inches, respectively. The estimated cost of the model house was found to be taka 88.00 per sq ft. of the floor area inclusive of a 5 inch brick wall at the boundary.

Keywords: : Shelf roof, Stability, Roof

Location:

Start Date:

End Date:

Program Area: Farm Mechanization

Commodity: Farm machineries

Objectives:

1.To select an appropriate shell pattern for replacing the tin roofing

2. To check the shell deflections under design load in addition to self dead road

3.To compare the construction cost with that of an equivalent semi-pucca tin house based on PWD schedule rates.

Methodology:

Design consideration : The shall is a curved slab whose length, L is very large compared with its thickness. A shell is thin when the radius of cur vature is limited to 20 times its thick ness. Shell can be classified according to Gibson Long Shel! r/L<0.4Short Shetr r/L>2 Intermediate Shell

Source of Information: Bangladesh J. Agril. Sci. 19 (2} : 323-328 : July, 1992 ISSN 0379-4296

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The study was accomplished by constructing a test house of dimension 12 x 20 ft at plinth level. The thickness of the shell at crown was 1 inch and that at the edge beam was 1.5 inch with shell slope 300• At middle and 1 ft inside the tie beam, the maximum vertical deflections of the shell were 0.174 & 0.148 inches, respectively. while the total lateral deviations were 0.15 and 0.014 inches, respectively. The estimated cost of the model house was found to be taka 88.00 per sq ft. of the floor area inclusive of a 5 inch brick wall at the boundary.

Knowledge Management: Journal