Challenge

Week 4 Challenge

PPooja Lahot15 Jan 2023

Q1) SECTION CLASSIFICATION OF BEAMS
A beam is a structural element that is capable of withstanding load primarily by resisting against bending.
Based on yield and plastic moments , sections are classified as :
>Plastic
>Compact
>Semi compact
>Slender

i) ISMB 500 - It is an I section , rolled and develops plastic hinges and rational capacity required for failure of structure. Therefore , it goes under class 1 Plastic.
ii) ISMC 200 - It is an I section , rolled and develops plastic hinges and rational capacity required for failure of structure. Therefore , it goes under class 1 Plastic. Its d/t ratio is 84.
iii) PG 1300 x 450 x 20 x 12 - It is an I section , rolled and develops plastic hinges and rational capacity required for failure of structure. Therefore , it goes under class 1 Plastic. Its d/t ratio is 84.
iv) Double angle (Back to back) – 2 x ISA 75x75x6 - Its b/t ratio is 10.5 . It is Compact section.
v) RHS - 150 x 100 x10 - It falls under box element. Therefore, it is compact section.
vi) Builtup box – 1000 x 450 x 20 x 12 - It falls under box element. Therefore, it is compact section.

Q2) EFFECTIVE LENGTH CALCULATION

According to IS provsions , the support conditions are restrained to rotation , then effective length = 0.75L = 0.75 *40 = 30 m

The effective span of a member that is not built intergrally with its supports shall be taken as clear span plus the effective depth of slab or beam or centre of supports, whichever is less.