CE 415 Design of steel structures

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CE 318

STRUCTURE ANALYSIS AND DESIGN II LAB

LECTURE 1 BUILDING PLAN

SEMESTER: SPRING 2021

COURSE TEACHER: SAURAV BARUA CONTACT NO: +8801715334075

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INTRODUCTION

In this course, we do structural design of a multistoried building.

This course requires knowledge on CE 315: Design of concrete structure I, CE 317: Design of concrete structure II and CE 331:

Geotechnical Engineering II

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COURSE CONTENT

Design of RCC slab

Load calculation of beam

Design of beam

Load calculation and design of column

Pile cap layout and design of pile cap

Design of OHWT

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MARKS DISTRIBUTION

Marks

Attendance 10

Class performance 25

Lab Report 15

Final Exam 50

Total 50

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LECTURE PLAN

General Discussion on building design

Building plan and elevation

Construction material properties

Slab thickness and ACI codes

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BUILDING PLAN

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BUILDING ELEVATION

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BUILDING INFORMATION

• Concrete crushing strength, f_c^’= 3000 psi = 3 ksi

• Steel yield strength, f_y= 60000 psi = 60 ksi (60 grade steel)

• 6- storied building

• 3 span in X and Y direction

• Total building height = 60’ and each floor-ceiling height = 10’

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MATERIALS INFORMATION

• Concrete crushing strength

For brick chips , f_c^’= 3000 psi For stone chips , f_c^’= 4000 psi = 4 ksi

 Steel yield strength, f_y= 60 ksi (60 grade steel), f_y = 40 ksi (40 grade steel) and f_y = 75 ksi (75grade steel),

• 500 W means steel is weld able (W) and yield strength 500 Mpa = 72.5 ksi

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SLAB OUTLINE

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TWO WAY SLAB

• Group same dimension slabs into one group. Here we have 6-slabs per floor.

• Here we have two types of slab, S1 16’x18’ and S2 16’x15’

• There is no cantilever portion

• All 6 slabs are two way slab.

• Since l_a/l_b >0.5, l_a= shorter span, l_b= longer span, so two way slab

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ACI COEFFICIENT METHOD

• We will use ACI coefficient method for slab design, which approved in BNBC 2015 code as well.

• Calculate Dead load (DL) moment and Live load (LL) moment.

• It consists with three tables.

• -ve moment coefficient

• +ve DL moment coefficient

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SLAB THICKNESS

• Thumb rule

Slab thickness = perimeter/180 Our largest slab = 16’x18’

So, taking the largest slab = 2x (16’+18’)x 12/180 = 4.53” ≈ 5”

Why choose largest slab think!!! We try to make slab thickness same for entire floor.

Minimum slab thickness for beam slab = 5”

And minimum slab thickness for flat slab = 7”