SEC-A-Lecture -1 Design Philosophies_For print

SEC-A-Lecture -1 Design Philosophies_For print - N-W.F.P....

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1 N-W.F.P. University of Engineering and Technology Peshawar Design of Steel Structures CE-409 1 By: Prof Dr. Akhtar Naeem Khan chairciv@nwfpuet.edu.pk Course Content y Design philosophies y Introduction to Steel Structures y Design of Welded connections y Design of Bolted connections CE-411: Lecture 01 Prof. Dr Akhtar Naeem Khan 2 y Design of Tension Members y Design of Compression Members
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2 Course Content y Design of Column Bases y Design of Beams y Design of Composite Beams y Design of Plate Girders CE-411: Lecture 01 Prof. Dr Akhtar Naeem Khan 3 Design of Plate Girders N-W.F.P. University of Engineering and Technology Peshawar Lecture 01: Design Philosophies 4 By: Prof Dr. Akhtar Naeem Khan chairciv@nwfpuet.edu.pk
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3 Topics to be covered y Design philosophies y Limit States y Design Considerations y Allowable Stress Design (ASD) y Load and Resistance Factor Design (LRFD) CE-411: Lecture 01 Prof. Dr Akhtar Naeem Khan 5 y Design process Design Philosophies y A general statement assuming safety in engineering design is: y Resistance Effect of applied loads ---(1) y In eq(1) it is essential that both sides are evaluated for same conditions and units e.g. CE-411: Lecture 01 Prof. Dr Akhtar Naeem Khan 6 compressive stress on soil should be compared with bearing capacity of soil
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4 CE-411: Lecture 01 Prof. Dr. Akhtar Naeem Khan 7 Design Philosophies y Resistance of structures is composed of its members which comes from materials & X-section y Resistance, Capacity, and Strength are somewhat synonym terms. CE-411: Lecture 01 Prof. Dr Akhtar Naeem Khan 8 y Terms like Demand, Stresses, and Loads are used to express Effect of applied loads.
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5 CE-411: Lecture 01 Prof. Dr. Akhtar Naeem Khan 9 CE-411: Lecture 01 Prof. Dr. Akhtar Naeem Khan 10
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6 CE-411: Lecture 01 Prof. Dr. Akhtar Naeem Khan 11 CE-411: Lecture 01 Prof. Dr. Akhtar Naeem Khan 12
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7 CE-411: Lecture 01 Prof. Dr. Akhtar Naeem Khan 13 Limit States y When particular loading reaches its limit, failure is the assumed result, i.e. the loading condition become failure the loading condition become failure modes, such a condition is referred to as limit state and it can be defined as y “A limit state is a condition beyond which a structural system or a structural CE-411: Lecture 01 Prof. Dr Akhtar Naeem Khan 14 component ceases to fulfill the function for which it is designed.”
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8 y There are three broad classification of Limit States limit states: 1. Strength limit states 2. Serviceability limit states 3 Special limit states CE-411: Lecture 01 Prof. Dr Akhtar Naeem Khan 3. Special limit states 15 Strength Limit States: • Flexure Torsion Limit States Fatigue • Settlemen • Torsion • Shear Settlement • Bearing CE-411: Lecture 01 Prof. Dr Akhtar Naeem Khan 16
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9 Serviceability Limit States: Cracking Limit States • Cracking • Excessive Deflection • Buckling • Stability CE-411: Lecture 01 Prof. Dr Akhtar Naeem Khan 17 Limit States Special Limit States: y Damage or collapse in extreme earthquakes.
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SEC-A-Lecture -1 Design Philosophies_For print - N-W.F.P....

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