03Fundamentals

03Fundamentals - Lecture 3 - Fundamentals September 6, 2002...

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Lecture 3 - Fundamentals Lecture 3 - Fundamentals September 6, 2002 CVEN 444
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Lecture Goals Lecture Goals Advantages and disadvantages of concrete structures Design Process Limit states Design Philosophy Loading
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Advantages of Concrete Structures Advantages of Concrete Structures Economical Thinner floor systems Reduced Building Height Lower wind loads (< A) Saving in Cladding Materials widely available
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Advantages of Concrete Structures Advantages of Concrete Structures Suitability of material for architectural and structural function Concrete place in plastic condition - desired shape & texture can be obtained with forms and finishing techniques Designer can choose shape and size
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Advantages of Concrete Structures Advantages of Concrete Structures Fire Resistance Concrete building have 1-3 hour fire rating with no fire proofing (steel and timber require fireproofing to obtain this rating) Rigidity Greater stiffness & mass reduces oscillations (wind), floor vibrations (walking)
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Advantages of Concrete Structures Advantages of Concrete Structures Low Maintenance Availability of Materials – Sand, gravel, cement, H 2 0 & concrete mixing facilities widely available Reinforcement - easy to transport as compared to structural steel
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Disadvantages of Concrete Structures Disadvantages of Concrete Structures Low tensile strength - ~ 0.1 f c cracking if not properly reinforced
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Disadvantages of Concrete Structures Disadvantages of Concrete Structures Forms and Shoring (additional steps) Construction of forms Removal of forms Prepping (or shoring) the new concrete to support weight until strength is adequate. Labor/Materials cost not required for other types of materials
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Disadvantages of Concrete Structures Disadvantages of Concrete Structures Strength per unit volume is relatively low. – f c ~ (5-10% of steel) greater volume required long spans typical built with steel
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Disadvantages of Concrete Structures Disadvantages of Concrete Structures Time-dependent volume changes Concrete & steel undergo similar expansion and contraction. Concrete undergoes drying shrinkage, which may cause deflections and cracking. Creep of concrete under sustained loads causes an increase in deflection with time.
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Design Process Design Process Phase 1 : Definition of clients’ needs and priorities. Functional requirements Aesthetic requirements Budgetary requirements
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Design Process Design Process Phase 2 : Development of project concept Develop possible layouts Approximate analysis preliminary members sizes/cost for each arrangement
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Design Process Design Process Phase 2 : Development of project concept Selection most desirable structural system Appropriateness Economical/Cost Maintainability
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Design Process Design Process Phase 3 : Design of individual system Structural analysis (based on preliminary design) Moments Shear forces Axial forces
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This note was uploaded on 04/02/2008 for the course CEN 444 taught by Professor Ehsani during the Spring '08 term at Arizona.

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03Fundamentals - Lecture 3 - Fundamentals September 6, 2002...

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