Transcription of Lecture – 1 Design Philosophy
{{id}} {{{paragraph}}}
Example: stock market
Lecture – 1 Design Philosophy
Lecture 1 Design Philosophy Working Stress Method of Design Concrete is strong in compression and crushing strength is determined by test on standard cubes. Large deformation is noticed at the failure load. Deformation is permanent in nature. This suggests for the adoption of a factor of safety. Permissible bending & direct compression are as fraction of crushing strength. For example: M15 concrete, the value of cbc = 5 = (15/3) and cc = 4 = (15 ) Assumptions in working stress method 1. Plane section before bending will remain plane after bending. 2. Stress-strain relations obey Hooks law (linear) 3. Tensile stresses are taken by steel only. =csEEmcbc 3280= m not as 4. The Modular ratio5. cbf= Compressive stress of concrete; cbc =Permissible stress of concrete; stf = Tensile stress in steel ; st = Permissible stress of concrete 2 Limit State Method of Design This is based on the behavior of structure at different limit states ensuring adequate safety against each limitation.
4 Balanced section: Compression strain in concrete = 0.0035 Tensile strain in steel = yield strain Under Reinforced Section: Compression strain in concrete < 0.0035
Loading..
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document:
Related search queries
Moment Resisting Frames with Infill Panels, Frames, Bracing Systems for Seismic Retrofitting of Steel, BRACING SYSTEMS FOR SEISMIC RETROFITTING OF STEEL FRAMES, UNRESTRAINED BEAM DESIGN – II, Steel, UNRESTRAINED BEAM DESIGN-II, Effective, BOLTED CONNECTIONS – I, Consideration of Slenderness Effect in, Seismic Load Analysis