04Fundamentals

04Fundamentals - Lecture 4 Fundamentals September 9 2002...

This preview shows pages 1–15. Sign up to view the full content.

Lecture 4 - Fundamentals Lecture 4 - Fundamentals September 9, 2002 CVEN 444

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Lecture Goals Lecture Goals Loading (continued) Concrete Mixing and Proportioning Concrete Properties Steel Reinforcement
Earthquake Loads Earthquake Loads Inertia forces caused by earthquake motion F = m * a Distribution of forces can be found using equivalent static force procedure (code, not allowed for every building) or using dynamic analysis procedures

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Earthquake Loads Earthquake Loads Inertia forces caused by earthquake motion. Equivalent Static Force Procedure for example, in ASCE 7-95: V = C s * W where V = Total lateral base shear C s = Seismic response coefficient W = Total dead load

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Earthquake Loads Earthquake Loads where C v = Seismic coefficient based on soil profile and A v C a = Seismic coefficient based on soil profiled and A a R = Response modification factor (ability to deform in inelastic range) T = Fundamental period of the structure R C and T R C of smaller C a v s 5 . 2 2 . 1 3 / 2 =
Earthquake Loads Earthquake Loads where T = Fundamental period of the structure T = C T h n 3/4 where C T = 0.030 for MRF of concrete 0.020 for other concrete buildings. h n = Building height R C and T R C of smaller C a v s 5 . 2 2 . 1 3 / 2 =

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Earthquake Map Earthquake Map
Roof Loads Roof Loads Ponding of rainwater Roof must be able to support all rainwater that could accumulate in an area if primary drains were blocked. Ponding Failure: Rain water ponds in area of maximum deflection increases deflection allows more accumulation of water cycle continues… potential failure

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Construction Loads Construction Loads Construction materials Weight of formwork supporting weight of fresh concrete

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Concrete Mixing and Proportioning Concrete Mixing and Proportioning Concrete : Composite material composed of portland cement, fine aggregate (sand), coarse aggregate (gravel/stone), and water; with or without other additives. Hydration : Chemical process in which the cement powder reacts with water and then sets and hardens into a solid mass, bonding the aggregates together
Concrete Mixing and Proportioning Concrete Mixing and Proportioning Heat of Hydration : Heat is released during the hydration process. In large concrete masses heat is dissipated slowly temperature rises and volume expansion later cooling causes contraction. Use special measures to control cracking.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Concrete Mixing and Proportioning Concrete Mixing and Proportioning 1. Proportioning : Goal is to achieve mix with Adequate strength Proper workability for placement
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 64

04Fundamentals - Lecture 4 Fundamentals September 9 2002...

This preview shows document pages 1 - 15. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online