ENGR. JOSEPH FRANK A. NAGAL

STRUCTURAL THEORY I

CENGR 412

IntroductionStructural Analysis – is the prediction of the performance of a given structure under prescribed loads.

Structural Engineering has long been a part of human endeavor, but Galileo is considered to be the originator of the theory of structures.

The objective of a structural engineer is to design a structure that will be able to withstand all the loads to which it is subjected while serving its intended purpose throughout its intended life span.

Structural engineering is the science of planning, designing, and constructing safe, economical structures. Structural analysis is an integral part of this process.

Civil Engineer - is a professional engineering discipline that deals with the design, construction, and maintenance of the physical and naturally built environment, including works like roads, bridges, canals, dams, and buildings.

Eiffel Tower

Named after the engineer Gustave Eiffel, whose company designed and built the tower.

Engineer Joke

"Architects and engineers are among the most fortunate of men since they build their own monuments with public consent, public approval, and often

- John Prebble

public money. "

6 Specialty Divisions of Civil Engineering

Structural engineering - is a field of engineering dealing with the analysis and design of structures that support or resist loads. 

6 Specialty Divisions of Civil Engineering

Geotechnical engineering is the branch of civil engineering concerned with the engineering behavior of earth materials. 

6 Specialty Divisions of Civil Engineering

 Transportation engineering is the application of technology and scientific principles to the planning, functional design, operation and management of facilities for any mode of transportation in order to provide for the safe, efficient, rapid, comfortable, convenient, economical, and environmentally compatible movement of people and goods (transport). 

6 Specialty Divisions of Civil Engineering

 Water engineering as a sub-discipline of civil engineering is concerned with the flow and conveyance of fluids, principally water and sewage.  

6 Specialty Divisions of Civil Engineering

 

Project management and Construction engineering is a professional discipline that deals with the designing, planning, construction, and management of infrastructures such as highways, bridges, airports, railroads, buildings, dams, and utilities.

6 Specialty Divisions of Civil Engineering

Environmental and Energy engineering is the integration of science and engineering principles to improve the natural environment (air, water, and/or land resources), to provide healthy water, air, and land for human habitation (house or home) and for other organisms, and to remediate pollution sites. 

Reinforced concrete design

Timber design

Pre-stressed concrete design

Steel design

Structural theory

Role of Structural Analysis in Structural Engineering Projects

Planning phase

Preliminary structural design

Estimation of loads

Construction phase

Structural analysis

Revised structural

design

Are the safety and serviceability requirements

satisfied?

yes

no

Involves establishment of the functional requirements

Sizes of the various members of the structural system selectedin the planning phase are estimated based on approximate analysis, past experience, & code requirements.

Involves determination of all loads that can be expected to act on the structure.

Values of the loads are used to carry out an analysis of thestructure in order to determine the stresses or stress resultantsin the members & the deflections at various points of the structure,.

Results of the analysis are used to determine whether or notthe structures satisfies the safety & serviceability requirementsof the design codes.