1 What is the difference between safety and serviceability C

1) What is the difference between safety and serviceability? Can a structure be safe but
fail due to serviceability?
2) Describe what a material property is? Is tensile stress a material property? Is
deformation a material prop.? Is tensile strain a mat. prop? Is tensile strength a mat.
prop.? Is Young’s modulus a mat. prop? Ductility? Temperature? Thermal expansion
coefficient? Density? Toughness? Resilience?
3) Give two examples of mechanical properties.
4) Give one example each of thermal, chemical, physical, electrical properties.
5) What is durability? How can you relate durability to the lifetime of a
material/structure? How can you relate durability to the sustainability of a structure?
6) Name two or more organizations that prepare and publish standard specifications.
7) When buying a material from a producer, how does a standard protect the buyer? How
does it protect the producer/seller?
8) After deciding to use a particular material in your project, and you identify a seller of
that material, what reason would you have to test the material using a standard test?
9) If you observe that the measured tensile strength of your material is lower than the
strength published in books or promised by the producer, what could be some
reasons/problems (known or unknown, accidentakl or intentional) that led to this
difference?
Study questions related to Material Behavior Under Load
1) A material under tensile load will get............... (longer/shorter)?
2) What type of loas is need to tear a piece of paper? Can you tear/fail paper using
tension? Using shear?
3) Which of the following are static/dynamic loads? Car on a bridge? The load on the
column of a building? A meteorite falling on a roof? Wind load on the side of a
building? Earthquake load on a building? Snow load?
4) Can a static load cause creep failure?
5) Can a static load cause fatigue failure?
6) Metals (metallic bonds) bend before breaking but ceramics (mostly ionic bonds) break
without bending. Why?
7) Give one example of an isotropic construction material.
8) Give one example of an anisotropic construction material.
9) When building a column with an anisotropic material, what problems may arise or
what do you need to control to make sure the column behaves as expected in the
design?

Solution

1) Safety of a structure is assured with the strength of the structure. If the structure is able to withstand the design loads,then it is considered safe. Safe structure is one which doesn\'t fail/collapse when loads are applied.Safety of a structure is directly related to strength of the structure.

Serviceability of a structure is associated with the deformation/deflections the structure sees due to service level loads. If the structure undergoes a lot of deformation(even though the structure doesn\'t fail), the occupants feel uncomfortable and unsafe because of those high deformations.Serviceability of a structure is directly related to stiffness of a structure.

Yes,it is possible for a structure to be safe but fail serviceability. If we consider a long span beam, there might be scenario wherein the strength of the beam is adequate to resist the loads. However, it is seeing high deflections.