>>13170510>yield strengthThat picture compares tangent elastic modulus to initial elastic modulus, i.e., it describes a loss of stiffness.
In statically indeterminate systems, stiffness of course affects the capacity indirectly, since loss of stiffness causes redistribution of internal forces to more stiff members.
>>13169639Steel is adversely affected by high temperatures. You don't need to melt a beam to reduce its capacity enough to cause it to break.
