Problem $1.$ For the $9-$node structure in figure:

a$.$ How many braces must be added to the roof

to make it a statically determinate $($non$-$deformable$),$

plane truss? Sketch on figure the

braces you add. Also show a set of external

supports that would render the roof truss

stable in $2$D$.$

b$.$ How many braces must be added to the walls

to make the entire structure stable and

statically determinate? Sketch on figure the

braces you addProblem $1.$ For the $9-$node structure in figure:

a$.$ How many braces must be added to the roof

to make it a statically determinate $($non$-$

deformable$),$ plane truss? Sketch on figure the

braces you add. Also show a set of external

supports that would render the roof truss

stable in $2D.$

b$.$ How many braces must be added to the walls

to make the entire structure stable and

statically determinate? Sketch on figure the

braces you add