Support condition of a connecting member to existing structure
Support condition of a connecting member to existing structure
(OP)
Hi All,
I am just curious what support condition will you have if for example you will add a beam to an existing structure and it will be supported by an existing beam. usually i do pinned at both ends because its hard to develop moments when drilling and putting in dowel bars on the existing beam. but in a sense it should not be pinned right? because my support will actually deflect due to application of loads.
same goes when adding an additional floor, i will use steel and place it on top of an existing column, but i think using a pinned assumption for this case is a bit realistic because the settlement of the column will be very small, except of course that it will sway when lateral loads are applied.
I am just wondering how others assign their support condition in those two situations.
replies will be much appreciated
I am just curious what support condition will you have if for example you will add a beam to an existing structure and it will be supported by an existing beam. usually i do pinned at both ends because its hard to develop moments when drilling and putting in dowel bars on the existing beam. but in a sense it should not be pinned right? because my support will actually deflect due to application of loads.
same goes when adding an additional floor, i will use steel and place it on top of an existing column, but i think using a pinned assumption for this case is a bit realistic because the settlement of the column will be very small, except of course that it will sway when lateral loads are applied.
I am just wondering how others assign their support condition in those two situations.
replies will be much appreciated






RE: Support condition of a connecting member to existing structure
RE: Support condition of a connecting member to existing structure
only time i use spring support is for piles.
RE: Support condition of a connecting member to existing structure
RE: Support condition of a connecting member to existing structure
RE: Support condition of a connecting member to existing structure
I usually encounter this on additions on existing structure, like mezzanines or expansion of an existing structure.
@ Delagina /ahmmed
For example I have a steel frame connecting in an existing RC structure. so that my new Steel beam will be supported by an RC beam on one end and a steel column/beam in another end. If i assumed the point of support on the RC beam to be pinned, theoretically that would be incorrect right? because the RC beam will have some displacement, so i have to make my support as a spring. how will you calculate the spring stiffness of that support?
RE: Support condition of a connecting member to existing structure
It's a pretty theoretical discussion. Assuming similar supporting conditions on each end (usually the case), the deflection will be similar and you'll end up with a pinned connection on each end.
RE: Support condition of a connecting member to existing structure