I have a 20+ y/o townhouse. The main floor is supported by end-to-end trusses constructed of 2x4s at top and bottom with 2x4 criss-cross supports all held together by press-on braces. One day a while back I noticed that virtually all the trusses' braces where the bottom pieces were attached to each other were popping off and the boards were misaligned. I bought some steel pieces and used them to hold the braces in place with bolts but I am concerned as to the fix and why the trusses would fail. I need expert advice.
I'd upload the images but even though they are proper jpg files, the system says they are not valid:
Note the connecting pieces have bent and come away from the trusses. While this is the worst, it happened on almost all the trusses.
I put a piece of steel on each side both top and bottom and bolted through the 2x4. Basically, they hold the original braces tight up to the 2x4 to prevent the original braces from coming apart. They do not add any strength since the steel pieces (not shown since these are "before" pics) do not cross the 2x4s or hold them together.
What would have caused the problem? I see no problems on the upper 2x4. All the ~46' long trusses rest on the foundation at both ends and rest on a triple 2x10 crossbeam ~32' from one end and ~14' from the other.