Check out Steel structure frame 3D model on CGTrader for $2. High-quality mesh by JindaArch. PBR, Textured.
BLEND (Blender, filesize: 23.6 MB), OBJ (OBJ, filesize: 8.34 MB), FBX (Autodesk FBX, filesize: 7.77 MB), MAX (Autodesk 3ds Max, filesize: 23.2 MB), GLTF (glTF, filesize: 10.2 MB), STL (Stereolithography, filesize: 6.61 MB), DXF (DXF, filesize: 41.2 MB), DAE (Collada, filesize: 10.2 MB)