| 摘要 |
<p>A lattice type girder has upper and lower chords between which extend inclined struts. The struts may be of continuous zig-zag form with interconnected sections. The ends of the struts or strut sections are received in recesses in the chords and secured therein by a hardening and binding substance, such as urethane plastics or epoxy glue. This substance fills the recesses and preferably has the same compressive and tensile strength as the material of the chords.</p> |
