BUCKLING CHARACTERISTICS OF RIGIDLY JOINTED SINGLE-LAYER LATTICED DOMES SUBJECTED TO A CONCENTRATED LOAD AND EXTERNAL PRESSURE THE IMPERFECTION EFFECT ON ELASTIC BUCKLING CHARACTERISTICS

摘要

On the elastic buckling characteristics of rigidly jointed single-layer latticed domes with triangular networks subjected to a concentrated load and external pressure, the imperfection effect caused by the concentrated load on the global buckling strength, and the combined effects of the deflection caused by the concentrated load and the geometrical initial imperfection have been examined experimentally. Under combined loading of the concentrated load at the apex node with external pressure, bifurcation-type the global buckling or snap-through-type the local buckling occurs. The influence of the geometrical initial imperfection on the local buckling for the concentrated load is small. The concentrated load which brings about the global buckling with the external pressure has little influence on the global buckling strength. But the global buckling strength decreases, only when the compressive member-force and/or the local deflection caused by the concentrated load corresponds to the initial imperfection which may have a great influence on the global buckling for the external pressure loading.