Even if one or a set of structural member in building structures disappears suddenly due to accidental loads, the building should stand against vertical gravity loads, dead or live. This study investigates the structural redundancy and the effects of catenary action based on another resistant mechanism after failure mechanism formation. In this paper, the ultimate resistant mechanism of framed structures is investigated experimentally and analytically. The static loading tests have been conducted. From the comparison with analytical results, the non-linear push-down analysis shows good agreements with test result. Furthermore, the limit analysis based on the upper boundary theory is proposed.
