TY - JOUR N2 - The paper presents the method of probabilistic optimisation of load bearing capacity and reliability of statically indeterminate bar structures, and of coupling of members in kinematically admissible failure mechanisms (KAFM), which contain minimal critical sets of elements (MCSE). The latter are characterised by the fact that if only a single element is operational, the whole set is operational too. A method of increasing load bearing capacity and reliability of KAFM built from bars dimensioned in accordance with the code is presented. The paper also shows estimation of load bearing capacity and reliability of KAFM of the optimised structures containing elastic-plastic bars with quasi-brittle connections with nodes. The necessity of increasing connection of load bearing capacity and reliability in relation to bar reliability in order to prevent bars from being excluded from MCSE due to connection fracture is estimated. L1 - http://journals.pan.pl/Content/83922/mainfile.pdf L2 - http://journals.pan.pl/Content/83922 PY - 2014 IS - No 1 EP - 90 KW - load bearing capacity KW - reliability KW - probabilistic optimisation KW - complex structures A1 - Kowal, Z. PB - WARSAW UNIVERSITY OF TECHNOLOGY FACULTY OF CIVIL ENGINEERING and COMMITTEE FOR CIVIL ENGINEERING POLISH ACADEMY OF SCIENCES DA - 31.03.2014 T1 - Instruments of probabilistic optimisation of load bearing capacity and reliability of statically indeterminate complex structures SP - 77 UR - http://journals.pan.pl/dlibra/publication/edition/83922 T2 - Archives of Civil Engineering ER -