A Computational Analysis of Old RC Structures Strengthened by Ties Under Removal of Members
Апстракт
In existing old reinforced concrete (RC) buildings, some structural element-members, e.g. columns, are
sometimes removed due to various reasons. These reasons can concern changes of serviceability and
requirements, or environmental effects, e.g. corrosion, earthquakes, which cause strength degradation
etc. In such cases, a modification of the structural response and a redistribution of internal actions can
result to a requirement for strengthening the remaining structure. The present study deals with such a
case, which concerns the computational analysis of framed RC structures under the removal of some
columns and the so-induced requirement of a strengthening by cable-ties (tension only elements). These
cable-ties can undertake tension but buckle and become slack and structurally ineffective when
subjected to a sufficiently large compressive force. Thus the problem governing conditions take an
equality as well as an inequality form and the problem becomes a high non-linear on...e. The problem of
structures containing as above cable-like members belongs to the so-called Inequality Problems of
Mechanics, as their governing conditions are of both, equality and inequality type. A realistic numerical
treatment of such problems can be obtained by mathematical programming methods (optimization
algorithms). Here, and taking into account all the non-linearities concerning the cable and the RC
elements behavior, a computational approach based on an incremental problem formulation is
appropriately applied. Finally, an application is presented for a simple typical example of an industrial
RC frame strengthened by bracing ties after the removal of some ground floor columns.
Кључне речи:
Old RC structures / computational structural mechanics / removal of columns / strengthening by tiesИзвор:
PROCEEDINGS 18th INTERNATIONAL SYMPOSIUM OF MASE, 2019, 337-342Издавач:
- Skopje : MASE - Macedonian Association of Structural Engineers
Напомена:
- PROCEEDINGS 18th INTERNATIONAL SYMPOSIUM OF MASE ЗБОРНИК НА ТРУДОВИ 18th МЕЃУНАРОДЕН СИМПОЗИУМ НА ДГКМ Editor: Meri Cvetkovska, President of MASE За издавачот: Мери Цветковска, Претседател на ДГКМ Ohrid, North Macedonia, 2 – 5 October 2019 Охрид, Северна Македонија, 2 – 5 Октомври 2019
Колекције
Институција/група
Inovacioni centarTY - CONF AU - LIOLIOS, A. AU - Hatzigeorgiou, G. AU - Liolios, K. AU - Partov, D AU - Folić, Boris PY - 2019 UR - https://machinery.mas.bg.ac.rs/handle/123456789/6985 AB - In existing old reinforced concrete (RC) buildings, some structural element-members, e.g. columns, are sometimes removed due to various reasons. These reasons can concern changes of serviceability and requirements, or environmental effects, e.g. corrosion, earthquakes, which cause strength degradation etc. In such cases, a modification of the structural response and a redistribution of internal actions can result to a requirement for strengthening the remaining structure. The present study deals with such a case, which concerns the computational analysis of framed RC structures under the removal of some columns and the so-induced requirement of a strengthening by cable-ties (tension only elements). These cable-ties can undertake tension but buckle and become slack and structurally ineffective when subjected to a sufficiently large compressive force. Thus the problem governing conditions take an equality as well as an inequality form and the problem becomes a high non-linear one. The problem of structures containing as above cable-like members belongs to the so-called Inequality Problems of Mechanics, as their governing conditions are of both, equality and inequality type. A realistic numerical treatment of such problems can be obtained by mathematical programming methods (optimization algorithms). Here, and taking into account all the non-linearities concerning the cable and the RC elements behavior, a computational approach based on an incremental problem formulation is appropriately applied. Finally, an application is presented for a simple typical example of an industrial RC frame strengthened by bracing ties after the removal of some ground floor columns. PB - Skopje : MASE - Macedonian Association of Structural Engineers C3 - PROCEEDINGS 18th INTERNATIONAL SYMPOSIUM OF MASE T1 - A Computational Analysis of Old RC Structures Strengthened by Ties Under Removal of Members EP - 342 SP - 337 UR - https://hdl.handle.net/21.15107/rcub_machinery_6985 ER -
@conference{ author = "LIOLIOS, A. and Hatzigeorgiou, G. and Liolios, K. and Partov, D and Folić, Boris", year = "2019", abstract = "In existing old reinforced concrete (RC) buildings, some structural element-members, e.g. columns, are sometimes removed due to various reasons. These reasons can concern changes of serviceability and requirements, or environmental effects, e.g. corrosion, earthquakes, which cause strength degradation etc. In such cases, a modification of the structural response and a redistribution of internal actions can result to a requirement for strengthening the remaining structure. The present study deals with such a case, which concerns the computational analysis of framed RC structures under the removal of some columns and the so-induced requirement of a strengthening by cable-ties (tension only elements). These cable-ties can undertake tension but buckle and become slack and structurally ineffective when subjected to a sufficiently large compressive force. Thus the problem governing conditions take an equality as well as an inequality form and the problem becomes a high non-linear one. The problem of structures containing as above cable-like members belongs to the so-called Inequality Problems of Mechanics, as their governing conditions are of both, equality and inequality type. A realistic numerical treatment of such problems can be obtained by mathematical programming methods (optimization algorithms). Here, and taking into account all the non-linearities concerning the cable and the RC elements behavior, a computational approach based on an incremental problem formulation is appropriately applied. Finally, an application is presented for a simple typical example of an industrial RC frame strengthened by bracing ties after the removal of some ground floor columns.", publisher = "Skopje : MASE - Macedonian Association of Structural Engineers", journal = "PROCEEDINGS 18th INTERNATIONAL SYMPOSIUM OF MASE", title = "A Computational Analysis of Old RC Structures Strengthened by Ties Under Removal of Members", pages = "342-337", url = "https://hdl.handle.net/21.15107/rcub_machinery_6985" }
LIOLIOS, A., Hatzigeorgiou, G., Liolios, K., Partov, D.,& Folić, B.. (2019). A Computational Analysis of Old RC Structures Strengthened by Ties Under Removal of Members. in PROCEEDINGS 18th INTERNATIONAL SYMPOSIUM OF MASE Skopje : MASE - Macedonian Association of Structural Engineers., 337-342. https://hdl.handle.net/21.15107/rcub_machinery_6985
LIOLIOS A, Hatzigeorgiou G, Liolios K, Partov D, Folić B. A Computational Analysis of Old RC Structures Strengthened by Ties Under Removal of Members. in PROCEEDINGS 18th INTERNATIONAL SYMPOSIUM OF MASE. 2019;:337-342. https://hdl.handle.net/21.15107/rcub_machinery_6985 .
LIOLIOS, A., Hatzigeorgiou, G., Liolios, K., Partov, D, Folić, Boris, "A Computational Analysis of Old RC Structures Strengthened by Ties Under Removal of Members" in PROCEEDINGS 18th INTERNATIONAL SYMPOSIUM OF MASE (2019):337-342, https://hdl.handle.net/21.15107/rcub_machinery_6985 .