Influence of buckling of longitudinal reinforcement in columns on seismic response of existing reinforced concrete bridges : doctoral thesis = Vpliv uklona vzdolžne armature stebrov na potresni odziv obstoječih armiranobetonskih mostov : doktorska disertacija
Anžlin, Andrej, gradbenik
Experimental and analytical studies of the in uence of the buckling in the longitudinal reinforcement on the seismic response of existing concrete bridge columns were performed. Based on the previous ...tests of typical I-shaped bridge piers the design of new cyclic tests of rectangular columns was performed. The impact of the inappropriate seismic detailing and the in uence of the concrete cover on the drift and load-carrying capacity as well as on the buckling of bars was analysed. After the literature review the data of 63 experimental tests of RC columns were collected in which the collapse of the element was mainly navigated by the local or global buckling of bars. They were all included into newly established `buckling' database. With the aid of the new database the new analytical form for the estimation of the post-capping stifiness of rectangular columns was introduced. All columns from the `buckling' database were analysed with existing engineering macro models, which are usually used for the seismic analysis of RC structures. It was concluded, that for the rectangular RC columns with inadequate seismic detailing many times principal assumptions were not fulflled. Therefore, their improvement was proposed. New procedure for estimation of the inappropriate hook angles of lateral reinforcement and buckled bars on confnement efiectiveness was analytically derived. It based with several detailed FE analyses of concrete columns with diferent reinforcement detailing configurations. The experimental tests of the strengthened RC columns were performed. At first, the efciency of strengthening of the typcal I-shape bridge pier with substandard reinforcement was verified by means of CFRP wrap. It was concluded, that due to the unfavourable aspect ratio of the section anges the conventional strengthening is rather inefective. Based on these findings improved strengthening of substandard rectangular columns was considered. The columns was jacketed with pre-stressed CFRP fibres, the concrete cover was removed and smoothed with epoxy resin, the column corners were rounded to largest possible level. In this way, the deformation capacity of columns was increased for more than 70 %. The strengthened columns with defcient structural details were analysis with similar numerical models as previously described columns. For this type of RC members the modifications of the existing numerical models were also proposed.
Type of material - dissertation
; adult, serious
Publication and manufacture - Ljubljana : [IA. Anžlin], 2017
Faculty of Civil and Geodetic Engineering, Ljubljana
Centralna knjižnica na Jamovi 043.3 ANŽLIN A. Vpliv IN: 520170006
available - outside loan, loan period: 1 months
Faculty of Civil and Geodetic Engineering, Ljubljana
Centralna knjižnica na Jamovi Č 043.3 ANŽLIN A. Vpliv IN: 520170005
available - reading room
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