000018615 001__ 18615
000018615 005__ 20170118182230.0
000018615 04107 $$aeng
000018615 046__ $$k2017-01-09
000018615 100__ $$aTarantino, Angelo
000018615 24500 $$aSeismic Damaged Chinese RC Bridges Repaired and Retrofitted By Rapid Intervention To Improve Plastic Dissipation and Shear Strength

000018615 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018615 260__ $$b
000018615 506__ $$arestricted
000018615 520__ $$2eng$$aIn this paper, Chinese rc (reinforced concrete) bridges piers damaged after a strong earthquake, were repaired and retrofitted by means of some innovative interventions which guarantee the proper plastic dissipation in plastic hinge only and the shear strength improvement according to capacity design criteria. In particular, the repair and retrofitting techniques proposed and tested with very good results during previous experimental researches on Italian [4] or Chinese bridges [5], which were designed without proper seismic details (i.e. very modest shear strength), are upgraded. The upgrades consist in: new shaped rebar parts to substitute the damaged rebar parts, new strong connection systems to connect the new rebar parts to the undamaged original rebar parts and new concrete jacket built by means of Ultra High performance concrete (UHPC) with fibers which replace the damaged concrete parts and can guarantee the necessary pier shear strength improvement. The new shaped rebar parts are designed to assure the plastic dissipation along the new rebar parts only. The rebar connection systems are realized by strong steel couplers and welding chords to simplify the connection in situ. The concrete jacket was built by UHPC considering different fiber contents (1, 2 or 3%). The experimental results about these materials confirm that a concrete jacket with fibers can provide the necessary shear strength according to CNR-DT 204/2006 formulations [21]. Some rc pier specimens (scale 1:6) were repaired and retrofitted by means of the proposed interventions with and without new stirrups in the repaired zone and external wrapping (CFRP or steel). Cyclic tests will be carried out on these scaled specimens at Fuzhou University SIBERC lab (China) to evaluate the effectiveness of the proposed technique. In particular, the experimental tests on the pier specimens repaired by using the UHPC jacket with fiber without new stirrups and external wrapping could confirm if the concrete jacket only can assure the necessary shear strength increment to obtain time and cost saving.

000018615 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018615 653__ $$aFiber reinforced concrete, shaped rebar, c-frp, steel wrapping, repair, retrofitting

000018615 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018615 720__ $$aTarantino, Angelo$$iBergami, Alessandro Vittorio$$iXue, Junqing$$iNuti, Camillo$$iLavorato, Davide$$iSantini, Silvia$$iBriseghella, Bruno$$iHuang, Yufan
000018615 8560_ $$ffischerc@itam.cas.cz
000018615 8564_ $$s297669$$uhttps://invenio.itam.cas.cz/record/18615/files/1845.pdf$$yOriginal version of the author's contribution as presented on USB, paper 1845.
000018615 962__ $$r16048
000018615 980__ $$aPAPER