000012178 001__ 12178
000012178 005__ 20141205160027.0
000012178 04107 $$aeng
000012178 046__ $$k2008-10-12
000012178 100__ $$aYan, Zihan
000012178 24500 $$aSeismic Retrofit of Bridge Columns Using Fiber Reinforced Polymer Composite Shells and Shape Modification

000012178 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000012178 260__ $$b
000012178 506__ $$arestricted
000012178 520__ $$2eng$$aFiber Reinforced Polymer (FRP) composites can provide effective confinement to circular concrete columns for the purpose of seismic retrofit of bridges. However, the retrofit effectiveness of FRP confinement for square and rectangular columns is greatly reduced due to the flat sides and sharp corners. Shape modification is a possible approach for eliminating the effects of column corners and flat sides, thereby restoring the membrane effect and improving the compressive behavior of FRP-confined square and rectangular concrete columns. An effective method for performing shape modification with FRP composites is to use prefabricated (non-bonded) FRP composite shells with expansive cement concrete. A prefabricated elliptical/oval/circular FRP shell may be used as stay-in-place formwork for casting additional expansive cement concrete around the column with a square or rectangular cross-section to achieve shape modification. The restraint of the expansion caused by hydration of the component of expansive cement induces the active confinement pressure. Large-scale experimental results have shown that shape-modification using expansive cement concrete can achieve a higher axial compressive strength and ductility for modified square and rectangular columns compared to the original columns with the same number of FRP composite layers. An analytical model was developed to determine the stress-strain behavior of shape-modified columns with expansive cement concrete. In addition, a parametric study for the practical use of shape modification is carried out.

000012178 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000012178 653__ $$aAxial stress, Axial strain, Confinement, Ductility, Expansive cement concrete, Fiber reinforced polymers (FRP), Seismic retrofit.

000012178 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000012178 720__ $$aYan, Zihan$$iPantelides, Chris P.$$iReaveley, Lawrence D.
000012178 8560_ $$ffischerc@itam.cas.cz
000012178 8564_ $$s122709$$uhttps://invenio.itam.cas.cz/record/12178/files/05-02-0041.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 05-02-0041.
000012178 962__ $$r9324
000012178 980__ $$aPAPER