000009879 001__ 9879
000009879 005__ 20141205153203.0
000009879 04107 $$aeng
000009879 046__ $$k2008-10-12
000009879 100__ $$aDing, Weihua
000009879 24500 $$aStudy on Dynamic Damage Process of Concrete Based on X-Ray CT Technique

000009879 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000009879 260__ $$b
000009879 506__ $$arestricted
000009879 520__ $$2eng$$aResearch on the strength and the failure mechanism of concrete under dynamic loading is a weak point in seismic safety assessment for concrete structures. X-ray computed tomography (CT) technique is a useful tool to detect the process of the initiation, propagation and continuous accumulation of interior micro damage leading to macro crack and finally to the complete failure of concrete by non-destructive way. A portable test device for dynamic tensile and compressive loading specially designed to fit the conventiona l medical CT scanner has been manufactured. Based on the medical CT scanning system and the special designed and manufactured portable test device the static and dynamic real time CT tests for concrete specimens under compressive loading have been carried out. The provided CT images verified the expected requirements to the designed CT test system. The difference of cracking process between the static and dynamic compression loading conditions was investigated in detail. In high strain rate, concrete fracturing points increase and mesocrack seems straight. The phenomenon that crack cut across aggregate grows. So concrete dynamic strength can increase. The preliminary results prepared the ground for setting the crack evolution models of concrete under different loading conditions. In order to intuitively demonstrate the crack morphology character and crack evolution process during the loading, the formation of 3D images and the animated cartoons displaying technique of the crack development by using the CT test results have been completed using 3DMAX software. All the abovementioned research works have brought forth some new ideals in the study on dynamic behavior of concrete for evaluation seismic safety of concrete structures.

000009879 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000009879 653__ $$aConcrete, CT technique, meso-mecha nics level, formation of 3D ima ges, failure process

000009879 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000009879 720__ $$aDing, Weihua$$iChen, Houqun$$iDang, Fangning$$iLiu, Shaocong
000009879 8560_ $$ffischerc@itam.cas.cz
000009879 8564_ $$s1689043$$uhttps://invenio.itam.cas.cz/record/9879/files/12-01-0273.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 12-01-0273.
000009879 962__ $$r9324
000009879 980__ $$aPAPER