TY  - JOUR
A1  - Becker, Meike
A1  - Frauenrath, Tobias
A1  - Hezel, Fabian
A1  - Krombach, Gabriele A.
A1  - Kremer, Ute
A1  - Koppers, Benedikt
A1  - Butenweg, Christoph
A1  - Goemmel, Andreas
A1  - Utting, Jane F.
A1  - Schulz-Menger, Jeanette
A1  - Niendorf, Thoralf
T1  - Comparison of left ventricular function assessment using phonocardiogram- and electrocardiogram-triggered 2D SSFP CINE MR imaging at 1.5 T and 3.0 T
JF  - European Radiology
N2  - Objective: As high-field cardiac MRI (CMR) becomes more widespread the propensity of ECG to interference from electromagnetic fields (EMF) and to magneto-hydrodynamic (MHD) effects increases and with it the motivation for a CMR triggering alternative. This study explores the suitability of acoustic cardiac triggering (ACT) for left ventricular (LV) function assessment in healthy subjects (n=14). Methods: Quantitative analysis of 2D CINE steady-state free precession (SSFP) images was conducted to compare ACT’s performance with vector ECG (VCG). Endocardial border sharpness (EBS) was examined paralleled by quantitative LV function assessment. Results: Unlike VCG, ACT provided signal traces free of interference from EMF or MHD effects. In the case of correct Rwave recognition, VCG-triggered 2D CINE SSFP was immune to cardiac motion effects—even at 3.0 T. However, VCG-triggered 2D SSFP CINE imaging was prone to cardiac motion and EBS degradation if R-wave misregistration occurred. ACT-triggered acquisitions yielded LV parameters (end-diastolic volume (EDV), endsystolic volume (ESV), stroke volume (SV), ejection fraction (EF) and left ventricular mass (LVM)) comparable with those derived fromVCG-triggered acquisitions (1.5 T: ESVVCG=(56± 17) ml, EDVVCG=(151±32)ml, LVMVCG=(97±27) g, SVVCG=(94± 19)ml, EFVCG=(63±5)% cf. ESVACT= (56±18) ml, EDVACT=(147±36) ml, LVMACT=(102±29) g, SVACT=(91± 22) ml, EFACT=(62±6)%; 3.0 T: ESVVCG=(55±21) ml, EDVVCG=(151±32) ml, LVMVCG=(101±27) g, SVVCG=(96±15) ml, EFVCG=(65±7)% cf. ESVACT=(54±20) ml, EDVACT=(146±35) ml, LVMACT= (101±30) g, SVACT=(92±17) ml, EFACT=(64±6)%). Conclusions: ACT’s intrinsic insensitivity to interference from electromagnetic fields renders
KW  - Magnetic resonance imaging (MRI)
KW  - MR-stethoscope
KW  - Magnetic field strength
KW  - Left ventriular function
KW  - Cardiovascular MRI
Y1  - 2010
U6  - http://dx.doi.org/10.1007/s00330-009-1676-z
SN  - 1432-1084 (Onlineausgabe)
SN  - 0938-7994 (Druckausgabe)
VL  - 20
SP  - 1344
EP  - 1355
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Holler, S.
A1  - Butenweg, Christoph
A1  - Noh, S.-Y.
A1  - Meskouris, Konstantin
T1  - Computational model of textile-reinforced concrete structures
JF  - Computers & structures : an international journal
Y1  - 2004
U6  - http://dx.doi.org/10.1016/j.compstruc.2004.03.076
SN  - 1879-2243 (E-Journal); 0045-7949 (Print)
VL  - Volume 82
IS  - Issues 23-26
SP  - 1971
EP  - 1979
ER  - 
TY  - CHAP
A1  - Butenweg, Christoph
A1  - Marinkovic, Marko
T1  - Damage reduction system for masonry infill walls under seismic loading
T2  - ce/papers
N2  - Reinforced concrete (RC) frames with masonry infills are frequently used in seismic regions all over the world. Generally masonry infills are considered as nonstructural elements and thus are typically neglected in the design process. However, the observations made after strong earthquakes have shown that masonry infills can modify the dynamic behavior of the structure significantly. The consequences were total collapses of buildings and loss of human lives. This paper presents the new system INODIS (Innovative Decoupled Infill System) developed within the European research project INSYSME (Innovative Systems for Earthquake Resistant Masonry Enclosures in RC Buildings). INODIS decouples the frame and the masonry infill by means of special U-shaped rubbers placed in between frame and infill. The effectiveness of the system was investigated by means of full scale tests on RC frames with masonry infills subjected to in-plane and out-of-plane loading. Furthermore small specimen tests were conducted to determine material characteristics of the components and the resistances of the connections. Finally, a micromodel was developed to simulate the in-plane behavior of RC frames infilled with AAC blocks with and without installation of the INODIS system.
KW  - earthquakes
KW  - in-plane and out-of-plane failure
KW  - INODIS
KW  - RC frames
Y1  - 2018
U6  - http://dx.doi.org/10.1002/cepa.863
N1  - Special Issue: ICAAC ‐ 6th International Conference on Autoclaved Aerated Concrete
VL  - 2
IS  - 4
SP  - 267
EP  - 273
PB  - Ernst & Sohn Verlag
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Butenweg, Christoph
A1  - Rajan, Sreelakshmy
T1  - Design and construction techniques of AAC masonry buildings in earthquakes regions
T2  - 10 years Xella research in Building Materials : Symposium on the 4th and 5th of September, Potsdam 2014
Y1  - 2014
ER  - 
TY  - CHAP
A1  - Rochefort, E. de
A1  - Verver, M.
A1  - Grunendahl, A.
A1  - Mooi, H.
A1  - Butenweg, Christoph
T1  - Detailed modelling of the lumbar spine for investigation of low back pain
T2  - Digital Human Modeling for Design and Engineering Symposium : Iowa City, Iowa June 14-16, 2005. (SAE technical papers series ; 2005-1-2716)
Y1  - 2005
U6  - http://dx.doi.org/10.4271/2005-01-2716
SN  - 0096-736X
SP  - 1
EP  - 11
PB  - SAE International
CY  - Warrendale, Pa.
ER  - 
TY  - JOUR
A1  - Rochefort, E. de
A1  - Verver, M.
A1  - Grunendahl, A.
A1  - Mooi, H.
A1  - Butenweg, Christoph
T1  - Detailed modelling of the lumbar spine for investigations of low back pain
JF  - SAE transactions : papers presented at Society and Section meetings / Society of Automotive Engineers
Y1  - 2005
SN  - 0096-736X
VL  - Volume 114
IS  - Part 7
SP  - 788
EP  - 796
ER  - 
TY  - JOUR
A1  - Edip, K.
A1  - Sesov, V.
A1  - Butenweg, Christoph
A1  - Bojadjieva, J.
T1  - Development of coupled numerical model for simulation of multiphase soil
JF  - Computers and Geotechnics
N2  - In this paper, a coupled multiphase model considering both non-linearities of water retention curves and solid state modeling is proposed. The solid displacements and the pressures of both water and air phases are unknowns of the proposed model. The finite element method is used to solve the governing differential equations. The proposed method is demonstrated through simulation of seepage test and partially consolidation problem. Then, implementation of the model is done by using hypoplasticity for the solid phase and analyzing the fully saturated triaxial experiments. In integration of the constitutive law error controlling is improved and comparisons done accordingly. In this work, the advantages and limitations of the numerical model are discussed.
Y1  - 2018
U6  - http://dx.doi.org/10.1016/j.compgeo.2017.08.016
SN  - 0266-352X
VL  - 96
SP  - 118
EP  - 131
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Milkova, Kristina
A1  - Rosin, Julia
A1  - Butenweg, Christoph
A1  - Dumova-Jovanoska, Elena
T1  - Development of Seismic Vulnerability Curves for Region Specific Masonry Buildings
T2  - 16th European Conference on Earthquake Engineering, Thessaloniki, 18-21 June, 2018
Y1  - 2018
N1  - Paper No 10522
SP  - 1
EP  - 10
ER  - 
TY  - CHAP
A1  - Butenweg, Christoph
A1  - Gellert, Christoph
T1  - Displacement based design of masonry structures
T2  - Proceedings of the 14th International Brick and Block Masonry Conference : (Incorporating the 8th Australasian Masonry Conference) : Sydney, Australia, 13.-20. February 2008 / ed. Mark Masia ...
Y1  - 2008
SN  - 978-19-2070-1-92-5
SP  - 1
EP  - 10
PB  - University of Newcastle
CY  - Callaghan
ER  - 
TY  - CHAP
A1  - Dalguer, Luis A.
A1  - Churilov, Sergey
A1  - Butenweg, Christoph
A1  - Renault, Philippe
A1  - Hyun, An Jun
T1  - Dynamic analysis of a reinforced concrete electrical nuclear building of SMART 2013 project subjected to earthquake excitation using ABAQUS
T2  - Workshop SMART2013 : Paris, France, November 25th - 27th, 2014
Y1  - 2014
SP  - 1
EP  - 12
ER  -