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Effects of bottom bracings on torsional dynamic characteristics of horizontally curved twin I-girder bridges with different curvatures

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Earthquake Engineering and Engineering Vibration 2012年第2期11卷 149-162页

作者： Robiul Awall Toshiro Hayashikawa Takashi Matsumoto Graduate School of Engineering Hokkaido University Faculty of Engineering Hokkaido University

Curved twin I-girder bridges (CTIGBs) have low torsional stiffness that makes them vulnerable to dynamic loads. This study investigates the effects of bottom bracings on the torsional dynamic characteristics of CTIGBs. Five types of bottom bracings are designed to investigate their effects on the dynamic characteristics of CTIGBs with different curvatures under free and forced vibrations. To perform numerical investigations, three-dimensional (3-D) finite element (fe) bridge and vehicle models are established using commercial ANSYS code, and then a vehicle-bridge interaction analysis approach is proposed. Road roughness profiles generated from power spectral density and cross spectral functions are also taken into account in the analyses. The numerical results show that torsional frequencies increase significantly after providing bottom bracings, and the increasing rate depends on the type of bottom bracings and their locations of installation. Bottom bracings can act as load transmitting members from one main girder to the others. Large negative bearing forces that have occurred in bridges with small radii of curvatures can be remarkably reduced by providing bottom bracing systems. It is found that the performances of several bottom bracing systems are effective in improving the torsional dynamic characteristics of the bridges in this study.

关键词： bottom bracing CTIGB fe model torsional stiffness dynamic response negative bearing force

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Effect of Rolling Parameters on Plate Curvature during Snake Rolling

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Journal of Wuhan University of Technology(Materials Science) 2012年第2期27卷 247-251页

作者：付垚 State Key Laboratory of Non-ferrous Metals and Processes General Research Institute for Non-ferrous Metals

In order to predict the plate curvature during snake rolling, fe model was constructed based on plane strain assumption. The accuracy of the fe model was verified by the comparison between the plate curvature conducted by fe model and experiment respectively. By using fe model, the effect of offset distance, speed ratio, reduction, roll radius and initial plate thickness on the plate curvature during snake rolling was investigated. The experimental results show that, a proper offsetting distance can efficiently decrease plate curvature, however an excessive offsetting distance will increase plate curvature. A larger speed ratio, reduction will cause a large plate curvature, however a larger roll radius has effect to reduce plate curvature. Plate which undergoes a larger reduction and plate with a larger initial thickness always need a larger offset distance to keep the plate the minimum plate curvature, but for a larger roll radius a smaller offset distance is needed.

关键词： snake rolling plate curvature fe model offset distance

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Assessment of Seismic Damage in Nativity Church in Bethlehem Using Pushover Analysis

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Structural Durability & Health Monitoring 2021年第4期15卷 349-366页

作者： Belal Almassri Ali Safiyeh Civil and Architectural Engineering Department College of EngineeringPalestine Polytechnic UniversityHebronPalestine Civil Engineering Department Faculty of EngineeringNajjah National UniversityNablusPalestine

This study focuses on advanced finite element(fe)analyses on The Church of Nativity located in Bethlehem(Palestine),one of the most historic structures in the *** ensure the model quality,a 3D fe model was created using two types of typical commercial software,DIANA feA and *** analyses,one of the expected behaviors for this kind of masonry structure“low modal period”was *** seismic behavior of the church was studied using pushover analyses,which were conducted using DIANA *** first unidirectional mass proportional load pattern was created in both directions,X-direction as a longitudinal direction and Y-direction as the transversal *** incremental iterative procedure was used with monotonically increasing horizontal loads,using constant gravity *** results showed that the transversal direction is the most vulnerable and the damage concentrates at the main lateral(longitudinal)walls,mainly at the south and north alignment walls,and also at the vaults and at the connections of the vaults to the *** width was at the upper limit in the in-plane direction(X-direction).While,in Y-direction,it exceeded the limits of IBC code in width and length with a maximum width of 13.7 mm.A more accurate nonlinear dynamic analysis is recommended in the near future,which takes into account the material nonlinearity for more reasonable seismic behavior simulation.

关键词： Masonry seismic assessment fe model non-linear analysis DIANA feA SAP 2000

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