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Josef Machacek,Jiri Studnicka 국제구조공학회 2002 Steel and Composite Structures, An International J Vol.2 No.1
Perforated shear connectors currently used in composite steel and concrete structures are described and evaluated. Modifications of the perforated connector suitable for common use in civil and bridge engineering are proposed. The connectors were tested in laboratories of CTU Prague for shear load capacity. Push tests of connectors with 32 mm openings and with 60 mm openings, both in normal and lightweight concrete of different strength characteristics and with different transverse reinforcement, were carried out. The experimental study also dealt with the connector height and parallel arrangement of two connectors and their influence on shear resistance. While extensive tests with static loading were carried out, fatigue tests under repeated loading are still in progress. After statistical evaluation of the experimental results and comparisons with other available data the authors developed reasonable shear resistance formulas for all proposed arrangements.
Effect of local small diameter stud connectors on behavior of partially encased composite beams
Josef Machacek,Giang Bergerova Nguyen 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.20 No.2
The paper combines two distinct parts. First the behavior of welded headed studs with small diameters of 10 and 13 mm acting as shear connectors (which are not embraced in current standards) is studied. Based on standard push tests the load-slip relationships and strengths are evaluated. While the current standard (Eurocode 4 and AISC) formulas used for such studs give reasonable but too conservative strengths, less conservative and full loadslip rigidities are evaluated and recommended for a subsequent investigation or design. In the second part of the paper the partially encased beams under bending are analyzed. Following former experiments showing rather indistinct role of studs used for shear connection in such beams their role is studied. Numerical model employing ANSYS software is presented and validated using former experimental data. Subsequent parametric studies investigate the longitudinal shear between steel and concrete parts of the beams with respect to friction at the steel and concrete interface and contribution of studs with small diameters required predominantly for assembly stages (concreting). Substantial influence of the friction and effect of concrete confinement was observed with rather less noticeable contribution of the studs. Distribution of the longitudinal shear and its sharing between friction and studs is presented with concluding remarks.
Image Signal Processing, Analysis and Detection for Robotic System
Jiri Haska,Martin Pies,Zdenek Machacek 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
This article describes the algorithm for searching the human face by the camera. This device is placed in a robotic head. This head should be used for the submission of information when entering into a building such as e.g. a museum. It is therefore necessary for the head to react to the stimuli. If a person appears in front of the head, the head must look at the person and react to the person. The received image is modified and converted to the matrix in which colors occurring on the human face are searched for. This way the adjusted matrix is put through to the search algorithm that is similar to the scanner. This determines whether or not the face is in the image and if it finds face’s edges. If the face is discovered, it is calculated its center. The axis are then sent across the bus to the movable part of head.