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PL
W artykule przedstawiono przykłady projektów i realizacji obiektów mostowych o małej rozpiętości, z wykorzystaniem zalet przekrojów i elementów hybrydowych. W kolejnych rozdziałach omówiono rozwiązania projektowe zastosowane w poszczególnych obiektach.
EN
The paper presents examples of design and implementation of bridges with small span, using the advantages of hybrid cross-sections and elements. The following chapters discuss the design solutions used in individual cases.
EN
The study presents the finite element (FE) model update of the existing simple-spans steel-concrete composite bridge structure using a particle swarm optimisation (PSO) and genetic algorithm (GA) approaches. The Wireless Structural Testing System (STS-WiFi) of Bridge Diagnostic, Inc. from the USA, implemented various types of sensors including: LVDT displacement sensors, intelligent strain transducers, and accelerometers that the static and dynamic historical behaviors of the bridge structure have been recorded in the field testing. One part of all field data sets has been used to calibrate the cross-sectional stiffness properties of steel girders and material of steel beams and concrete deck in the structural members including 16 master and slave variables, and that the PSO and GA optimisation methods in the MATLAB software have been developed with the new innovative tools to interface with the analytical results of the FE model in the ANSYS APDL software automatically. The vibration analysis from the dynamic responses of the structure have been conducted to extract four natural frequencies from experimental data that have been compared with the numerical natural frequencies in the FE model of the bridge through the minimum objective function of percent error to be less than 10%. In order to identify the experimental mode shapes of the structure more accurately and reliably, the discrete-time state-space model using the subspace method (N4SID) and fast Fourier transform (FFT) in MATLAB software have been applied to determine the experimental natural frequencies in which were compared with the computed natural frequencies. The main goal of the innovative approach is to determine the representative FE model of the actual bridge in which it is applied to various truck load configurations according to bridge design codes and standards. The improved methods in this document have been successfully applied to the Vietnamese steel-concrete composite bridge in which the load rating factors (RF) of the AASHTO design standards have been calculated to predict load limits, so the final updated FE model of the existing bridge is well rated with all RF values greater than 1.0. The presented approaches show great performance and the potential to implement them in industrial conditions.
3
Content available remote Shear behavior and analytical model of T-type perfobond rib connectors
EN
The stress of shear connectors becomes more complicated with the increase of the span length of steel–concrete composite bridges. To ensure sufficient stiffness and ductility, a T-type perfobond rib (T-type PBL) shear connector is proposed. However, its mechanical behavior is not well understood due to the special shape and numerous influencing factors. Therefore, sixty-three finite element models were established based on the push-out test specimens with T-type PBL connectors to investigate the shear behavior and influencing parameters of ultimate bearing capacity. The effects of concrete end-bearing, perforated reinforcement, hole diameter, rib height, and flange width of T-type PBL on the shear-bearing capacity were performed and discussed based on the numerical results. The results showed that the bearing capacity provided by the concrete end-bearing and the perforated reinforcements was about 16% and 10% of the ultimate load. Additionally, the ductility of the specimen could be improved by the perforated reinforcements. It was showed that the shear-bearing capacity increased nonlinearly with the growth of the hole diameter. When the height of rib increased from 80 to 120 mm, the shear-bearing capacity was improved by 12% on average. The impact of flange width on the shear-bearing capacity was insignificant, which was less than 1.5%. Based on the results of parametric analysis. An analytical model for shear-bearing capacity of the T-type perfobond rib shear connector was established, and the validity was verified by relative test results. A basis for the evaluation of shear-bearing capacity, and application of the T-type PBL connectors was provided in this paper.
PL
W ramach programu modernizacji dróg w województwie zachodniopomorskim zbudowano wiele nowych mostów zespolonych stalowo-betonowych. Przedstawiono kilka rozwiązań konstrukcji, w tym nowe mosty zespolone w ciągu autostrady A6 i drogi ekspresowej S3, a także główne konstrukcje przepraw przez rzeki Regalicę i Parnicę oraz cieśninę Dziwny.
EN
For the highway network improvement in the region of West Pomerania, many new composite bridges have been constructed. Several structures are highlighted, including new major composite structures along the A6 motorway and S3 expressway, in addition to river and strait crossings.
EN
General rules of ultimate limit states design according to PN-EN code system are given. The following ultimate limit states of composite steel-concrete bridges are described: stress, deflection, cracking, web breathing. The design rules are explained and discussed.
6
Content available remote Most nad Kanionem Kolorado
PL
Most składa się z części nurtowej długości 364,0 m (cztery przęsła rozpiętości 91 + 130 + 91 + 52 m) o konstrukcji stalowej oraz części zalewowej długości 559,0 m (identyczne czteroprzęsłowe segmenty rozpiętości 68 + 71,5 + 71,5 + 68 m) o konstrukcji zespolonej stalowo-betonowej. Przedstawiono główne założenia projektowe oraz problemy realizacji robót wzmacniających.
EN
The main stream structure is 364,0 m wide and covered by four different spans (91 + 130 + 91 + 52 m) whereas the flooding part of 559,0 m wide is divided into four spans one (68 + 71,5 + 71,5 + 68 m). For composite steel and concrete construction the captal design assumptions and problems of realization the strengthening work have been presented.
PL
Konstrukcja stalowa pięciu przęseł swobodnie podpartych kratownicowych została rozebrana. Po remoncie podpór wykonano nowy ustrój nośny składający się z czterech stalowych dźwigarów belkowych ciągłych, zespolonych z płytą żelbetową. Omówiono realizację mostu.
EN
Because of its poor condition, the existing five single span steel truss bridge was dismanteld. After piers and abutements repair the new structure of four continous steel girders composed with RC deck was assembled.
PL
Ustrój nośny mostu stanowi konstrukcja stalowa ciągła pięcioprzęsłowa składająca się z trzech dźwigarów skrzynkowych zespolonych z płytą żelbetową. Konstrukcja ta jest oparta na podporze w postaci łuku oraz na podporach słupowych i przyczółkach. Opisano rozwiązanie konstrukcji i budowę mostu.
EN
The bearing structure of the bridge consists of three continuous 5 span steel box girders composed with reinforcement concrete deck. The bridge structure as well as its piers and abutements is described.
PL
Most jest ciągłą trójprzęsłową konstrukcją stalowo-betonową o przęsłach rozpiętości 62 + 63 + 62 m. Podano podstawowe informacje dotyczące budowy podpór i ustroju nośnego.
EN
Three span (62 +63+62 m) continuous steel girder bridge composed with reinforced concrete deck is described. Basic information concerning bearing structure, piers and abutements is produced.
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