Mexico City, the elevated rail line _3131 fast -

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Elevated rapid rail line in Mexico City

Elevated line construction. The line (4 lines) with cast post-tensioned box girder simply supported. Beam length of 35 meters,ugg italia, by the very thick paper bearing column. Cantilever column is designed to be able to resist all seismic force condition. In 1987, they built an elevated M line. This line (line No. 9 East) approach is used because of the elevated section of the lower taking into account the soil type, and there are many streets and highways along the route intersects with it. This 5.6 km long elevated line, a new structure using the program. Is in its four main longitudinal beam (hinged cantilever), is seven times horizontal beam, In this article, its called the horizontal beam (see photo). Each main beam consists of two parts, one is located in parts of the central cross-beams, and the other is a set of officials in the lower column bearing beam structure. Central and support beams are pre-tensioned members, the pond is separated beams and bridge deck elements post-tensioned cast mining dump double column system, the lower part of the structure. Two columns constitute the framework and supporting beams span of up to 5 meters. The center line of the cross between the two columns 5 ~ tJ4O meters long, clear span of 35 meters. Supported by the two column system and constitute the framework for Cheng Zhuliang Sharp ~ resist longitudinal seismic forces, and two columns to resist horizontal earthquake caused Cantilever force. New materials, new analogy in bridge number on the application circuit design of the superstructure has the following advantages: ... l, because all use of precast pre-tensioned concrete beams, access to the following benefits: a. Save the structure materials (concrete, steel and prestressed steel). b. Improve the quality of the project. C. Reduce construction time. 2, due to the use of vertical rigid frame to enable: a. The ability to resist seismic forces vertically enhanced. b. Greatly reduced the size column. 3, the use of hinged cantilever system to strike a balance so that the continuity of the upper structure, which: a. Respond better to resist the vertical loads. b. Significantly reduce the positive moment. C. Considerably reduce the torsion beam blue must point out that the maximum allowable deflection to span one-tenth of the net, so for the simple beam, requires a very heavy cross-section. d. The lower structure to withstand differential settlement of the capacity enhancement, thus avoiding disturbance of the rail transportation and other structural problems. 4,ugg italia, in the central support beam and located between the expansion joints stag, make, have to adapt to the beam caused by temperature changes because the volume change. 5, between the two columns on each section has two rotating point (often the case that simple beam, only a rotation point), it has great vertical curve and the level of the railway fit curve ability. Despite the great success of this project, but in the structural design and two types of deformation of the beam reinforced side encountered some problems. Indeed. These key parts of the design must take into account any potential spoilers. Should be considered at different stages, the role of the various possible combination of forces, such as static and dynamic load, wind and seismic forces such as impact. U.S. Journal \In this brief introduction to research the situation in some countries. 1. Soup Nang California State University Professor of Civil Engineering disciplines rejection of a glass fiber reinforced bridge panels were part of the model test, and dedicated to the research, development of new materials using slings. Replacement of concrete bridge deck or bridge deck usually takes 3 months time, if the use of pre-assembled glass fiber composite materials made of bridge deck Division, just a few days. Made of glass fiber construction of the bridge panel also improve the speed and simplify the construction process and significantly reduce the static load. The weight of glass fiber bridge deck concrete bridge deck is only 20% of the weight. This greatly reduces static,ugg italia, you can cancel the weight of bridge load limit, or increase the volume of bridge traffic lanes. Although the glass fiber material with these advantages, but its cost than Concrete, steel is high, thus overcoming the various problems in practical applications, but also quite some time. In addition, the glass fiber is very light, so the need to consider during the design of the bridge vibration and wind section, the role of vehicle. California State University through the glass fiber composite materials making the main beam Division,UGG scarpe, the first research laboratory for the bridge in the static and fatigue properties, and simulation of automobile traffic. U.S. Army Research and Development Center of compression components for bridges composite tensile families were studied. The key advantage of glass fiber material properties. Although the composite material technology has been used in actual bridges, but also has established a complete composite design standards. University of Virginia,ugg italia, Department of Communications together with the state road was built in 1985, the Joint 2.13 m wide, 4.88 m long glass fiber composite of all Division footbridge materials. A 2; a

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