Based on the use of Poly-Urethane-Cement composite material to strengthen the concrete structure element, this study concern of the strain induced in concrete and steel bar of control beam and retrofitted beams with PUC. This is a new technique of externally strengthen the Concrete girder beams, control beam (RC) were constructed same in all cases and tested under four-point bending load. The objectives of this study are to examine the flexural bending strain of retrofitted beam with Poly-Urethane-Cement material (PUC). Experimental results show the PUC have highly deformation and improving the stiffness of beams. The retrofitting beams with PUC have highly deformed comparing with control beam.
River ice exists in the most countries and regions and brings much damage to the structures in the river. However, the mechanical properties of the river ice are still unclear. In the present study, over 150 specimens of river ice taken from Songhua River of China have been investigated using the MTS machine to measure the flexural strength and the effective modules at various test temperature and strain rate. The test temperature was set at three different point (-5°C,-10°C,-20°C), the strain rate was set at the range from 3.33E-5/S to 3.33E-3/S. The test results show that the flexural strength of river ice depends on the temperature and strain rate. It increases with the decreasing test temperature. The flexural strength of river ice changes at the various strain rate, however, it is non-monotonic. The variation curve looks like a inversed "W" shape. Under flexural loading condition, the effective modules of Songhua River ice is about 0.568~0.825GPa. And The modules of river ice increases with the increasing of the strain rate. The effective modules of river ice also increases with the decreasing of the test temperature slightly.
Self-anchored suspension bridge is widely used in Chinese City bridge engineering for the past few years. Because the anchorage system of main cable has been changed from anchorage blocks to the ends of the girder, its' dynamic mechanics behavior is greatly distinguished with the traditional earth anchored suspension bridge. This paper studies the dynamic characteristics and seismic response of one large-span self-anchored suspension bridge which is located in China/Shenyang city. Using a spatial dynamic analysis finite element mode, the dynamic characteristics are calculated out. An artificial seismic wave is adopted as the ground motion input which is fitted with acceleration response spectrum according to the Chinese bridge anti-seismic design code. Time-integration method is used to get the seismic time-history response. Geometry nonlinear effect is considered during the time-history analysis. At last, the dynamic characteristics and the behavior of earthquake response of this type bridge structure are discussed clearly. The research results can be used as the reference of seismic response analysis and anti-seismic design for the same type of bridge.
Fiber reinforced polymer (FRP) bars have been widely used in civil engineering used as a substitute for steel reinforcement because it has many advantage such as high strength, light weight and no corrosion. Moreover, the productive technology becomes more and more mature and industrialized so that FRP has become one economic and competitive structure material. Based on the recent researches, this paper mainly introduces progress in the studies on concrete structures reinforced with FRP bars. These contents in this paper include the bond performance of FRP bars in concrete, shear resistance, flexural behavior and ductility of concrete structure reinforced with FRP bars in the past few years in the world.
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