According to hot research of subsidence time function at home and abroad in recent years that there are commonness of less parameters and difficult to extended reflecting surface subsidence characteristics in the dynamic process, the surface subsidence dynamic coordinates time function were proposed based on the probability integration principle, established the calculation methods of surface dynamic process, anal sized the applicability and limitations of the dynamic time function and verified some examples. The results show that the function is more accurate than the Knothe time function in analyzing the actual regularity of surface subsidence caused by underground mining, reflecting the dynamic characteristics of surface movement in real time, interoperating mining phenomenon, it is more accurate to predict dynamic ground displacement and deformation which has a certain significance value in mining design and subsidence disaster management.
For the current study of large-span bridges are mostly in the component level, the real structural system reliability analysis is still relatively small, so based on the theory of dynamic reliability analysis of structure, the overall bridge structure system for the calculation model is established ,then reliability analysis under the multi-dimensional seismic load and the effect of dynamic flutter are performed, the results of sensitivity analysis with different parameters are obtained, so it is useful basis for the bridge design and evaluation.
In this paper, the vortex-excited resonance analysis are performed for main stay bar of a new type large-span bridge and the structural maximum displacement response in resonance state is calculated by programming , to be obtained the maximum displacement response and its occurring position of main stay bar in the vortex-stimulated resonance state caused by wind. The bottom of the main stay bar is fixed connection and the top is hinged. Because the bottom of the main tower fixed with better conditions, the maximum displacement should occur the place where are up middle of the main stay bar under the action of external loads. The analytical results show that the real compute results are better consistency with this judge. The results of this paper provide the base for the wind-resistant design of large-span bridge and can be to references for the coming bridge
The interfacial mechanical characteristics in anchorage zone of grouted bolts influence the ultimate capacity of bolts directly; a push-out test was carried out at the lab to study the interfacial mechanical characteristics in the case of bond failure happening at the grout-rock interface, leaned from some scholars to test methods for analysis of concrete microstructure instead of rocks. The commercial finite element software ANSYS method was adapted to analyze the dilatancy effect on the concrete during the grout was pushed out. Using conversion between compressive strength and tensile strength of concrete cube, the tensile strength can be calculated, as the basis for destruction of the concrete matrix.
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