Papers by Author: Zhe Zhang

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Authors: Ying Wang, Miao Li, Jin Hua Xu, Zhe Zhang
Abstract: Concrete filled steel tube (CFT) structure has advantages of the high tensile strength and ductility of steel in addition to the high compressive strength and stiffness of concrete. This research proposes a new CFT column-CFT beam frame structure. In order to validate the cost performance of the new CFT column-CFT beam frame structure, designs were carried out for building frames using both the new CFT column-CFT beam frame structure and conventional steel frame structure. The amount of consumed materials and cost estimations of each designed new CFT and conventional steel building frame are analyzed and compared. The result shows that the new CFT column-CFT beam frame structure is able to exhibit high cost performance than conventional steel frame structure.
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Authors: Zhe Zhang, Yan Feng Feng, Qing Li, Shu Juan Zheng
Abstract: Based on the heterogeneity of rock, by using the RFPA2D, influene of the horizontal in-situ stresses on the distributions of plastic zones is discussed. Among the current problems that rock or civil engineers face, perhaps there is none as challenging as the characterization of fluid flow though fracturing rocks, especially when they are highly stressed. In mining and civil engineering projects, the re-distribution of the stress field during the excavation of tunnels and underground chambers lead to the formation of new fractures. These damages may cause dramatic changes in the permeability of the rock masses. As a result, the rate of water flowing into the tunnels and chambers will increase.
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Authors: Zhe Zhang, Yan Feng Feng, Qing Li, Qing Lei Yu
Abstract: Based on the heterogeneity of rock, by using the RFPA2D, influene of the horizontal in-situ stresses on the distributions of plastic zones is discussed. The deformation and nonlinear gradual failure characteristics of circular roadway in deep rock mass as well as the displacement and the stress variation of the key position in the periphery of the roadway were analyzed, When λ>1, the plastic area was large-scale, but deflection more little , when λ<1, the plastic area was little-scale, but deflection increase. The study indicates that the stress concentration occurs in the periphery of the roadway after evacuation and plastic deformation zone engenders under the persisting stress of the surrounding rock, then the cracks appears and expands continuously, the broken rock zone appears at last and the intensity of the stress concentration decreases as well as the stress field shifts beyond.
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