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Sun G.,Hohai University | Sun G.,Suzhou University of Science and Technology | Gu Q.,Hohai University | Gu Q.,Suzhou University of Science and Technology | And 3 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014

To investigate the seismic behavior of partially-restrained steel frame with RC infill walls, an innovative subassemblage was proposed to consider the influence of boundary condition on the infill walls reasonably. Three 1/3 scale, one-bay and three-story test specimens were carried out under low cycle reversed test, and the effect of infill walls type on structural performance was studied. The hysteretic curves, skeleton curves, ductility, stiffness degradation, energy dissipation, and the distribution of lateral shear were obtained. Test results reveal that test specimens with slit RC walls and concealed vertical slit RC walls take on the significant full hysteretic curves, and high deformability and energy dissipation, but small lateral strength and stiffness. Both test specimens produce flexural failure mode of slit wall. Test specimen with solid infill walls has narrow hysteretic curve, low deformability and energy dissipation, but high lateral strength and stiffness, which takes on the shear failure mode of infill walls. The employment of infill walls decreases the rotation requirement of connection resulting from earthquake. During the test, the maximum connection rotation angles of three specimens are no more than 0.025 rad, which can avoid the brittle failure of surrounding steel frame due to connection failure. The infill walls sustain approximately 80% lateral strength at initial loading stage, and with the lateral strength increase this ratio gradually decreases.

Chen C.,Northeastern University China | Zhao W.,Northeastern University China | Li S.-G.,Northeastern University China | Pang Y.-B.,China Northeast Architectural Design & Research Institute Co.
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2015

The excavation process of the underground passage under the east station house at Shenyang station was simulated by FEM. The land subsidence, deformation of retaining piles, inner force of stand columns, and the deformation of underlying tunnel were analyzed. The results show that underpinned plates can limit the horizontal displacement of retaining piles and the upheaval of the pit bottom effectively, thus controlling the land subsidence. The upheaval of the soil at the pit bottom caused by the excavation process leads to the increase of the axial force of stand column, which may affect the stability of the support structure system. Moreover, the excavation process has an obvious effect on horizontal and vertical displacement of underlying tunnel, where one kind of convergent deformation happens in the tunnel in the form of 'the horizontal compression and the vertical stretch'. The impact of the cross constuction of foundation pit on the ambient environment and structures cannot be ignored. ©, 2015, Northeastern University. All right reserved.

Yang L.,China Northeast Architectural Design & Research Institute CO. | Pang Y.,China Northeast Architectural Design & Research Institute CO. | Li S.,Northeastern University China
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2015

Using the numerical simulation, we calculated and analyzed the process of excavation by section and block of foundation pit at Panjin underground commercial street. The results show that with the increase of the excavation section length, the maximum lateral displacement of supporting piles shows the tendency of reduction at first and increase afterwards; while the basement uplift shows the tendency of inereasing. With the increase of the excavation block length, the lateral displacement of supporting piles on protected sides shows the same tendency of reducing at first and increasing afterwards. Taking into account the spatial effect in the excavation, the long foundation pits can mitigate the deformation of supporting structure and formation effectively. Considering whether the excavated soil has enough strength to limit the deformation of supporting structure and formation in the process of foundation pit excavation with different section and block could make spatial effect significantly. ©, 2015, Jilin University Press. All right reserved.

Zhang Z.,China Northeast Architectural Design & Research Institute Co.
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2014

In order to improve the capacity of collision of trestle structure, the mechanism of collision between truck and trestle structure was studied. Based on actual accident investigations, a classical collision accident of a coal transporting trestle hit by vehicle was simulated. The failure modes, stress and displacement response of the castellated beam and the bracket were analyzed. Results indicate that under impact load the stress of castellated beam was maximal at the supporting regions and impact site. Bracket has the feature of tension-torsion. The computational results can be used for further studies on the truck-trestle impact problem. ©, 2014, Science Press. All right reserved.

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