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Chen X.-M.,China State Construction Technical Center | Cen S.,Tsinghua University | Li Y.-G.,China State Construction Technical Center | Sun J.-Y.,China State Construction Technical Center
Mathematical Problems in Engineering | Year: 2013

For nonconforming finite elements, it has been proved that the models whose convergence is controlled only by the weak form of patch tests will exhibit much better performance in complicated stress states than those which can pass the strict patch tests. However, just because the former cannot provide the exact solutions for the patch tests of constant stress states with a very coarse mesh (strict patch test), their usability is doubted by many researchers. In this paper, the non-conforming plane 4-node membrane element AGQ6-I, which was formulated by the quadrilateral area coordinate method and cannot pass the strict patch tests, was modified by three different techniques, including the special numerical integration scheme, the constant stress multiplier method, and the orthogonal condition of energy. Three resulting new elements, denoted by AGQ6M-I, AGQ6M-II, and AGQ6M, can pass the strict patch test. And among them, element AGQ6M is the best one. The original model AGQ6-I and the new model AGQ6M can be treated as the replacements of the well-known models Q6 and QM6, respectively. © 2013 Xiao-Ming Chen et al.


Duan J.,China State Construction Technical Center | Li Y.G.,China State Construction Technical Center
Advanced Materials Research | Year: 2014

In this paper, a three-dimensional beam element is developed for geometric nonlinear dynamical analysis. This element is based on the co-rotational formulation, in which the displacements of beam element are subdivided into rigid body movements and elastic deformations. The formulations are derived from the continuum mechanics based Updated Lagrangian incremental equations. The element can undergo large deflections and rotations, but small strains are assumed in the deduction. The validity of this element is confirmed by comparing with the numerical results in other literatures. © (2014) Trans Tech Publications, Switzerland.


Liu K.,China State Construction Technical Center
Advanced Materials Research | Year: 2014

This paper investigates the ductility of SIFCON blocks with various structural measures adopted to further increase their ductility. Ten SIFCON blocks with various designs were tested using a compression machine to investigate their ductility. The variables examined included fiber alignment, confinement, perforation, and longitudinal bars. Results of the tests indicated that SIFCON blocks with confinement in the form of stirrups and additional perforation can produce better ductility than others. © (2014) Trans Tech Publications, Switzerland.


Liu K.,China State Construction Technical Center
Applied Mechanics and Materials | Year: 2013

Closed form solutions are derived in this work by including free end slip, relating free end and loaded end slips to bond resistance, as well as relating slip or strain at any position to free end slip. To identify the bond-slip relationship, indirect analytical identification from load-slip response curve is used. Using the identification procedure developed in this paper, very good agreement between the theoretical solutions and experimental results was observed, which validates the theoretical results derived in this work. © (2013) Trans Tech Publications, Switzerland.


Liu K.,China State Construction Technical Center
Advanced Materials Research | Year: 2013

Pure adhesive bond of FRP to concrete is not only weak but also unreliable in a long term. This problem can be effectively overcome by a newly developed bond enhancement system - the hybrid bonded FRP system (HB-FRP) - in which small mechanical fasteners are used to augment the bond. In this paper, the bond behaviors of EB-FRP and HB-FRP joints were experimentally investigated by employing the single shear pull-off test on three EB-FRP and seven HB-FRP specimens with different bond lengths. Experimental testing is reported for characterization of the interfacial bond of the HB-FRP system. © (2013) Trans Tech Publications, Switzerland.


Duan J.,China State Construction Technical Center | Li Y.G.,China State Construction Technical Center
Applied Mechanics and Materials | Year: 2014

A comfort analysis for the buildingat a metro depot is presented in this paper with FEA method. First, the dynamic analysis for the whole building structure is performed and the acceleration responseofeach floor is calculated and compared with the civil codes, based on which the structuralcomfortis estimated. And then, the major factor resulting in the comfort problem of shear-wall buildings is obtained by frequency domain analysis and it is the summation of mode participatingcoefficientsaccording to the peak-amplitude frequency-range of vibration source. And finally, an advice for the modification of buildingdesignis presented to avoid the structural comfort problem. © (2014) Trans Tech Publications, Switzerland.


Liu K.,China State Construction Technical Center
Applied Mechanics and Materials | Year: 2014

This paper investigates the ductility of beams with slurry infiltrated fiber concrete (SIFCON) blocks. Three SIFCON blocks with confinement in the form of stirrups and additional perforation were tested in a beam where a SIFCON block was placed into the plastic hinge zone of the beam as a compression yielding material. Results of the tests indicated that SIFCON blocks with confinement in the form of stirrups and additional perforation can produce sufficient ductility for compression yielding system. © (2014) Trans Tech Publications, Switzerland.


Liu K.,China State Construction Technical Center
Applied Mechanics and Materials | Year: 2013

Pure adhesive bond of FRP to concrete is not only weak but also unreliable in a long term. This problem can be effectively overcome by a newly developed bond enhancement system - the hybrid bonded FRP system (HB-FRP) - in which small mechanical fasteners are used to augment the bond. In this paper, theoretical modeling is reported for characterization of the interfacial bond of the HB-FRP system. Local bond-slip model involving adhesive and mechanical mechanisms is proposed. Based on the basic bond-slip model, load-slip response, ultimate bond strength, and effective bond length of the HB-FRP bond interface are obtained by analytical or numerical solution. Good agreement between the analytical and experimental results indicates that the proposed bond-slip model can well predict bond behaviors of HB-FRP joints. © (2013) Trans Tech Publications, Switzerland.


Liu K.,China State Construction Technical Center
Applied Mechanics and Materials | Year: 2013

Gypsum walls are a green product that helps to save energy and protect the environment. This paper investigates the shear strength of glass fiber reinforced gypsum (GFRG) walls fully or partially filled with concrete in the hollow cores. Eight full scale GFRG walls were tested. The shear performance of the tested walls, including the shear failure mode, hysteresis responses, the ultimate shear strength were studied in the paper. A design procedure for the shear strength of the concrete filled GFRG walls is developed. © (2013) Trans Tech Publications, Switzerland.


Liu K.,China State Construction Technical Center
Applied Mechanics and Materials | Year: 2013

Gypsum walls are a green product that helps to save energy and protect the environment. This paper numerically investigates the effect of axial load on shear strength of glass fiber reinforced gypsum (GFRG) walls fully or partially filled with concrete in the hollow cores. The conclusion drawn in this paper is general and applicable to other kinds of walls. © (2013) Trans Tech Publications, Switzerland.

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