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Jiang Z.,Tongji University | Deng Z.,Tongji University | Zhang N.,China State Construction Engrg. Corporation Ltd. Technical Center
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2012

The effects of factors (i.e., sample mass, heating and cooling rates) on the recurrence, resolution or accuracy of theormoporometry (TPM) experimental results were investigated via the proposed theoretical calculation model and TPM method for the characterization of pore structure of cement-based material. The results obtained by TPM were compared to the results tested by nitrogen adsorption method (NAD). It was indicated that the results by TPM during cooling period could be used to characterize the pore structure of cement-based materials when the sample quality was > 30 mg and the cooling testing rate was 1°C/min, which were similar to the results by NAD. The basic parameters of TPM were also determined.

Wang D.,China State Construction Engrg. Corporation Technical Center | Li Z.,Beijing University of Technology | Hang Y.,Shanghai Huajiang Construction and development Co. | Hu F.,China State Construction Engineering Corporation
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2010

Unbounded post tension tendons play a very important role in pre-stressed assembly structures, they not only can assemble the components into a whole assembly but also can generate extrusion force and friction force between the beam-column contact surfaces, which can transfer the shear force in beams. This paper studied the behavior and the impact factors of stress increment for un-bonded pre-stressed tendons under two different assembly methods (direct assembly and hybrid assembly) through testing seven un-bonded pre-stressed precast beam-column connections. This paper gained the stress increment calculation formula by using the moment rotation relationship of sections; the calculated results show the good agreement with the tests. The theoretical analysis and experiment show that the un-bonded post tension tendon have always been able to maintain elastic in the entire process, which not only ensures the strength but also the good deformation ductility of the connections. Therefore, the pre-stressed precast structures can meet seismic requirements in strength and ductility.

Qi H.,China State Construction Engrg. Corporation Ltd. Technical Center | Li Y.G.,China State Construction Engrg. Corporation Ltd. Technical Center | Lu X.L.,Tongji University
Applied Mechanics and Materials | Year: 2013

Shanghai Pudong Shangrila Hotel extension project is a super-high frame-shear wall structure. In this paper, a concrete uniaxial hysteresis constitutive model and a practical elastic plastic damage constitutive model are introduced, both of which are established by the author before, and then both models are developed in ABAQUS via UMAT, and used to simulate Shanghai Pudong Shangrila hotel extension engineering. The numerical model is established in PKPM and then be converted to ABAQUS, in which fiber model is used to simulate the frame elements and sell model is used to simulate shear-walls. Through numerical simulation, we can see that the simulation results and test results are coincided well, which proved that the proposed constitutive models is effective in analyzing large complex structures, and the selected element models are reasonable. © (2013) Trans Tech Publications, Switzerland.

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