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Zhou Q.,Palace Museum | Zhou Q.,Beijing University of Technology | Yan W.,Beijing University of Technology
Applied Mechanics and Materials | Year: 2012

To protect Chinese ancient wooden buildings, by simulation means a decayed wooden beam of an ancient building in the Forbidden City was taken as example to study its bearing performances after strengthened by steel bands and bolts. The ancient wooden beam was found to decay on its forepart. The decayed part of beam was considered to be replaced by new wooden part, which connected with old part of beam by bolts and steel bands. Finite element model of the strengthened beam was built considering swivel type of boundary conditions. By contact analysis of ANSYS program, distortion value, compression, tension as well as contact stresses of the strengthened beam under vertical loads were obtained, feasible strengthening suggestions were proposed. Results show that inner forces and distortion value of the strengthened beam are within permission scopes, thus the strengthening method is feasible. © (2012) Trans Tech Publications, Switzerland. Source

Zhou Q.,Palace Museum
Applied Mechanics and Materials | Year: 2014

To protect Chinese ancient buildings, tou-kung (bracket sets) in the Forbidden City in Beijing were taken as example to study their aseismic constitution problems and strengthening methods by survey as well as analysis methods. According to constitution characters and mechanical performances of these tou-kungs, their typical aseismic constitution problems were summed up, causes for the problems were discussed, and strengthening advices were proposed. Results show that typical aseismic constitution problems of these tou-kungs include decay, crack, deflection, slack and disengage of parts and so on; main causes relate not only to constitution, construction and bearing performances of bracket sets, but also material properties of wood; besides, effectively strengthening methods for these tou-kungs include reassembling, gluing, iron components connection and so on. © (2014) Trans Tech Publications, Switzerland. Source

Zhang R.,Palace Museum | Yue L.,Shaanxi Provincial Institute of Archaeology | Yang J.,Shaanxi Provincial Institute of Archaeology
Journal of Nanoscience and Nanotechnology | Year: 2016

The samples of river snail shell pieces, unearthed from Laoniupo Shang dynasty site, were observed and characterized by SEM, Raman and IR to obtain the information about their chemical component and crystal structure. The uneven surface of the cuticle was covered with nanoparticles, which formed rough surface of the shells. The surface of pearl layer was combined with nano-sized flakes and kept smooth on the whole. The insection of shell was composed of three layers: the cuticle (100-120 μm in thickness), the prismatic layer (∼130-140 μm in thickness), and the thickest pearl layer (280-300 μm in thickness). All layers had the component of calcium carbonate with aragonite structure and they were different in nanostructures because of different biomineralization processes. Copyright © 2016 American Scientific Publishers. All rights reserved. Source

Ma C.,Northwest University, China | Huang J.,Northwest University, China | Ma H.-X.,Northwest University, China | Xu K.-Z.,Northwest University, China | And 5 more authors.
Journal of Molecular Structure | Year: 2013

A novel potassium complex has been synthesized and characterized under the non-isothermal conditions by DSC and TG-DTG method. The 4,4-azo-1,2,4-triazol-5- one (ZTO) has the molecular formula C4H4N 8O2. The thermodynamic parameters, HOMO-LUMO energy gap, total energy and electrostatic potential (MEP) of ZTO are conducted by density functional theory DFT/B3LYP calculation method with 6-311G basis set. In the coordination polymer, with the ligand anion (ZTO-) as space linkers, two types of potassium atoms centers are joined together to form three-dimensional frameworks. The enthalpy, apparent activation energy and pre-exponential factor of the second exothermic decomposition reaction are 85.43 kJ mol-1, 414.4 kJ mol-1and 1037.92 s -1, respectively. The critical temperature of thermal explosion (Tb) for [K(ZTO)ṡH2O]∞ is 275.08 °C. [K(ZTO)ṡH2O]∞ CCDC: 902339. © 2012 Elsevier B.V. All rights reserved. Source

Zhou Q.,Palace Museum | Zhou Q.,Beijing University of Technology | Yan W.,Beijing University of Technology | Ji J.,Beijing University of Technology
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2013

The Wenchuan earthquake in 2008 had caused serious damages of many modern buildings but relatively slight damages of Chinese ancient wooden buildings. To find out aseismic mechanism of these ancient structures, Taihe Palace in the Forbidden City was taken as example for analysis. Besides layout, its components such as basement, column, tenon-mortise joint, Tou-Kung (bracket sets), beam structure, roof, wall and so on were all considered to discuss their effects to aseismic performances of the whole structure. Results show that layout of Taihe Palace is reasonable, which can avoid torsion mode of itself; its column roots are set on stone bases by free-standing means, which can absorb part of earthquake energy by sliding motions of column roots; its tenon-mortise joints and Tou-Kungs can consume part of earthquake energy by frictions and compressions among their components; low ratio of height against width of its beam structure can avoid sliding as well as overturn under earthquakes; its thick roof may enhance stability of the whole structure; finally the wall components can reduce deformation of wooden frames under earthquakes. Source

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