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Xie Q.,Xian University of Architecture and Technology | Zheng P.,Xian University of Architecture and Technology | Xiang W.,Xian University of Architecture and Technology | Cui Y.,Xian University of Architecture and Technology | Zhang F.,Shaanxi Institute of Architecture Science
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014

The existing ancient timber structures all have damage with different degrees. The damage of mortise-tenon joints has the biggest effect on the safety of the whole structure. In order to study the influence of damage with different types and degrees on the seismic performance of one-way straight tenon mortise-tenon joints, seven one-way straight tenon mortise-tenon joints models with a 1:4.8 scale made following requirements of the Fabrication Methods of Song Dynasty were tested by low-cycle reversed loading, including one intact joint, three artificially degraded joints with certain depth holes on the tenon to simulate fungi damage, three artificially degraded joints with through holes on the tenon to simulate termites damage. The behaviors of joints such as the failure characteristics, hysteretic loops and skeleton curve, degradation of rigidity and energy dissipation capacity were studied through low-cycle reversed loading experiment. The results indicate that the destructions occur at the mortise-tenon joints rather than in the beams and columns. The shape of hysteretic loops of all joints is S shaped and the gathering effect gets more obvious with the increase of damage degree. The rotation capacity, stiffness and energy dissipation capacity of the damaged joints are significantly below the intact one and reduce gradually as the damage degree increases. Under the same degree of damage, the final rotation capacity and stiffness of man-made fungi damage joints is bigger than that of the man-made termites damaged joints, but its energy dissipation capacity is lower than the man-made termites damaged joints. ©, 2014, Science Press. All right reserved.


Xue J.,Xian University of Architecture and Technology | Wu Z.,Xian University of Architecture and Technology | Zhang F.,Shaanxi Institute of Architecture Science | Zhao H.,Xian University of Architecture and Technology | And 2 more authors.
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering | Year: 2013

The aim is to evaluate the seismic properties of ancient timber structure after strengthening and analyze the failure process and corresponding failure state. Based on the hysteretic behavior and energy dissipation principle of the dovetail column-frame strengthened with CFRP and Arches Brackets under the low reversed cyclic loading, the "potential of destruction-resisting" of the two energy-consuming components is obtained. The dissipated energy of each energy-consuming component under the various earthquake conditions is calculated combining with the shaking table test of ancient timber structure. The model of seismic damage evaluation of the two energy-consuming components is established on the basis of the "potential of destruction-resisting" and the dissipated energy. By means of the energy distribution coefficient, the relationship of the failure state between energy-consuming components and overall strengthened structure is discovered, and the model of seismic damage evaluation of the overall structure under the various earthquake conditions is presented. With the derived model of seismic damage evaluation, the failure coefficient of the energy-consuming components and the overall strengthened structure is quantitatively calculated. According to the failure state, the corresponding damage grade of overall strengthened structure is obtained. The results can provide a reliable theoretical basis for predicting the destruction before earthquake and re-reinforcement to the strengthened ancient timber structures after earthquake.


Xie Q.-F.,Xian University of Architecture and Technology | Du B.,Xian University of Architecture and Technology | Zhang F.-L.,Shaanxi Institute of Architecture Science | Zheng P.-J.,Xian University of Architecture and Technology | Xu Q.-F.,Shanghai Key Laboratory of Engineering Structure Safety
Gongcheng Lixue/Engineering Mechanics | Year: 2014

Based on the analysis on the force mechanism of dovetail joints, their rotational moment was analyzed and a moment-rotation calculation formula was deduced. The existed test approved that the formula is accurate and the calculated result agrees well with the test result. According to the moment-rotation calculation formula, the factors affecting the rotational stiffness of dovetail joints were analyzed. The results show that: the rotational moment and initial rotational stiffness are increased as the increase of friction coefficients; the increase amplitude of initial rotational stiffness is reduced when the friction coefficient is more than 0.5; the rotational moment and initial rotational stiffness are improved with the increase of the length and angle of a tenon; the rofational moment is improved with the increase of the height of a tenon, but the initial rotational stiffness very little. The conclusions could provide a theoretical basis for the mechanics analysis of ancient timber structure buildings. ©, 2014, Tsinghua University. All right reserved.


Xie Q.,Xian University of Architecture and Technology | Xie Q.,Shanghai Key Laboratory of Engineering Structure Safety | Du B.,Xian University of Architecture and Technology | Xiang W.,Xian University of Architecture and Technology | And 3 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2015

In order to investigate the seismic performance of the mortise-tenon joints, considering the influences of vertical load, Pubofang, sparrowbrace and size effect, the low-cycle reversed loading tests were carried out. Seven mortise-tenon joints were made as the fabrications methods of Song Dynasty. The seismic behavior and their change laws, such as failure patterns, hysteretic behavior, bearing capacity, degeneration of stiffness and energy dissipation, were compared and analyzed. The results show that the failure patterns are mainly partial evulsion of tenon and extrusion deformation of mortise and tenon, and the beams and columns are intact. The tenon slips longitudinally along the length of the column without vertical load; under the influence of Pubofang, the evulsion of the tenon is smaller and shear deformation occurs on the edge of the connection between Pubofang and Mantou mortise. As the rotation rises, the sparrow brace separates from the beam gradually. The hysteretic loops are Z type, and have obvious gathering effect. The hysteretic loops become fuller when the vertical load increases. The hysteretic loops of the joint with Pubofang is smoother and the symmetry is better, while the loops with sparrow brace shows evident asymmetry. With the increase of the vertical load, the opposite bearing capacity is higher, but the forward bearing capacity is lower. Pubofang increases the bearing capacity dramatically in both directions, while the sparrow brace only works in the forward. The rigidity of the joint with Pubofang improves greatly, but the energy dissipating capacity becomes weaker. The sparrow brace improves the energy dissipating capacity just in the primary stage. The bearing capacity and rigidity of the joints are all against the similarity relationship, and the theory basis could be provided according to the fitted formulas. ©, 2015, Science Press. All right reserved.


Xue J.Y.,Xian University of Architecture and Technology | Wu Z.J.,Xian University of Architecture and Technology | Zhang F.L.,Shaanxi Institute of Architecture Science | Zhao H.T.,Xian University of Architecture and Technology
Advances in Structural Engineering | Year: 2015

Lack of the evaluation method for timber structure has been developed as a critical problem in decades to protect the ancient timber building. Therefore, it is essential to conduct an intensive study on the failure mechanism of the ancient timber building in order to precisely predict the structural failure prior to earthquake and evaluate the seismic damage and structure maintenance after the earthquake. Based on the test of dovetail column-frame and bracket sets under low reversed cyclic loading and the shaking table test of overall structure, the "potential of destruction-resistance" of the two energy-consuming components under low reversed cyclic loading and the energy dissipated of each energy-consuming component under various earthquake conditions were investigated. A seismic damage evaluation model of the energyconsuming components/structure based on the "potential of failure-resistance" and the energy dissipation was developed. With the failure coefficient, the damage level of each energy-consuming component and the overall structure can be evaluated respectively. Finally, the seismic damage evaluation model is validated by the experiment result.

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