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Research on Strengthening and Its Performance of Chinese Ancient Timber Structures

Author: ZhangFengLiang
Tutor: ZhaoHongTie
School: Xi'an University of Architecture and Technology
Course: Structural Engineering
Keywords: ancient timber structure carbon fiber reinforced polymer steel flat strengthen mortise-tenon joint shaking table test dynamic analysis model time historyanalysis strengthening design method
CLC: TU366.2
Type: PhD thesis
Year: 2013
Downloads: 213
Quote: 0
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The good mechanical properties of Chinese ancient timber structure, due to itsunique structural characteristics, makes the existing ancient timber structures such asShanxi Buddha temple hall and Wutai mountain south temple hall still stand to the earthafter experiencing thousands of rains, winds and earthquakes. However, in the endlesshistory years, because of material ageing and many kinds of damages like earthquake,most of the ancient buildings are in the perilous state of damaging, risk escalating evenpotential collapse. Therefore, repair reinforcement work of ancient timber structuresregarded as the fruit of ancient culture becomes more and more important.Combined with the earthquake damage survey to the ancient timber structures afterWenchuan earthquake, it took detailed analysis and discussion under the effects ofearthquake damage to the ancient timber structures in terms of foundation, componentsuch as beams and columns, mortise-tenon joints, overall stability and buildingenvelope through summing up and classification and statistical methods; And inallusion to different structure damages, it put forward the corresponding seismicstrengthening methods.In order to investigate the failure process and corresponding failure mode of theancient timber structure so as to be able to make a reasonable evaluation of the damagedegree of the ancient timber structure after earthquakes, the ‘potential ofdestruction-resistance’ of the two energy-consuming components under low reversedcyclic loading was calculated based on the hysteretic behavior and energy dissipationprinciple of the dovetail column-frame and arches brackets under the low reversedcyclic loading. The dissipated energy of each energy-consuming component undervarious earthquake conditions was calculated based on the results of the shaking tabletest of ancient timber structure. The model for seismic damage evaluation of the two energy-consuming components was established on the basis of the ‘potential ofdestruction-resisting’ and dissipated energy. The relationship of the failure modebetween energy-consuming components and overall structure was found by means ofthe energy distribution coefficient. The model for seismic damage evaluation of theoverall structure under the various earthquake conditions was also developed. With thederived model of seismic damage evaluation, the energy-consuming components andthe overall structure can be evaluated separately; the resulting failure coefficient canbetter reflect the failure mode of each component and the overall structure under variousearthquake conditions.A shaking table test of a model of an ancient timber structure,constructedaccording to the Fabrication Methods of Song dynasty and strengthened with CFRP,was conducted. Quantitative analyses were performed for the displacement andacceleration response of the root,the head of column,Shop Aung,Ru Fu,theearthquake shear of structure and the internal force tenon-mortise node,failure pattern,dynamic property,and torsional effect.The study showed that the friction-sliding ofpedestal,rotation of semi-rigid tenon-mortise node and sliding of Shop Aung greatlydecreased the dynamic response of the structure,and met the design requirements of nodamage under frequent earthquakes,repairable under moderate earthquakes and nocollapse under rare earthquakes.Maximal shear force of the structure distributed alongthe height appeared in the column frame layer or the pedestal,and the maximal bendingmoment of tenon-mortise node under different conditions was also obtained.Due to theparticipation of high vibration model and non-uniform distribution of mass andstiffness,there was obvious twist beyond400Gal.According to the mechanical properties of ancient timber structure, its restoringforce characteristic curves of the key position and components were got based on thetest and theoretical analysis, and the plinth, mortise-tenon joint and the Arches bracketwere simulated with Combine40, Combine39+Combine14, Combine39of large scalefinite numerical simulation software ANSYS, and the finite element model wereestablished. The first ten order of the structural nature frequency and mode shapes wereobtained by the modal analysis. Seismic response simulation results show that themaximal displacement and acceleration increases with the increasing of intensity, theseismic amplification coefficient gradually decrease, which indicates that the shockabsorption effect of semi-rigid connection mortise-tenon in major earthquake is better than that in moderate earthquake and minor earthquake.The monolayer hall-style ancient timber structure,due to its unique constructionfeatures,the seismic behavior is different from modern buildings.The existing dynamicanalysis model of structure is no longer suitable for ancient timber structure Based onits mechanical behavior and dynamic failure mode under the horizontal earthquakeaction,the equivalent models of the key members of which the column frame wassimplified as‘rocking column’and the bucket arches was simplified as ‘shear-bendingmember’were put forward.According to the equivalent models and mass distribution ofthe whole structure,‘rocking-shear-bending’ dynamic analysis model for monolayerhall-style ancient timber structure was proposed,the analysis method and applicationrange of each parameter based on component test and theoretical derivation of dynamicswere obtained.The results of analysis model were compared with experimentalresults.It is found that the test results agree with analysis results,which shows that theproposed dynamic analysis model can reflect the dynamic response of the monolayerhall-style ancient timber structure under the horizontal seismic action.At last, the flexural capacity equations of mortise-tenon joint strengthened withCFRP and steel flat were proposed combined with damaged performance ofstrengthened joints, and the reasonable strengthening design method was also proposed,which would provide theoretical basis to the reinforcement of ancient timber structure.

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CLC: > Industrial Technology > Building Science > Building structure > The structure of the soil, brick, stone,bamboo,wood > Bamboo,wood structure > Wooden structure
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