Study On The Corrective And Reset Technology System Of Ancient Timber Building Frames

The ancient timber structure is famous in the world for its unique structural feather. It is a treasure of the Chinese nation, which carries the traditional culture. However, the changes in the material properties, the damage to components and the structural leaning, displacement, torsion have happened inevitably in the structure, which have undermined the structural safety and cultural values. Thus, the research on deviation rectification technique of the timber structure has been researched according to its leaning causes, which would not only provide actual engineering with theoretical foundation but also supply reference to the rectified research on ancient timber structure.In this paper, Feiyun pagoda in Shanxi and the ancient timber house owned by Fujiu Zhou in Yangzhou were selected as the research specimens to develop the technology of construction, modern installations, and the structural analysis of deviation rectification. The main content is listed as following:(1) Three kinds of method for deviation rectification, "integral pretension","prop integrally"and"the mixture of stretch and prop", were supposed and the deviation rectification technological system, its range of application, construction process were researched, which were concluded from the possible deviation rectification technique that combined the analysis of the traditional rectified technology and the effect factors such as timber structural feature, construction sites, construction equipment. According to the general goal of the rectified project, the process of the construction was disassembled, step by step monitoring, check technique during the construction was supposed, and the rectified loading test scheme was formulated.(2) The methods of numerical simulation and the checking calculation of structure safety were researched in terms of the controlling object during the construction, which according to the deformation behaviour and the structural working performance of the leaning timber structure. The beam element was selected to simulate the members of the timber structure such as beams and columns. In addition, the timber structural connection nodes were simplified and replaced by resilient nodal points for simulating nodal rotary movement, slip deformation. A model was established to calculate the deformation and the internal force of the timber structure during the simulative rectified process by ANSYS. Thus, the deformation behaviors and the weakest members of the timber structure were obtained by the simulated results. In addition, the process intervention and the measures of the structural safety protection were supposed. Furthermore, the loading force system and the controlling parameters were formulated, which could provide the reference for actual rectified construction.(3)The semi-automatic controlled rectified equipment was developed combined the knowledge of Modern Mechanical Principles, Automatic Control Sciences with the main technical index that according to the rectified object. The structure space was divided into 3-components of X, Y Z direction, and many groups of the hydraulic equipment were located in the corresponding places to achieve the objective spatial displacement of the actuators. The displacement sensor and pressure sensor were installed to measure the change of spatial displacements and loads. Then, the operating position of the equipment could be controlled automatically by the control system to achieve the rectified goal.(4) The theory and the test of the application of deviation rectification technique were researched. The geometric dimension, wood property, damage situation of the Feiyun pagoda were obtained by field measurement. By analysing the structural system and construction situation, the measure that envelop enclosure, secondary structure was taked apart and the major structure was rectified in situ was supposed. In addition, the structural feasibility of this scheme was analyzed and the rectified force system was developed. Furthermore, a model at the scale 1:3 was made based on the structural feather and leaning situation of the ancient house owned by Fujiu Zhou in Yangzhou, then a rectified equipment was developed and the leaning, rectified situation was simulated by numerical simulation. The different tests were conducted according to the different rectified objects, which could provide the theoretical basis and technical support for the further rectified research.In this paper, some beneficial exploration has been done in terms of deviation rectification technique and equipment development. However, due to the complicated leaning causes of the ancient timber structure, it is difficult to simulate the inner damage situation and connected node of the timber structure during the numerical simulation. In addition, the analytical model could not be matched with the actual situation well, which may affect the accuracy on the rectified control. These problems were needed to do research further.