內(nèi)填植物纖維生土基砌塊生態(tài)復(fù)合墻體斜截面極限承載力可靠度分析
[Abstract]:In order to improve the seismic capacity of the traditional raw soil houses and realize the ecological energy saving of the traditional raw soil houses, the research group organically combines the ecological composite wall structure with the traditional raw soil houses, and makes up for each other's weaknesses and takes advantage of each other. A kind of ecological composite wall structure of plant fiber raw soil block is put forward. The structure system not only inherits the good seismic performance of the ecological composite wall structure, but also has the excellent characteristics of raw soil materials according to local conditions, energy saving and environmental protection. It realizes the unity of structural safety, suitability and good economy. In this paper, by means of experimental study, theoretical analysis and numerical simulation, the stress mechanism of ecological composite wall with plant fiber raw soil block is explained, and the calculation formula of ultimate bearing capacity of inclined cross section of wall based on reliability theory is established. It provides theoretical basis for engineering application. This paper focuses on the following problems: (1) the main preparation process and process of vegetable fiber raw soil block are introduced. The mechanical properties of filling blocks were studied by mechanical properties test, and the basic physical and mechanical properties of the materials were obtained. The uniaxial compression constitutive equation of the material was fitted by linear regression analysis, and the uniaxial stress-strain constitutive relation was constructed by two straight lines. The low cycle repeated load test was carried out on 4 ecological composite walls with 1 / 2 ratio of plant fiber raw soil block. The seismic performance such as carrying capacity, hysteretic characteristics and displacement ductility of the wall were analyzed in terms of frame form, aspect ratio, and hysteretic property. The test results show that: the botanical fiber raw earth block is restrained by frame lattice, the precast wall panel is restrained by outer frame, and the energy is released by stages of each component, the functional partition of wall is realized, and the wall has multi-seismic defense line; The wall XML-1,ECW-2 has reasonable shear failure of "strong column and weak plate", the wall ECW-3 has unfavorable "strong plate and weak column" bending failure, and the ECW-4 with large height and width has unfavorable bending and shear failure mode. In the engineering, we should pay attention to the partition of the panel, frame and lattice and the aspect ratio control. From the yield stage to the failure stage, the ductility of the wall is better, the equivalent viscous damping coefficient is obviously increased, and none of the walls collapses. (2) the numerical model of the wall established by ANSYS is adopted, and the static elastoplastic analysis is carried out. The calculated results are in good agreement with the test results in the aspects of load-displacement curve and steel bar strain. On this basis, the numerical expansion analysis of the wall with the change of key parameters is carried out, and the influence of the key factors, such as the ratio of frame column reinforcement and axial compression ratio, on the elastic stiffness and bearing capacity of the wall is obtained, which is based on the experimental research and numerical results. On the basis of the ultimate equilibrium theory, the ultimate bearing capacity of the ecological composite wall with plant fiber and raw soil block is calculated, and the shear mechanism of the wall is analyzed, and the ultimate bearing capacity of the ecological composite wall is calculated. Using the experimental data and numerical results to verify the applicability of the formula. (3) based on the basic theory of random response surface, the uniform design table is introduced. Based on the improved random response surface method, a formula for calculating the reliability index of the limit state equation of the slope cross section of the ecological composite wall of the plant fiber raw soil block is presented. By using this method, a formula for calculating the ultimate bearing capacity of oblique sections based on the reliability index theory is established for the ecological composite of plant fiber raw soil blocks with inner filling, which provides a theoretical basis and a safe reserve for engineering application.
【學(xué)位授予單位】:西安建筑科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類(lèi)號(hào)】:TU311.2
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