采動區(qū)新型自伸長支座的研發(fā)及應(yīng)用研究
發(fā)布時間：2018-10-26 18:52
【摘要】：隨著地下資源的大規(guī)模開采以及各種地下工程的興建等,地表變形對上部建筑結(jié)構(gòu)的危害不容忽視,傳統(tǒng)的抗變形保護(hù)措施采用提高整體結(jié)構(gòu)剛度或者被動保護(hù)措施等,不經(jīng)濟(jì)且無法從根本上消除地表變形,因此提出新型建筑結(jié)構(gòu)的抗變形措施具有重要意義。故本文研發(fā)了一種新型自伸長支座裝置抵抗豎向不均勻沉降變形,通過試驗(yàn)研究和有限元模擬的方法對其性能進(jìn)行了研究,并對支座裝置的設(shè)計(jì)和使用提出了改進(jìn)意見,本文的主要研究內(nèi)容和結(jié)論如下:首先研發(fā)了新型自伸長支座裝置。引用摩擦自鎖原理,研發(fā)的支座裝置由外套筒、楔形塊、內(nèi)筒組成,外套筒和基礎(chǔ)連接,內(nèi)筒與框架柱腳相連,該裝置可以感應(yīng)到地表不均勻沉降,發(fā)生自伸長,使上部結(jié)構(gòu)處于同一水平面,有效減少地基不均勻沉降的破壞作用,增強(qiáng)結(jié)構(gòu)可靠性。根據(jù)實(shí)際工程資料設(shè)計(jì)了支座尺寸,并加工、制作了該支座裝置。通過力學(xué)試驗(yàn)研究了新型自伸長支座裝置的自伸長特性和承載能力。試驗(yàn)表明:其自伸長特性在滿足一定條件下可以實(shí)現(xiàn),即基礎(chǔ)和外套筒向下的重力大于外套筒所受的向上的摩擦力,向下運(yùn)動伸長,而且支座裝置伸長自鎖后也能滿足承載力要求。支座裝置具有良好的承載能力,可以滿足設(shè)計(jì)要求,破壞狀態(tài)為延性破壞。為提高支座的承載力和剛度,提出加厚外套筒內(nèi)壁的建議。對新型自伸長支座裝置進(jìn)行了ABAQUS有限元建模與分析。分析了支座在垂直偏心荷載作用下的承載性能、各個部件的受力狀況與工作原理,并將模擬結(jié)果與試驗(yàn)結(jié)果進(jìn)行對比,探討采用數(shù)值模擬方法對該支座工作性能進(jìn)行分析研究的可行性。結(jié)果表明:支座的各個部件設(shè)置合理;破壞均體現(xiàn)在外套筒內(nèi)壁屈服和混凝土拉裂,兩者整體趨勢非常吻合;表明可以采用有限元模擬的方法對新型自伸長支座裝置的性能進(jìn)行分析。采用SAP2000有限元分析了支座裝置與鋼框架協(xié)同作用性能。建立了帶支座鋼框架和普通鋼框架有限元模型,進(jìn)行了豎向正、負(fù)曲率,傾斜變形三種導(dǎo)致基礎(chǔ)不均勻沉降的模擬。支座模型簡化為縫單元,模擬支座在結(jié)構(gòu)中受力特性。通過對兩類框架在豎向地表變形下,柱、基礎(chǔ)沉降差變化和結(jié)構(gòu)上部附加內(nèi)力的變化規(guī)律的對比,得出支座在地表不均勻沉降中具有優(yōu)良的自伸長機(jī)械性能,及減弱上部結(jié)構(gòu)不利內(nèi)力的良好效果。本文研究驗(yàn)證了自伸長支座裝置是新型的、便捷的、有效的一種建筑物抗變形保護(hù)裝置。因此論文最后對上述研究內(nèi)容和成果做了簡單的總結(jié),并展望了進(jìn)一步研究的方向和需要進(jìn)行的工作,希望以后可以完善支座裝置并且能夠運(yùn)用到實(shí)際當(dāng)中。
[Abstract]:With the large-scale exploitation of underground resources and the construction of various underground projects, the damage of surface deformation to the superstructure can not be ignored. The traditional anti-deformation protection measures include improving the stiffness of the whole structure or passive protection measures, etc. Therefore, it is of great significance to put forward anti-deformation measures for new building structures. In this paper, a new type of self-elongation support is developed to resist the vertical uneven settlement, and its performance is studied by means of experimental research and finite element simulation, and some suggestions for improving the design and application of the support are put forward. The main research contents and conclusions are as follows: firstly, a new self-elongation support device is developed. According to the principle of friction self-locking, the developed support device is composed of outer sleeve, wedge block, inner cylinder, outer sleeve and foundation connection. The inner cylinder is connected to the foot of frame column. The superstructure is located in the same horizontal plane, which can effectively reduce the failure of uneven settlement of the foundation and enhance the reliability of the structure. According to the actual engineering data, the support size is designed and processed, and the support device is made. The self-elongation characteristics and bearing capacity of the new self-elongation support are studied by mechanical tests. The test results show that the self-elongation characteristics can be realized under certain conditions, that is, the downward gravity of the foundation and the outer sleeve is greater than the upward friction force of the outer sleeve, and the downward motion is elongated. And the bearing device can also meet the bearing capacity requirement after elongation self-locking. Bearing device has good bearing capacity, can meet the design requirements, the failure state is ductile failure. In order to improve the bearing capacity and stiffness of the bearing, the suggestion of thickening the inner wall of the outer sleeve is put forward. The ABAQUS finite element modeling and analysis of the new self-elongation support is carried out. The bearing capacity of the bearing under the action of vertical eccentric load, the stress condition and working principle of each component are analyzed, and the simulation results are compared with the experimental results. The feasibility of using numerical simulation method to analyze and study the working performance of the bearing is discussed. The results show that the components of the bearing are reasonable, the failure reflects the yield of the inner wall of the outer sleeve and the crack of concrete, and the overall trend of the two is very consistent. It shows that the performance of the new self-elongation support can be analyzed by finite element simulation. The SAP2000 finite element method is used to analyze the synergistic action between the support device and the steel frame. The finite element models of steel frame with bearing and common steel frame are established, and the vertical positive curvature, negative curvature and inclined deformation are simulated to result in uneven settlement of foundation. The support model is simplified as a joint element to simulate the bearing force characteristics in the structure. By comparing the variation of column, foundation settlement difference and the additional internal force in the upper part of the structure under vertical ground deformation of the two kinds of frames, it is concluded that the bearing has excellent self-elongation mechanical performance in the uneven settlement of the ground surface. And the good effect of reducing the unfavorable internal force of the superstructure. In this paper, it is proved that the self-elongation support is a new, convenient and effective building anti-deformation protective device. In the end, the paper makes a brief summary of the above research contents and results, and looks forward to the direction of further research and the work that needs to be carried out. It is hoped that the pedestal device can be perfected and applied to practice in the future.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU391
[Abstract]:With the large-scale exploitation of underground resources and the construction of various underground projects, the damage of surface deformation to the superstructure can not be ignored. The traditional anti-deformation protection measures include improving the stiffness of the whole structure or passive protection measures, etc. Therefore, it is of great significance to put forward anti-deformation measures for new building structures. In this paper, a new type of self-elongation support is developed to resist the vertical uneven settlement, and its performance is studied by means of experimental research and finite element simulation, and some suggestions for improving the design and application of the support are put forward. The main research contents and conclusions are as follows: firstly, a new self-elongation support device is developed. According to the principle of friction self-locking, the developed support device is composed of outer sleeve, wedge block, inner cylinder, outer sleeve and foundation connection. The inner cylinder is connected to the foot of frame column. The superstructure is located in the same horizontal plane, which can effectively reduce the failure of uneven settlement of the foundation and enhance the reliability of the structure. According to the actual engineering data, the support size is designed and processed, and the support device is made. The self-elongation characteristics and bearing capacity of the new self-elongation support are studied by mechanical tests. The test results show that the self-elongation characteristics can be realized under certain conditions, that is, the downward gravity of the foundation and the outer sleeve is greater than the upward friction force of the outer sleeve, and the downward motion is elongated. And the bearing device can also meet the bearing capacity requirement after elongation self-locking. Bearing device has good bearing capacity, can meet the design requirements, the failure state is ductile failure. In order to improve the bearing capacity and stiffness of the bearing, the suggestion of thickening the inner wall of the outer sleeve is put forward. The ABAQUS finite element modeling and analysis of the new self-elongation support is carried out. The bearing capacity of the bearing under the action of vertical eccentric load, the stress condition and working principle of each component are analyzed, and the simulation results are compared with the experimental results. The feasibility of using numerical simulation method to analyze and study the working performance of the bearing is discussed. The results show that the components of the bearing are reasonable, the failure reflects the yield of the inner wall of the outer sleeve and the crack of concrete, and the overall trend of the two is very consistent. It shows that the performance of the new self-elongation support can be analyzed by finite element simulation. The SAP2000 finite element method is used to analyze the synergistic action between the support device and the steel frame. The finite element models of steel frame with bearing and common steel frame are established, and the vertical positive curvature, negative curvature and inclined deformation are simulated to result in uneven settlement of foundation. The support model is simplified as a joint element to simulate the bearing force characteristics in the structure. By comparing the variation of column, foundation settlement difference and the additional internal force in the upper part of the structure under vertical ground deformation of the two kinds of frames, it is concluded that the bearing has excellent self-elongation mechanical performance in the uneven settlement of the ground surface. And the good effect of reducing the unfavorable internal force of the superstructure. In this paper, it is proved that the self-elongation support is a new, convenient and effective building anti-deformation protective device. In the end, the paper makes a brief summary of the above research contents and results, and looks forward to the direction of further research and the work that needs to be carried out. It is hoped that the pedestal device can be perfected and applied to practice in the future.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU391
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