古建筑整体平移过程中托换结构受力性能分析
发布时间：2018-12-26 15:08
【摘要】：采用建筑物整体平移技术可以对古建筑进行保护,本文根据某古塔平移工程实例,对建筑物整体平移工程托换结构存在的问题进行分析。建筑物整体平移工程中,托换结构的强度和刚度关系到上部结构的安全,本文采用ANSYS建立托换结构的有限元模型,计算托换结构托换梁的最大挠度和最大应力;建筑物平移过程中可能出现超载,为保证托换结构具有足够的安全储备,将托换结构模型加载至开裂,对托换结构的抗裂安全系数进行分析;为对托换结构梁高设计提供一定的参考依据,计算不同预应力托换梁梁高条件下托换结构的开裂允许荷载,对不同荷载作用下预应力托换梁梁高的选取提出建议;古塔在平移过程中可能出现失稳破坏,对沿轨道方向和垂直于轨道方向两种不利工况下塔体的塔底应力状态和塔顶位移进行计算,根据计算结果对古塔的稳定性进行分析。研究结果表明:在施工工况下,托换结构预应力托换梁的最大挠度为0.72mm,是梁计算跨度的1/11169,满足《混凝土结构设计规范》对受弯构件挠度的要求;托换结构的预应力托换梁混凝土最大拉应力值为1.73MPa,小于C40混凝土抗拉强度标准值2.39MPa,混凝土最大压应力小于混凝土抗压强度标准值,托换结构混凝土不会发生开裂或压碎。托换结构的抗裂安全储备系数为1.6,大于预应力混凝土受弯构件的安全系数允许值1.5。设计的托换结构能够满足工程安全性要求,且具有足够的抗裂承载能力安全储备。在沿轨道方向不利工况下,古塔的底部应力处于全截面受压状态,塔顶的最大位移较小,古塔在平移过程中的稳定性满足工程要求;在垂直轨道方向的不利工况下,古塔的稳定性不能按照塔底的应力状态判定,应通过控制塔体的倾斜角度保证古塔的稳定性。
[Abstract]:According to the example of an ancient pagoda translation project, the problems existing in the underpinning structure of the building integral translation engineering can be analyzed in this paper. The strength and stiffness of the underpinning structure are related to the safety of the superstructure in the whole translational engineering of the building. In this paper, the finite element model of the underpinning structure is established by ANSYS, and the maximum deflection and the maximum stress of the underpinning beam of the underpinning structure are calculated. In order to ensure the sufficient safety reserve of the underpinning structure, the model of the underpinning structure is loaded into the crack, and the anti-crack safety factor of the underpinning structure is analyzed. In order to provide a certain reference for the design of the beam height of the underpinning structure and calculate the allowable cracking load of the underpinning structure under different pre-stressed beam height conditions, some suggestions are put forward for the selection of the height of the pre-stressed underpinning beam under different loads. In the process of translation, the tower may lose stability. The stress state of tower bottom and the displacement of tower top are calculated under two unfavorable working conditions along the track direction and perpendicular to the track direction, and the stability of the tower is analyzed according to the calculation results. The results show that under construction conditions, the maximum deflection of prestressed underpinning beam is 0.72 mm, which is 1 / 11169 of the calculated span of beam, which meets the requirements of deflection of flexural members in the Code for Design of concrete structures. The maximum tensile stress of prestressed underpinning beam is 1.73 MPa, and the maximum compressive stress of concrete is less than the standard value of compressive strength of concrete, which is less than the standard value of C40 concrete tensile strength 2.39 MPa, and the maximum compressive stress of concrete is less than the standard value of concrete compressive strength. The underpinning structure concrete will not crack or crush. The fracture safety reserve coefficient of underpinning structure is 1.6, which is larger than the allowable value of safety factor of prestressed concrete flexural members. The designed underpinning structure can meet the requirements of engineering safety and has sufficient safety reserve of anti-crack bearing capacity. Under the unfavorable working conditions along the track direction, the stress at the bottom of the tower is in the state of full cross-section compression, and the maximum displacement of the tower top is smaller, and the stability of the tower in the process of translation meets the engineering requirements. The stability of the ancient pagoda can not be judged according to the stress state of the bottom of the tower under the adverse working condition of the vertical track, and the stability of the ancient tower should be ensured by controlling the inclined angle of the tower body.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU311;TU746.4
本文编号：2392300
[Abstract]:According to the example of an ancient pagoda translation project, the problems existing in the underpinning structure of the building integral translation engineering can be analyzed in this paper. The strength and stiffness of the underpinning structure are related to the safety of the superstructure in the whole translational engineering of the building. In this paper, the finite element model of the underpinning structure is established by ANSYS, and the maximum deflection and the maximum stress of the underpinning beam of the underpinning structure are calculated. In order to ensure the sufficient safety reserve of the underpinning structure, the model of the underpinning structure is loaded into the crack, and the anti-crack safety factor of the underpinning structure is analyzed. In order to provide a certain reference for the design of the beam height of the underpinning structure and calculate the allowable cracking load of the underpinning structure under different pre-stressed beam height conditions, some suggestions are put forward for the selection of the height of the pre-stressed underpinning beam under different loads. In the process of translation, the tower may lose stability. The stress state of tower bottom and the displacement of tower top are calculated under two unfavorable working conditions along the track direction and perpendicular to the track direction, and the stability of the tower is analyzed according to the calculation results. The results show that under construction conditions, the maximum deflection of prestressed underpinning beam is 0.72 mm, which is 1 / 11169 of the calculated span of beam, which meets the requirements of deflection of flexural members in the Code for Design of concrete structures. The maximum tensile stress of prestressed underpinning beam is 1.73 MPa, and the maximum compressive stress of concrete is less than the standard value of compressive strength of concrete, which is less than the standard value of C40 concrete tensile strength 2.39 MPa, and the maximum compressive stress of concrete is less than the standard value of concrete compressive strength. The underpinning structure concrete will not crack or crush. The fracture safety reserve coefficient of underpinning structure is 1.6, which is larger than the allowable value of safety factor of prestressed concrete flexural members. The designed underpinning structure can meet the requirements of engineering safety and has sufficient safety reserve of anti-crack bearing capacity. Under the unfavorable working conditions along the track direction, the stress at the bottom of the tower is in the state of full cross-section compression, and the maximum displacement of the tower top is smaller, and the stability of the tower in the process of translation meets the engineering requirements. The stability of the ancient pagoda can not be judged according to the stress state of the bottom of the tower under the adverse working condition of the vertical track, and the stability of the ancient tower should be ensured by controlling the inclined angle of the tower body.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU311;TU746.4
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