預應力鋼絲螺距對PCCP受力性能影響分析
發(fā)布時間：2018-12-11 15:50
【摘要】：預應力鋼筒混凝土管（PCCP）作為復合型管材兼有鋼管和混凝土管的優(yōu)點，被越來越多地應用于輸水工程中，因此近年來對于PCCP的研究越來越得到重視。由于PCCP自身的結構特點，預應力鋼絲對于PCCP的承載能力和受力性能十分重要，但是當前針對預應力鋼絲螺距對PCCP受力性能的影響還是空白。本文擬通過分析研究預應力鋼絲螺距對PCCP受力性能的影響規(guī)律，為工業(yè)界在PCCP結構設計時相同配筋率下鋼絲與螺距的科學選取提供依據(jù)；并通過二維、三維有限元對比分析，試圖建立從三維分析模型向二維分析模型轉(zhuǎn)化的簡化方法。具體工作如下： （1）基于國內(nèi)外有關PCCP有限元研究現(xiàn)狀的分析，重點探討了PCCP建模過程中存在的難點及可能的解決方法；并結合前人研究基礎及實際工程問題的需要，分析建立了本文研究的重點內(nèi)容，即研究預應力鋼絲螺距對PCCP受力性能的影響以及探索三維分析模型向二維分析模型轉(zhuǎn)換的方法。 （2）基于Olander分布系數(shù)法，針對具體算例，分析計算了PCCP上作用的土荷載、管自重、流體自重以及內(nèi)水壓力的大小和分布形態(tài)。 （3）基于PCCP結構自身的受力特點，構建了適用于PCCP受力分析的平面應變模型。進行了正常使用極限狀態(tài)和承載力極限狀態(tài)下（總計11種工況）的PCCP的受力狀態(tài)分析，得到各工況下PCCP各部位的應力應變響應。 （4）為研究鋼絲螺距對PCCP受力性能的影響，本文建立了鋼絲螺距分別為0.010m、0.014m、0.017m、0.020m、0.023m、0.026m、0.029m、0.032m、0.035m、0.038m10組PCCP三維模型（該三維模型軸向網(wǎng)格的劃分恰好與鋼絲的螺距一致）。通過該10組模型在WT3和FWT6兩種工況下PCCP的受力分析，得出以下規(guī)律：在工況WT3作用下管中位置的內(nèi)層管芯，除了個別的螺距外，應力值基本保持不變，在管端位置隨著螺距的增大而減�。辉诠rFWT6作用下，管芯各部分的應力隨著螺距的增大呈現(xiàn)逐漸減小的趨勢。 （5）通過二維模型和三維模型的應力對比分析，得出了三維模型向二維模型轉(zhuǎn)換的公式：M3k M2，其中M3為三維模型計算得到的應力值，為預應力鋼絲螺距，，M2為二維模型計算出的應力值，k為三維模型向二維模型的簡化系數(shù)。
[Abstract]:Prestressed steel cylinder concrete pipe (PCCP) is more and more widely used in water conveyance engineering, as the composite pipe has the advantages of both steel tube and concrete pipe, so in recent years, more and more attention has been paid to the research of PCCP. Because of the structural characteristics of PCCP, prestressed steel wire is very important to the bearing capacity and mechanical performance of PCCP, but the influence of pitch of prestressed steel wire on the mechanical performance of PCCP is still blank. In this paper, the influence of the pitch of prestressed steel wire on the mechanical properties of PCCP is analyzed and studied, which provides the basis for the scientific selection of steel wire and pitch in industry under the same reinforcement ratio in the design of PCCP structure. Through the comparative analysis of two-dimensional and three-dimensional finite element, the simplified method of transforming from three-dimensional analysis model to two-dimensional analysis model is established. The specific work is as follows: (1) based on the analysis of the current situation of PCCP finite element research at home and abroad, the difficulties and possible solutions in the process of PCCP modeling are discussed. According to the needs of previous research foundation and practical engineering problems, the main contents of this paper are analyzed and established, that is, to study the influence of prestressed steel wire pitch on the mechanical properties of PCCP and to explore the method of transforming 3D analysis model to two-dimensional analysis model. (2) based on the Olander distribution coefficient method, the size and distribution of soil load, pipe weight, fluid weight and internal water pressure on PCCP are analyzed and calculated. (3) based on the stress characteristics of PCCP structure, a plane strain model suitable for PCCP stress analysis is constructed. The stress state analysis of PCCP under the limit state of normal use and the ultimate state of bearing capacity (11 working conditions in total) is carried out, and the stress-strain response of each part of PCCP under each condition is obtained. (4) in order to study the effect of steel wire pitch on the mechanical properties of PCCP, the steel wire pitch is 0.010 mU 0.014 mU 0.017 mU 0.020 mU 0.023 mN 0.026 mN 0.029 mU 0.032 mU 0.035 m, respectively. 0.038m10 group PCCP 3D model (the axial mesh division of the 3D model is exactly the same as the pitch of steel wire). Through the stress analysis of the 10 groups of models under WT3 and FWT6 conditions, the following laws are obtained: the stress value of the inner tube core in the position of the tube under the action of WT3 is basically unchanged except for the individual pitch. The position at the end of the pipe decreases with the increase of pitch. Under the action of FWT6, the stress of each part of the tube core decreases gradually with the increase of pitch. (5) by comparing and analyzing the stress of 2D model and 3D model, the conversion formula of 3D model to 2D model is obtained: M3k M2, where M3 is the stress value calculated by 3D model, and is the pitch of prestressed steel wire. M2 is the stress value calculated by the two-dimensional model and k is the simplified coefficient from the three-dimensional model to the two-dimensional model.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU398.9
本文編號：2372812
[Abstract]:Prestressed steel cylinder concrete pipe (PCCP) is more and more widely used in water conveyance engineering, as the composite pipe has the advantages of both steel tube and concrete pipe, so in recent years, more and more attention has been paid to the research of PCCP. Because of the structural characteristics of PCCP, prestressed steel wire is very important to the bearing capacity and mechanical performance of PCCP, but the influence of pitch of prestressed steel wire on the mechanical performance of PCCP is still blank. In this paper, the influence of the pitch of prestressed steel wire on the mechanical properties of PCCP is analyzed and studied, which provides the basis for the scientific selection of steel wire and pitch in industry under the same reinforcement ratio in the design of PCCP structure. Through the comparative analysis of two-dimensional and three-dimensional finite element, the simplified method of transforming from three-dimensional analysis model to two-dimensional analysis model is established. The specific work is as follows: (1) based on the analysis of the current situation of PCCP finite element research at home and abroad, the difficulties and possible solutions in the process of PCCP modeling are discussed. According to the needs of previous research foundation and practical engineering problems, the main contents of this paper are analyzed and established, that is, to study the influence of prestressed steel wire pitch on the mechanical properties of PCCP and to explore the method of transforming 3D analysis model to two-dimensional analysis model. (2) based on the Olander distribution coefficient method, the size and distribution of soil load, pipe weight, fluid weight and internal water pressure on PCCP are analyzed and calculated. (3) based on the stress characteristics of PCCP structure, a plane strain model suitable for PCCP stress analysis is constructed. The stress state analysis of PCCP under the limit state of normal use and the ultimate state of bearing capacity (11 working conditions in total) is carried out, and the stress-strain response of each part of PCCP under each condition is obtained. (4) in order to study the effect of steel wire pitch on the mechanical properties of PCCP, the steel wire pitch is 0.010 mU 0.014 mU 0.017 mU 0.020 mU 0.023 mN 0.026 mN 0.029 mU 0.032 mU 0.035 m, respectively. 0.038m10 group PCCP 3D model (the axial mesh division of the 3D model is exactly the same as the pitch of steel wire). Through the stress analysis of the 10 groups of models under WT3 and FWT6 conditions, the following laws are obtained: the stress value of the inner tube core in the position of the tube under the action of WT3 is basically unchanged except for the individual pitch. The position at the end of the pipe decreases with the increase of pitch. Under the action of FWT6, the stress of each part of the tube core decreases gradually with the increase of pitch. (5) by comparing and analyzing the stress of 2D model and 3D model, the conversion formula of 3D model to 2D model is obtained: M3k M2, where M3 is the stress value calculated by 3D model, and is the pitch of prestressed steel wire. M2 is the stress value calculated by the two-dimensional model and k is the simplified coefficient from the three-dimensional model to the two-dimensional model.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU398.9
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本文編號：2372812
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