發(fā)布時間：2018-11-10 16:09

【摘要】：隨著預(yù)應(yīng)力鋼結(jié)構(gòu)工程應(yīng)用的推廣和科學(xué)研究的深入，精細化數(shù)值模擬分析已經(jīng)成為預(yù)應(yīng)力鋼結(jié)構(gòu)全壽命狀態(tài)下受力性能分析的有效方法。預(yù)應(yīng)力鋼結(jié)構(gòu)的核心構(gòu)件拉索的膨脹系數(shù)、彈性模量以及拉索結(jié)構(gòu)阻尼的取值問題，直接影響到結(jié)構(gòu)精細化數(shù)值模擬的準確性。新型拉索結(jié)構(gòu)體系與拉索節(jié)點的研發(fā)，也給預(yù)應(yīng)力鋼結(jié)構(gòu)體系分析設(shè)計以及工程應(yīng)用帶來一系列的科學(xué)問題。本文主要圍繞上述問題，采用數(shù)值分析與試驗研究相結(jié)合的方法，開展了系統(tǒng)深入的分析研究，取得了一些具有科學(xué)意義和工程應(yīng)用價值的研究成果： 建立了溫度作用下預(yù)應(yīng)力鋼結(jié)構(gòu)核心構(gòu)件拉索的變形協(xié)調(diào)方程，，推導(dǎo)了拉索材料線膨脹系數(shù)的解析公式；基于拉索熱膨脹基本方程，研發(fā)出空氣加熱拉索線膨脹系數(shù)測定試驗設(shè)備，測定了鋼絲繩、鋼絞線和鋼絲束的線膨脹系數(shù)，驗證了拉索熱膨脹理論分析方法；研究了拉索熱膨脹性能對弦支筒殼結(jié)構(gòu)的性能的影響，并通過跨度約3.3米的弦支筒殼縮尺模型試驗進行了驗證。相關(guān)研究成果編入行業(yè)標準《預(yù)應(yīng)力鋼結(jié)構(gòu)技術(shù)規(guī)程》和地方規(guī)程《天津市空間網(wǎng)格結(jié)構(gòu)技術(shù)規(guī)程》； 建立了受力狀態(tài)下預(yù)應(yīng)力鋼結(jié)構(gòu)核心構(gòu)件拉索的變形協(xié)調(diào)方程，推導(dǎo)了拉索彈性模量計算公式，提出鋼拉索彈性模量降低系數(shù)，揭示了絞捻方式、捻距、繞捻半徑以及溫度作用對鋼拉索彈性模量影響規(guī)律；研究了不同拉索失效后對弦支穹頂穩(wěn)定性能的影響規(guī)律； 開展了弦支筒殼結(jié)構(gòu)動力特性試驗研究，分析了弦支筒殼結(jié)構(gòu)矢跨比和垂跨比對其動力特性的影響；基于大跨度空間結(jié)構(gòu)動力特性的復(fù)雜性與OKID系統(tǒng)識別方法的可靠性，提出一種適合弦支結(jié)構(gòu)的動力特性識別新方法。通過一個弦支穹頂結(jié)構(gòu)算例驗證了方法的有效性和合理性，揭示了拉索索力，測點數(shù)量與布置，輸出信號等對識別精度的影響規(guī)律； 提出一種新型拉索補強型焊接相貫節(jié)點；通過破壞性試驗和實物驗證性試驗與有限元數(shù)值模擬，系統(tǒng)研究了拉索補強型焊接相貫節(jié)點的受力性能與破壞模式。同時采用云紋干涉法有效解決了受力復(fù)雜區(qū)域電測時漏檢誤判的技術(shù)難題，全面驗證了拉索補強型焊接相貫節(jié)點的安全性和可靠性。
[Abstract]:With the development of engineering application and scientific research of prestressed steel structures, refined numerical simulation analysis has become an effective method for the analysis of mechanical behavior of prestressed steel structures under the condition of full life. The problems of the expansion coefficient, elastic modulus and damping of the core member of prestressed steel structure directly affect the accuracy of the detailed numerical simulation of the structure. The research and development of new cable structure system and cable joint also bring a series of scientific problems to the analysis design and engineering application of prestressed steel structure system. This paper mainly focuses on the above problems, using the method of the combination of numerical analysis and experimental research to carry out systematic and in-depth analysis and research. Some research results of scientific significance and engineering application value are obtained: the deformation coordination equation of prestressed steel core members under the action of temperature is established and the analytical formula of linear expansion coefficient of cable material is derived; Based on the basic equation of cable thermal expansion, a test equipment for measuring the linear expansion coefficient of air heated cable is developed. The linear expansion coefficient of wire rope, steel strand and steel wire bundle is measured, and the theoretical analysis method of cable thermal expansion is verified. The influence of thermal expansion property of cable on the performance of chord supported cylindrical shell structure is studied and verified by the model test of chord supported shell with a span of about 3.3 meters. The related research results are compiled into the industry standard "Technical Specification for Prestressed Steel structures" and the Local regulations "Technical Specification for Spatial Grid structures in Tianjin". In this paper, the deformation coordination equation of prestressed steel structure core member cable is established, the formula for calculating elastic modulus of cable is derived, the coefficient of decreasing elastic modulus of steel cable is put forward, and the twisting mode and the twist distance are revealed. The influence of twisting radius and temperature on elastic modulus of steel cable; The influence of different cable failure on the stability performance of chord dome is studied, and the dynamic characteristics of chord supported cylindrical shell structure are studied, and the influence of the rise-span ratio and vertical span ratio of chord supported cylindrical shell structure on its dynamic characteristics is analyzed. Based on the complexity of the dynamic characteristics of long-span spatial structures and the reliability of the identification method for OKID systems, a new method for identifying the dynamic characteristics of chord-supported structures is proposed. The validity and rationality of the method are verified by a numerical example of a chord dome structure, and the influence of cable force, number and arrangement of measuring points and output signal on the identification accuracy is revealed. A new type of cable reinforced welded intersecting joint is proposed, and the mechanical behavior and failure mode of cable reinforced welded intersecting joint are systematically studied by destructive test, physical verification test and finite element numerical simulation. At the same time, the moire interference method is used to solve the technical problem of missed detection and misjudgment during electrical measurement in complex areas, and the safety and reliability of cable reinforced welded intersecting joints are fully verified.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TU394

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