基于拉索精细化物理特性的弦支结构体系力学性能研究
发布时间：2018-11-10 16:09
【摘要】：随着预应力钢结构工程应用的推广和科学研究的深入，精细化数值模拟分析已经成为预应力钢结构全寿命状态下受力性能分析的有效方法。预应力钢结构的核心构件拉索的膨胀系数、弹性模量以及拉索结构阻尼的取值问题，直接影响到结构精细化数值模拟的准确性。新型拉索结构体系与拉索节点的研发，也给预应力钢结构体系分析设计以及工程应用带来一系列的科学问题。本文主要围绕上述问题，采用数值分析与试验研究相结合的方法，开展了系统深入的分析研究，取得了一些具有科学意义和工程应用价值的研究成果： 建立了温度作用下预应力钢结构核心构件拉索的变形协调方程，，推导了拉索材料线膨胀系数的解析公式；基于拉索热膨胀基本方程，研发出空气加热拉索线膨胀系数测定试验设备，测定了钢丝绳、钢绞线和钢丝束的线膨胀系数，验证了拉索热膨胀理论分析方法；研究了拉索热膨胀性能对弦支筒壳结构的性能的影响，并通过跨度约3.3米的弦支筒壳缩尺模型试验进行了验证。相关研究成果编入行业标准《预应力钢结构技术规程》和地方规程《天津市空间网格结构技术规程》； 建立了受力状态下预应力钢结构核心构件拉索的变形协调方程，推导了拉索弹性模量计算公式，提出钢拉索弹性模量降低系数，揭示了绞捻方式、捻距、绕捻半径以及温度作用对钢拉索弹性模量影响规律；研究了不同拉索失效后对弦支穹顶稳定性能的影响规律； 开展了弦支筒壳结构动力特性试验研究，分析了弦支筒壳结构矢跨比和垂跨比对其动力特性的影响；基于大跨度空间结构动力特性的复杂性与OKID系统识别方法的可靠性，提出一种适合弦支结构的动力特性识别新方法。通过一个弦支穹顶结构算例验证了方法的有效性和合理性，揭示了拉索索力，测点数量与布置，输出信号等对识别精度的影响规律； 提出一种新型拉索补强型焊接相贯节点；通过破坏性试验和实物验证性试验与有限元数值模拟，系统研究了拉索补强型焊接相贯节点的受力性能与破坏模式。同时采用云纹干涉法有效解决了受力复杂区域电测时漏检误判的技术难题，全面验证了拉索补强型焊接相贯节点的安全性和可靠性。
[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.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TU394
[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.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TU394
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