波形钢腹板PC组合箱梁改进型埋入式剪力键静力性能研究
发布时间：2018-11-20 11:11
【摘要】：随着现代桥梁科学技术的飞速的发展,桥梁上部结构自重成为阻碍其自身跨越能力的关键性因素,波形钢腹板PC组合箱梁桥应运而生,由于其轻薄的结构特点和强大的承载能力,近年来在全世界范围内得到广泛认可,并在桥梁界内地位日益稳固。为适应波形钢腹板PC组合箱梁桥的进一步发展,本文对改进型埋入式剪力键的静力性能和破坏形态展开了深入全面的分析研究,并通过试验研究和有限元三维仿真模拟进行对比分析,推出具有广泛普适性的改进型埋入式剪力键的承载力计算公式。为此,本文进行了如下几方面的工作:①对波形钢腹板PC组合箱梁桥的发展历程和剪力键在国内外的发展研究情况以及常用剪力键种类和应用情况进行了简要的介绍;②通过本文依托工程—花天河大桥波形钢腹板PC组合箱梁桥连续钢构设计方案的工程概况的介绍引入了本文的研究对象—改进型埋入式剪力键,并对其构造形式进行了简要的介绍;③以推出试验的方式对改进型埋入式剪力键和被大家所熟知的S-PBL剪力键的静力性能和破坏形态进行对比试验,并分析研究其受力破坏机理;同时设计了5组更改不同影响因素的结构尺寸的改进型埋入式剪力键,观察并记录其试验结果并与标准尺寸的改进型埋入式剪力键进行比较分析,发现试验所得改进型埋入式剪力键的极限承载力约为S-PBL极限承载力的2倍。④依靠有限元基本理论,以有限元非线性计算软件Midas/FEA对改进型埋入式剪力键进行三维实体有限元分析,并通过与试验所得的静力性能和破坏形态进行对比分析论证有限元计算结果的可靠性;⑤对惯常研究的影响剪力键承载能力主要影响因素进行有限元理论分析,并将有限元所得值与实验值进行对比分析,确定改进型埋入式剪力键承载能力的关键性影响因素,并通过计算比较确定了各静力性能影响因素的次序。⑥通过对128组有限元值和大量试验结果的多元回归分析,以及已有的PBL承载力公式的经验总结,最后推出专适于改进型埋入式剪力键的承载能力计算公式。⑦对公式的计算值与有限元值和试验值进行对比分析,验证计算值的可靠性和精确性。该公式在实际工程中运用具有广泛的普适性和安全可靠性。⑧通过对改进型埋入式剪力键的影响因素的具体量化分析研究,结合工程实践,确定了改进型埋入式剪力键的合理构造参数取值范围。通过以上各方面的研究结果,论证了改进型埋入式剪力键较S-PBL和普通埋入式剪力键的静力性能的优越性,确定了各关键性影响因素对承载力结果的影响程度,推出了具有广泛适用性的改进型埋入式剪力键的承载力计算公式,有利于改进型埋入式剪力键的进一步推广适用。
[Abstract]:With the rapid development of modern bridge science and technology, the weight of the superstructure of the bridge becomes the key factor that hinders its ability to span, and the PC composite box girder bridge with corrugated steel webs emerges as the times require. Due to its light structure and strong bearing capacity, it has been widely recognized in the world in recent years, and has become more and more stable in the bridge boundary. In order to adapt to the further development of PC composite box girder bridge with corrugated steel webs, the static performance and failure mode of the improved embedded shear bond are studied thoroughly and thoroughly in this paper. Through the comparison and analysis between the experimental research and the finite element three-dimensional simulation, a widely applicable formula for calculating the bearing capacity of the improved embedded shear bond is proposed. For this reason, this paper has carried on the following aspects of work: 1 the development course of the PC composite box girder bridge with corrugated steel webs, the development and research situation of the shear bond at home and abroad, the types and application of the commonly used shear bond are briefly introduced; (2) through the introduction of the engineering general situation of the continuous steel structure design scheme of the PC composite box girder bridge with corrugated steel webs based on the project of Huatianhe Bridge in this paper, the research object of this paper, the modified embedded shear key, is introduced. A brief introduction to its structural form is also given. (3) the static performance and failure mode of the improved embedded shear bond and the S-PBL shear bond, which is well known to everyone, are tested by means of push-out test, and the failure mechanism of the modified embedded shear bond is analyzed and studied. At the same time, five groups of modified embedded shear keys with different influence factors are designed, and the experimental results are observed and recorded, and compared with the standard size of the modified embedded shear keys. It is found that the ultimate bearing capacity of the improved embedded shear bond is about 2 times that of S-PBL. The 3D solid finite element analysis of the improved embedded shear bond is carried out by using the finite element nonlinear calculation software Midas/FEA, and the reliability of the finite element calculation result is proved by comparing the static performance and the failure pattern with the experimental results. (5) the main influencing factors of shear bond bearing capacity are analyzed by finite element theory, and compared with the experimental value, the key factors influencing the load capacity of the improved embedded shear bond are determined. The order of influencing factors of static performance is determined by calculation and comparison. (6) based on the multivariate regression analysis of 128-group finite element values and a large number of experimental results, and the experience of the existing PBL bearing capacity formula, Finally, a formula for calculating the load-carrying capacity of the modified embedded shear bond is presented. 7 the calculation value of the formula is compared with the finite element value and the experimental value, and the reliability and accuracy of the calculated value are verified. The formula is widely used in practical engineering with universal applicability and safety reliability. 8 through the quantitative analysis of the influence factors of the improved embedded shear key, combined with the engineering practice, The reasonable value range of the structural parameters of the improved embedded shear key is determined. Through the above research results, the superiority of the improved embedded shear bond over the static performance of the S-PBL and the common embedded shear bond is demonstrated, and the influence degree of the key factors on the bearing capacity results is determined. A formula for calculating the bearing capacity of the modified embedded shear bond is presented, which is beneficial to the further popularization and application of the improved embedded shear bond.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.216
本文编号：2344752
[Abstract]:With the rapid development of modern bridge science and technology, the weight of the superstructure of the bridge becomes the key factor that hinders its ability to span, and the PC composite box girder bridge with corrugated steel webs emerges as the times require. Due to its light structure and strong bearing capacity, it has been widely recognized in the world in recent years, and has become more and more stable in the bridge boundary. In order to adapt to the further development of PC composite box girder bridge with corrugated steel webs, the static performance and failure mode of the improved embedded shear bond are studied thoroughly and thoroughly in this paper. Through the comparison and analysis between the experimental research and the finite element three-dimensional simulation, a widely applicable formula for calculating the bearing capacity of the improved embedded shear bond is proposed. For this reason, this paper has carried on the following aspects of work: 1 the development course of the PC composite box girder bridge with corrugated steel webs, the development and research situation of the shear bond at home and abroad, the types and application of the commonly used shear bond are briefly introduced; (2) through the introduction of the engineering general situation of the continuous steel structure design scheme of the PC composite box girder bridge with corrugated steel webs based on the project of Huatianhe Bridge in this paper, the research object of this paper, the modified embedded shear key, is introduced. A brief introduction to its structural form is also given. (3) the static performance and failure mode of the improved embedded shear bond and the S-PBL shear bond, which is well known to everyone, are tested by means of push-out test, and the failure mechanism of the modified embedded shear bond is analyzed and studied. At the same time, five groups of modified embedded shear keys with different influence factors are designed, and the experimental results are observed and recorded, and compared with the standard size of the modified embedded shear keys. It is found that the ultimate bearing capacity of the improved embedded shear bond is about 2 times that of S-PBL. The 3D solid finite element analysis of the improved embedded shear bond is carried out by using the finite element nonlinear calculation software Midas/FEA, and the reliability of the finite element calculation result is proved by comparing the static performance and the failure pattern with the experimental results. (5) the main influencing factors of shear bond bearing capacity are analyzed by finite element theory, and compared with the experimental value, the key factors influencing the load capacity of the improved embedded shear bond are determined. The order of influencing factors of static performance is determined by calculation and comparison. (6) based on the multivariate regression analysis of 128-group finite element values and a large number of experimental results, and the experience of the existing PBL bearing capacity formula, Finally, a formula for calculating the load-carrying capacity of the modified embedded shear bond is presented. 7 the calculation value of the formula is compared with the finite element value and the experimental value, and the reliability and accuracy of the calculated value are verified. The formula is widely used in practical engineering with universal applicability and safety reliability. 8 through the quantitative analysis of the influence factors of the improved embedded shear key, combined with the engineering practice, The reasonable value range of the structural parameters of the improved embedded shear key is determined. Through the above research results, the superiority of the improved embedded shear bond over the static performance of the S-PBL and the common embedded shear bond is demonstrated, and the influence degree of the key factors on the bearing capacity results is determined. A formula for calculating the bearing capacity of the modified embedded shear bond is presented, which is beneficial to the further popularization and application of the improved embedded shear bond.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.216
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