钢管混凝土抛物线浅拱平面内稳定性能试验研究
发布时间：2018-12-25 18:01
【摘要】：钢管混凝土拱承载力高、跨越能力强、施工方便、工程造价低、外形美观，自上世纪90年代至今20余年的时间里，，钢管混凝土拱在桥梁工程、大跨空间场馆及地下支护工程中得到了广泛的应用。目前我国已建成的钢管混凝土拱桥达400余座，且最大跨度已超过500m。相对于钢管混凝土拱桥的迅猛发展，其理论研究却并不完备，尚处于起步阶段，因此关于钢管混凝土拱桥的系统性的理论研究十分必要。 本文针对两种压弯荷载工况（跨中单点加载和1/4跨单点加载）对钢管混凝土抛物线浅拱平面内稳定性能进行试验研究和有限元分析，通过模型拱肋平面内受力全过程试验了解钢管混凝土拱平面内受力失稳全过程，得到试件平面内稳定极限承载力和破坏模式，研究钢管与混凝土之间的相互作用，分析矢跨比对试件面内稳定承载力的影响，同时为有限元分析提供试验数据。具体内容如下： （1）试验加载装置和试件设计 针对工程中常见的钢管混凝土抛物线拱，设计并进行了4根压弯作用下单圆钢管混凝土抛物线浅拱的平面内稳定承载力试验，试验的主要参数是矢跨比（1/6、1/9）和荷载类型（跨中单点加载、1/4跨单点加载），其几何跨度为9m；钢管采用Φ159×4.5mm热轧钢管，并经热弯法弯成预定形状。钢材强度等级为Q345级；混凝土设计强度等级为C40。通过理论计算和有限元建模的方法分别对拱脚支座、拱脚转换段、槽钢自平衡体系和加载装置进行了设计和验证，以确保加载装置具有足够的刚度和可靠性。 （2）压弯作用下钢管混凝土抛物线浅拱平面内稳定试验 观察并研究了整个试验过程的试验现象和试件破坏模式，得到了试件的荷载-位移曲线、试件变形图、荷载-应变分布曲线、加载点截面荷载-应变曲线以及横向变形系数，考虑了矢跨比对钢管混凝土抛物线浅拱平面内稳定承载力的影响。 （3）基于试验的有限元模型建立与验证 通过有限元分析软件ABAQUS建立了钢管混凝土抛物线浅拱的有限元模型，并将分析结果与试验结果进行了对比，在此基础上对可能影响试验结果的一些重要参数如初始缺陷、拱脚位移、槽钢自平衡体系的刚度等进行了分析。
[Abstract]:Concrete-filled steel tube arch has high bearing capacity, strong span ability, convenient construction, low construction cost and beautiful appearance. In the 20 years since 1990s, concrete filled steel tube arch has been in bridge engineering. Long span space stadiums and underground support engineering have been widely used. At present, more than 400 concrete-filled steel tubular arch bridges have been built in China, and the maximum span has exceeded 500 m. Compared with the rapid development of concrete-filled steel tubular arch bridge, its theoretical research is not complete and is still in its infancy, so it is very necessary to study the systematic theory of concrete-filled steel tubular arch bridge. In this paper, the in-plane stability of concrete-filled steel tubular parabolic arch is experimentally studied and finite element analysis is carried out for two kinds of compression and bending load conditions (single point load of span and single point loading of 1 / 4 span). The whole process of buckling in concrete filled steel tube arch plane is studied by the whole process test of model arch rib plane, and the ultimate bearing capacity and failure mode in plane are obtained, and the interaction between steel tube and concrete is studied. The influence of the rise-span ratio on the in-plane stability capacity of the specimen is analyzed, and the test data are provided for the finite element analysis. The main contents are as follows: (1) the test loading device and the test piece are designed for the common concrete filled steel tube parabola arch. The in-plane stability bearing capacity tests of four circular concrete-filled steel tubular concrete parabolic shallow arches under compression and bending are designed and carried out. The main parameters of the tests are the rise-span ratio (1 / 6 / 1 / 9) and the load type (single point load in span). 1 / 4 span single point loading), its geometric span is 9 m; 桅 159 脳 4.5mm hot-rolled steel pipe is adopted and bent to a predetermined shape by hot-bending method. The grade of steel strength is Q345 and the grade of concrete design strength is C40. By theoretical calculation and finite element modeling, the self-balancing system and loading device of arch foot support, arch foot transfer section, channel steel self-balance system and loading device are designed and verified, respectively, in order to ensure sufficient stiffness and reliability of the loading device. (2) the stability test of concrete-filled steel tube (CFST) parabola shallow arch plane under compression and bending is observed and studied. The load-displacement curve and deformation diagram of the specimen are obtained. The load-strain distribution curve, load-strain curve of loading point cross-section and transverse deformation coefficient are considered, and the influence of rise-span ratio on the stability bearing capacity of concrete filled steel tube parabola shallow arch in plane is considered. (3) the finite element model of concrete filled steel tube parabola shallow arch is established by the finite element analysis software ABAQUS, and the results are compared with the test results. On this basis, some important parameters, such as initial defects, arch foot displacement and stiffness of channel self-equilibrium system, which may affect the test results, are analyzed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.22
本文编号：2391458
[Abstract]:Concrete-filled steel tube arch has high bearing capacity, strong span ability, convenient construction, low construction cost and beautiful appearance. In the 20 years since 1990s, concrete filled steel tube arch has been in bridge engineering. Long span space stadiums and underground support engineering have been widely used. At present, more than 400 concrete-filled steel tubular arch bridges have been built in China, and the maximum span has exceeded 500 m. Compared with the rapid development of concrete-filled steel tubular arch bridge, its theoretical research is not complete and is still in its infancy, so it is very necessary to study the systematic theory of concrete-filled steel tubular arch bridge. In this paper, the in-plane stability of concrete-filled steel tubular parabolic arch is experimentally studied and finite element analysis is carried out for two kinds of compression and bending load conditions (single point load of span and single point loading of 1 / 4 span). The whole process of buckling in concrete filled steel tube arch plane is studied by the whole process test of model arch rib plane, and the ultimate bearing capacity and failure mode in plane are obtained, and the interaction between steel tube and concrete is studied. The influence of the rise-span ratio on the in-plane stability capacity of the specimen is analyzed, and the test data are provided for the finite element analysis. The main contents are as follows: (1) the test loading device and the test piece are designed for the common concrete filled steel tube parabola arch. The in-plane stability bearing capacity tests of four circular concrete-filled steel tubular concrete parabolic shallow arches under compression and bending are designed and carried out. The main parameters of the tests are the rise-span ratio (1 / 6 / 1 / 9) and the load type (single point load in span). 1 / 4 span single point loading), its geometric span is 9 m; 桅 159 脳 4.5mm hot-rolled steel pipe is adopted and bent to a predetermined shape by hot-bending method. The grade of steel strength is Q345 and the grade of concrete design strength is C40. By theoretical calculation and finite element modeling, the self-balancing system and loading device of arch foot support, arch foot transfer section, channel steel self-balance system and loading device are designed and verified, respectively, in order to ensure sufficient stiffness and reliability of the loading device. (2) the stability test of concrete-filled steel tube (CFST) parabola shallow arch plane under compression and bending is observed and studied. The load-displacement curve and deformation diagram of the specimen are obtained. The load-strain distribution curve, load-strain curve of loading point cross-section and transverse deformation coefficient are considered, and the influence of rise-span ratio on the stability bearing capacity of concrete filled steel tube parabola shallow arch in plane is considered. (3) the finite element model of concrete filled steel tube parabola shallow arch is established by the finite element analysis software ABAQUS, and the results are compared with the test results. On this basis, some important parameters, such as initial defects, arch foot displacement and stiffness of channel self-equilibrium system, which may affect the test results, are analyzed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.22
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相关期刊论文 前3条
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