圆钢管再生混凝土柱压弯滞回性能研究
发布时间：2019-06-14 04:21
【摘要】：随着我国城市化进程加快，建筑业发展过程中，巨大的混凝土需求导致大量的砂石骨料的开采。与此同时，由于大量的老建筑被拆迁，产生了大量的建筑垃圾，其中废弃混凝土约占建筑垃圾总量的30%~50%。目前，，学者认为再生混凝土技术既可减少天然骨料的开采，保护生态环境，又可解决废弃混凝土的污染问题，同时带来一定的经济效益。然而，相比于普通混凝土，再生混凝土抗压强度较低，弹性模量较低，且力学性能离散性较大，不利于其应用于工程实际。将再生混凝土灌入钢管中形成钢管再生混凝土结构，钢管对再生混凝土产生一定的约束，提高再生混凝土的轴心抗压强度，同时由于再生混凝土的存在，将延缓钢管的屈曲。因此，钢管再生混凝土构件发挥了钢及再生混凝土的力学优势，是成为再生混凝土应用于工程实际的有效途径。目前，国内外学者对钢管再生混凝土框架柱的压弯滞回性能研究尚不系统，本文将对钢管再生混凝土框架柱的压弯滞回性能进行研究，具体进行以下几方面工作： （1）根据课题组关于可循环利用的结构柱压弯滞回试验刚性梁段试验装置的发明专利，通过Midas有限元软件对试验装置进行受力分析，并进行改进设计，将改进后的装置用于试验研究中。 （2）进行钢管高强再生混凝土柱在高轴压比条件下的压弯滞回性能试验研究，其中试验加载装置采用改进的仿日本建研式四连杆装置。分析不同试验条件下构件压弯滞回性能试验结果，为后续此装置进行结构压弯滞回性能试验奠定基础。 （3）建立圆钢管再生混凝土框架柱的滞回曲线的数值分析方法，编写计算程序，并与已有试验数据进行模型验证与对比，以确定计算程序的可靠性。 （4）利用模型柱法对钢管再生混凝土框架柱压弯力学性能进行参数分析，分析轴压比、再生混凝土取代率、再生混凝土强度、钢材屈服强度、钢材厚度、长细比等参数对钢管再生混凝土框架柱压弯滞回曲线与骨架曲线的影响。收集现有试验数据，通过与国内外典型规范计算所得到的钢管再生混凝土构件压弯滞回屈服承载力进行对比分析，评价不同规范在分析此类构件压弯滞回屈服承载力的适用性，为钢管再生混凝土构件的压弯滞回设计提供建议。
[Abstract]:With the acceleration of urbanization in China, the huge demand for concrete leads to the mining of a large number of sand and gravel aggregates in the process of the development of construction industry. At the same time, a large number of old buildings have been demolished, resulting in a large number of construction waste, of which waste concrete accounts for about 30% of the total construction waste 50%. At present, scholars think that recycled concrete technology can not only reduce the mining of natural aggregate, protect the ecological environment, but also solve the pollution problem of waste concrete, and bring certain economic benefits at the same time. However, compared with ordinary concrete, recycled concrete has lower compressive strength, lower elastic modulus and greater dispersion of mechanical properties, which is not conducive to its application in engineering practice. Recycled concrete is poured into steel tube to form recycled concrete structure. Steel tube restricts recycled concrete to a certain extent and improves the axial compressive strength of recycled concrete. At the same time, due to the existence of recycled concrete, the buckling of steel pipe will be delayed. Therefore, recycled concrete filled steel tube (CFST) members give full play to the mechanical advantages of steel and recycled concrete, and it is an effective way for recycled concrete to be used in engineering practice. At present, the research on the compression-bending hysteretic behavior of recycled concrete-filled steel tubular frame columns is not systematic at home and abroad. In this paper, the compression-bending hysteretic properties of recycled concrete-filled steel tubular frame columns will be studied, and the following aspects will be carried out: (1) according to the invention patent of the rigid beam section test device for recyclable structural columns, The force of the test device is analyzed by Midas finite element software, and the improved device is used in the experimental research. (2) the compression-bending hysteretic performance of high strength recycled concrete-filled steel tubular columns under high axial compression ratio is studied, in which the improved Japanese construction and research four-bar device is used in the test loading device. The test results of compression-bending hysteretic performance of members under different test conditions are analyzed, which lays a foundation for the subsequent structural compression-bending hysteretic performance test of this device. (3) the numerical analysis method of hysteretic curve of recycled concrete-filled circular steel tube frame column is established, and the calculation program is compiled, and the model is verified and compared with the existing test data in order to determine the reliability of the calculation program. (4) the compressive bending mechanical properties of recycled concrete-filled steel tubular frame columns are analyzed by model column method, and the effects of axial compression ratio, recycled concrete substitution rate, recycled concrete strength, steel yield strength, steel thickness and slenderness ratio on compressive bending hysteretic curve and skeleton curve of recycled concrete-filled steel tubular frame columns are analyzed. By collecting the existing test data and comparing with the compression-bending hysteretic yield bearing capacity of recycled concrete-filled steel tubular members calculated by typical codes at home and abroad, the applicability of different codes in analyzing the compression-bending hysteretic yield bearing capacity of this kind of members is evaluated, which provides suggestions for the compression-bending hysteretic design of recycled concrete-filled steel tubular members.
【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】：TU398.9
本文编号：2499097
[Abstract]:With the acceleration of urbanization in China, the huge demand for concrete leads to the mining of a large number of sand and gravel aggregates in the process of the development of construction industry. At the same time, a large number of old buildings have been demolished, resulting in a large number of construction waste, of which waste concrete accounts for about 30% of the total construction waste 50%. At present, scholars think that recycled concrete technology can not only reduce the mining of natural aggregate, protect the ecological environment, but also solve the pollution problem of waste concrete, and bring certain economic benefits at the same time. However, compared with ordinary concrete, recycled concrete has lower compressive strength, lower elastic modulus and greater dispersion of mechanical properties, which is not conducive to its application in engineering practice. Recycled concrete is poured into steel tube to form recycled concrete structure. Steel tube restricts recycled concrete to a certain extent and improves the axial compressive strength of recycled concrete. At the same time, due to the existence of recycled concrete, the buckling of steel pipe will be delayed. Therefore, recycled concrete filled steel tube (CFST) members give full play to the mechanical advantages of steel and recycled concrete, and it is an effective way for recycled concrete to be used in engineering practice. At present, the research on the compression-bending hysteretic behavior of recycled concrete-filled steel tubular frame columns is not systematic at home and abroad. In this paper, the compression-bending hysteretic properties of recycled concrete-filled steel tubular frame columns will be studied, and the following aspects will be carried out: (1) according to the invention patent of the rigid beam section test device for recyclable structural columns, The force of the test device is analyzed by Midas finite element software, and the improved device is used in the experimental research. (2) the compression-bending hysteretic performance of high strength recycled concrete-filled steel tubular columns under high axial compression ratio is studied, in which the improved Japanese construction and research four-bar device is used in the test loading device. The test results of compression-bending hysteretic performance of members under different test conditions are analyzed, which lays a foundation for the subsequent structural compression-bending hysteretic performance test of this device. (3) the numerical analysis method of hysteretic curve of recycled concrete-filled circular steel tube frame column is established, and the calculation program is compiled, and the model is verified and compared with the existing test data in order to determine the reliability of the calculation program. (4) the compressive bending mechanical properties of recycled concrete-filled steel tubular frame columns are analyzed by model column method, and the effects of axial compression ratio, recycled concrete substitution rate, recycled concrete strength, steel yield strength, steel thickness and slenderness ratio on compressive bending hysteretic curve and skeleton curve of recycled concrete-filled steel tubular frame columns are analyzed. By collecting the existing test data and comparing with the compression-bending hysteretic yield bearing capacity of recycled concrete-filled steel tubular members calculated by typical codes at home and abroad, the applicability of different codes in analyzing the compression-bending hysteretic yield bearing capacity of this kind of members is evaluated, which provides suggestions for the compression-bending hysteretic design of recycled concrete-filled steel tubular members.
【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】：TU398.9
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