新型高强混凝土组合柱抗震性能及设计方法研究

发布时间：2018-05-06 11:14

本文选题：高强混凝土 + 型钢混凝土　；参考：《西安建筑科技大学》2014年博士论文

【摘要】：内配管材约束高强混凝土柱、配矩形螺旋箍筋型钢高强混凝土柱（以下统称为“新型高强混凝土组合柱”）是指在高强混凝土柱中采用普通箍筋与PVC管（钢管）组合、矩形螺旋箍筋与型钢组合得到的新型组合构件。该构件能增强核心混凝土的约束作用，改善高强混凝土脆性，提高变形能力以满足延性需求，具有良好的发展前景。本文通过试验研究、理论分析和数值模拟的方法对新型高强混凝土组合柱抗震性能及设计方法进行系统研究。依托地方材料，采用合理水胶比、掺加矿物外加剂及高效减水剂等工艺，研制出具有良好工作性能的高强混凝土。根据现行混凝土试验方法标准，对高强混凝土基本力学性能及本构关系模型进行系统的试验及理论研究。设计了12根配矩形螺旋箍筋型钢高强混凝土柱、3根内配PVC管约束高强混凝土短柱、1根内配钢管约束高强混凝土短柱和1根普通箍筋约束高强混凝土短柱进行低周反复荷载试验，研究了新型高强混凝土组合柱的破坏过程、破坏形态、变形能力、耗能能力和滞回性能，分析了剪跨比、轴压比、混凝土强度、体积配箍率、配箍形式、PVC管径高比等参数对柱承载力、刚度、延性、耗能能力等性能的影响。研究表明，与普通箍筋约束高强混凝土柱相比，采用内置PVC管、钢管和型钢得到的新型高强混凝土组合柱具有更优越的抗震性能。通过试验结果分析，研究了各设计参数对新型高强混凝土组合柱极限受剪承载力的影响规律。根据试验实测纵筋、箍筋、PVC管、钢管以及型钢的应变情况，分析了新型高强混凝土组合柱发生不同破坏形态时的受力机理，建立受力简化模型，推导出内配PVC管约束高强混凝土短柱、内配钢管约束高强混凝土短柱、配矩形螺旋箍筋型钢高强混凝土柱的极限受剪承载力计算公式，计算结果与试验结果吻合较好，表明提出的受剪承载力计算方法可靠。基于大小偏压界限破坏理论，首先推导出普通配筋的钢筋高强混凝土柱的轴压比限值计算方法，考虑箍筋约束、周边纵筋、密集纵筋芯柱作用的影响，推导出与其相对应的轴压比限值计算公式，这也可适用于其它增强措施的高强混凝土柱设计。然后给出内配钢管约束高强混凝土柱和配矩形螺旋箍筋型钢高强混凝土柱发生弯曲破坏时的轴压比限值计算方法，并利用试验轴压比进行检验，结果表明计算轴压比限值与实际情况吻合较好。对于剪跨比较小的配矩形螺旋箍筋型钢高强混凝土柱，在考虑含钢率、体积配箍率等因素对构件延性有利影响的基础上，，给出发生剪切斜压破坏时的轴压比限值。采用有限元软件ABAQUS对单调水平荷载作用下的新型高强混凝土组合柱受力性能进行模拟，有限元结果与试验结果符合较好。在此基础上，进行剪跨比、轴压比、钢材屈服强度及含钢率、管材径高比、混凝土强度等因素为目标参数的新型高强混凝土组合柱模拟分析，得到了各参数对新型高强混凝土组合柱受力性能的影响规律。参照国内外相关规范，将钢筋高强混凝土框架、内配钢管约束高强混凝土框架和型钢高强混凝土框架的结构性能水平划分为正常使用、暂时使用、修复后使用、生命安全和防止倒塌五档。基于国内外试验数据的分析，提出了钢筋高强混凝土柱、内配钢管约束高强混凝土柱、型钢高强混凝土柱及其框架对应五档性能水平的层间位移角限值。
[Abstract]:The inner reinforced concrete column is constrained by high strength concrete column, and the rectangular spiral stirrup steel high strength concrete column (hereinafter referred to as "new high strength concrete composite column") refers to the combination of common stirrup and PVC tube (steel pipe) in high strength concrete columns, a new combination of rectangular spiral stirrup and steel type steel. This component can enhance core coagulation. The restraining effect of soil, improving the brittleness of high strength concrete, improving the deformability to meet the ductility demand, has a good prospect. In this paper, the seismic performance and design method of the new high strength concrete composite column are studied through experimental research, theoretical analysis and numerical simulation.
The high strength concrete with good working performance is developed based on local materials, using reasonable water gel ratio, adding mineral admixtures and high efficiency water reducing agent. According to the current standard of concrete test method, the basic mechanical properties and constitutive relation model of high strength concrete are systematically tested and theoretically studied.
12 high strength concrete columns with rectangular spiral stirrups are designed, 3 with PVC tube confined high strength concrete short columns, 1 high strength concrete short columns confined with steel tubes and 1 common stirrup confined high strength concrete short columns. The failure process of the new high strength coagulant composite column is studied, and the form and deformation of the new high strength concrete composite column are studied. Capacity, energy dissipation capacity and hysteresis performance, the influence of the shear span ratio, axial pressure ratio, concrete strength, volume hoop ratio, stirrup form, PVC pipe height ratio and other parameters on the bearing capacity, stiffness, ductility and energy dissipation capacity of the column are analyzed. The study shows that the new PVC tube, steel tube and steel type steel are adopted in comparison with the high strength concrete columns confined by common stirrup. The high-strength concrete composite column has better seismic performance.
Through the analysis of the test results, the influence of various design parameters on the ultimate shear capacity of the new high strength concrete composite column is studied. According to the strain of test measured longitudinal reinforcement, stirrup, PVC pipe, steel tube and steel type steel, the stress mechanism of the new high strength concrete composite column with different damage forms is analyzed, and the simplified model of stress is established. The calculation formula of ultimate shear bearing capacity of high strength concrete columns confined with PVC tube, internal steel pipe with high strength concrete short column and rectangular spiral stirrup steel high strength concrete column is derived. The calculation results are in good agreement with the experimental results, which shows that the proposed method of shear bearing capacity is reliable.
Based on the theory of size bias limit failure, the calculation method of axial compression ratio of reinforced high strength reinforced concrete columns with common reinforcement is derived. Considering the influence of the confinement of stirrup, the surrounding longitudinal reinforcement and the intensive longitudinal reinforcement core column, the calculation formula of the limit value of axial compression ratio is deduced, which can also be applied to the high strength concrete of other reinforcement measures. The calculation method for the axial compression ratio of the high strength concrete column with the internal steel pipe and the rectangular spiral stirrup steel high strength concrete column is given, and the test results show that the limit value of axial compression ratio is in good agreement with the actual situation. On the basis of the favorable influence of steel ratio and the volume ratio of Stirrup on the ductility of the member, the axial compression ratio of the reinforced steel reinforced concrete column is given.
The finite element software ABAQUS is used to simulate the mechanical performance of a new high strength concrete composite column under the monotone horizontal load. The finite element results are in good agreement with the test results. On this basis, the shear span ratio, axial compression ratio, steel yield strength and steel ratio, the ratio of pipe diameter to height, concrete strength are the new height of the target parameters. The influence of various parameters on the mechanical behavior of the new high strength concrete composite column is obtained through the simulation analysis of the strong concrete composite column.
According to the relevant standards at home and abroad, the structural performance level of the reinforced high strength concrete frame, the steel tube confined high strength concrete frame and the steel high strength concrete frame is divided into normal use, temporary use, the use after repair, life safety and the prevention of collapse. Based on the analysis of domestic and foreign experimental data, the reinforced high strength coagulation is put forward. In the soil column, the steel tube confined high strength concrete column, the steel reinforced high strength concrete column and its frame correspond to the five layer performance level of the interlayer displacement angle limit.

【学位授予单位】：西安建筑科技大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU398.9;TU352.11

【参考文献】