新型高阻尼混凝土暗支撑剪力墙抗震性能与设计方法研究

发布时间：2018-04-20 01:04

本文选题：钢板暗支撑 + 高阻尼剪力墙　；参考：《湖南大学》2016年博士论文

【摘要】：高阻尼混凝土具有较好的抗冲击韧性和阻尼性能,将其用于结构中,可以吸收并耗散地震时输入结构的能量,是混凝土技术的一个发展方向。现有的耗能减振措施一般是过在结构中通附加阻尼装置来耗散地震输入结构中的能量,避免结构在强震作用下过早发生破坏,这往往给设计和施工带来诸多不便。在高阻尼混凝土研究的基础上,结合现有的高阻尼混凝土剪力墙的研究成果,提出了高阻尼混凝土带钢板暗支撑的新型剪力墙结构。为提高抗震投入的经济效益,提出在塑性区用部分高阻尼混凝土剪力墙代替全部由高阻尼混凝土浇筑的剪力墙;为了进一步提高阻尼混凝土剪力墙的延性,提出了用具有超高延性高阻尼ECC在塑性区部分浇筑的剪力墙结构。本文进行了上述相关试验研究和理论分析。主要内容和结果如下:(1)进行了2组9种不同配比下的ECC材性实验,研究了聚灰比、单一乳液和乳液共混对ECC材料的基本力学性能的影响,得到了阻尼增强效果较优的掺料百分比;完成了9种不同配比下ECC悬臂梁在不同振幅下的阻尼测试,获得了ECC悬臂梁的阻尼比与变形的变化关系。在此基础上,提出了增强阻尼ECC悬臂梁构件阻尼比的计算理论与方法两折线阻尼比理论模型。(2)完成了2片部分高阻尼混凝土带钢筋暗支撑剪力墙的抗震性能试验,获得了剪力墙在静力反复荷载作用下的破坏模式、承载力、滞回曲线以及耗能能力等抗震性能指标。试验分析表明,用部分高阻尼混凝土来替代全部由高阻尼混凝土浇筑剪力墙,其承载力和延性相差较小,且能节约工程造价,在经济上更具合理性;与部分高阻尼混凝土剪力墙试验结果相比,部分高阻尼ECC剪力墙延性和变形能力无显著差别,但其开裂荷载和峰值荷载有较大程度的提高,刚度退化较小。(3)完成了2片高阻尼混凝土带钢板暗支撑双肢剪力墙的低周反复加载试验。与已有试验结果的对比,高阻尼混凝土带钢板暗支撑双肢剪力墙的开裂荷载、极限承载力、后期刚度、变形能力、耗能能力均有一定程度的提高。在试验过程中,首先在连梁端部形成较为明显的塑性铰,其次墙肢边框柱底部混凝土被压酥而发生明显的破坏,屈服破坏机制具有明确的两道抗震防线。该新型剪力墙体系能有效提高抗震能力,具有一定的工程实用意义。将该新型剪力墙结构用于工程中,更有利于结构的抗震。(4)通过理论分析,提出了以开裂点、屈服点、峰值点和极限点为特征点并考虑刚度退化的带暗支撑剪力墙四线型荷载-位移回复力模型,并给出了各特征点参数以及各阶段刚度计算公式。采用本文提出的四折线复力模型所的计算滞回曲线与试验滞回曲线吻合较好。分别采用MSC.MARC和ABAQUS有限元软件模拟了剪力墙的受力性能,模拟结果与试验结果吻合较好。(5)剪跨比、轴压比和墙肢配筋率是影响剪力墙塑性铰长度的主要因素。在数值模拟的基础上,利用MATLAB软件拟合出了单一影响因素对塑性铰长度的影响。进而,通过多参数拟合,提出了在主要因素影响下的塑性铰长度计算模型。按剪跨比和轴压比的不同,统计得到了剪力墙在同性能阶段的性能目标,为剪力基于性能的设计提供参考和依据。完善了基于位移的变形能力的剪力墙结构体系的抗震设计方法,并给出了剪力墙配箍特征的计算方法。
[Abstract]:High damping concrete has good impact toughness and damping property. It can absorb and dissipate the energy of the input structure when it is used in the structure. It is a development direction of concrete technology. The existing energy dissipation measures are generally used to dissipate the energy in the seismic input structure through additional damping loading in the structure to avoid the junction. A new type of shear wall structure with high damping concrete steel plate with dark support is put forward on the basis of the research of high damping concrete and the research results of high damped concrete shear walls. In order to further improve the ductility of the damped concrete shear wall, a shear wall with a super ductility and high damping ECC in the plastic zone is put forward in order to further improve the ductility of the damped concrete shear wall. The contents and results are as follows: (1) 2 groups of 9 different ratios of ECC wood properties were carried out. The effect of ash ratio, single emulsion and emulsion blending on the basic mechanical properties of ECC materials was studied. The percentage of better damping effect was obtained, and the damping test of ECC cantilever beam under different amplitudes under 9 different proportions was completed. The relationship between the damping ratio and the deformation of the ECC cantilever beam is obtained. On this basis, the theory and method of the damping ratio of the reinforced damping ECC cantilever beam are proposed. (2) the test of the resistance to the shear walls of the dark braced shear walls of 2 parts of the high damping concrete with the reinforced concrete is completed, and the static load of the shear wall in the shear wall is obtained. The failure mode, bearing capacity, hysteretic curve and energy dissipation capacity under the load are measured. The experimental analysis shows that a part of high damping concrete is used to replace all high damped concrete cast shear walls. The bearing capacity and the ductility of the concrete are small, and it can save the engineering price and be more reasonable in economy. Compared with the soil shear wall test results, there is no significant difference in the ductility and deformability of some high damping ECC shear walls, but the cracking load and peak load are greatly improved, and the stiffness degradation is smaller. (3) the low cycle repeated loading tests of 2 slices of high damping concrete with dark braced double shear walls have been completed. The cracking load, the ultimate bearing capacity, the later stiffness, the deformability and the energy dissipation capacity of the high damped concrete with the steel plate with the steel plate are improved to a certain extent. In the process of the test, the more obvious plastic hinge is formed at the end of the continuous beam, and the concrete is destroyed obviously at the bottom of the wall of the wall of the wall, and the yield is broken. The bad mechanism has a clear two anti seismic line. The new shear wall system can effectively improve the anti-seismic capacity, and has a certain practical significance. The new shear wall structure is used in the engineering and is more conducive to the earthquake resistance of the structure. (4) through theoretical analysis, the characteristic points of the cracking point, the yield point, the peak point and the limit point are put forward and the stiffness of the new shear wall is considered and the stiffness is considered and the rigidity of the shear wall is considered and the rigidity of the shear wall is considered and the rigidity of the shear wall is considered and the rigidity of the shear wall is considered and the rigidity of the shear wall is considered. The four linear load displacement restoring force model with a degenerate dark braced shear wall is presented, and the parameters of each characteristic point and the stiffness calculation formula of each stage are given. The calculated hysteretic curve of the four fold reforce model proposed in this paper is in good agreement with the test hysteretic curve. The shear walls are simulated by MSC.MARC and ABAQUS finite element software respectively. The simulation results are in good agreement with the experimental results. (5) the shear span ratio, the axial compression ratio and the reinforcement ratio of the wall are the main factors affecting the plastic hinge length of the shear walls. On the basis of the numerical simulation, the impact of the single influence factor on the length of plastic hinge is fitted by the MATLAB software, and the main reasons are proposed by the multi parameter fitting. According to the difference of the shear span ratio and the axial compression ratio, the performance target of the shear wall at the same sex energy stage is obtained according to the difference of the shear span ratio and the axial compression ratio, which provides the reference and basis for the design of shear based on the performance. The seismic design method of shear wall structure system based on the displacement ability is perfected, and the stirrup of shear wall is given. The calculation method of the sign.

【学位授予单位】：湖南大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TU398.2;TU352.11

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