新型装配式混凝土墙体抗震性能试验及计算模型研究

发布时间：2018-04-01 05:02

本文选题：新型装配式混凝土墙　切入点：抗震性能试验　出处：《西安建筑科技大学》2015年硕士论文

【摘要】：装配式混凝土结构具有工业化程度高、施工进度快、经济效益及综合效益高等优点,符合国家“低碳经济”和“四节一环保”要求,避免了传统建筑施工的缺点。课题组在前期研究成果的基础上将原有生态复合墙结构构造原理与装配式剪力墙结构有机结合,相互取长补短、各汲优点,提出新型装配式混凝土墙结构体系。本文在新型装配式混凝土墙体构件层面上,考虑了不同布筋方式(均布、田字型、井字型)、竖向连接方式(焊接连接和座浆连接)、水平连接方式(马牙槎、T型槽和粗糙面),共设计了6榀1/2比例墙体(SW1~SW6)构件,进行拟静力试验研究。提出基于不同关键参数变化的新型装配式混凝土墙体抗侧刚度修正公式,并建立考虑刚度退化的四折线恢复力模型及改进的多竖杆墙体数值模型,为提出新型装配式混凝土墙结构设计方法奠定理论基础。本文的主要工作如下:(1)通过新型装配式混凝土墙体的拟静力试验,分别研究了不同布筋方式(均布、田字型、井字型)、竖向连接方式(焊接连接和座浆连接)、水平连接方式(马牙槎、T型槽和粗糙面)等关键参数对墙体抗震性能的影响规律。结果表明:墙板侧面混凝土连接方式为马牙槎时,现浇竖向边缘构件与墙板咬合性能较好,遂在墙体受力过程中墙板与竖向边缘构件的协同工作性能良好,破坏时连接处仅出现细微裂缝;墙体与底梁的竖向连接方式为预埋焊板焊接时,受力过程中墙体与底梁的协同工作性能较好,预埋焊板不仅能有效传递钢筋竖向应力,同时使预埋焊板焊接墙体的抗剪切性能优于座浆连接墙;6榀墙体的刚度退化规律基本相同,衰减曲线总体趋势是加载初期的刚度退化不稳定,随着位移的增加,塑性变形的不断发展,刚度衰减速度变慢,最后趋于平缓。各墙体刚度衰减比较均匀,没有明显的刚度突变。预埋焊板焊接能有效提高墙体的整体抗侧刚度。(2)在上述试验基础上,对比分析不同布筋方式、竖向连接方式和水平连接方式等关键因素对新型装配式混凝土墙抗侧刚度的影响;基于ABAQUS非线性数值模型,考虑混凝土、钢筋及座浆层的多种材料本构组合,建立接触单元(Contact element)来模拟水平方向预制混凝土墙板与现浇边缘约束构件间的水平边界连接,竖直方向设置的焊板与砂浆层均与墙板底部边界按固结处理,通过数值扩展分析,讨论边缘约束构件配筋率、轴压比、墙体高宽比以及焊板位置和数量对新型装配式混凝土墙抗侧刚度的影响规律;最后对关键参数进行回归分析,推导出新型装配式混凝土墙抗侧刚度的修正公式。试验研究及计算结果表明:该抗侧刚度修正公式与试验结果吻合度较高,可以满足实际工程计算需要。(3)通过对试验数据的分析计算,得出新型装配式混凝土墙体的解析式骨架曲线,确定墙体在屈服点、峰值荷载点的标准滞回环,墙体开裂后各阶段的刚度退化规律,以及恢复力路径,建立新型装配式混凝土墙体的恢复力模型;结合新型装配式混凝土墙体的具体特点,对剪力墙多竖杆数值模型加以改进,确定模型中轴向弹簧的轴向刚度、剪切弹簧的剪切刚度,建立新型装配式混凝土墙体的多竖杆数值模型,计算得各墙体骨架曲线,并与试验及退化四线型恢复力模型理论骨架曲线进行对比分析。试验研究及计算结果表明:退化四线型恢复力模型与改进的多竖杆墙体数值模型在描述新型装配式混凝土墙体抗震行为时具有较高的精度,可以满足实际工程的计算需求。
[Abstract]:Precast concrete structure with a high degree of industrialization, fast construction speed, high economic benefits and comprehensive benefits, in line with the national "low carbon economy" and "four savings and environmental protection requirements, to avoid the traditional construction project group shortcomings. Based on the results of preliminary studies of the original ecological composite wall structure principle and assembly type shear wall structure organically, learn from each other, the advantages of the new assembly drawing, put forward the concrete wall structure. Based on the model of precast concrete wall member level, taking into account the different reinforcement methods (uniform, Tian font, wells font), vertical connection (welding connection and slurryis connection), the level of connection (horse tooth trough, T groove and rough surface), there are 6 pieces of the 1/2 proportion of the wall (SW1~SW6) component, pseudo static experiment. The proposed coagulation new assembly changes of different key parameters based on The soil wall lateral stiffness formula, and establish the vertical rod wall numerical model considering stiffness degradation of four line restoring force model and improved, which lays the theoretical foundation for the proposed new design method of precast concrete wall structure. The main work of this paper are as follows: (1) through the pseudo static test model of precast concrete wall and different reinforcement methods were studied (uniform, Tian font, wells font), vertical connection (welding connection and slurryis connection), horizontal connection (horse tooth trough, T groove and rough surface) of key parameters of the seismic performance of the wall. The results show that the concrete side wall the connection for the horse tooth trough, cast member and occlusal vertical edge wall is better, then the cooperative work performance in the wall stress and vertical wall edge members in the process of failure when the connection is good, only a tiny crack in the wall and the bottom beam; The vertical connection for the pre welding plate welding, cooperative working performance of wall stress in the process and the bottom beam is good, the embedded welding plate not only can effectively transfer the reinforced vertical stress, shear performance is better than base slurry and embedded welding plate welding connection wall wall; 6 pieces of wall stiffness degradation the law is basically the same, the attenuation curve is overall trend at the initial loading stiffness degradation is not stable, with the increase in displacement, development of plastic deformation, Stiffness Decay slower, and finally tends to be gentle. The wall stiffness attenuation is relatively uniform, no obvious stiffness mutation. Embedded welding plate welding can effectively improve the the lateral stiffness of the whole wall. (2) on the basis of the above test, the comparative analysis of different reinforcement methods, the key factors affecting the vertical connection and the level of connection for new precast concrete wall lateral stiffness; nonlinear numerical model based on ABAQUS Type, considering the concrete constitutive combination of various materials and reinforced a pulp layer, a contact unit (Contact element) to simulate the horizontal direction of precast concrete panels with cast-in-situ boundary elements between the horizontal boundary connection, welded plate set in longitudinal direction and the mortar layer and the wall at the bottom of the plate boundary according to the consolidation process by numerical extension analysis, discussion of boundary element reinforcement ratio, axial compression ratio, and the influence of height width ratio of wall plate welding position and the number of new precast concrete wall lateral stiffness; finally, the key parameters of the regression analysis, the correction formula is derived in precast concrete wall lateral stiffness test. And the results show that the lateral stiffness formula fits well with experimental result, can satisfy the needs of engineering calculation. (3) through the analysis of the test data calculation results show that the new assembly type concrete wall The analytic formula of the skeleton curve, determine the wall at the yield point, peak load hysteresis loops, each stage of wall cracks after the stiffness degradation and recovery path, the restoring force model of the establishment of new precast concrete wall; combined with the specific characteristics of the new precast concrete wall body, the vertical shear walls bar numerical model is improved, determine the model of axial spring axial stiffness, shear spring stiffness, multi vertical rod to establish a numerical model of assembled concrete wall, the calculation of each wall skeleton curve, and test and degradation of four linear restoring force model theory skeleton curves were analyzed. Experimental study and calculation the results show that the vertical wall degradation numerical model of four linear restoring force model and improved with higher accuracy in describing the seismic behavior of a new type concrete wall assembly, to meet the real The computing demand of the intercourse engineering.

【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU37;TU352.11

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