新型装配式混凝土墙抗震性能试验及正截止面受弯承载力研究

发布时间：2018-01-06 23:37

本文关键词：新型装配式混凝土墙抗震性能试验及正截止面受弯承载力研究　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国“建筑工业化、住宅产业化”进程加快,一批适合我国国情和地域特点的新型装配整体式混凝土结构体系应运而生,其具有施工快捷、连接可靠、耗能减震、生态节能等优势。本文通过6榀新型装配式混凝土墙抗震性能试验,分别研究不同布筋形式、竖向连接方式、水平连接方式等关键参数对墙体破坏形态及抗震性能的影响规律;在试验研究的基础上,建立基于关键参数变化墙体非线性数值扩展分析模型,对比分析关键参数变化对墙体主要抗震性能指标的影响规律;以平截面假定为基础,通过平截面假定的验证和计算模型的简化,探讨性提出墙体正截面计算分析模型与承载力计算公式。本文主要研究内容与成果包括:1、通过6榀1/2比例墙体在竖向及水平荷载共同作用下的拟静力试验,分别研究不同布筋方式(均布、田字型、井字型)、竖向连接方式(焊接、座浆)、水平连接方式(马牙槎、T型槽、粗糙面)等关键参数对墙体破坏特征及抗震性能的影响规律。试验研究及分析结果表明:1)仅SW6表现为弯曲破坏,其余5榀墙体均发生弯剪破坏;2)井字型配筋墙体较其他类型配筋墙体,裂缝分布更均匀,滞回曲线更饱满,承载力、刚度略高,延性较好;3)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体;4)现浇竖向边缘构件与预制墙板的水平连接整体性良好,马牙槎墙体的水平连接性能优于其他方式的水平连接。2、在试验研究的基础上,建立墙体非线性数值模型,将数值模拟结果与试验结果进行对比分析,验证数值模型的准确性;开展基于关键参数变化的数值扩展分析,对比分析竖向约束构件配筋率(4榀)、轴压比(4榀)、高宽比(4榀)、焊板位置及数量(3榀)对新型装配式混凝土墙体抗震性能的影响规律。数值分析结果表明:1)随着竖向边缘构件配筋率的增大,墙体受弯承载力略有提高,延性有所提高;2)随着轴压比的增大,墙体承载力逐渐提高,延性系数降低;3)随着高宽比的增大,墙体受弯承载力均显著降低,但延性有所提高;4)焊板位置由墙板居中处变为墙板端部,墙体受弯承载力和延性均有所提高,但焊板超过一定数量时,承载力及延性略有降低。3、在试验及数值扩展分析的基础上,以墙体底面为正截面受弯控制截面,进行平截面假定的验证;基于平截面假定,建立更为有效的墙体计算简化模型,把墙体各阶段应力及内力计算贯通起来,根据平衡方程建立起正截面计算体系,探讨性提出墙体正截面压弯、拉弯承载力实用计算公式,并建议性的提出装配式结构与现浇结构正截面受弯承载力之间的折减系数。理论计算与试验结果表明:通过压弯承载力计算值与实测值的对比分析,证明新型装配式混凝土墙受弯承载力计算公式的合理准确性,为新型装配式混凝土结构体系实际工程设计提供一定参考。
[Abstract]:As China's industrial building, residential industrialization process accelerated, emerged a number of suitable for China's national conditions and regional characteristics of the new prefabricated concrete structure system, which has convenient construction, reliable connection, energy dissipation, energy conservation and other advantages. Through the test of 6 pieces of the new assembly of seismic performance of concrete wall, respectively different reinforcement forms, vertical connection, connection level key parameters such as the influence of the failure mode and seismic performance; on the basis of experimental research, an extended numerical analysis model of key parameters based on the nonlinear variation of the wall body, comparative analysis of influence of key parameters on the seismic performance of the main indexes of the wall on the plane section; the simplified assumption, verified by the plane section assumption and calculation model, the paper presents the calculation and analysis of wall cross-section model and bearing capacity. Formula. The main research contents and results are as follows: 1, through the test of 6 1/2 ratio of wall in the vertical and horizontal loads of the pseudo static test, studies of different reinforcement methods (uniform, Tian font, wells font), vertical connection (welding, seat, water slurry) flat connection (horse tooth trough, T groove, rough surface) of the key parameters of wall failure characteristics and seismic performance. The experimental research and analysis of the results showed that: 1) only SW6 bending failure, the remaining 5 pieces of wall were bending shear failure; 2) well type reinforcement wall than other types of reinforcement wall crack, distribution, hysteretic curve Fuller, bearing capacity, stiffness and ductility is slightly higher, better; 3) embedded welding plate not only can effectively transfer the reinforced vertical stress, shear performance is better than base slurry and pre welding plate welding of wall connecting wall; 4) cast member and the vertical edge prefabricated wall panel The level of connection of good integrity, connect the.2 connection is better than the other way of horse tooth trough wall level, on the basis of experimental research, the establishment of the wall nonlinear numerical model, the numerical simulation results are compared with experimental results, accurately verify the numerical model; numerical analysis are carried out based on the change of key parameters of the expansion, comparison analysis of vertical constraint reinforcement ratio (4 specimens), axial compression ratio (4), the ratio of height to width (4 pieces), welding position and quantity (3 pieces) influence on the seismic performance of precast concrete wall. The numerical results show that: 1) with the increase of reinforcement ratio of vertical edge component the slight increase of flexural bearing capacity of the wall, the ductility is improved; 2) with the increase of axial compression ratio, gradually improve the bearing capacity of the wall, the ductility coefficient decreased; 3) with the increase of the ratio of height to width, wall bending bearing capacity decreased significantly, but the ductility increased; 4) welding plate position from the middle wall to wall end, capacity and ductility were improved the flexural bearing wall plate welding, but more than a certain amount, the bearing capacity and ductility decreased slightly in.3, expansion test and numerical analysis on the basis of the bottom wall is normal section bending control section. To verify the assumption of plane section; based on the plane section assumption, establish a more effective wall simplified calculation model and the various stages of the wall stress and internal force calculation through up according to the balance equation, calculating system of normal section, the paper presents the calculation formula of normal section bending wall, bending bearing capacity and practical, constructive this is section assembling type structure and the cast-in-place structure bending capacity between the reduction coefficient. Theoretical calculation and experimental results show that the bending bearing capacity calculated values and the measured values, which proves that the new precast concrete wall in bending The reasonable accuracy of the calculation formula of bearing capacity provides a certain reference for the practical engineering design of the new type of assembled concrete structure system.

【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】：TU375;TU352.11

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