新型预制装配式消能减震混凝土框架节点抗震性能试验研究

发布时间：2018-10-14 16:46

【摘要】：预制装配式混凝土框架结构整体性能差、抗震效果不理想等不足，限制了该结构体系在建筑工程中的大规模运用。为了提高预制装配式混凝土框架结构的抗震性能，同时保护其相对薄弱的框架节点，减缓及避免此类框架结构弱节点‖破坏模式的形成，提出了一种在预制装配整体式混凝土框架梁柱节点中布置扇形铅粘弹性阻尼器的新型结构体系。为深入了解新型预制装配式消能减震混凝土框架结构体系的动力特性、抗震性能以及减震效果的影响规律进行了研究，主要内容如下：（1）针对国内外有关预制装配式框架结构的研究存在的不足，提出了新型预制装配后浇整体式消能减震混凝土框架结构体系，并对其节点构造形式进行了设计。（2）对布置了扇形铅粘弹性阻尼器的新型预制装配式消能减震混凝土框架结构进行数值模拟分析，，研究了整体减震效果和节点内力变化情况。经受力分析表明：扇形铅粘弹性阻尼器改善了预制装配式结构梁柱节点受力性能，提高节点承载力和刚度，增强整体结构耗能减震能力。（3）针对该新型预制装配式消能减震混凝土框架结构体系特点，设计了普通预制节点试件和新型预制节点试件，并进行了低周反复加载试验，研究了节点破坏模式、滞回曲线、延性、强度和刚度退化程度、耗能性能及钢筋应变变化情况等抗震性能的差异。研究结果表明：附加扇形铅粘弹性阻尼器的新型预制节点的滞回曲线饱满，在耗能能力、极限承载力和位移延性方面大大高于普通预制节点，节点核心区应变量相对减少，实现了强节点弱构件、强剪弱弯‖性能要求。（4）在初步验证新型节点有效性的基础上，设计制作了两组普通预制框架节点和新型预制框架节点，通过试验研究进一步对比分析了在不同轴压比作用下新型预制节点力学性能变化规律，研究结果表明：在高轴压比作用下，普通预制节点和新型预制节点的耗能能力和刚度得到一定的提高，极限承载力和刚度及强度退化程度基本相同，但其位移延性明显降低。设计了普通现浇框架节点和新型现浇框架节点，进行了试验研究，验证了附加扇形铅粘弹性阻尼器的普通现浇框架节点的抗震性能差异，研究结果表明：新型现浇框架节点的刚度、极限承载力和位移延性等均得到一定程度提高，其滞回曲线饱满平滑，耗能性能良好，但相比新型预制节点其滞回环较为狭长，阻尼器主要起了类似掖撑‖提供刚度的作用。
[Abstract]:The performance of precast prefabricated concrete frame structure is poor, the seismic effect is not ideal and so on, which limits the large-scale application of the structure system in building engineering. In order to improve the seismic performance of precast prefabricated concrete frame structure and protect its relatively weak frame joints, and to slow down and avoid the formation of the failure mode of this kind of frame structure, A new type of structural system with sector lead viscoelastic dampers in precast assembled integral concrete frame Liang Zhu joints is presented in this paper. In order to deeply understand the dynamic characteristics, seismic performance and the influence law of shock absorption effect of the new precast prefabricated energy dissipation concrete frame structure system, The main contents are as follows: (1) in view of the shortcomings of the research on prefabricated frame structures at home and abroad, a new type of precast assembly post-cast-in-situ concrete frame structure system for energy dissipation and shock absorption is proposed. The structure of the joints is designed. (2) numerical simulation analysis of a new precast prefabricated concrete frame structure with lead viscoelastic dampers is carried out. The effect of the whole damping and the change of the internal force of the joint are studied. The stress analysis shows that the fan lead viscoelastic damper can improve the mechanical performance of the prefabricated Liang Zhu joints and increase the bearing capacity and stiffness of the joints. (3) according to the characteristics of the new precast prefabricated energy dissipation concrete frame structure, the common prefabricated joint specimen and the new prefabricated joint specimen are designed. Low cycle repeated loading tests were carried out to study the seismic behavior of joints such as failure mode hysteretic curve ductility strength and stiffness degradation energy dissipation performance and strain change of steel bar. The results show that the hysteretic curves of the new prefabricated joints with sector lead viscoelastic dampers are full, and the hysteretic curves of the prefabricated joints are much higher than those of the conventional prefabricated joints in terms of energy dissipation capacity, ultimate bearing capacity and displacement ductility. The performance requirements of strong joints and weak members are achieved. (4) on the basis of preliminary verification of the effectiveness of the new type of joints, two groups of common prefabricated frame joints and new prefabricated frame joints are designed and manufactured. The mechanical properties of the new prefabricated joints under different axial compression ratios are further compared and analyzed through the experimental study. The results show that: under the high axial compression ratio, The energy dissipation capacity and stiffness of common prefabricated joints and new prefabricated joints are improved to a certain extent, and the ultimate bearing capacity, stiffness and strength degradation degree are basically the same, but their displacement ductility is obviously reduced. The common cast-in-place frame joints and the new cast-in-place frame joints are designed. The experimental results show that the seismic behavior of the common cast-in-place frame joints with sector lead viscoelastic dampers is different. The results show that the stiffness, ultimate bearing capacity and displacement ductility of the new cast-in-place frame joints are improved to a certain extent, the hysteretic curves are full and smooth, the energy dissipation performance is good, but the hysteretic loop is longer and narrower than the new prefabricated joints. Dampers mainly play a similar role in providing stiffness.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU37;TU352.1

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