体外预应力粗料石砌体墙抗震性能试验研究

发布时间：2018-06-06 07:59

本文选题：粗料石砌体墙 + 体外预应力　；参考：《建筑结构学报》2017年12期

【摘要】：通过7片体外预应力粗料石砌体墙的水平低周反复荷载试验,研究了体外预应力水平、预应力筋布置形式、窗洞口等不同参数对体外预应力粗料石砌体墙的受力过程、破坏形态、受剪承载力、滞回曲线、骨架曲线、变形能力、耗能能力以及刚度退化等的影响。研究结果表明:体外预应力粗料石砌体墙的受力与破坏过程可近似划分为弹性工作阶段、弹塑性工作阶段和摩擦耗能阶段;体外预应力不仅大大提高了墙体的开裂荷载和峰值荷载,同时显著改善墙体的变形能力、延性和耗能能力;墙体开裂荷载和峰值荷载随着预应力水平的提高而增大;墙体滞回性能和耗能能力都随着预应力水平的提高先逐渐增强后逐渐降低,当体外预应力作用为0.3 MPa时达到最大;相比在墙体两端和中间同时布置体外预应力筋,预应力筋全部布置在墙体两端可以提高墙体的开裂荷载,但会降低墙体的峰值荷载,以及其滞回性能、能量耗散系数、刚度退化等抗震性能;开设窗洞口对墙体整体性能和抗震性能削弱明显,在实际结构中应尽量避免开过大的门窗洞口。根据试验及理论分析,提出了体外预应力粗料石砌体墙的受剪承载力计算式。
[Abstract]:Based on the horizontal low cycle cyclic loading tests of 7 externally prestressed coarse stone masonry walls, the stress process of external prestressed concrete masonry walls with different parameters, such as the external prestressing level, the layout of prestressed tendons and the window opening, is studied. Failure patterns, shear capacity, hysteretic curves, skeleton curves, deformability, energy dissipation and stiffness degradation. The results show that the stress and failure process of externally prestressed stone masonry wall can be roughly divided into three stages: elastic working stage, elastic-plastic working stage and friction energy dissipation stage. The external prestressing not only greatly increases the cracking load and peak load of the wall, but also improves the deformation ability, ductility and energy dissipation capacity of the wall, and the cracking load and peak load increase with the increase of the prestress level. The hysteretic performance and energy dissipation capacity of the wall gradually increase and then decrease with the increase of the prestress level, and reach the maximum when the external prestressing force is 0.3 MPa, compared with the external prestressing tendons arranged at both the two ends and the middle of the wall at the same time. All the prestressed tendons arranged at both ends of the wall can increase the cracking load of the wall, but will reduce the peak load of the wall, as well as its hysteretic performance, energy dissipation coefficient, stiffness degradation and other seismic performance. The opening of window openings weakens the overall performance and seismic performance of the wall obviously, and should be avoided as far as possible in the actual structure. Based on the experimental and theoretical analysis, a formula for calculating the shear capacity of externally prestressed stone masonry walls is presented.
【作者单位】：成都世茂新城房地产开发有限公司;东南大学混凝土及预应力混凝土结构教育部重点实验室;
【基金】：“十二五”国家科技支撑计划(2011BAJ08B04)
【分类号】：TU352.11;TU364

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