提出了一种新型自复位免修复摩擦耗能支撑，自复位和耗能能力分别由预应力钢绞线和摩擦阻尼器提供。设计并制作了缩尺比例为0.6的试验构件，对其进行了两种摩擦工况下的低周往复加载试验，研究其变形能力、滞回特性、耗能能力、塑性发展、索力变化以及自复位能力。同时利用ABAQUS软件对试验过程进行了数值模拟，并与试验结果进行了对比分析。研究结果表明，新型自复位免修复耗能支撑安装方便快捷，有着良好的耗能能力和自复位能力，加载过程中各构件均保持弹性状态，加载后期残余变形很小，支撑仍然保持较大的刚度，摩擦阻尼器中黄铜板的设置有效避免了摩擦面老化问题并提供了稳定的耗能能力，加载结束后支撑预应力钢绞线的索力降低很小，支撑仍然可以继续正常工作，实现了“自复位免修复”的设计目标，降低了建筑的修复成本。
Abstract
A new kind of self-centering and free-repair brace with friction damper is put forward in the paper, which the self-centering and the energy dissipating capacity are provided by the prestressed steel strand and the friction dampers respectively.In this thesis, the specimensare scaledto 0.6, as well as low cyclic loading tests with two designed friction conditions have been conducted to investigate the deformation performance, hysteretic characteristics, energy-dissipatedcapacity,plastic development,post-tensioned forcevariation and self-centering capacity. Simultaneously, numerical simulation towards the testing process has been carried out by adopting software ABAQUS, which results have been compared with that from the test. The researching results indicate that the new-typebrace can be installed feasibly and fleetly, as well as possessing favorable energy dissipating and self-centering capacity. All parts of the brace can maintain elastic during the loading process, the residual deformation is very small in later period of the loading process, stiffness of the brace remains relatively large. The installation of the brass sheets in friction dampers can avoid the maturing condition of friction interfaces as well asproviding stable energy friction capacity. Reduction of the cable forces in braces is very small after the loading process. Therefore, the braces can continue to work, achieving the design target of “self-centering and free-repair”, as well as reducing the repairing cost of the architecture.
关键词
自复位 /
免修复 /
支撑 /
预应力钢绞线 /
摩擦阻尼器
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Key words
self-centering;free-repair;brace /
prestressed strands /
friction damper
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