带纤维混凝土耗能器底层柔性结构的抗震研究

Seismic Research on Soft-first Story Structure with Fiber Concrete Damper

底层柔性结构竖向刚度突变明显,震害往往较其他结构形式严重。现有的国内外研究提出的方法大多数都会影响其使用功能的发挥。本文将粗合成纤维混凝土耗能器应用于底层柔性结构中,用以改善其抗震性能,并对模型结构进行地震动模拟振动台试验。试验结果表明,粗合成纤维混凝土耗能器能够较好地控制结构的层间变形,从而在保证发挥底层柔性结构使用功能优势的前提下,提高其抗震性能。基于试验结果,对耗能器的工作原理及工作性能进行了进一步分析。分析表明:耗能器能够先于结构主体构件进入塑性,从而保护了结构主体构件的安全。

Soft-first story structure always has dramatic stiffness change, so the seismic performance of it is not as well as other structure form. Existing researches, both at home and abroad, give some methods to reduce the earthquake damage. However, almost all of them will affect the usage of soft-first story. In this paper, a kind of fiber concrete damper is put forward to ameliorate its earthquake damage. The shaking table test of a 1/5-scale seven-story structure specimen has being carried out. The results of the test show that fiber concrete damper can preferably control the deformation between layers. So the damper can improve the seismic performance of soft-first story structure and can not affect the usage of it. Based on the test results, the working principle of the damper is analyzed. The results show that the damper can become inelastic before the main member to protect the whole structure.