[书]PERFORM-3D原理与实例 – 第 18 章 – 缩尺桥墩振动台试验模拟 ( Chapter 18: Simulation of a Reduced Scaled Bridge Column Shake Table Test)

试件选自欧洲地震工程培训与研究中心(European Centre for Training and Research in Earthquake Engineering)进行的桥墩振动台试验[1],为一1/4缩尺的圆形空心截面RC桥墩试件,试件的现场布置如图 18‑1所示,试件的尺寸及配筋如图 18‑2所示。试件顶支撑一个大的质量块(1.86m×1.86m×0.88m,7.8t),大质量块用于桥墩惯性力及指定目标轴压力的施加,试件基座通过后张拉螺栓锚固于振动台,防止基座的倾覆与滑动,试件为螺旋配箍,加密区(距离基座顶面500mm范围)箍筋间距为30mm,其余区域箍筋间距60mm。

[论文][Paper]Deformation Limits of L-Section RC Shear Walls (L形RC剪力墙的变形指标)

In order to establish the relation between damage state and member deformation of the L-section RC shear wall, 216 FE models designed to meet the requirements of the Chinese codes were set up. The analysis fully considers the variation of parameters including axial load ratio and shear span ratio etc. According to the results, criteria of classifying failure modes of L-section RC shear walls are proposed. Failure modes are determined by shear-span ratio, moment-shear ratio and end columns’ reinforcement ratio. Deformation limits corresponding to respective performance levels are put forward. Fitted formulas of calculating the limits are also presented. It is shown that the categorization criteria are reliably accurate in predicting failure modes. Deformation limits of a given L-section RC shear wall could be determined via axial load ratio and moment-shear ratio. The fitted formulas possess a satisfactory correlation with numerical results.

[论文][Paper]不同抗震等级RC梁抗震性能试验研究

通过9根钢筋混凝土梁的低周往复试验,对比研究不同抗震等级RC梁的破坏形态、延性、滞回性能、耗能能力及刚度退化等。结果表明:剪跨比为2.0的试件发生弯曲滑移破坏,剪跨比为3.0的试件和剪跨比为4.2的试件发生弯曲破坏;剪跨比为2.0的试件抗震等级分别为二级和四级,表明满足规范抗震等级要求的RC梁试件无法避免发生弯曲滑移破坏;同组试件中,抗震等级越高(配箍率越大),试件的极限位移角越大。除去发生弯曲滑移破坏的试件,试件的极限位移角随抗震等级的提高呈线性增长趋势;抗震等级相同时,弯曲滑移破坏的试件刚度退化比弯曲和弯剪破坏试件严重;弯曲滑移破坏与弯曲破坏的RC梁试件其耗能分别集中在塑性阶段的前期和中后期。