Fr4环氧树脂板材隔震支座的力学性能试验研究

研究了一种使用Fr4环氧树脂板材代替普通叠层橡胶隔震支座钢板的Fr4橡胶隔震支座,这种支座使用Fr4环氧树脂板材(以玻璃纤维为增强材料,环氧树脂为基体的复合材料)作为橡胶隔震支座的加劲层材料,使之具有造价低廉、质量低、隔震性能好等适用于村镇建筑的特点。对Fr4环氧树脂板材进行了拉伸及弯曲力学性能试验,试验结果表明:Fr4环氧树脂板材可取代传统叠层橡胶隔震支座中的钢板作为橡胶隔震支座的加劲层材料。并且对Fr4橡胶支座进行了水平刚度试验、竖向刚度试验及探索了不同竖向荷载及剪应变下支座的等效阻尼比,研究表明:Fr4支座性能稳定,滞回曲线饱满,耗能能力明显,且支座的竖向刚度远大于水平刚度,是一种理想的隔震支座。

一种低造价叠层橡胶隔震支座的试验及模拟研究

提出了一种适用于村镇民居的新型低造价隔震支座,即采用低成本的3240环氧树脂板材作为叠层橡胶隔震支座的加劲层。分别对3240板材和隔震支座进行了力学性能试验,分析了竖向刚度与竖向面压的关系、水平刚度随不同竖向面压或剪应变的变化规律以及支座的力学和变形性能;对隔震支座进行压缩和剪压数值模拟,探究支座的应力分布规律以及翘曲现象对支座性能的影响。研究结果表明:3240隔震支座具有良好的力学和变形性能,支座的竖向刚度随竖向面压增大而减小,水平刚度随剪应变增大而减小;竖向压缩模拟时,支座最大竖向应力和最大水平应力均为竖向面压2倍左右;翘曲会使支座产生较大水平应力且降低支座水平刚度,工程中建议采用螺栓连接避免支座翘曲破环。

Failure Analysis in Graphite Epoxy Composite Laminates

The present analysis was performed to obtain bearing strength for pinned joints in uni-directional graphite epoxy composite laminates using characteristic curve model. The characteristic dimensions used to determine the characteristic curve were evaluated using a two-dimensional finite element model that was developed in ANSYS14.5 Software. Also, two-dimensional finite element stress analysis was developed to determine the stress distribution needed to evaluate the failure. Tsai-Wu failure criterion was used in the analysis with the characteristic curve to predict bearing strength. The results of the analysis showed good agreement with experimental data.