蒸压粉煤灰砖墙上植筋的拉拔试验及数值分析

Pullout experiments and numerical simulation of post-installed reinforcement anchorage in autoclaved fly ash brick wall

在3个蒸压粉煤灰砖试件上对56根不同直径、锚固深度为10 d的化学植筋后锚固钢筋进行单向拉拔试验.通过测量在不同荷载等级下的钢筋滑移、钢筋应变分布并观察试件受力破坏过程,归纳化学植筋后锚固的受拉破坏模式,研究分析不同钢筋外形、不同直径对化学植筋后锚固承载力的影响.根据蒸压粉煤灰砖砌体、钢筋和胶粘剂的特点及其粘结滑移关系,建立植筋锚固的有限元分析模型,并进行有限元计算.对计算结果与试验结果进行比较,计算结果与试验结果吻合较好.

The pullout tests are done on 56 rebars with different diameters which are post-installed chemically and 10d-depth anchored to 3 autoclaved fly ash brick specimens. By monitoring the process and measuring the displacements and strains of steel bars, the behavior of chemically bonded rebar in autoclaved fly ash brick specimens is analyzed. Some important problems such as the destructive process, the destruction model, the influences of different steel grades of steel and diameters on the bearing capacity are analyzed. Based on the features of autoclaved fly ash bricks, reinforcement, adhesives, and bond-slide relationships between them, a finite element model for analyzing post-installed reinforcement anchorage in bricks is established. Comparing the calculation results of the model with the experimental results, it is show that the calculation results coincide well with the experimental results.