爆炸荷载下钢筋混凝土T梁的应变与损伤分析

为了探究在爆炸荷载作用下，钢筋混凝土T梁桥的损伤状况及动态响应规律，制作了钢筋混凝土T梁桥，预先埋入5个压电智能骨料用以监测桥梁模型的损伤状态，在翼板和腹板粘贴6组应变片，测量在爆炸荷载作用下的模型应变值的变化规律，进行对比分析。结果表明，模型翼板上的相同测点位置的横向应变均大于其纵向应变，腹板上的相同测点位置的纵向应变均大于其横向应变；利用智能骨料的主动监测技术，监测结果显示了模型内部的损伤程度。说明压电智能骨料可以对模型在爆炸荷载作用后的损伤程度提供判定依据；应变结果与损伤结果均显示，钢筋混凝土T梁桥的翼板比腹板更容易产生破坏。

Analysis of Strain and Damage of Reinforced Concrete T-beam Subjected to Blast Load

In order to investigate the damage and dynamic response of reinforced concrete T-beam bridges under blast loading, a group of reinforced concrete T-beam bridges are made, five piezoelectric smart aggregates are pre-buried into the bridge to monitor the damage status of the bridge model, Paste 6 strain gauges on the wing and web. Measure the change of the strain value of the model under the action of blast load, and then conduct comparative analysis. The results show that the lateral strain of the same measuring point on the model wing is larger than the longitudinal strain; using active monitoring technology of smart aggregates, and the monitoring results show the internal damage state of the model, it shows that piezoelectric smart aggregates can provide a basis for determining the damage degree of a model subjected a blast load. The results of strain and damage show that the wing plate of reinforced concrete T beam is more prone to damage than the web.