预应力梁结构响应的简要荷载试验法研究

根据简要荷载试验方法,对预应力梁的结构响应进行了研究。采用单级加载的方法,以加载车在主梁控制截面处事先确定的几个停留位置,测量相应的各主梁控制截面处的挠度。依据实测主梁挠度,根据相关数理统计理论,建立主梁的荷载-挠度方程,对主梁在预期较高荷载标准车辆或重车作用下的跨中最大挠度进行预测,从而完成对钢筋混凝土简支梁桥的承载能力预测工作。通过与实桥试验数据对比可知,简要静荷载试验方法能对预应力混凝土梁在正常使用阶段的行为进行有效预测,易于在实际工程中的应用。

Research on Test Way of Behavior Response of Pre-stressed Girder Simply Live Load

Based on slmply statlc hve load test way, research on the responses oI prestressed glrder was completed. U- sing the method of acting loads by single step, let the loads acted by the vehicle on the predetermined spots of the beam, the flexivity of each beam can be measured. Utilizing the measured displacements and according to some pertinent statistical the-ories, the corresponding equation of load versus flexivity of each beam of the pinned girder bridge was founded, which can predict the maximum deformation of mid span under the more heavier loads. Compared with the tested data of the bridge, it was shown that the behaviors of service of pre-stressed concrete girder can be correctly and reliably predicted by simply stat-ic live load test, and simply static live load test can easily been applied in practical engineering.