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针对活载与恒载比值高的情况,提出了梁中预应力随活载变化而变化的智能控制方法,即根据梁承受的荷载情况,在梁中配置适当的智能锚具,通过智能锚具的顶升、回缩改变梁中的预应力大小,从而实现梁监控点处的挠度或应变始终被控制在目标范围内。基于开关控制算法,采用模拟信号控制系统进行了智能预应力简支梁在缓慢移动荷载作用下的挠度控制试验,采用数字信号控制系统进行了智能预应力斜拉桥在缓慢移动荷载作用下的应变控制试验。试验结果验证了控制思想的可行性,同时为快速移动荷载下的智能控制提供试验基础。
In view of the situation that the ratio of live load to dead load is high, an intelligent control method is proposed to change the prestress in the beam with the variation of the live load. According to the load condition of the beam, an appropriate smart anchor is deployed in the beam, Of the rise, retraction to change the beam prestress size, so as to achieve the beam monitoring point deflection or strain is always controlled within the target range. Based on the switch control algorithm, the deflection control experiment of the smart prestressed simply supported beam under the action of slow moving load was carried out by using the analog signal control system. The digital prestressed cable-stayed bridge under the action of slow moving load was controlled by digital signal control system Control test. The test results verify the feasibility of control ideas and provide experimental basis for intelligent control under fast moving loads.