【作者】 潘振；

【导师】 黄新；

【作者基本信息】 南京林业大学 ， 森林工程， 2004， 硕士

【摘要】 钢筋混凝土或预应力混凝土简支梁在中小跨径桥梁中应用最为广泛。尽管对简支梁的理论研究和相应的试验开展得比较多，但是结构试验的试验体系却相对匮乏，特别是作为教学与研究为一体的中小型试验测试体系更是少见，故本课题力图研制开发一套简单、经济、适用的钢筋混凝土简支梁试验系统，作为对简支梁结构试验领域的补充。 应变和挠度是钢筋混凝土简支梁试验系统的两项主要测试内容。论文通过对基础理论的探讨，阐述了本课题采用的应变测量方法和挠度测量方法，介绍了在本开发试验中测量应变使用的BQ120-5AA电阻应变片、YD-28A型动态电阻应变仪和PCL-812PG数据采集卡以及测量挠度使用的DA-30型差动变压器式位移传感器和配套使用的数据采集器。 为了保证测量的准确性，试验系统的抗干扰措施必不可少。经过分析，本试验系统结构简单，来自外界的干扰很小，所以对本试验系统不必采取特殊的抗干扰措施，只需在导线的选择和连接上采取一定措施，即可达到抗干扰的目的。 为了完成试验研究，课题确定了试验系统加载设备的主要参数，包括静力加载装置和动力荷载模拟装置，论文中描述了其主要部件、工作原理和工艺参数，设计并浇注了试验用梁，并利用Visual Basic语言开发了测试和控制用的程序。 最后，论文结合两个开发试验，即钢筋混凝土正截面受力试验和结构动力反应试验，详细说明了开发的试验控制程序。试验结果表明：(1)设计的加载装置能够实现静力加载和动力加载；(2)开发的试验控制程序能够稳定运行，实现了预定的功能，即动态实时显示试验结果，自动保存试验结果，并且可以回放试验结果；(3)能够利用设备和程序做简支梁的试验，可以对简支梁的受力性能进行研究。更多还原

【Abstract】 Reinforced concrete simple-supported beams or prestressed concrete simple-supported beams are widespread applied to middle-small span bridges. Although theoretical research and experiments are conducted so much, structural test systems for simple-supported beams are relatively scarce, especially for teaching and research. The thesis aims to develop a set of simple, economical and applicable test system of reinforced concrete simple-supported beams and make it a powerful supplement in structural experiment field.Strain and deflection are two principal experimental contents. The thesis expounds strain-measuring method and deflection-measuring method used in this test system on the basis of analysis of basic theory and introduces BQ120-5AA strain gauge, YD-28A dynamic resistance strain gage, PCL-812PG data acquisition card, DA-30 LVDT and mating data collector.To keep the measuring accuracy, anti-interference measures are inevitable. Because of simple constitution and little interference from outside, special anti-interference measures are not necessary. The aim of anti-interference can be attained only by means of selection and collection of wire.In order to accomplish experimental research, the thesis decides key parameters of loading equipment including static loading equipment and simulating equipment of dynamic load and describes their key components, operating principle and technological parameters. Test beams are designed and made. The thesis also programs with Visual Basic for test and control.In the end, the thesis combines two development tests, namely loading test of normal section of reinforced concrete simple-supported beams and structural dynamic test, to explain their program flow charts in detail. The experimental results indicate (1) loading equipment can afford static load and dynamic load; (2) program run is stable and program can acquire expecting destiny, namely displaying real-time, auto-saving and replaying experimental results; (3) utilizing present equipment and program, load test of simple-supported beams can be studied.更多还原