Development Of Test System Of Reinforced Concrete Beams With Two Cantilevers

Beams with two cantilevers were widely applied in production, our life and engineering. Although a great deal work have been done to theoretical research of beams with two cantilevers structure, we paid attention to test systems used in beams with two cantilevers mechanics test less. And school, incorporated teaching and researching, needed this small or medium octavo test system to develop teaching and researching. So joining in this development item of test system established by school, the thesis aimed to develop a set of simple, economical and applicable test system of reinforced concrete beams with two cantilevers to serve for teaching and researching, and make it a powerful supplement in structural experiment field. In researching and development of this thesis, a suit of two cantilevers experimentation device was designed and done in this thesis for making stress and distortion of cantilever end of test beam accorded with stress and distortion of cantilever beam in theory, the device was used to put extra restriction on test beams and made test beams be in pressed state accorded with cantilever beam. In test system of reinforced concrete double cantilever beams, strain,deflection and load were principal experimental contents. The thesis expounded strain-measuring method, deflection-measuring method and strain-measuring method used in the test system by probing into basic theory, and introduced BQ120-5AA strain gauge,YD-28A dynamic resistance strain gage and PCL-812PG data acquisition card,DA-30 LVDT and mating data collector ,constant load machine and experimentation equipment of reinforced concrete beams with two cantilevers used in test. In addition, the thesis also programmed with Visual Basic for test and control. In addition, some test beams, used for verifying the test system, were designed and made . In the end, we did a validating test that the homemade experimental beams were loaded with this test system. The experimental results indicated: ⑴Loading equipment could afford load experimentation, bearing status of beam was in status of two cantilevers; ⑵Achieving expecting test function, test system could be used to measure and save data of strain, deflection and load in experimentation; ⑶Might serve for teaching and researching by proceeding correlative tests.