Experiments And Analysis On Structural Performances Of Structural Laboratory Reaction Wall Based On Optical Fiber Sensor Technology

Structural laboratory is a indispensable hardware platform to conduct scientificexperiments in the field of civil engineering, and especially its reaction wall and pedestalsystem is a must to conduct large scale components, full-size component tests and structuralstatic, dynamic experiments as well. The reaction wall and pedestal belong to large scalestructures in3D, and their stress state are quite complex. As with national economicdevelopment, there are more and more structural labs building in universities and researchinstitutes. However,at present, the design and construction of reaction wall system is still lackof corresponding code, standard, design software and suitable calculation method. Therefore,it is necessary to provide strong basis through theoretical analysis and field tests.In this paper, the structural performances of reaction wall and pedestal were tested andanalyzed according to the design and construction process of reaction wall and pedestal ofHenan University of technology. The main research contents:1) considering that large amountof steel angle were used in the reaction wall and loading location hole, two finite elementsolid models of major reaction wall with and without steel angle respectively in3D were built,and the lateral displacement of major reaction wall and the stress of steel bars and concreteunder self weight, prestress and design load were analyzed;2) combing the constructiontechnology process of the reaction wall and pedestal, the fiber steel rebar meter, fiber straingauge and fiber temperature gauge were fixed on their reinforcing steel bars, their mechanicalproperties were tested in-suit during the whole construction process such as during thepouring of concrete, under the self weight and during the prestressed tensioning process andso on;3) in order to improve the numerical model, numerical results were compared withexperimental data.The maximum lateral displacement of reaction wall obtained from the finite elementmodel is3.384mm, which is less than the required value of design. The overall stiffness ofreaction wall is much larger. Comparing the results of two models, one with steel angel andthe other without, it is acquired that the contribution of steel angel to the whole structureaccounts for1.7percentage; comparing the field test results and numerical results, it is acquired that the stress and strain of steel bar in the reaction wall under self weight are muchlager, while they are much smaller under prestress; the fixed fiber bragg grating sensors in thepresent experiment lay the foundation of monitoring of later service phase and healthmonitoring of the whole process. Some achievements acquired in this paper would provideexperimental data and theoretical basis to the design,construction, post-test of the structurallab as well as some related similar engineerings.