混凝土构件局部开口后钢筋和混凝土变形性能试验研究

Study on Deformation Performance Test of Steel Reinforcement and Concrete after Partial Opening of Concrete Component

该文介绍了混凝土构件局部开口后钢筋和混凝土变形性能的试验。桥梁静载试验中为准确测试混凝土构件受拉区域的应变,通常需要将混凝土局部凿除,以便在钢筋的表面粘贴应变片。为验证这种方法测试的构件受拉区域应变是否准确,试验在预制全预应力混凝土梁下缘粘贴钢筋应变片和混凝土应变片,比较同一试验工况下两者之间的应变,同时结合有限元模型计算结果,判断混凝土局部凿除对钢筋应变的影响。

The article introduces the test of deformation performances of steel reinforcement and concrete after the partial opening of concrete component.In order to accurately test the strain in the tensile zone of concrete component during the static load test of bridge,it is usually required to dig out the partial concrete so as to stick the strain piece at the surface of steel reinforcement.In order to test and verify whether or not accurate is the strain of component in the tensile zone tested by this method,it is required to test the steel reinforcement strain piece and the concrete strain piece stuck at the lower border of precast pre-stressed concrete beam,to compare the strain between the both in same test condition,and at the same time according to the calculation results of the finite element model,to judge the influence of digging out the partial concrete on the strain of steel reinforcement.