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为研究高强钢-混凝土组合梁在静载作用下的受弯性能,共进行了8根简支梁在跨中两点对称荷载作用下的试验。8根试件均为完全剪力连接,主要变化参数为混凝土强度等级和钢梁强度等级。加载方式为单调静力加载,试验测量内容主要为竖向加载荷载、挠度、截面应变等。试验结果表明,所有试件均发生典型的弯曲破坏,高强钢与混凝土通过栓钉连接表现出良好的整体工作性能。现行规范中的简化塑性计算方法可以较准确地预测该类型梁的极限受弯承载力。根据该塑性理论方法,对组合梁进行了参数分析,主要变化参数为混凝土强度等级和钢梁强度等级。分析表明,其他条件相同时,相比混凝土强度,钢梁强度是影响组合梁受弯承载力的主要因素。研究为高强钢在组合梁中的应用提供了试验依据。
In order to study the flexural behavior of high-strength steel-concrete composite beams under static load, a total of eight simple supported beams were tested under two-point symmetrical load. All the eight specimens were completely sheared, and the main parameters were the concrete strength and the strength of steel beams. The loading method is monotonic static loading, and the experimental measurement contents mainly include vertical load, deflection, cross-sectional strain and the like. The test results show that all the specimens have typical bending failure, and the high strength steel and concrete show good overall workability through the peg connection. The simplified plastic calculation method in current code can predict the ultimate flexural capacity of this type of beam more accurately. According to the plastic theory, the parameters of the composite beam are analyzed. The main variation parameters are the concrete strength grade and the steel beam strength grade. The analysis shows that compared with the concrete strength, the strength of the steel beam is the main factor that affects the flexural capacity of the composite beam when the other conditions are the same. The research provided a test basis for the application of high strength steel in composite beams.