无筋钢纤维混凝土偏心受压计算方法研究

基于沈阳轨道交通9号线盾构隧道工程管片的实际受力,进行了无筋钢纤维混凝土偏心受压试验,分析了构件在偏压作用下的断面应力分布、裂缝发展及破坏规律,提出了适合该类构件的计算方法。试验结果表明,无筋钢纤维混凝土构件在相对偏心距大于0.5后承载力急剧下降,即该类构件适用于相对偏心距较小的情况。在构件受力全过程中,混凝土受压区段均处于弹性状态。基于试验结果,提出了修正受压区应力分布状态的无筋钢纤维混凝土偏压正截面计算方法,明确了受压区纤维混凝土强度系数的取值。

Research on Calculation Method of Eccentric Compression of Steel Fiber Reinforced Concrete

Guiding by the actual stress of the segment of the shield tunnel project of Shenyang Rail Transit Line 9,several sets of eccentric compression tests of unreinforced steel fiber reinforced concrete were conducted,and section stress distribution and crack development of members under compression and bending were analyzed and a calculation method suitable for this kind of component was put forward.The test results show that the bearing capacity of steel fiber reinforced concrete members without steel bars decreases sharply after the relative eccentricity is greater than 0.5 and this type of members is suitable for situations where the eccentricity is small.During the entire process of the component,the concrete compression section is elastic status.Based on the experimental conclusions,a calculation method for the unstressed steel fiber reinforced concrete biased normal cross-section is put forward,and the value of the fiber reinforced concrete strength coefficient in the compressed area is determined.