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为给辽宁省地方标准的编制提供依据,对钢管高性能混凝土受弯构件的静力性能展开研究。通过18个试件(内填自密实混凝土的立方试块抗压强度标准值为96 MPa)的静力试验,发现钢管高性能混凝土受弯构件的跨中弯矩-曲率曲线可以分为弹性阶段、弹塑性阶段和下降段。试件挠曲线接近正弦半波曲线,钢管纵向应变基本符合平截面假定,环向受压的钢管对混凝土没有约束力。应用有限元法模拟了试件的跨中弯矩-曲率曲线和变形模态,模拟结果与试验结果吻合良好。总体而言,钢管高性能混凝土受弯构件与普通钢管混凝土受弯构件在静力性能方面没有本质区别。
In order to provide a basis for the compilation of local standards in Liaoning Province, the static performance of high performance concrete flexural members of steel tube was studied. Through the static test of 18 specimens (compressive strength of cubic specimen filled with self-compacting concrete being 96 MPa), it is found that the mid-span moment-curvature curve of high-performance concrete-filled steel tubular members can be divided into elastic stages , Elastic-plastic phase and descending phase. The flexural curve of the test piece is close to the sine half-wave curve. The longitudinal strain of the steel pipe basically conforms to the assumption of the flat cross-section. The steel pipe subjected to the circumferential compression has no binding force on the concrete. The midspan bending moment-curvature curve and deformation mode of the specimen were simulated by finite element method. The simulation results are in good agreement with the experimental results. In general, there is no essential difference in the static performance between steel high performance concrete flexural members and ordinary CFST flexural members.