弧形钢闸门支承钢梁横向加劲肋布置研究

Study on the arrangement of the bearing steel beams transverse stiffeners of the radial steel gate

关于水工平面钢闸门主梁梁高的选取问题,规范未给出通用的取值范围,在工程中多以未考虑主梁与其他构件协同工作的理论求解公式为参考。在满足稳定性要求、考虑面板及隔板等构件与主梁协同工作的条件下,采用有限元分析理论,建立平面钢闸门空间有限元模型,计算分析主梁的强度和刚度的变化规律,给出合理的平面钢闸门主梁的最优梁高。结果表明:在考虑各构件协同工作时的主梁受力更贴合实际情况;在最小梁高与经济梁高之间存在最优梁高,与最小梁高的比值约为1.038,与理论公式计算的最优梁高相比,可使主梁翼缘、腹板等构件的应力减小,在此梁高下可使主梁工作性能发挥到最优。计算结果可为平面钢闸门梁高的设计提供参考。

The bearing steel beam of the radial steel gate has the advantages of simple form,rapid assembly and effective reduction of lock chamber space,whose safety is directly related to the safe operation of the gate.Therefore,it is very important to design a bearing steel beam of the radial steel gate with a reasonable structure,and the stiffening rib is the important component for ensuring the local stability of the steel beam and improving the strength and rigidity.Under the condition of satisfying local stability,the reasonable interval of the transverse stiffener distance of the bearing steel beam was given by establishing the three-dimensional finite element model of different distance of the transverse stiffener of the bearing steel beam and calculating as well as analyzing the influence law on the strength and stiffness of the bearing steel beam.The result showed that the transverse stiffener distance has a great influence on the stress of the bearing steel beam flange and the stiffener itself,but has negligible effect on the web stress.When the transverse stiffener distance of the bearing steel beam was(1/3,1/2)times the web height,the performance of the steel beam material was fully exerted,and the strength and rigidity of the bearing steel beam met the requirements of the specification,which is both economical and rational.The research results can provide reference for the design of the bearing steel beams of the radial steel gate.