集中荷载作用下工字型钢-混凝土组合梁稳定性研究

钢—混凝土组合梁结构是当前土木工程建设中重要的建筑结构形式,其承载能力的有效发挥对于实际工程意义重大.但是,当前对于钢—混凝土组合梁结构稳定性计算方法以及结构设计还没有较为明确的标准和规范,所以给工程实际带来很大的不便.对集中荷载作用下工字型钢—混凝土组合梁结构的侧向失稳问题进行研究.根据集中荷载作用下工字型钢—混凝土组合梁变形特征,建立了集中荷载作用下组合梁翼缘侧向屈曲失稳的力学模型以及侧向弯扭力学模型.运用能量法,分别求解两种模型的结构变形势能,并根据势能驻值原理,采用变分法,进行结构失稳临界荷载的求解.并通过对两种模型的对比,来确定更加便于工程实践的力学模型和计算方法;通过实例对文中两种模型下的临界失稳求解计算方法进行验证,并与国内外关于组合梁稳定性的计算模型和方法进行比较,验证计算模型和计算方法的可行性.

Research on the Stability of I-shaped Steel-concrete Composite Beam under the Action of Concentrated Load

Steel-concrete composite beam structure is an important form of building structure in civil engineering construction,whose bearing capacity being effectively realized is of great significance for practical engineering.However,currently we do not have explicit standards and norms for the stability calculation method and structural design of steel-concrete composite beam structure,which brings about great inconvenience for the practice.The study verifies the calculation methods for critical buckling under two models proposed in the paper through examples,and compares domestic and foreign calculation models and methods on the stability of composite beam, which verifies the feasibility of calculation models and methods.