Yuan Jian, Lai Jie, Xu Feng, Wu Zhengfa, Yu Suhui, Sun Guorui
School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430205, China.
Academy of Combat Support, Rocket Force University of Engineering, Xi'an 710025, China.
Materials (Basel). 2022 May 26;15(11):3785. doi: 10.3390/ma15113785.
This paper analyses the characteristics of the mechanical behavior of a trussed steel and concrete box beam under bending conditions based on the structural stressing state theory and the numerical shape function method. Firstly, the parametric generalized strain energy density was introduced to characterize the structural stressing state of trussed steel stud concrete box girders, and the strain energy density sum was plotted. Then the Mann-Kendall criterion was used to discriminate the leap point of the curve change and to redefine the structural failure load. By analyzing the strain and displacement, the existence of a sudden change in the structural response during the load-bearing process was again demonstrated. Afterwards, the numerical shape function method was used to extend the strain data, and further in-depth analyses of strain/stress fields and internal forces were carried out to show in detail the working characteristics of each under load. Through an in-depth analysis from different angles, the rationality of updating the failure load was verified. Finally, the effects of different structure parameters on the evolution of the structural stresses of the members were analyzed in a transversal comparison. The analysis results of the stress state of a steel-concrete truss structure reveal the working behavior characteristics of a steel-concrete truss structure from a new angle, which provides a reference for the design of a steel-concrete truss structure in the future.
本文基于结构受力状态理论和数值形函数法，分析了带桁架的钢与混凝土组合箱梁在弯曲条件下的力学行为特征。首先，引入参数化广义应变能密度来表征带桁架的钢-混凝土组合箱梁的结构受力状态，并绘制应变能密度总和图。然后，使用曼-肯德尔准则来判别曲线变化的跳跃点，并重新定义结构破坏荷载。通过分析应变和位移，再次证明了结构在承载过程中响应存在突变。之后，采用数值形函数法扩展应变数据，并进一步深入分析应变/应力场和内力，以详细展示各部分在荷载作用下的工作特性。通过从不同角度进行深入分析，验证了更新破坏荷载的合理性。最后，通过横向比较分析了不同结构参数对构件结构应力演化的影响。钢-混凝土桁架结构应力状态的分析结果从一个新的角度揭示了钢-混凝土桁架结构的工作行为特征，为今后钢-混凝土桁架结构的设计提供了参考。
