竖向载荷作用下框架结构力学模型的简化与计算

针对结构力学与工程结构设计中力学模型和载荷作用方式的简化,分别采用一次性加载法、模拟施工三加载法和分层法,研究了竖向载荷作用下框架结构力学模型的简化与计算,分析了三种方法的计算假定和计算结果,给出了合理适用范围。一次性加载法更适用于抗连续性倒塌分析和建筑结构改造设计计算,模拟施工三加载法更适用于新建工程的设计计算,分层法作为一种简化的手算方法可作为理解结构力学原理的基本方法。

MECHANNICAL MODEL AND CALCULATION OF FRAME STRUCTURES UNDER VERTICAL LOADING1)

For simplifying the mechanical models and the loading patterns in structural mechanics and the design of engineering structures, three methods, including a semi-static loading method, a three-step loading method for simulating the construction process and a multi-layer method, are adopted to study the simplification and the calculation of the mechanical models of frame structures under the action of vertical load. The assumptions made in the calculation by the three methods and the calculation results are analyzed, and reasonable scopes for the application are suggested. The results demonstrate that the semi-static load method is more suitable for the analysis of the progressive collapse and the design and the calculation of the building structure modification while the three-step loading method is more applicable for the design and the calculation of new projects. In addition, as a simplified calculation method by hand, the multi-layer method can be used as a basic method for understanding the principles of structural mechanics.