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PROBABILISTIC APPROACH FOR ASSESSING THE ROBUSTNESS OF STRUCTURAL SYSTEMS MADE OF PRECAST AND MONOLITHIC REINFORCED CONCRETE 评估预制和整体钢筋混凝土结构体系鲁棒性的概率方法
Pub Date : 2023-01-01 DOI: 10.33979/2073-7416-2023-108-4-93-105
A.A. LIZAHUB, A.V. TUR, V.V. TUR
With the help of probabilistic modeling, the issues related to the assessment of the robustness of structural systems made of prefabricated and monolithic reinforced concrete in an accidental design situation are considered. The paper considers the concept of analyzing the reliability of structural systems and differentiating risks in accidental design situations. The existing probabilistic models of the basic variables included in the functions of loads and resistances are analyzed. Statistical parameters of the uncertainty of the resistance model are obtained and integrated in the form of a basic variable with probability modeling. Probabilistic modeling of structural systems made of precast and monolithic reinforced concrete, designed according to the current standards of the Republic of Belarus, was carried out using the Monte Carlo method. The functions of the limiting state of the structural system in an accidental design situation with the sudden removal of the central column of the first floor are determined. As a result, values of failure probabilities and corresponding reliability indices were obtained for the considered constructive systems.
在概率模型的帮助下,考虑了预制和整体钢筋混凝土结构系统在意外设计情况下的鲁棒性评估问题。本文提出了结构体系可靠性分析和事故设计风险鉴别的概念。分析了荷载和阻力函数中包含的基本变量的现有概率模型。得到了电阻模型不确定性的统计参数,并以基本变量的形式进行了概率建模。根据白俄罗斯共和国现行标准设计的预制和整体钢筋混凝土结构系统的概率建模使用蒙特卡罗方法进行。确定了在一层中心柱突然拆除的意外设计情况下结构体系极限状态的功能。得到了所考虑的构造系统的失效概率值和相应的可靠度指标。
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引用次数: 0
REINFORCED CONCRETE BEAMS TAKING INTO ACCOUNT THE REACTION OF THE THRUST UNDER SHORT-TERM DYNAMIC LOADING 考虑短期动力荷载作用下钢筋混凝土梁的反力
Pub Date : 2023-01-01 DOI: 10.33979/2073-7416-2023-108-4-57-64
O.G. KUMPYAK, Z.R. GALYAUTDINOV, D.R. GALYAUTDINOV
The article presents the results of theoretical studies of reinforced concrete beams, taking into account the limitation of horizontal displacement on supports under short-term dynamic loading. In studies, the deformation of the structure is considered in the conditionally elastic and plastic stages. It has been established that the presence of thrust leads to a significant increase in strength and a decrease in the deformability of structures, both in the conditionally elastic and plastic stages. The paper reflects the results of a numerical calculation of reinforced concrete beam structures with thrust under short-term dynamic loading based on the obtained analytical dependencies. The effect of the thrust reaction, namely the rigidity of the support contour, on the dynamic coefficient of reinforced concrete structures is considered in comparison with structures without expansion. The results of numerical studies indicate a positive effect of the expansion reaction in dynamically loaded structures at all stages of their dynamic deformation.
本文介绍了考虑短期动力荷载作用下水平位移对支撑的限制的钢筋混凝土梁的理论研究结果。在研究中,结构的变形考虑在条件弹性和塑性阶段。已经确定,在条件弹性和塑性阶段,推力的存在会导致结构强度的显著增加和变形能力的显著降低。本文根据得到的解析依赖关系,对短期动力荷载作用下带推力的钢筋混凝土梁结构进行了数值计算。与无膨胀结构相比,考虑了推力反力即支撑轮廓刚度对钢筋混凝土结构动力系数的影响。数值研究结果表明,在动力荷载作用下结构在动力变形的各个阶段,膨胀反应都具有积极的作用。
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引用次数: 0
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Stroitelʹstvo i rekonstrukciâ
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