CALCULATION MODEL OF A MULTI-STOREY REINFORCED CONCRETE FRAME WITH COMPLEXLY STRESSED BEAMS UNDER ACCIDENTAL IMPACT

Q4 Engineering International Journal for Computational Civil and Structural Engineering Pub Date : 2023-06-27 DOI:10.22337/2587-9618-2023-19-2-150-160

V. Moskovtseva, S. Fedorov, M. Amelina

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Abstract

A computational model is presented for determining deformations in complexly stressed beams of a structurally non-linear reinforced concrete frame in a transcendental state caused by a special emergency action in the form of a sudden removal of one of the structural elements. The determination of the stress-strain state after the formation of spatial cracks in the reinforced concrete elements of the frame was carried out using the calculated spatial section. At the same time, dynamic additional loads in the design section of the reinforced concrete frame element from a special impact are determined on an energy basis using the “bending moment-curvature” and “torque-angle of rotation” diagrams. The considered calculation algorithm includes the determination of forces in compressed concrete, longitudinal and transverse reinforcement for primary and secondary design schemes and verification of special limit state criteria. The results of a numerical analysis of the effect of cracking, the ratio of torque and bending moment on the stress state in transverse and longitudinal reinforcement and on the dissipative properties of a frame structural system are presented

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具有复杂应力梁的多层钢筋混凝土框架在意外冲击下的计算模型

提出了一种计算模型，用于确定结构非线性钢筋混凝土框架复杂应力梁在结构单元突然移除的特殊紧急作用下处于超越状态时的变形。利用计算得到的空间截面，确定了框架钢筋混凝土构件空间裂缝形成后的应力-应变状态。同时，利用“弯矩-曲率”图和“扭矩-转角”图，以能量为基础确定了钢筋混凝土框架单元设计截面中特殊冲击作用下的动附加荷载。所考虑的计算算法包括压缩混凝土受力的确定、一次和二次设计方案的纵向和横向配筋以及特殊极限状态准则的验证。本文给出了裂缝、弯矩比对框架结构横向和纵向钢筋受力状态及耗散性能影响的数值分析结果

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