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模拟剪力和弯矩共同作用下钢筋混凝土结构的响应,包括发生在开裂后和极限荷载范围时的各项性能。目前的2维(平面应力和平面应变)和3维非线性有限元方程模拟上述结构响应的成本很高,而且不适用于日常工程实践。提出1种新型框架单元模型,结合高效的带梁-柱单元的平面内全耦合剪切-正常节段模型,适用于已得到试验结果验证的结构分析。标准剪切下的应力和应变假定为由一系列多项式形函数组成;每一个应力分布受内部材料状况影响。框架结构的非线性分析采用的是广义矩阵法,利用文献资料验证该模型,通过试验验证剪切应变对结构响应的影响程度。试验结果和模型分析结果吻合较好。该模型得到的混凝土和钢筋的位移、应变和应力及不同的破坏类型,比之前模型的分析结果更精确。
The response of reinforced concrete structures combined with shear and bending moments is simulated, including behavior after cracking and ultimate load. The current 2-D (Planar Stress and Planar Strain) and 3-D nonlinear finite element equations simulate these structural responses at high cost and are not suitable for routine engineering practice. A new type of frame element model is proposed, which is suitable for structural analysis that has been validated by experimental results, combined with an efficient in-plane fully coupled shear-normal segment model with beam-column elements. Stress and strain under standard shear are assumed to consist of a series of polynomial shaped functions; each stress distribution is affected by the internal material conditions. The nonlinear analysis of the frame structure uses the generalized matrix method. The paper verifies the model by literature data, and verifies the influence of shear strain on the structure response through experiments. The experimental results are in good agreement with the results of the model analysis. The displacement, strain and stress of the concrete and rebar obtained by this model and the different types of failure are more accurate than those of the previous model.