剪切型钢筋混凝土柱抗剪承载力计算的概率模型

发布时间：2018-05-25 21:29

本文选题：钢筋混凝土柱 + 抗剪承载力　；参考：《工程力学》2017年07期

【摘要】：现有的钢筋混凝土(RC)柱抗剪承载力计算模型大多属于确定性模型,难以有效考虑几何尺寸、材料特性和外荷载等因素存在的不确定性,导致计算结果的离散性较大,且计算精度和适用性有限。鉴于此,该文结合变角桁架-拱模型和贝叶斯理论,研究建立了剪切型RC柱抗剪承载力计算的概率模型。首先基于变角桁架-拱模型理论,并考虑轴压力对临界斜裂缝倾角的影响,建立了剪切型RC柱抗剪承载力的确定性修正模型;然后考虑主观不确定性和客观不确定性因素的影响,结合贝叶斯理论和马尔科夫链蒙特卡洛(MCMC)法,建立了剪切型RC柱的概率抗剪承载力计算模型;最后通过与试验数据和现有模型的对比分析,验证了该模型的有效性和实用性。分析结果表明,该模型不仅可以合理描述剪切型RC柱抗剪承载力的概率分布特性,而且可以校准现有确定性计算模型的置信水平,并且可以确定不同置信水平下剪切型RC柱抗剪承载力的特征值。
[Abstract]:Most of the existing models for calculating the shear capacity of RC columns belong to deterministic models. It is difficult to effectively consider the uncertainty of geometric dimensions, material characteristics and external loads, which leads to the greater discreteness of the calculation results. And the accuracy and applicability of the calculation are limited. In view of this, the probabilistic model of shear bearing capacity of shear RC columns is established by combining the variable angle truss-arch model and Bayesian theory. Firstly, based on the theory of variable angle truss-arch model and considering the influence of axial pressure on the inclined angle of critical oblique crack, a deterministic modified model of shear bearing capacity of shear RC columns is established. Then considering the influence of subjective uncertainty and objective uncertainty, combined with Bayesian theory and Markov chain Monte Carlo (MCMC) method, the probabilistic shear bearing capacity model of shear RC columns is established. Finally, the validity and practicability of the model are verified by comparing with the experimental data and the existing models. The results show that the model can not only reasonably describe the probability distribution characteristics of shear bearing capacity of shear RC columns, but also calibrate the confidence level of the existing deterministic calculation models. The characteristic values of shear bearing capacity of shear RC columns with different confidence levels can be determined.
【作者单位】：广西大学土木建筑工程学院;工程防灾与结构安全教育部重点实验室;广西防灾减灾与工程安全重点实验室;
【基金】：国家自然科学基金项目(51368006,51478125) 广西重点实验室系统性研究项目(2013ZDX06)
【分类号】：TU375.3

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