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SENSITIVITY ANALYSIS ON RANDOM VARIABLES OF STRONG SHEAR WEAK BENDING DESIGN RELIABILITY OF RC COLUMN
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摘要: 研究了在地震作用下钢筋混凝土柱强剪弱弯设计可靠度及其对随机变量的敏感度分析方法计算了在不同的柱截面尺寸、不同的配筋率与配箍率、不同的剪切增强系数时柱强剪弱弯设计可靠度指标与敏感度指标。结果表明：柱强剪弱弯设计可靠度指标对抗剪计算模式、混凝土抗拉强度十分敏感，规范所采用的剪切增强系数难以保证强剪弱弯设计可靠度。因此，现行《混凝土结构设计规范》(GB50010-2002)所采用的抗剪设计公式需要进一步完善，剪切增强系数应该适当提高，同时，混凝土抗拉强度的统计参数提供要相对精确。Abstract: The strong shear weak bending design reliability of RC column and sensitivity thereof on random variables under earthquake action are calculated. The influence of section dimensions, reinforcements areas and hoop reinforcements areas and shear-enlarged coefficients on reliability and sensitivity thereof is investigated. The results indicate that strong shear weak bending design reliability, which cant be ensured by shear-enlarged coefficients taken in the current design code, is very sensitive on calculating model of shear-resistance and concrete fiexural strength. So the calculating model of shear-resistance taken in the current design code is necessary to be perfected and the statistical characters of concrete flexural strength should be more accurate.
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[2] 马洪旺.钢筋混凝土柱强剪弱弯设计可靠度分析.清华大学学报,2002(2):96～99; GB 50010-2002 混凝土结构设计规范; [3] Hohenbichler M, Rackwitz R. First Order Concepts in System Reliability. Struct Safety, 1983(1):81～88; [4] 朱平华,陈华建.混凝土轴压构件时变可靠性的敏感度研究.武汉理工大学学报,2004(3):78～84; [5] 贡金鑫,赵国藩.串联结构体系可靠度的二元泰勒级数展开.计算力学学报,1997(1):78～83; [6] 赵国藩.工程结构可靠性理论与应用.大连:大连理工大学出版社,1996.55～59; [7] 沈在康.混凝土结构设计新规范应用讲评.北京:中国建筑工业出版社,1993.24～32 -
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