混凝土梁桥加固模糊随机可靠度分析

以模糊随机变量为基本变量，定义了模糊随机功能函数，以挠度为指标建立了既有桥梁加固前后正常 使用极限状态下模糊随机极限状态方程. 利用等效关系将模糊随机变量当量随机化，给出了挠度抗力的取值范 围，讨论了挠度抗力在加固前后对可靠度指标的影响. 结果表明模糊计算模式较定量计算模式可靠度指标更为 保守，加固后桥梁更加安全；挠度抗力和荷载作用下竖向挠度对可靠度指标的影响互相关联；桥梁加固后， 粘贴钢板加固方式对提高梁体抗变形能力优于粘贴碳纤维板法.
Basedonthefuzzyrandomvariable,thefuzzyrandomfunctionfunctionisdefined,andthefuzzyrandomlim? itstateequationisestablishedforthelimitstateofthebridgebeforeandafterreinforcement.Byusingtheequivalentre? lation,therandomvariablesofthefuzzyrandomvariablesareequivalent,therangeofthedeflectionresistanceisgiven. Theresultsshowthatthefuzzymodelisthequantitativecalculationmodelofreliabilityindexismoreconservative,more strengthenedbridgesafety;influenceonthereliabilityindexofresistanceandloaddeflectionundertheactionofvertical deflectionofinterconnected;bridgereinforcement,reinforcementofbondingsteelplatetoimprovethebeamdeformation resistanceisbetterthancarbonfiberplatemethod.