【摘要】 研究了在钢筋与砼的强度随时间而衰减的情况下 ,砼梁的时变可靠度及其对各随机变量的敏感度。结果表明 :严格按照现行砼结构设计规范设计的梁 ,其可靠指标不一定满足目标可靠度的要求 ,甚至会出现承载力抗剪指标小于抗弯指标的情况 ;与非时变相比 ,对应的时变结构可靠度均有不同程度的降低 ,而对各随机变量的敏感度基本不变。更多还原

【Abstract】 This is the research on the time-dependent reliability of reinforced concrete beam and sensitivity analysis thereof on random variances under reducing strengths of reinforcement over time. The results showed that it is not possible to attain the appointed reliability indexes even though the flexural beam is designed according to the current procedure. Moreover,there may be a case that the shear indexes are smaller than the flexural indexes. Comparing the reliability of the reinforced concrete beam without time-dependent and with time-dependent,the one with time-dependent has reliability that is much lower and the sensitivity on random variances remains almost same.更多还原