【摘要】 采用三维体元,进行4座旧桥现状车载(大于设计车载的2 5倍)下的有限元分析,对其承载力进行评定。结果表明,4座旧桥中有1座桥必须拆除,2座桥需要适当加固,1座桥不需要加固。用随机有限元计算旧桥在现状车载下的剩余可靠度结果表明,精确的分析模型能挖掘桥梁的承载潜力。用PSAP计算可靠度指标的灵敏度发现,可靠度指标对混凝土弹性模量比活载更敏感。更多还原

【Abstract】 By 3D solid element method, the finite element analysis was carried out on 4 existing bridges under current vehicle load (which is 25 times higher than the designed vehicle load) and the bearing capacity was (assessed). Evaluation results showed that one bridge among them should be demolished. Two should be strengthened and remained one behaved well under such heavy vehicle loads. The remained reliability of existing bridges under current vehicle load was calculated by stochastic finite element. The results indicate that the potential of bridge bearing capacity can be obtained by analyzing precisely the model. The sensibility of reliability indexes was calculated by program PSAP. It is found that the reliability indexes for concrete modulus of elasticity is more sensitive than that of live load.更多还原