Performance-Based Damage Analysis for PC Continuous Rigid Frame Bridges
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摘要: 为探讨PC(预应力混凝土)连续刚构桥开裂及下挠的原因,提出了基于结构性能的损伤分析方法.该方法立足于结构性能的客观表象,把对可能造成损伤的诸多因素对结构性能水平的影响分析作为主要手段;通过对大量理论计算与试验数据的对比分析,以基于实桥检测和荷载试验的性能水平参数作为评判依据,找出造成损伤的因素及其达到的程度,同时获得损伤桥梁较为真实的性能水平,作为可靠性评估和加固设计的依据.通过对一座跨径160 m的PC连续刚构桥基于性能的损伤分析,结果表明:用该方法,结构挠度的校验系数可达0.9.Abstract: In order to find out the causes of the cracking and deflection of PC(prestressed concrete) continuous rigid frame bridges,a damage analysis method based on structure performance was proposed.In this method,the objective manifestations of structure performances are considered as the focus of attention,and the analysis of damage factors for structure performances is as the primary means.By comparing a large number of theoretical and test data and using load test data as a judgment basis to identify damage elements and damage degree,a more realistic performance level of a damaged bridge is obtained,and this performance level can be used as the basis of reliability evaluation and strengthening design.The damage analysis of a PC rigid frame bridge with a span of 160 m,as an example,shows that with the proposed method,the check coefficient of deflection can reach to 0.9.
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