基于静力测试数据的预应力混凝土连续梁结构损伤识别

DAMAGE DECTEION OF PRESTRESSED CONCRETE CONTINUOUS BEAM FROM STATIC RESPONSE

预应力混凝土连续梁桥是中小跨度铁路、公路桥梁的主要桥型,对既有预应力混凝土连续梁桥进行损伤识别,可以有效地预防恶性交通事故的发生。将有限元模型修正技术应用到桥梁及结构工程的损伤识别在近几年得到了迅速的发展。静力测试是桥梁工程中应用最为普遍的一种结构测试方法。本文根据静力测试结果,应用有限元模型修正技术,对一两跨预应力混凝土连续梁的结构损伤进行了识别。计算结果表明,经损伤识别后,结构的理论计算位移与试验测试结果吻合良好,经理论分析得到的损伤发展趋势正确地反映了由试验所得的预应力混凝土连续梁的结构行为。研究结果表明,本文的研究方法可以有效地用于实际工程结构的损伤识别,有着广阔的工程应用前景。

The damage detection of prestressed concrete continuous beam from static response is studied in the paper. It is the finite element model updating technique that is applied in the study. It is used for detecting the damage of a two-span continuous box beam. It is obvious that to detect the damage in existing structures can be to avoid the occurrence of casualty. It is shown that the computed deformation is well agreed with that of the test. It is found that the theoretical damage development is agreed with that of the structural behavior observed in test. The proposed approach can be used for the damage detection in the actual engineering.