大跨度PC梁桥应力测试的若干问题

Several Problems About Stress Test for a Large SpanPrestressed Concrete Beam-Bridge

将钢弦应变传感元件用于大跨度预应力混凝土梁桥施工中,对箱梁关键截面的应力实施跟踪测试和控制．通过对实际工程结构测试应力数据的误差分析,使实测应力更接近结构实际应力,保证了施工质量．从而为结构应力分析、结构设计变更和施工质量评价提供了依据．

During construction of a large span prestressed concrete beam-bridge, a set of strain transducers are in-stalled at its key sections for measuring the structural strains. With the help of error analysis, the stress test results ofa large span prestressed concrete beam-bridge are approximate to the actual structural stresses. It is the basis that canbe used to analyze the structural stresses,modify the structural design and estimate the engineering quality.