基金项目：陕西省自然科学基金项目(Z04-01025)
作者简介：刘龄嘉(1963-),女,广西靖西人,长安大学高级工程师,博士研究生,从事在役预应力混凝土桥梁结构的安全评估研究.86-29-82334837, liulingjia2004@yahoo.com.cn.
作者单位：刘龄嘉（长安大学,桥梁与隧道陕西省重点实验室,陕西,西安,710064）
贺拴海（长安大学,桥梁与隧道陕西省重点实验室,陕西,西安,710064）
赵小星（长安大学,桥梁与隧道陕西省重点实验室,陕西,西安,710064）
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