大跨度混凝土桥梁预应力摩擦损失的理论研究  

THEORETIC RESEARCH ON FRICTION LOSS OF PRE-STRESS IN LARGE-SPAN CONCRETE BRIDGE

作　　者：刘鹏飞[1,2] 赵启林[1] 江克斌[1] 高和生[1] 

机构地区：[1]解放军理工大学工程兵工程学院,南京210007 [2]7188部队,山东烟台265801

出　　处：《工业建筑》2011年第10期64-67,共4页Industrial Construction

基　　金：江苏省自然科学基金资助项目(BK209467)

摘　　要：许多大跨度桥梁在预应力张拉过程中发现结构实际效应难以达到理论预期效果。通过对大量桥梁摩擦损失的实测结果的统计分析,指出摩擦损失过大可能是导致以上现象发生的主要原因。随后从现有的摩擦损失计算模型出发,通过理论与实测数据的分析,指出:现有摩擦损失与索长的非线性关系、计算中忽略平弯角以及应力状态影响等是导致长索摩擦损失理论值经常小于实测值的主要原因。最后,提出了摩擦损失计算的改进建议。It has been found that the actual pre-stress effect is hard to reach its expected theoretic value during the tension process in many large-span bridges. It can be explained in a large part by the excess friction loss of pre-stress by the statistical analysis of the measured results of the friction loss of numerous bridges. Based on current calculation model for friction loss, the analysis of the theoretic value and the measured results shows that the non-linear relationship between friction loss and cable length, the ignorance of plane-bending angle in calculation and the effect of stress state are the main reasons for the smaller theoretic value regularly as compared with the measured results. Finally some suggestions are made to improve the calculation of friction loss.

关 键 词：大跨度 桥梁 预应力 摩擦损失 理论研究 

分 类 号：U448.33[建筑科学—桥梁与隧道工程]