| 基于裂缝特征的PC简支梁损伤刚度评估方法 |
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| 引用本文： | 赵煜,周博,贺拴海,葛耀君.基于裂缝特征的PC简支梁损伤刚度评估方法[J].长安大学学报(自然科学版),2011(4). |
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| 作者姓名： | 赵煜 周博 贺拴海 葛耀君 |
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| 作者单位： | 长安大学公路学院;同济大学桥梁工程系; |
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| 基金项目： | 国家自然科学基金项目(50908017); 国家西部交通建设科技项目(200831881270) |
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| 摘 要： | 为了研究预应力混凝土(PC)梁桥下挠与开裂后的结构性能评估方法,基于预应力混凝土简支梁的弯曲裂缝统计特征,考虑材料非线性特征,采用截面数值分析法,建立截面平衡迭代格式和截面损伤刚度表达式,提出了基于裂缝特征的预应力混凝土简支梁损伤刚度评估方法。分别采用规范法、基于实际裂缝特征的方法以及截面平衡分析法进行了模型桥验证。试验结果表明,截面一旦开裂,截面刚度迅速衰减,挠度迅速增大,刚度的衰减呈前快后慢的特点。采用本文提出的计算方法得到的荷载挠度曲线最接近于试验值。
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| 关 键 词： | 桥梁工程 预应力混凝土梁 损伤刚度 截面分析 裂缝统计特征 |
Damage stiffness assessment method based on fracture characteristics of PC simply-supported beam |
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| ZHAO Yu,ZHOU Bo,HE Shuan-hai,GE Yao-jun.Damage stiffness assessment method based on fracture characteristics of PC simply-supported beam[J].JOurnal of Chang’an University:Natural Science Edition,2011(4). |
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| Authors: | ZHAO Yu ZHOU Bo HE Shuan-hai GE Yao-jun |
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| Institution: | ZHAO Yu1,2,ZHOU Bo1,HE Shuan-hai1,GE Yao-jun2(1.School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China,2.Department of Bridge Engineering,Tongji University,Shanghai 200092,China) |
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| Abstract: | In order to study the evaluation method of structural performance of PC beam after cracking and deformation,an iteration method of section equilibrium and an expression of damage bending rigidity are put forward with the section numerical analysis and material nonlinearity an-alysis based on fracture characteristics of PC simply-supported beam.The damage stiffness analysis method of PC simply-supported beam is presented.According to the model test,the results show that,once the section is cracked,the bendin... |
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| Keywords: | bridge engineering prestressed concrete beam damage stiffness section analysis statistical cracking characteristic |
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