| 跨海桥梁基础结构正常使用极限状态的设计方法 |
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| 引用本文： | 金伟良,胡琦忠,帅长斌,于群力,鲁征.跨海桥梁基础结构正常使用极限状态的设计方法[J].东南大学学报,2008,24(1):74-79. |
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| 作者姓名： | 金伟良 胡琦忠 帅长斌 于群力 鲁征 |
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| 作者单位： | 浙江大学结构工程研究所 杭州310027(金伟良，胡琦忠)，浙江舟山连岛工程指挥部 舟山316000(帅长斌，于群力，鲁征) |
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| 摘 要： | 由于跨海桥梁的环境效应有别于一般桥梁,正常使用极限状态所对应的目标可靠度也必然不同,因此,基于JCSS模式规范建议了目标可靠度指标分别为1.5,2.0和2.3的跨海桥梁基础结构正常使用极限状态三级可靠度水平,并提出了一种可变荷载系数的标定新方法,即通过各类荷载引起的钢筋拉应力对于混凝土裂缝宽度的贡献率不同建立基于钢筋拉应力的正常使用极限状态方程.最后,依据可靠度计算的校准法,结合具体工程进行了基于目标可靠度的可变荷载频遇值系数和准永久值系数的标定,通过设计实践证明所建议的目标可靠度指标值是合理的,采用的标定新方法是可行的.
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| 关 键 词： | 跨海桥梁 目标可靠度 校准法 频遇值 准永久值 基础结构 |
| 修稿时间： | 2007年6月29日 |
Design of foundation structures of sea-crossing bridges on serviceability limit state |
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| Jin Weiliang,Hu Qizhong,Shuai Changbin,Yu Qunli,Lu Zheng.Design of foundation structures of sea-crossing bridges on serviceability limit state[J].Journal of Southeast University(English Edition),2008,24(1):74-79. |
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| Authors: | Jin Weiliang Hu Qizhong Shuai Changbin Yu Qunli Lu Zheng |
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| Abstract: | The target reliability indices of the foundation structures of sea-crossing bridges on the serviceability limit state (SLS) are different from those of common bridges due to their different surroundings.Consequently,three levels of the target reliability indices,which are 1.5,2.0 and 2.3,respectively,for those structures on the SLS are suggested based on the Joint Committee on Structural Safety (JCSS) model code,and a new method of calibrating factors of live loads,which is based on the contribution ratio of tensile stresses of reinforcing bars produced by various loads to the maximum crack width of concrete,is proposed.Finally,the calibration of the reliability-based factors of the frequent value and the quasi-permanent value of live loads is conducted by the Joint Committee (JC) method through an actual design,and the indices are proved to be reasonable and the new method is proved to be feasible. |
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| Keywords: | sea-crossing bridges target reliability JC (Joint Committee) method frequent value quasi-permanent value foundation structures |
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