| 近场地震下简支梁桥搭接长度需求分析 |
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| 引用本文： | (岳伟勤,师新虎,张来福,苏小波,贾宏宇.近场地震下简支梁桥搭接长度需求分析[J].世界地震工程,2023,39(2):125-137. |
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| 作者姓名： | (岳伟勤 师新虎 张来福 苏小波 贾宏宇 |
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| 作者单位： | 1. 中铁长江交通设计集团有限公司,重庆 401121; 2. 四川公路工程咨询监理有限公司,成都 610041; 3. 西南交通大学 土木工程学院,成都 610031 |
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| 基金项目： | 国家自然科学基金面上项目(52178169)； |
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| 摘 要： | 随着交通网络向偏远地区辐射，桥梁结构会不可避免的出现靠近断层的情况，受到近断层地震动的影响显著。为了研究近场地震作用下简支梁桥的搭接长度需求，基于ANSYS平台建立了简支梁桥的弹塑性分析模型。通过动力响应分析、弹塑性分析和抗剪能力分析，探讨了近场地震动的脉冲效应对简支梁桥搭接长度的影响。研究表明：近场地震动的脉冲效应放大了结构的地震响应，脉冲型地震和非脉冲地震作用时的最大墩梁相对位移分别为115.1 cm和41.5 cm;两类地震作用时的最大剪力分别为1 892.5 kN和1737.8 kN,最大剪力剪切强度比为0.82;当PGA≥0.4 g时，脉冲型地震作用下桥墩底部塑性铰区的最大转角超过极限转角，桥墩发生破坏，而非脉冲型地震PGA=1.0 g时的塑性铰转角小于极限转角；当PGA=1.0 g时，塑性铰破坏前墩梁相对位移为37 cm,占规范搭接长度的41.8%,近场地震作用下简支梁桥的搭接长度需求满足规范要求。
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| 关 键 词： | 近场地震动 塑性铰 搭接长度 脉冲特性 弹塑性分析 |
Demand analysis of supported length of simply supported beam bridge under near-field earthquake |
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| (YUE Weiqin ,SHI Xinhu,ZHANG Laifu,SU Xiaobo,JIA Hongyu.Demand analysis of supported length of simply supported beam bridge under near-field earthquake[J].World Information On Earthquake Engineering,2023,39(2):125-137. |
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| Authors: | (YUE Weiqin SHI Xinhu ZHANG Laifu SU Xiaobo JIA Hongyu |
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| Affiliation: | 1. China Railway Changjiang Traffic Design Group Co., Ltd., Chongqing 401121, China; 2. Sichuan Highway Engineering )/((Consult Supervision Company Ltd, Chengdu 610041, China; 3. School of Civil Engineering,Southwest Jiaotong University, Chengdu 610031, China |
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| Abstract: | As the traffic network radiates to remote areas, the bridge will inevitably be close to the fault, which is significantly affected by the near-field ground motion. In order to study the supported length requirement of simply supported beam bridge under near-field earthquake, an elastoplastic analysis model of simply supported beam bridge is established based on ANSYS platform. Through dynamic response analysis, elastic-plastic analysis and shear capacity analysis, the impact of pulse effect of near-field vibration on the supported length of simply supported beam bridge is discussed. Research shows that: The pulse effect of near-field vibration amplifies the seismic response of the structure. The maximum relative displacement of pier beam under pulse earthquake and non-pulse earthquake is 115.1 cm and 41.5 cm respectively. The maximum shear force under two types of earthquake is 1 892.5 kN and 1 737.8 kN respectively, and the maximum shear strength ratio is 0.82. When PGA≥0.4 g, the maximum rotation angle of the plastic hinge area at the bottom of the pier under the pulse earthquake exceeds the limit rotation angle, and the pier is damaged, while the plastic hinge rotation angle under the non-pulse earthquake PGA=1.0 g is less than the limit rotation angle. When PGA=1.0 g, the relative displacement of pier beam before plastic hinge failure is 37 cm, accounting for 41.8% of the specification supported length. The supported length of simply supported beam bridge under near-field earthquake meets the specification requirements. |
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| Keywords: | near-fault earthquake plastic hinge supported length pulse characteristics elastoplastic analysis |
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