1.四川大学建筑与环境学院,四川 成都 610065
2.温州大学建筑工程学院,浙江 温州 325035
3.中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江 哈尔滨 150080
4.滨海软土地基防灾减灾技术浙江省工程研究中心,浙江 温州 325035
蒋雨润(1998—),男,硕士研究生。主要从事钢筋混凝土刚构桥抗震性能研究。E-mail:jiangyurun2151@foxmail.com
收稿:2023-01-23,
修回:2023-03-28,
纸质出版:2024-06-25
移动端阅览
蒋雨润,梅竹,刘洋等.地震下RC空心墩弯‑剪数值模型及混合试验验证[J].防灾减灾工程学报,2024,44(03):596-604.
JIANG Yurun,MEI Zhu,LIU Yang,et al.Seismic Bending‑Shear Model for RC Hollow Pier and the Hybrid‑test Validation[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(03):596-604.
蒋雨润,梅竹,刘洋等.地震下RC空心墩弯‑剪数值模型及混合试验验证[J].防灾减灾工程学报,2024,44(03):596-604. DOI: 10.13409/j.cnki.jdpme.20230123001.
JIANG Yurun,MEI Zhu,LIU Yang,et al.Seismic Bending‑Shear Model for RC Hollow Pier and the Hybrid‑test Validation[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(03):596-604. DOI: 10.13409/j.cnki.jdpme.20230123001.
地震作用下钢筋混凝土空心截面中高桥墩多发生弯剪破坏,而其弯剪耦合反应的数值模拟方法尚不完善。针对当前弯剪串联模型中的剪切模型未考虑空心截面特征的问题,提出基于关键参数的剪切模型修正方法,并通过混合试验进行验证。分别从桥墩的剪跨比、混凝土开裂后剪切刚度、等效截面面积、桥墩有效高度与墩身混凝土斜裂缝倾角等参数入手,提出剪切模型关键参数的修正方法;基于修正的开裂剪切强度、开裂剪切位移、剪切极限承载力及其对应的剪切位移与剪切破坏位移,提出适用于空心桥墩剪切性能模拟的三折线型骨架曲线建立方法;通过组合剪切模型与基于纤维单元的弯曲模型,建立空心墩弯剪耦合反应的数值模型;与一座空心高墩桥混合试验结果对比,其桥墩子结构的物理试验结果验证了数值模拟方法。分析表明:通过本文所提数值模拟方法得到的空心桥墩弯剪滞回曲线与真实地震加载路径下的试验曲线匹配良好,能够模拟空心墩在真实地震作用下的弯剪滞回行为。
Seismic action on reinforced concrete hollow-section medium-high piers often results in bending-shear failure. However
studies on numerical simulation for their coupled bending-shear behavior are not yet fully developed. Addressing the issue that current shear models in bending-shear series models do not consider the characteristics of hollow sections
this paper proposes a method for modifying the shear model based on key parameters and verifies it through hybrid testing. By focusing on parameters such as the shear span ratio of the pier
post-cracking shear stiffness of the concrete
equivalent cross-section area
effective height of the pier
and the inclination angle of the concrete diagonal cracks in the pier
this paper proposes a modification method for the key parameters of the shear model. Based on the corrected cracking shear strength
cracking shear displacement
ultimate shear capacity
and its corresponding shear displacement and shear failure displacement
a trilinear skeleton curve establishment method suitable for simulating the shear performance of hollow piers was proposed. By combining the shear model with a bending model based on fiber elements
a numerical model for the coupled bending-shear response of hollow piers was established. Comparison with the hybrid test results of a hollow high-pier bridge validated the numerical simulation method through the physical test results of the pier substructure. Results showed that the bending-shear hysteretic curves provided by the numerical model matched well with the experimental curves under real seismic loading paths. The proposed model can accurately simulate the bending-shear hysteretic behavior of hollow piers under actual earthquake loading conditions.
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