摘要
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 be-havior are not yet fully developed.Addressing the issue that current shear models in bending-shear se-ries 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 di-agonal 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.
作者
蒋雨润
梅竹
刘洋
陈江
熊峰
JIANG Yurun;MEI Zhu;LIU Yang;CHEN Jiang;XIONG Feng(College of Architecture and Environment,Sichuan University,Chengdu 610065,China;College of Civil Engineering and Architecture,Wenzhou University,Wenzhou 325035,China;Key Laboratory of Vibration Earthquake Engineering and Engineering Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Zhejiang Engineering Research Center of Disaster Prevention and Mitigation for Coastal Soft Soil Foundation,Wenzhou 325035,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2024年第3期596-604,共9页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金青年基金项目(51908384)
国家重点研发计划项目(2021YFB2600500)
中国博士后科学基金面上资助项目(2019M663500,2020M673223)
中国地震局工程力学研究所基本业务费专项项目(2019D18)资助。
作者简介
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。
