摘要
本文通过在梁端纵筋设置局部无粘结段的方法用以改善框架梁抗震性能。设计并进行了1个普通钢筋混凝土梁试件和3个局部无粘结钢筋混凝土梁试件的低周反复荷载试验,其中局部无粘结段钢筋外套管材材质、无粘结段长度和设置无粘结段的钢筋数量是主要设计参数。对比分析了4个梁试件的破坏特征、滞回曲线、骨架曲线、承载力及延性以及耗能能力。试验结果表明,梁铰主要形成于梁端和无粘结钢筋段端部区域,局部无粘结混凝土梁峰值过后承载力退化趋势不明显,且变形能力提高约6%~30%。试件耗能能力最大可提高约12%,且局部无粘结混凝土梁的总体耗能能力受钢筋外套管材材质、数量和几何长度影响,应在设计中予以考虑。
The seismic performance of the RC frame beam could be improved by the method of arranging the partially unbonded part on the longitudinal steel bars.Four specimens including one reinforced concrete beam and three partially unbonded concrete beams were tested through the low cyclic reversed loading test.The main parameters of the specimen were the material of the outer steel tubes length and the number of the unbonded segments.The failure mode,hysteretic curves,skeleton curves,bearing capacity and ductility coefficient,stiffness degradation and the energy dissipation capacity were studied based on the test.The test results showed that the plastic hinge were mainly formed both at the beam end and the unbonded segment.The strength degradation of the partially unbonded beam was not obvious after the peak value state,and the deformation capacity was improved by 6~30 percent,respectively.The overall energy dissipation capacity could be improved by about 12 percent and the influence of the material property,number and length of the outer steel tubes on the seismic performance of the beams should be paid attention in the actural design process.
作者
刘春阳
郭长群
李飞
李振宝
杨昌昆
赵兴权
LIU Chunyang;GUO Changqun;LI Fei;LI Zhenbao;YANG Changkun;ZHAO Xingquan(Department of Civil Engineering of Shandong Jianzhu University,Jinan Shandong 250101,China;Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit Beijing University of Technology,Beijing 100124,China)
出处
《结构工程师》
北大核心
2018年第5期122-128,共7页
Structural Engineers
基金
山东省自然科学基金(ZR2015EQ017
ZR2018MEE044)
关键词
混凝土梁
局部无粘结
外套管材
抗震性能
拟静力试验
concrete beam
partially unbonded
outer steel tubes
seismic performance
quasi-static test
