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工程科学与技术:2021,53(6):81-92
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震损砌体古塔围箍加固后的滞回特性分析
(1.西安理工大学 土木建筑工程学院,陕西 西安 710048;2.西安热工研究院有限公司,陕西 西安 710054)
Analysis of Hysteresis Properties of Seismic Damaged Masonry Pagoda Restraint by Rigid Hoops
(1.School of Civil. Eng. and Architecture, Xi’an Univ. of Technol., Xi’an 710048, China;2.Xi’an Thermal Power Research Inst. Co., Ltd., Xi’an 710054, China)
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投稿时间:2020-11-19    修订日期:2021-02-03
中文摘要: 震损后的古塔结构整体性差,再次受到地震作用时易发生严重破坏,甚至倒塌。采用刚性围箍对古塔砌体进行约束增强,可改善古塔砌体的受力性能。为研究受损古塔砌体采用围箍约束后的抗震性能,设计制作3个古塔子结构模型试件进行拟静力试验,观察了受损试件及其采用角钢围箍约束后的破坏现象,测试约束后试件的荷载?位移曲线;建立数值模型,计算模型试件的应力、应变及变形;通过与试验结果对比,分析约束后古塔砌体的破坏模式、承载力、刚度及延性较震损前的变化关系等。结果表明:刚性围箍装置可有效限制塔体试件在水平荷载作用下的变形和斜裂缝的扩展,提高古塔结构抵抗地震作用的能力,延缓结构刚度退化;骨架曲线的数值计算结果与试验结果一致,角钢围箍与塔体结构的协同工作性能较好,加固效果显著。研究结果可为砖石古塔抗震加固提供参考。
Abstract:Due to the weak integrity of the damaged masonry pagodas, it is easily to be destroyed heavily for the pagodas affected by earthquake again, even are collapsed. Using rigid hoops to restrain and strengthen the masonry can improve the mechanical properties of ancient masonry pagodas. To study the seismic performance of damaged masonry pagoda reinforced with rigid hoop, three sub-structure models of the masonry pagoda were designed and constructed, and the pseudo-static tests were carried out. The failure phenomena of seismic damaged specimens and the specimens restrained by angle steel hoops were observed, and the load-displacement curves of the restrained specimens were obtained. The numerical models were established to calculate the stress, strain and deformation of the ancient pagoda substructure, and the seismic performance indexes of the reinforced ancient pagoda substructure were obtained through comparative analysis with the test results. As results, the hoop device can effectively confine the horizontal deformation and the expansion of diagonal cracks, improve the ability of the ancient pagoda substructure to resist horizontal deformation, and delay the degradation of structural rigidity. The numerical model can reflect well to the damage of the structure and reinforcement device the characteristics of collaborative work with the structure of the pagoda, and the research results can provide references for the seismic reinforcement of ancient masonry pagoda.
文章编号:202001007     中图分类号:TU365    文献标志码:
基金项目:国家自然科学基金项目(51778527)
作者简介:第一作者:卢俊龙(1978-),男,教授,博士.研究方向:工程结构抗震.E-mail:lujunlong@sohu.com
引用文本:
卢俊龙,邢威威,王振山,孙冲.震损砌体古塔围箍加固后的滞回特性分析[J].工程科学与技术,2021,53(6):81-92.
LU Junlong,XING Weiwei,WANG Zhenshan,SUN Chong.Analysis of Hysteresis Properties of Seismic Damaged Masonry Pagoda Restraint by Rigid Hoops[J].Advanced Engineering Sciences,2021,53(6):81-92.