外包钢加固SRC框架结构地震损伤演化分析
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摘要
基于外包钢加固震损型钢混凝土框架结构在低周往复荷载作用下的破坏性试验,采用材料性能折减的方法考虑震损影响,对外包钢加固损伤的型钢混凝土框架结构进行有限元建模分析,利用改进的双参数地震损伤模型计算其主要构件和整体结构的损伤指数,并利用多项式函数对其构件及整体结构的损伤演化曲线进行拟合,探讨外包钢加固震损型钢混凝土框架结构在低周往复荷载作用下的损伤演化规律。结果表明,通过折减材料性能来模拟预震损的方法是合理的;改进的地震损伤模型能定量计算结构在各个循环阶段的损伤指数;外包钢加固型钢混凝土框架结构的方法能有效降低型钢混凝土框架结构地震损伤程度,与未加固的震损型钢混凝土框架结构相比,外包钢加固震损型钢混凝土框架结构的抗震性能明显增强。
Based on the destructive test of seismically damaged steel reinforced concrete frame structures strengthened by enveloped steel under low cyclic reciprocating loads, considering the effect of seismic damage by adopting the method of material performance reduction, the finite element models of steel reinforced concrete frame structures strengthened by enveloped steel were established and analyzed, and the damage indexes of their main components and the whole structure were calculated by using the improved two-parameter seismic damage model, while the damage evolution curves of the components and the whole structure were fitted by polynomial function to discuss the damage evolution law of steel reinforced concrete frame structures strengthened by enveloped steel under low cyclic reciprocating loads. The results show that it is an effective and feasible method to consider the seismic damage on the mechanical behavior of frame structures by reducing material properties. The improved seismic damage model can quantitatively calculate the damage index of the structure at each cycle. The seismic damage degree of steel reinforced concrete frame structures can be effectively reduced by the method of strengthening by enveloped steel, and compared with the unstrengthened steel reinforced concrete frame structures, the seismic performance of steel reinforced concrete frame structures strengthened by enveloped steel is obviously enhanced.
Based on the destructive test of seismically damaged steel reinforced concrete frame structures strengthened by enveloped steel under low cyclic reciprocating loads, considering the effect of seismic damage by adopting the method of material performance reduction, the finite element models of steel reinforced concrete frame structures strengthened by enveloped steel were established and analyzed, and the damage indexes of their main components and the whole structure were calculated by using the improved two-parameter seismic damage model, while the damage evolution curves of the components and the whole structure were fitted by polynomial function to discuss the damage evolution law of steel reinforced concrete frame structures strengthened by enveloped steel under low cyclic reciprocating loads. The results show that it is an effective and feasible method to consider the seismic damage on the mechanical behavior of frame structures by reducing material properties. The improved seismic damage model can quantitatively calculate the damage index of the structure at each cycle. The seismic damage degree of steel reinforced concrete frame structures can be effectively reduced by the method of strengthening by enveloped steel, and compared with the unstrengthened steel reinforced concrete frame structures, the seismic performance of steel reinforced concrete frame structures strengthened by enveloped steel is obviously enhanced.
引文
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[2] Ruili He,Stephen Grelle,Lesley H Sneed,et al.Rapid repair of a severely damaged RC column having fractured bars using externally boned CFRP[J].Composite Structures,2013,101:225-242.
[3] 翁大根,张超,夏敬德,等.震损框架节点外包钢板加固试验研究[J].土木工程学报,2013,46(4):36-45.
[4] Xu C X,Peng S,Deng J,et al.Study on seismic behavior of encased steel jacket-strengthened earthquake-damaged composite steel-concrete columns[J].Journal of Building Engineering,2018,17:154-166.
[5] Xu C X,Zeng L,Zhou Q,et al.Cyclic performance of concrete-encased composite columns with T-shaped steel sections[J].International Journal of Civil Engineering,2015,13(4):455-467.
[6] Peng S,Xu C X,Lu M X,et al.Experimental research and finite element analysis on seismic behavior of CFRP-strengthened seismic-damaged composite steel-concrete frame columns[J].Engineering Structures,2018,155:50-60.
[7] 许奇琦.外包钢加固震损SRC框架结构抗震性能试验研究[D].荆州:长江大学,2018.
[8] 徐金俊,陈宗平,陈宇良,等.型钢混凝土异形柱抗震性态及其量化指标研究[J].土木工程学报,2014,47(S2):133-138.
[9] Wang B,Zheng S S,Yu F.Seismic damage analysis of SRHSHPC frame beams[J].Applied Mechanics and Materials,2012,166-169:2001-2004.
[10] 郑山锁,侯丕吉,张宏仁,等.SRHSHPC框架结构地震损伤试验研究[J].工程力学,2012,29(7):84-92.
[11] Ding Y,Wu M.,Xu L H,et al.Seismic damage evolution of steel-concrete hybrid space-frame structures[J].Engineering Structures,2016,119:1-12.
[12] 查昕峰.型钢混凝土框架结构地震损伤演化过程研究[D].荆州:长江大学,2017.
[13] 中华人民共和国住房和城乡建设部.混凝土结构设计规范:GB 5000—2010[S].北京:中国建设工业出版社,2010.
[14] 余勋藩.粘钢加固钢筋混凝土柱有限元分析与参数化研究[D].广州:华南理工大学,2015.
[15] 许成祥,邓杰,查昕峰.基于OpenSees的SRC框架结构抗震性能数值模拟及参数分析[J].广西大学学报:自然科学版,2018,43(1):8-15.
[16] 刘杰东.震损钢筋混凝土框架滞回模型研究[D].重庆:重庆大学,2015.
[17] Ghobarah A,Abou-Elfath H,Biddah A.Response-based damage assessment of structures[J].Earthquake Engineering and Structural Dynamics,1999,28(1):9-104.
[18] Park Y J,Ang A H S.Mechanistic seismic damage model for reinforced concrete[J].Journal of Structural Engineering,ASCE,1985,111(4):722-739.
[19] 王东升,冯启民,王国新.考虑低周疲劳寿命的改进Park-Ang地震损伤模型[J].土木工程学报,2004,37(11):41-49.
[20] 许成祥,辛星.型钢混凝土框架结构地震损伤层间位移角限值分析[J].工程抗震与加固改造,2018,40(5):1-6.