密肋复合墙体刚度退化全过程分析
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摘要
密肋复合墙是密肋壁板结构体系的主要抗侧力构件,复合墙在荷载作用下的刚度退化规律是研究密肋结构体系抗震性能的基础性问题之一.由1/2比例密肋复合墙体低周反复荷载试验,得出了复合墙各个特征点刚度和从加荷到破坏全过程的三阶段刚度退化规律,分析了轴压比等因素对复合墙刚度退化的影响,即轴压比越大,剪跨比、外框架截面及配筋、肋柱(梁)数量及配筋越小,刚度退化速度越快,反之则越慢;同时给出了复合墙刚度退化曲线指数表达式和各变形阶段的退化系数表.讨论了改善施工工艺、采用纤维填充材料等延缓复合墙刚度退化速度的方法,为密肋壁板结构体系的工程应用提供了参考.
Multi-ribbed composite wall is the main anti-lateral force component in multi-ribbed slab structure system and the law of its stiffness degradation under load is one of the fundamental problems about seismic performance of multi-ribbed slab structures.Low-cyclic reversed loading tests were conducted on composite wall samples with the ratio of 1∶2,in which the characteristic point stiffness and the law of their stiffness degradation process from load-ing to failure were studied,and the effect of main influencing factors such as axial compression ratio on the wall stiffness degeneration was analyzed.The results show that with the increase of axial compression ratio,the decrease of the shear span ratio,outside frame section and its reinforcement ratio,rib column(beam)quantity,the speed of stiff-ness degradation increased.Otherwise it decreased.The stiffness degradation formula and degradation coefficients in different deformation stages were presented and methods to delay stiffness degradation with construction technique improvement and fibers as stuffing materials were also discussed.The study has provided reference for the application of multi-ribbed slab structure.
Multi-ribbed composite wall is the main anti-lateral force component in multi-ribbed slab structure system and the law of its stiffness degradation under load is one of the fundamental problems about seismic performance of multi-ribbed slab structures.Low-cyclic reversed loading tests were conducted on composite wall samples with the ratio of 1∶2,in which the characteristic point stiffness and the law of their stiffness degradation process from load-ing to failure were studied,and the effect of main influencing factors such as axial compression ratio on the wall stiffness degeneration was analyzed.The results show that with the increase of axial compression ratio,the decrease of the shear span ratio,outside frame section and its reinforcement ratio,rib column(beam)quantity,the speed of stiff-ness degradation increased.Otherwise it decreased.The stiffness degradation formula and degradation coefficients in different deformation stages were presented and methods to delay stiffness degradation with construction technique improvement and fibers as stuffing materials were also discussed.The study has provided reference for the application of multi-ribbed slab structure.
引文
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[9]田鹏,姚谦峰,何明胜,等.钢骨外框密肋复合墙体抗剪性能试验研究[J].建筑结构学报,2008(增):78-82.Tian Peng,Yao Qianfeng,He Mingsheng,et al.Experi-mental research on shear bearing behavior of the steel re-inforced multi-ribbed composite wall[J].Journal of Building Structures,2008(Suppl):78-82(in Chinese).
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[11]胡志远.采用端部约束的配筋砌块砌体剪力墙抗震性能试验研究[D].哈尔滨:哈尔滨工业大学土木工程学院,2006.Hu Zhiyuan.Experimental Study on the Seismic Behav-ior of Reinforced Concrete Masonry Shear Walls with End Restraint[D].Harbin:School of Civil Engineering,Harbin Institute of Technology,2006(in Chinese).
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[2]Thomson E,Bendito A,Fólrez-López J.Simplified model of low cycle fatigue for RC frame[J].Journal of Struc-ture Engineering,1998,124(9):1082-1085.
[3]Holden T,Restrepo J,Mander J B.Seismic performance of precast reinforced and prestressed concrete walls[J].Journal of Structure Engineering,2003,129(3):286-296.
[4]王铁成,陈恒超,郭永亮,等.反复荷载作用下双向受剪框架柱的刚度退化[J].天津大学学报,2005,38(12):1058-1062.Wang Tiecheng,Chen Hengchao,Guo Yongliang,et al.Rigidity degeneration of RC column under two-way horizontal cyclic loads[J].Journal of Tianjin Univer-sity,2005,38(12):1058-1062(in Chinese).
[5]许淑芳,张弢,索跃宁,等.钢筋混凝土空心剪力墙刚度退化研究[J].西安建筑科技大学学报,2007,39(5):605-609.Xu Shufang,Zhang Tao,Suo Yuening,et al.Study of stiffness degeneration on R.C.hollow shear wall[J].Journal of Xi’an University of Architecture and Technol-ogy,2007,39(5):605-609(in Chinese).
[6]Jia Yingjie,Yuan Quan,Yao Qianfeng.Research on shear resistant capacity and reliability of multi-ribbed compos-ite wall in high-rise building[J].Key Engineering Mate rials,2005,302/303:669-675.
[7]Xia Lei,Yao Qianfeng,Chang Peng,et al.Seismic safety evaluation analysis of a new building structure with multi-ribbed composite wall structure[C]//International Conference on Earthquake Engineering:The 1st Anniver-sary of Wenchuan Earthquake.Chengdu,China,2009:325-328.
[8]黄炜.密肋复合墙体抗震性能及设计理论研究[D].西安:西安建筑科技大学土木工程学院,2004.Huang Wei.Research of Seismic Performance and De-sign Theory of Multi-Ribbed Slab Wall[D].Xi’an:School of Civil Engineering,Xi’an University of Archi-tecture and Technology,2004(in Chinese).
[9]田鹏,姚谦峰,何明胜,等.钢骨外框密肋复合墙体抗剪性能试验研究[J].建筑结构学报,2008(增):78-82.Tian Peng,Yao Qianfeng,He Mingsheng,et al.Experi-mental research on shear bearing behavior of the steel re-inforced multi-ribbed composite wall[J].Journal of Building Structures,2008(Suppl):78-82(in Chinese).
[10]傅秀岱,马峰,杨永哲.新型钢筋混凝土复合剪力墙抗震性能试验研究[J].天津大学学报,2000,33(3):336-340.Fu Xiudai,Ma Feng,Yang Yongzhe.Experimental study of lattice composing shear walls on seismic performance[J].Journal of Tianjin University,2000,33(3):336-340(in Chinese).
[11]胡志远.采用端部约束的配筋砌块砌体剪力墙抗震性能试验研究[D].哈尔滨:哈尔滨工业大学土木工程学院,2006.Hu Zhiyuan.Experimental Study on the Seismic Behav-ior of Reinforced Concrete Masonry Shear Walls with End Restraint[D].Harbin:School of Civil Engineering,Harbin Institute of Technology,2006(in Chinese).
[12]郭猛,姚谦峰.框架-密肋复合墙结构新体系研究[J].地震工程与工程振动,2009,29(5):73-78.Guo Meng,Yao Qianfeng.Research on frame-multi-ribbed composite wall structure new system[J].Earth-quake Engineering and Engineering Vibration,2009,29(5):73-78(in Chinese).
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