楼板参数对RC框架结构抗侧屈服机制影响非线性仿真分析
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摘要
采用三维实体退化虚拟层合单元非线性有限元分析法对按现行规范设计的抗震等级三级的两跨六层RC空间框架模型进行仿真分析,结果表明,随水平荷载增大框架梁端负弯矩和正弯矩区域的梁板由"全开间T形截面"整体抗弯分别向"三梁"("T形翼梁"+两"梁间板带")抗弯模式和"T形翼梁抗弯"+两"梁间板膜抗拉"模式转变;楼板参数对RC框架结构抗侧刚度和抗侧承载力影响明显,板顶钢筋对RC框架结构抗侧屈服机制影响最大,板底钢筋其次、楼板厚度次之。
The nonlinear finite element method based on three-dimension solid degenerated virtual laminated element theory was adopted to perform the simulation analysis on a two-bay six-story RC spatial frame model of designed as seismic grade Ⅲ according to current Chinese design code. It is concluded that with the increase of horizontal load, the beam and slab in the region with the negative and positive bending moment at the frame beam end change from the overall bending resistance in "full-bay T-section"to"three-beam" bending mode( "T-wing beam" +two "beam-slab belts") and "T-wing beam bending" +two "beam-slab membrane tension" mode respectively; slab parameters have a significant impact on the lateral stiffness and lateral bearing capacity of RC frame structure. The steel bar at the top of the slab has the greatest impact on the lateral yield mechanism of RC frame structure, more than the impact of the steel bar at the bottom of the slab and the thickness of the slab.
The nonlinear finite element method based on three-dimension solid degenerated virtual laminated element theory was adopted to perform the simulation analysis on a two-bay six-story RC spatial frame model of designed as seismic grade Ⅲ according to current Chinese design code. It is concluded that with the increase of horizontal load, the beam and slab in the region with the negative and positive bending moment at the frame beam end change from the overall bending resistance in "full-bay T-section"to"three-beam" bending mode( "T-wing beam" +two "beam-slab belts") and "T-wing beam bending" +two "beam-slab membrane tension" mode respectively; slab parameters have a significant impact on the lateral stiffness and lateral bearing capacity of RC frame structure. The steel bar at the top of the slab has the greatest impact on the lateral yield mechanism of RC frame structure, more than the impact of the steel bar at the bottom of the slab and the thickness of the slab.
引文
[1] 建筑抗震设计规范:GB 50011—2010[S].北京:中国建筑工业出版社,2010.
[2] CHEUNG P C,PAULAY T,PARK R.Mechanisms of slab contributions in beam-column slab subassemblages[J].Seismic Resistance,1999,123(1):259-289.
[3] 朱宏锋,黄珊珊,张敏.考虑现浇楼板的柱端弯矩增大系数可靠指标分析[J].工程抗震与加固改造,2016,38,(3):73-77,129.
[4] 贾益纲,任文国,吴光宇,等.考虑梁板柱空间协同效应RC框架“强柱弱梁”抗震设计效果非线性仿真分析[J].建筑结构,2017,47(7):43-51.
[5] 徐兴,郭乙木,沈永兴.非线性有限元及程序设计[M].杭州:浙江大学出版社,1993.
[6] 陈惠发,萨里普 A F.混凝土和土的本构方程[M].余天庆,王勋文,刘西拉,等译.北京:中国建筑工业出版社,2004.
[7] 王勖成,邵敏.有限元法基本原理与数值方法[M].北京:清华大学出版社,1995.
[8] BERGAN P G,HOLAND I,SOREIDE T H.Use of current stiffness parameter in solution of nonlinear problems,energy methods in finite element analysis[M].Hoboken:John Wiley & Sons,1979:265-282.
[9] 吴光宇,汪劲丰,项贻强,等.钢筋混凝土箱形梁极限承载力的计算[J].浙江大学学报(工学版),2007,41(1):161-165.
[10] 贾益纲,吴光宇,杨春白雪,等.考虑轴压比影响RC框架-剪力墙结构侧移刚度退化及楼层剪力重分配性能仿真分析[J].建筑结构,2016,46(24):50-55.
[11] 吴光宇,万宝,贾益纲,等.RC框架结构梁板柱空间协同工作效应非线性仿真分析[J].南昌大学学报(理科版),2016,40(5):445-454.
[2] CHEUNG P C,PAULAY T,PARK R.Mechanisms of slab contributions in beam-column slab subassemblages[J].Seismic Resistance,1999,123(1):259-289.
[3] 朱宏锋,黄珊珊,张敏.考虑现浇楼板的柱端弯矩增大系数可靠指标分析[J].工程抗震与加固改造,2016,38,(3):73-77,129.
[4] 贾益纲,任文国,吴光宇,等.考虑梁板柱空间协同效应RC框架“强柱弱梁”抗震设计效果非线性仿真分析[J].建筑结构,2017,47(7):43-51.
[5] 徐兴,郭乙木,沈永兴.非线性有限元及程序设计[M].杭州:浙江大学出版社,1993.
[6] 陈惠发,萨里普 A F.混凝土和土的本构方程[M].余天庆,王勋文,刘西拉,等译.北京:中国建筑工业出版社,2004.
[7] 王勖成,邵敏.有限元法基本原理与数值方法[M].北京:清华大学出版社,1995.
[8] BERGAN P G,HOLAND I,SOREIDE T H.Use of current stiffness parameter in solution of nonlinear problems,energy methods in finite element analysis[M].Hoboken:John Wiley & Sons,1979:265-282.
[9] 吴光宇,汪劲丰,项贻强,等.钢筋混凝土箱形梁极限承载力的计算[J].浙江大学学报(工学版),2007,41(1):161-165.
[10] 贾益纲,吴光宇,杨春白雪,等.考虑轴压比影响RC框架-剪力墙结构侧移刚度退化及楼层剪力重分配性能仿真分析[J].建筑结构,2016,46(24):50-55.
[11] 吴光宇,万宝,贾益纲,等.RC框架结构梁板柱空间协同工作效应非线性仿真分析[J].南昌大学学报(理科版),2016,40(5):445-454.