构造与设计参数对消能楼梯间减震性能的影响分析
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摘要
为研究不同楼梯支座构造及阻尼填充墙厚度、阻尼填充墙砌体抗压强度、阻尼层剪切强度、减震支座剪切模量等设计参数对消能楼梯间减震性能的影响,采用ABAQUS有限元软件对4种不同楼梯支座构造、15个不同设计参数共19个消能楼梯间分析模型进行数值仿真分析。结果表明:不同楼梯支座构造中,设置减震支座可提供一定的水平、竖向刚度,改善楼梯间的屈服情况,减小梯板的竖向翘起位移,有利于地震中保持楼梯的稳定性;不同减震支座设置方案均可实现以减震支座的剪切变形消除梯板支撑效应、发挥良好耗能效果的减震目标;消能楼梯间构造简单、性能稳定,常用设计参数下均表现出良好的减震性能;阻尼填充墙厚度的增加,一定程度上增大消能楼梯间的刚度、水平承载能力;阻尼填充墙砌体抗压强度的变化对楼梯间减震性能影响较小;阻尼层剪切强度的增大将减小楼梯间的屈服位移,增大阻尼填充墙的压应力,建议采用剪切强度低的阻尼层材料;减震支座的剪切模量越大,梯板竖向翘起位移越小,减震支座剪切模量宜取0.5 MPa以上。
In order to study the effects of stair support construction and design parameters on the energy dissipating performance of damped staircase,19 analysis models including 4 different stair support construction and 15 different design parameters were analysed by ABAQUS. The results showed that damped support can provide certain horizontal and vertical stiffness,which extended yield displacement of the staircase and decreased the vertical displacement of stair. Different damped support settings scheme can eliminate brace effect produced by stair and exert a good energy dissipation effect. The construction of damped staircase is simple and shows a good energy dissipating performance under regular design parameters. With the increase of the thickness of the damped infill wall,the stiffness and horizontal bearing capacity of the damped increased in a certain extent. The compressive strength of the damped infill wall has little influence on the energy dissipating performance of the staircase. The increase of damping layer shear strength will reduce the yield displacement of the staircase and increase stress of the damped infill wall. The bigger shear modulus of damped bearing is,the smaller vertical displacement of stair is. It is advised that shear modulus of damped bear should be 0. 5 MPa above.
In order to study the effects of stair support construction and design parameters on the energy dissipating performance of damped staircase,19 analysis models including 4 different stair support construction and 15 different design parameters were analysed by ABAQUS. The results showed that damped support can provide certain horizontal and vertical stiffness,which extended yield displacement of the staircase and decreased the vertical displacement of stair. Different damped support settings scheme can eliminate brace effect produced by stair and exert a good energy dissipation effect. The construction of damped staircase is simple and shows a good energy dissipating performance under regular design parameters. With the increase of the thickness of the damped infill wall,the stiffness and horizontal bearing capacity of the damped increased in a certain extent. The compressive strength of the damped infill wall has little influence on the energy dissipating performance of the staircase. The increase of damping layer shear strength will reduce the yield displacement of the staircase and increase stress of the damped infill wall. The bigger shear modulus of damped bearing is,the smaller vertical displacement of stair is. It is advised that shear modulus of damped bear should be 0. 5 MPa above.
引文
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[2]邓雪松,罗德章,周云,等.消能减震楼梯间减震性能有限元分析[J].工程抗震与加固改造,2017,39(1):55-63,108.DENG Xuesong,LUO Dezhang,ZHOU Yun,et al.Finite element analysis of energy dissipating performance of damped staircase[J].Earthquake Resistant Engineering and Retrofitting,2017,39(1):55-63,108.(in Chinese)
[3]罗德章.消能楼梯间减震性能研究[D].广州:广州大学,2017.LUO Dezhang.Research on energy dissipating performance of damped staircase[D].Guangzhou:Guangzhou University,2017.(in Chinese)
[4]GB 50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB 50011-2010 Code for Seismic Design of Buildings[S].Beijing:China Architecture&Building Press,2010.(in Chinese)
[5]陆新征,蒋庆,缪志伟,等.建筑抗震弹塑性分析[M].北京:中国建筑工业出版社,2015.LU Xinzheng,JIANG Qing,MIU Zhiwei,et al.Elasto-plastic analysis of buildings against earthquake[M].Beijing:China Architecture&Building Press,2015.(in Chinese)
[6]朱伯龙.砌体结构设计原理[M].上海:同济大学出版社,1998.ZHU Bolong.Design pricinple of masonry structures[M].Shanghai:Tongji University Press,1998.(in Chinese)
[7]石亦平,周玉蓉.ABAQUS有限元分析实例详解[M].北京:机械工业出版社,2006.SHI Yiping,ZHOU Yurong.ABAQUS FEA example explanation[M].Beijing:China Machine Press,2006.(in Chinese)
[8]林松伟.新型消能减震楼梯的分析与研究[D].广州:广州大学,2014.LIN Songwei.Analysis and research on a new type of energy dissipation buffering stair[D].Guangzhou:Guangzhou University,2014.(in Chinese)
[9]庄茁,由小川,廖剑晖,等.基于ABAQUS的有限元分析和应用[M].北京:清华大学出版社,2009.ZHUANG Zhuo,YOU Xiaochuan,LIAO Jianhui,et al.Finite element analysis and application based on ABAQUS[M].Beijing:Tsinghua University Press,2009.(in Chinese)
[10]周云,郭阳照,杨冠男,等.阻尼砌体填充墙框架结构抗震性能试验研究[J].建筑结构学报,2013,34(7):89-96.ZHOU Yun,GUO Yangzhao,YANG Guannan,et al.Experimental study on seismic behavior of fame structure with damped infill wall[J].Journal of Building Structures,2013,34(7):89-96.(in Chinese)