钢筋桁架加强部件承载性能研究
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摘要
组合墙体在楼层连接处的构造不连续是限制该体系在多层房屋应用的关键因素,为提高上下层墙段间协同工作能力,符合"强连接、弱构件"的设计要求,提出一种楼层连接处外构造加强方法,并对加强部件进行有限元分析及试验研究,结果表明:HJZ、HJB、HJZB0系列试件耗能能力较强,在所考察的轴压范围内,承载力及耗能能力受轴压影响很小,且随轴压增大耗能能力有所提高;竖向荷载作用下,试验中所有试件承载力均有下降段,为延性破坏;试件发生破坏的为角部4根立柱的整体失稳,应变片读数超过屈服应变;加强部件应用于层间构造加强,可明显提高楼层连接处抗往复荷载破坏的能力。
The structural discontinuity of composite wall at the floor connection is the key factor that restricts the application of the system in multi-storey buildings. In order to improve the cooperative working ability between the upper and lower wall sections,and to meet the design requirements of"strong connection and weak component",a strengthening method of external structure at the floor connection was proposed,and the strengthening components were analyzed and tested by finite element method. The experimental results showed that: HJZ,HJB,HJZB0 series of specimens had strong energy dissipation capacity. Within the range of axial compression investigated,the bearing capacity and energy dissipation capacity were little affected by axial compression,and the energy dissipation capacity increased with the increase of axial compression. Under vertical load,the bearing capacity of all the specimens in the test had a descending section,which was ductile failure; the failure of the specimens was the overall instability of the four columns at the corner,and the strain gauge reading exceeded the yield strain; when the reinforcement components were used to strengthen the interlayer structure,the resistance to reciprocating damage of the floor connection could be significantly improved.
The structural discontinuity of composite wall at the floor connection is the key factor that restricts the application of the system in multi-storey buildings. In order to improve the cooperative working ability between the upper and lower wall sections,and to meet the design requirements of"strong connection and weak component",a strengthening method of external structure at the floor connection was proposed,and the strengthening components were analyzed and tested by finite element method. The experimental results showed that: HJZ,HJB,HJZB0 series of specimens had strong energy dissipation capacity. Within the range of axial compression investigated,the bearing capacity and energy dissipation capacity were little affected by axial compression,and the energy dissipation capacity increased with the increase of axial compression. Under vertical load,the bearing capacity of all the specimens in the test had a descending section,which was ductile failure; the failure of the specimens was the overall instability of the four columns at the corner,and the strain gauge reading exceeded the yield strain; when the reinforcement components were used to strengthen the interlayer structure,the resistance to reciprocating damage of the floor connection could be significantly improved.
引文
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[3]黄智光,苏明周,何保康,等.冷弯薄壁型钢三层房屋振动台试验研究[J].土木工程学报,2011,44(2):72-81.
[4]李元齐,刘飞,沈祖炎,等.高强超薄壁冷弯型钢低层住宅足尺模型振动台试验[J].建筑结构学报,2013,34(1):36-43.
[5]沈祖炎,刘飞,李元齐,等.高强超薄壁冷弯型钢低层住宅抗震设计方法[J].建筑结构学报,2013,34(1):44-51.
[6]周绪红,管宇,石宇.多层冷弯薄壁型钢结构住宅抗震性能分析[J].建筑钢结构进展,2017,19(6):11-15.
[7]王秀丽,褚云朋,姚勇,等.超薄壁冷弯型钢C型墙架柱-楼层梁连接抗震性能试验研究[J].土木工程学报,2015,48(7):51-59.
[8]陈明,马晓飞,赵根田.冷弯型钢组合截面T形节点抗震性能研究[J].工程力学,2015,32(1):184-191.
[9]李元齐,帅逸群,沈祖炎,等.冷弯薄壁型钢自攻螺钉连接抗拉性能试验研究[J].建筑结构学报,2015,36(12):143-151.
[10]赵莹,吴学韬.冷弯薄壁C型钢梁柱节点静力性能研究[J].钢结构,2018,33(10):19-23.
[11]褚云朋,姚勇,古松,等.冷弯薄壁型钢结构房屋外墙结构体系:ZL201610876109. 0[P].2018-08-14.
[12]褚云朋,姚勇,陈俊颖,等.冷弯薄壁型钢房屋层间加强部件:ZL201610876110. 3[P].2018-07-06.
[13]中华人民共和国住房和城乡建设部.低层冷弯薄壁型钢房屋建筑技术规程:JGJ 227—2011[S].北京:中国建筑工业出版社,2011.