预应力螺杆加固预制多孔板技术与数值分析
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摘要
针对地震作用下采用预制板楼面的砌体结构房屋容易出现预制板脱离支座而坠落的破坏特征,提出了采用预应力螺杆对预制板楼面进行整体性加固的技术措施。通过有限元对比分析,验证了该技术的有效性,探讨了螺杆长度、预应力大小对加固效果的影响。研究结果表明,采用预应力螺杆将楼面预制板端部对拉,能够有效地增加预制板楼面的整体性,显著地减小楼板在地震作用下的水平位移,是一种有效的防止预制板脱离支座坠落的加固方法;螺杆长度以及预应力大小对加固效果的影响不明显。该技术还可作为新建房屋预制板的抗震构造措施,为预制板的可持续发展提供了解决思路。
In previous earthquakes, a great number of masonry buildings were destroyed due to sliping-off from supports and collapse of precast hollow-core slabs(PHCS for short in the remaining of this paper). Based on this failure characteristic of PHCS, a strengthening strategy of using prestressed tendons for improving the integrity of the floor system is developed and presented in this paper. By finite element comparison analysis, the effectiveness of this technique is validated, and the influence of the screw length and prestress of the tendons on the strengthening effect were discussed. The results showed that, the integrity of the floor system is effectively improved by the this technique, and the horizontal displacement of the floor is significantly reduced during earthquakes. It is an effective strengthening method to prevent the PHCS from falling off the support. The influence of the length and prestress of the tendons on the strengthening effect was not significant. This technique can also be used as a seismic structural measure for the newly built houses with precast slabs, which provides a solution for the sustainable development of precast slabs.
In previous earthquakes, a great number of masonry buildings were destroyed due to sliping-off from supports and collapse of precast hollow-core slabs(PHCS for short in the remaining of this paper). Based on this failure characteristic of PHCS, a strengthening strategy of using prestressed tendons for improving the integrity of the floor system is developed and presented in this paper. By finite element comparison analysis, the effectiveness of this technique is validated, and the influence of the screw length and prestress of the tendons on the strengthening effect were discussed. The results showed that, the integrity of the floor system is effectively improved by the this technique, and the horizontal displacement of the floor is significantly reduced during earthquakes. It is an effective strengthening method to prevent the PHCS from falling off the support. The influence of the length and prestress of the tendons on the strengthening effect was not significant. This technique can also be used as a seismic structural measure for the newly built houses with precast slabs, which provides a solution for the sustainable development of precast slabs.
引文
[1]杨文忠.唐山大地震与建筑抗震[M].成都:西南交通大学出版社,2003.
[2]蒋璐.体外预应力、碗钉法加固砌体结构试验研究及理论分析[D].上海:同济大学,2013.
[3]Ma R L,JIANG L,HE M J,et al.Experimental investigations on masonry structures using external prestressing techniques for improving seismic performance[J].Engineering structures,elsevier2012,42:297-307.
[4]徐有邻.由地震引发对预制预应力圆孔板的思考[J].建筑结构,2008,38(7):7-9.
[5]JUAN C,ROBERT P.Test on specials reinforcement for the end support of hollow-core slabs[J].PCI Journal,1994:401-411.
[6]ELGABBASA F,EL-GHANDOURA A A,ABDELRAHMANA AA,et al.Different CFRP strengthening techniques for prestressed hollow core concrete slabs:Experimental study and analytical investigation[J].Composite structures,2010,92(2):401-411.
[7]中华人民共和国建设部.预应力混凝土空心板:93G436[S].北京:中国建筑工业出版社,1993.
[2]蒋璐.体外预应力、碗钉法加固砌体结构试验研究及理论分析[D].上海:同济大学,2013.
[3]Ma R L,JIANG L,HE M J,et al.Experimental investigations on masonry structures using external prestressing techniques for improving seismic performance[J].Engineering structures,elsevier2012,42:297-307.
[4]徐有邻.由地震引发对预制预应力圆孔板的思考[J].建筑结构,2008,38(7):7-9.
[5]JUAN C,ROBERT P.Test on specials reinforcement for the end support of hollow-core slabs[J].PCI Journal,1994:401-411.
[6]ELGABBASA F,EL-GHANDOURA A A,ABDELRAHMANA AA,et al.Different CFRP strengthening techniques for prestressed hollow core concrete slabs:Experimental study and analytical investigation[J].Composite structures,2010,92(2):401-411.
[7]中华人民共和国建设部.预应力混凝土空心板:93G436[S].北京:中国建筑工业出版社,1993.