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鋼網格盒式結構空腹桁架與柱相交節點抗震性能試驗研究*
孔丹丹,張宣,李少鋒,趙欣
摘 要

(河北工業大學土木與交通學院, 天津 300401)

[摘要]為了研究裝配整體式鋼網格盒式結構體系空腹桁架與柱相交節點的抗震性能,設計制作了5種不同構造參數的鋼網格盒式結構空腹桁架與H型鋼柱強軸相交節點試件,進行了低周反復荷載試驗,分析和研究了節點的破壞過程、承載能力、滯回曲線、骨架曲線、延性和耗能性能等指標。試驗結果表明:在桁架與柱連接空腹處設置連續槽形焊縫和加勁板的構造措施可使塑性鉸外移,避免了桁架根部焊縫的脆性破壞;對于焊有加勁板的試件,不同加勁板尺寸對試件的抗震性能有一定程度的影響。焊有加勁板試件在應力集中部位易形成裂縫,而利用連續槽形焊縫替代加勁板補強節點則可以緩解試件應力集中;這兩種構造形式均由于腹板受壓而出現一定程度的腹板局部屈曲現象。為盒式結構節點的實際應用提供了一定的理論支持。

[關鍵詞]空腹桁架與柱相交節點; 盒式結構; 抗震性能

中圖分類號:TU391, TU393-3文獻標識碼:A文章編號:1002-848X(2019)04-0091-07

 

Experimental study on seismic behavior of intersection joints of vierendeel truss with column in steel grid cassette structure

Kong Dandan, Zhang Xuan, Li Shaofeng, Zhao Xin

(School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, China)

Abstract:In order to study the seismic performance of intersection joints of vierendeel truss with column in integral assembly steel grid cassette structure, five kinds of steel grid box structure hollow truss and H\|section column strong axis intersection node test piece with different structural parameters were designed and made, and  the low-cyclic reversed loading test was carried out. The damage process, bearing capacity, hysteresis curve, skeleton curve, ductility and energy dissipation performance of the joint were analyzed and studied. The test results show that at the vierendeel of the joint between the truss and column, both adopting continuous groove weld and installing stiffening plate are able to move plastic hinge outward, avoiding the brittle failure of the truss root weld.  For welding specimens with stiffening plates, the  size of the stiffening plate has a certain degree of influence on the seismic performance of the specimens. Welding specimens with stiffening plates are prone to cracks in the stress concentration area, and the use of continuous groove welds instead of stiffening plates can alleviate the stress concentration of the specimens; both of these configurations have a certain degree of local buckling of the web due to compression of the web. The research provides some theoretical support for the practical application of the cassette structural joint.

Keywords:intersection joint of vierendeel truss with column; cassette structure; seismic performance

 

*河北省自然科學基金資助項目(E2014202173)。

 

作者簡介:孔丹丹,博士,副教授,碩士生導師,Email:[email protected]

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