- 摘 要
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(1 蘇州昆侖綠建木結(jié)構科技股份有限公司,蘇州 215105;2 蘇州科技大學江蘇省結(jié)構工程重點實驗室,蘇州 215011)
摘要: 采用自攻螺釘對膠合木梁側(cè)進行橫紋增強,并開展 4 組(含未增強組)膠合木梁側(cè)橫紋承壓試驗.結(jié)果表明,3 種增強方式對膠合木梁側(cè)的橫紋承壓性能均有不同程度提高,單側(cè)通長貫入螺釘組試件最終發(fā)生了局部屈曲破壞,而其他組螺釘變形不明顯;相比于未增強組試件,單側(cè)通長貫入螺釘、雙面貫入螺釘和雙側(cè)斜交螺釘組試件的橫紋承壓荷載分別提高了 25.9%、34.5%和 44.8%;單側(cè)通長貫入螺釘組試件表現(xiàn)出了最高的等效橫紋承壓彈性模量,為 333.6N/ mm2,而其他兩種增強方式的等效橫紋承壓彈性模量略低于未增強組試件.荷載-應變關系表明,自攻螺釘?shù)囊肽苡行Ц纳瞥袎好嫦履静膽兊姆植?采用歐洲標準 EN 408 與 ISO 13910 標準獲得的橫紋承壓強度較為接近,而按照«木結(jié)構試驗方法標準»(GB/ T 50329—2012)獲得的結(jié)果偏于保守;有限元模型總體上能有效預測自攻螺釘增強后的膠合木梁側(cè)橫紋承壓性能.
關鍵詞: 膠合木;自攻螺釘;橫紋承壓;局部變形
中圖分類號:TU366 文獻標志碼:A 文章編號:1002-848X(2022)18-0138-05
DOI:10.19701 / j.jzjg.20210463
Experimental study on compressive bearing capacity of glulam strengthened by self-tappingscrews along glued seam
ZHOU Jinjiang1,YANG Shuhan1,JI Wei1,LING Zhibin2
(1 Suzhou Crownhomes Co. ,Ltd. ,Suzhou 215105,China;2 Jiangsu Key Laboratory of Structure Engineering,Suzhou University of Science and Technology,Suzhou 215011,China)
Abstract: Self-tapping screws were used to strengthen the lateral side of the glulam beam perpendicular to grain,andlateral bearing tests on the glulam beams perpendicular to grain were carried out on four groups of glulam beams includingthe non-strengthened group. The results show that the three strengthening methods can improve the bearing performance ofthe glulam beams perpendicular to grain to different degrees. The specimens in the unilateral long-penetrating screw groupeventually have local buckling failure,while the other groups have no obvious deformation. Compared to non-strengthenedgroup,the compression loading perpendicular to grain of the strengthened groups of specimens can be improved by 25.9%for fully penetrated self-tapping screws,34.5% for double-sides drilled self-tapping screws and 44.8% for cross-drilledself-tapping screws. The specimens with fully penetrated self-tapping screws exhibit the highest average equivalentcompression modulus perpendicular to grain of 333.6 N/ mm2. The other two strengthened groups show slight low equivalentcompression modulus perpendicular to grain compared to the non-strengthened group. The load-strain relationship indicatesthat the use of self-tapping screws can redistribute the compression strain perpendicular to grain under the bearing areaeffectively. The compression intensity of pressure perpendicular to grain calculated according to European standard EN 408is close to that obtained by ISO 13910 standard;however,the result based on the standard for test methods of timberstructures (GB/ T 50329—2012) is conservative. The numerical model is generally able to predict the lateral compressivebehavior of the glulam beams perpendicular to grain strengthened by self-tapping screws.
Keywords:glulam;self-tapping screw;compression perpendicular to grain;local deformation
∗國家自然科學基金青年基金資助項目(51708382),江蘇省自然科學基金項目(BK20221387),江蘇省“六大人才高峰”資助項目(JZ-038).
第一作者:周金將,碩士,工程師,主要從事木結(jié)構設計與施工研究,Email:zhou. jinjiang@ crownhomes. cn.
[引用本文] 周金將,楊舒涵,紀微,等. 自攻螺釘增強膠合木沿膠縫橫紋受壓承載力試驗研究 [J]. 建筑結(jié)構,2022,52(18):138-144,132. ZHOU Jinjiang,YANG Shuhan,JI Wei,et al. Experimental study on compressive bearing capacity ofglulam strengthened by self-tapping screws along glued seam[J]. Building Structure,2022,52(18):138-144,132.
