884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

(1 湖南城建職業(yè)技術(shù)學(xué)院建筑工程系, 湘潭 411101;2 中南林業(yè)科技大學(xué)土木工程學(xué)院, 長(zhǎng)沙 410004)

摘要: 為研究鋼板及鋼板粘貼方式對(duì)小跨高比膠合木梁抗彎性能的影響,對(duì) 3 組 9 根試件進(jìn)行了彎曲試驗(yàn)研究,其中包括未加固、底部鋼板增強(qiáng)及兩側(cè)鋼板增強(qiáng)小跨高比膠合木梁。 試驗(yàn)結(jié)果表明:3 組試件的破壞形式均為順紋剪切脆性破壞,且受彎破壞過程中,受壓區(qū)高度增大,中性軸位置均略有下移;與未加固小跨高比膠合木梁相比,底部鋼板增強(qiáng)對(duì)其極限承載力及變形影響不大,而梁兩側(cè)鋼板增強(qiáng)則能有效提高其極限承載力及變形能力。 結(jié)合理論分析,提出了一種基于應(yīng)變的延性系數(shù)計(jì)算方法,并計(jì)算了 3 組試件的延性系數(shù)及抗彎剛度。 結(jié)果表明:與未加固小跨高比膠合木梁相比,底部鋼板增強(qiáng)對(duì)其延性影響不大,但其抗彎剛度均值提高了 13. 8%;梁兩側(cè)鋼板增強(qiáng)則對(duì)其抗彎剛度影響不大,但其延性系數(shù)均值提高了 19. 3%。

關(guān)鍵詞: 小跨高比膠合木梁; 鋼板增強(qiáng); 彎曲試驗(yàn); 理論分析; 抗彎性能

中圖分類號(hào):TU366. 3 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2022)24-0093-07

DOI:10. 19701 / j. jzjg. 20210164

Experimental study on flexural behavior of steel plate reinforced glulam beams with small span-to-height ratio

ZOU Yanhua1, CHEN Bowang2, LIU Chencheng2

(1 Department of Architecture and Civil Engineering, Hunan Urban Construction College, Xiangtan 411101, China;2 School of Civil Engineering, Central South University of Forestry and Technology, Changsha 410004, China)

Abstract: To study the influence of steel plate and steel plate bonding method on flexural behavior of glulam beams withsmall span-to-height ratio, a total of 3 groups of 9 glulam beams with small span-to-height ratio were tested, includingunreinforced beams, beams reinforced with steel plates at the bottom, beams reinforced with steel plates on both lateralsides. The experimental results show that the failure mode of 3 groups of specimens is shear brittle failure along the grain,and the height of the compression zone increases and the neutral axis slightly moves down during the bending failureprocess; Compared with the unreinforced glulam beams with small span-to-height ratio, the glulam beams reinforced withsteel plates at the bottom has little effect on the ultimate load bearing capacity and the deformation, while the glulam beamsreinforced with steel plates on both lateral sides can effectively improve the ultimate load bearing capacity and thedeformation. Based on the theoretical analysis, a calculation method of ductility coefficient based on strain was proposed,and the ductility coefficient and flexural stiffnesses of 3 groups of specimens were calculated. The results show thatcompared with the unreinforced glulam beams with small span-to-height ratio, the glulam beams reinforced with steel platesat the bottom has little effect on its ductility coefficient, but the mean value of flexural stiffness is increased by 13. 8%,while the glulam beams reinforced with steel plates on both lateral sides has little effect on its flexural stiffness, but themean value of ductility coefficient is increased by 19. 3%.

Keywords:glulam beam with small span-to-height ratio; steel-plate reinforcement; bending test; theoretical analysis;flexural behavior

∗湖南省教育廳科學(xué)研究項(xiàng)目(20C0341),國(guó)家自然科學(xué)基金項(xiàng)目(51578554)。

第一作者:鄒艷花,碩士,講師,一級(jí)建造師,主要從事木結(jié)構(gòu)及組合結(jié)構(gòu)研究,Email:1165097553@ qq. com。

[引用本文] 鄒艷花,陳伯望,劉陳誠(chéng). 鋼板增強(qiáng)小跨高比膠合木梁抗彎性能試驗(yàn)研究[ J]. 建筑結(jié)構(gòu),2022,52(24):93-99. ZOU Yanhua,CHEN Bowang,LIU Chencheng. Experimental study on flexural behavior of steel platereinforced glulam beams with small span-to-height ratio[J]. Building Structure,2022,52(24):93-99.