腹板并合双肢冷弯薄壁Σ型钢压弯构件畸变性能试验研究

何子奇; 杨光; 周绪红; 彭赛清

doi:10.6052/j.issn.1000-4750.2021.08.0626

腹板并合双肢冷弯薄壁Σ型钢压弯构件畸变性能试验研究

doi: 10.6052/j.issn.1000-4750.2021.08.0626

何子奇^1, ,,
杨光^{1, 2,},
周绪红^1,,
彭赛清^1,

1.
重庆大学土木工程学院，重庆 400045
2.
中国电力工程顾问集团西南电力设计院有限公司，成都 610021

基金项目: 国家自然科学基金项目(51508051，51890902)

详细信息

作者简介:
杨　光(1995−)，男，重庆巴南人，工学硕士，主要从事新能源发电站设计研究(E-mail: 645802849@qq.com)

周绪红(1956−)，男，湖南南县人，教授，工学博士，中国工程院院士，主要从事钢结构、组合结构等研究(E-mail: zhouxuhong@126.com)

彭赛清(1998−)，男，江西鹰潭人，工学硕士，主要从事冷弯型钢结构研究(E-mail: 2291430303@qq.com)

通讯作者:
何子奇(1980−)，男，甘肃定西人，副教授，工学博士，主要从事钢结构和原竹结构研究(E-mail: heziqi@cqu.edu.cn)

中图分类号: TU392.1；TU317+.1
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- 被引次数: 0
出版历程
- 收稿日期: 2021-08-11
- 修回日期: 2022-03-10
- 网络出版日期: 2022-10-08
- 刊出日期: 2023-02-01

EXPERIMENTAL RESEARCH ON DISTORTIONAL BEHAVIOR OF COLD-FORMED THIN-WALLED Σ-SHAPED STEEL BUILT-UP SECTIONS UNDER ECCENTIRC COMPRESSION

HE Zi-qi^{1
, ,},
YANG Guang^{1, 2
,},
ZHOU Xu-hong^1
,,
PENG Sai-qing^1
,

1.
School of Civil Engineering, Chongqing University, Chongqing 400045, China
2.
Southwest Electric Power Design Institute Co., LTD. of China Power Engineering Consulting Group, Chengdu 610021, China

摘要

摘要: 为研究腹板并合双肢冷弯薄壁Σ型钢拼合钢柱的畸变屈曲性能及其相关作用，并评估现行各国规范计算方法适用性，设计制作了22根构件进行压弯试验。以Σ型加劲、腹板孔位、偏心荷载作用位置、柱长等为主要参数，考察其对试件屈曲行为、破坏特征和极限承载能力的影响。结果表明：试验主要发生畸变屈曲或畸变-整体、畸变-局部相关屈曲，Σ型加劲有效地防止了腹板局部屈曲；腹板开孔不会影响屈曲模式的改变；关于强轴和弱轴的偏压位置及偏心距离对试件畸变屈曲行为有显著影响。采用中美技术标准包括中国规范GB 50018−2002、JGJ/T 421−2018以及北美规范NAS 100−2016计算的承载力结果与试验结果进行了对比分析，结果表明：荷载绕强轴偏心作用时，中美规范计算结果均偏于安全；荷载绕弱轴偏心作用时，GB 50018−2002和NAS 100−2016计算结果偏于安全，而JGJ/T 421−2018计算值较为保守，试验与其比值约为1.64，该文建议腹板双肢并合截面整体协同工作下绕弱轴稳定承载力可按全截面计算。
- 冷弯薄壁型钢 /
- Σ型加劲 /
- 拼合构件 /
- 压弯作用 /
- 畸变屈曲
Abstract: To study the distortional buckling and interactive behavior of cold-formed steel composite sections with Σ-shaped web channels, and evaluate the applicability of current Chinese and North American codes, 22 members were designed and fabricated for compression-bending test. The main parameters including Σ-shaped stiffener, opening position, eccentric compression direction with respect to the strong & weak axis and the eccentricity are investigated to obtain the influence of each parameter on buckling behavior, failure mode and ultimate bearing capacity of the specimen. The test results indicate that all the specimens present distortional buckling or interaction buckling involving distortional mode; The stiffened-web can effectively prevent local buckling of the web; The holes in the web have slight effect on buckling mode; The eccentric compression locations with respect to the strong & weak axis have a significant effect on buckling behaviour of the specimen. Comparing the experimental results with the calculated bearing capacity results according to current Chinese and North American specifications, including GB 50018−2002, JGJ/T 421−2018 and NAS 100−2016, it is found that the calculations with respect to the strong axis adopting Chinese and North American specifications are all conservative; When the specimens are under eccentric compression with respect to the weak axis, the calculated results employing GB 50018−2002 and NAS 100−2016 are both conservative, while the ratio of the test results to the calculation results of JGJ/T 421−2018 averages 1.64, which is too conservative. Therefore, it is proposed that the bearing capacity of eccentric compression with respect to the weak axis should be calculated in accordance with the overall built-up cross-section when the two Σ-shaped channels of composite column work well together.
- cold-formed steel /
- Σ-shaped section /
- composite columns /
- eccentric compression /
- distortional buckling

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图 1 腹板并合冷弯薄壁Σ型钢截面　/mm

Figure 1. Cold-formed thin-walled Σ-shaped built-up section

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图 2 试件编号规则

Figure 2. Specimen numbering rules

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图 3 材性标准件试验

Figure 3. Coupon tests of material property

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图 4 初始缺陷测点布置

Figure 4. Measured arrangement of initial imperfections

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图 5 加载装置

Figure 5. Test setup

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图 6 试件破坏模式

Figure 6. Failure modes of the specimens

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图 7 自攻螺钉约束双肢并和腹板

Figure 7. Self-tapping screws to constrain the composite webs

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8 荷载-轴向位移曲线

8. Load-axial displacement curves

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9 荷载-侧向位移曲线

9. Load-lateral displacement curves

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10 荷载-应变曲线

10. Load-strain displacement curves

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表 1 试验构件设计

Table 1. Specimens design

压弯长度/mm	自攻钉间距/mm	孔洞位置等分	偏压方向及偏心距/mm
400	300(100、150)	−	−
1000	300	L/2	S20(40)、W20
1600	300	L/2	S20(40)、W20
2200	300	L/3	S20(40)、W20
注：S为强轴方向；W为弱轴方向。

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表 2 试件实测尺寸及初始缺陷

Table 2. Measurements of cross-sections and initial imperfections

试件名称	长度L/mm	腹板h/mm	板厚t/mm	翼缘b/mm	卷边d/mm	开孔大小/mm		加劲肋尺寸/mm	螺钉间距/mm	Δ_L/mm	Δ_d/mm	w_s/mm	w_w/mm
试件名称	长度L/mm	腹板h/mm	板厚t/mm	翼缘b/mm	卷边d/mm	圆心距	半径	加劲肋尺寸/mm	螺钉间距/mm	Δ_L/mm	Δ_d/mm	w_s/mm	w_w/mm
Σ400-100-E0-1	397.5	117.05	1.92	80.51	14.70	−	−	10.0	10.10	0.35	2.48	2.53	1.66
Σ400-100-E0-2	397.2	117.30	2.04	80.75	14.47	−	−	9.9	10.00	0.88	2.35	2.61	0.52
Σ400-150-E0	396.9	117.87	1.92	80.33	15.09	−	−	9.8	15.21	0.31	2.07	0.56	0.59
Σ400-300-E0	397.9	120.20	1.91	80.83	15.02	−	−	9.7	29.95	0.19	0.90	3.30	0.57
Σ1000-300-S20-1	998.3	123.92	2.08	80.71	14.84	60.21	29.8	9.9	30.02	0.49	0.96	1.92	1.51
Σ1000-300-S20-2	997.5	123.86	2.03	80.91	14.73	60.31	29.5	10.1	29.99	0.83	0.93	0.89	0.48
Σ1000-300-S40-1	999.0	121.96	2.08	80.71	14.69	60.00	30.0	9.9	30.09	0.63	0.02	1.21	0.82
Σ1000-300-S40-2	997.5	123.08	2.01	80.98	14.51	60.94	29.0	9.8	30.08	0.44	0.54	3.00	0.48
Σ1000-300-W20-1	998.9	122.94	2.11	81.32	14.58	60.80	29.1	10.1	30.26	0.69	0.47	0.66	0.72
Σ1000-300-W20-2	998.5	124.50	2.06	80.41	14.43	60.80	29.2	10.1	30.06	1.00	1.25	3.39	0.66
Σ1600-300-S20-1	1598.8	126.33	2.00	81.02	15.09	60.76	28.0	10.1	30.06	0.80	2.17	2.35	0.39
Σ1600-300-S20-2	1598.5	127.07	1.89	80.20	14.83	61.90	28.0	10.2	30.04	0.41	2.54	1.45	0.71
Σ1600-300-S40-1	1600.5	125.83	1.93	80.39	14.30	61.03	29.0	9.5	30.10	0.89	1.92	1.16	0.81
Σ1600-300-S40-2	1588.9	125.81	2.10	80.63	14.44	60.02	30.0	10.2	30.08	1.23	1.91	1.15	0.93
Σ1600-300-W20-1	1599.1	125.07	2.01	80.99	15.01	61.33	29.0	9.8	30.01	1.01	1.54	1.18	1.28
Σ1600-300-W20-2	1600.5	125.83	2.05	80.82	14.75	61.10	29.0	9.9	30.04	0.53	1.92	1.68	0.42
Σ2200-300-S20-1	2198.2	128.15	2.04	80.92	14.77	60.00	29.5	10.1	30.03	1.11	3.08	2.04	0.45
Σ2200-300-S20-2	2199.2	127.40	2.07	80.57	14.71	59.60	29.5	10.0	29.99	1.01	2.70	0.70	1.88
Σ2200-300-S40-1	2198.2	128.70	2.02	81.10	15.17	59.50	29.5	10.6	30.11	1.41	3.35	1.08	1.56
Σ2200-300-S40-2	2195.9	123.84	2.07	81.04	14.87	59.53	29.9	10.7	30.00	1.18	0.92	2.14	1.19
Σ2200-300-W20-1	2198.5	127.80	2.06	80.64	15.37	58.00	30.0	10.3	30.10	0.55	2.90	2.31	1.77
Σ2200-300-W20-2	2197.6	125.50	2.02	80.63	14.98	60.36	29.5	9.7	29.56	0.95	1.75	3.15	5.98
注：400 mm短柱试件未开孔；开孔为长圆孔，圆心距为孔洞两个半圆圆心间距离。

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表 3 短柱试件试验结果与中美规范计算值对比

Table 3. Comparison of the test results and the calculation results of Chinese and American standards for short axial compression columns

试件名称	A/mm²	L₀/mm	L/mm	屈曲部位	破坏模式	半波长/mm	P_t/kN	P_GB/kN	P_JGJ/T/kN	P_NAS/kN	P_t/P_GB	P_t/P_JGJ/T	P_t/P_NAS
Σ400-100-E0-1	1180.7	462	398	1/2L	D(1)	200	430	362.3	362.30	453.8	1.19	1.19	0.95
Σ400-100-E0-2	1255.6	461	397	1/2L	D(1)	200	425	362.3	362.30	453.8	1.17	1.17	0.94
Σ400-150-E0	1185.5	461	397	1/2L	D(1)	240	422	362.3	362.32	453.8	1.16	1.16	0.93
Σ400-300-E0	1191.5	462	398	1/2L	D(1)	200	415	362.3	362.32	453.8	1.15	1.15	0.91
注：A为截面积； L₀为试件计算长度； L为试件几何长度；P_t为试验值； P_GB为GB 50018−2002计算值； P_JGJ/T为JGJ/T 421−2018计算值；P_NAS为北美NAS 100−2016计算值。

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表 4 压弯试件试验结果与中美规范计算值对比

Table 4. Comparison of the test results and the calculation results of Chinese and American standards for eccentric compressive columns

试件名称	A/mm²	L₀/mm	L/mm	屈曲部位	破坏模式	半波长/mm	P_t/kN	P_GB/kN	P_JGJ/T/kN	P_NAS/kN	P_t/P_GB	P_t/P_JGJ/T	P_t/P_NAS
Σ1000-300-S20-1	1310.5	1062	998	3/4L	D(2)	400	277	234.1	234.1	263.6	1.18	1.18	1.05
Σ1000-300-S20-2	1279.5	1062	998	3/4L	D(2)	400	273	234.1	234.1	263.6	1.17	1.17	1.04
Σ1000-300-S40-1	1301.1	1063	999	3/4L	D(2)+L	400	210	190.2	190.2	202.5	1.10	1.10	1.04
Σ1000-300-S40-2	1262.5	1062	998	3/4L	D(2)	400	212	190.2	190.2	202.5	1.12	1.12	1.05
Σ1000-300-W20-1	1328.2	1063	999	1/2L	D(3)+F	300	224	207.1	145.0	212.7	1.08	1.54	1.05
Σ1000-300-W20-2	1294.4	1063	999	1/2L	D(3)+F	300	239	207.1	145.0	212.7	1.16	1.65	1.13
Σ1600-300-S20-1	1274.2	1663	1599	3/4L	D(3)	500	269	222.2	222.2	240.6	1.21	1.21	1.12
Σ1600-300-S20-2	1198.8	1662	1599	3/4L	D(3)+L	500	271	222.2	222.2	240.6	1.22	1.22	1.13
Σ1600-300-S40-1	1216.7	1665	1601	3/4L	D(3)	500	208	178.7	178.7	185.0	1.16	1.16	1.12
Σ1600-300-S40-2	1327.0	1653	1589	3/4L	D(3)	500	210	178.7	178.7	185.0	1.18	1.18	1.14
Σ1600-300-W20-1	1275.0	1663	1599	1/2L	D(3)+F	500	228	192.4	134.7	195.0	1.19	1.69	1.17
Σ1600-300-W20-2	1300.0	1665	1601	1/2L	D(3)+F	500	258	192.4	134.7	195.0	1.34	1.92	1.32
Σ2200-300-S20-1	1304.0	2262	2198	1/2L	D(3)+FT	650	260	208.7	208.7	230.2	1.25	1.25	1.13
Σ2200-300-S20-2	1316.0	2263	2199	1/2L	D(3)+FT	650	262	208.7	208.7	230.2	1.26	1.26	1.14
Σ2200-300-S40-1	1298.0	2262	2198	1/2L	D(3)+FT	650	200	165.6	165.6	176.6	1.21	1.21	1.13
Σ2200-300-S40-2	1307.0	2260	2196	1/2L	D(3)+FT	650	209	165.6	165.6	176.6	1.26	1.26	1.18
Σ2200-300-W20-1	1318.0	2263	2199	1/2L	D(5)+F	400	192	176.7	123.7	186.4	1.09	1.55	1.03
Σ2200-300-W20-2	1280.0	2262	2198	1/3L	D(4)+F	500	183	176.7	123.7	186.4	1.04	1.48	0.98
平均值											1.18	1.34	1.11
标准差											0.073	0.229	0.075
变异系数											0.062	0.171	0.068
注：A为截面积； L₀为试件计算长度； L为试件几何长度；P_t为试验值； P_GB为GB 50018−2002计算值； P_JGJ/T为JGJ/T 421−2018计算值；P_NAS为北美NAS 100−2016计算值。

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