圆钢管自密实混凝土纯弯力学性能

丁发兴; 余志武

圆钢管自密实混凝土纯弯力学性能

中南大学土木建筑学院, 湖南长沙 410075

基金项目:

国家自然科学基金项目 50438020

国家自然科学基金项目 50278097

国家自然科学基金项目 50578162

湖南省自然科学基金项目 03JJY3089

详细信息

作者简介:
丁发兴(1979-), 男, 浙江瑞安人, 中南大学工学博士研究生, 从事结构工程研究

中图分类号: U441
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- 被引次数: 0
出版历程
- 收稿日期: 2005-09-22
- 刊出日期: 2006-03-25

Pure Bending Properties of Self-Compacting Concrete Filled Circular Steel Tube

School of Civil and Architectural Engineering, Central South University, Changsha 410075, Hunan, China

More Information

Author Bio:
DING Fa-xing(1979-), male, doctoral student, 86-731-2656540, dinfaxin@mail.csu.edu.cn

摘要

摘要: 基于合理的钢材和核心混凝土拉压本构模型, 利用截面分层法对钢管混凝土纯弯构件弯矩-曲率进行全过程分析, 建立了钢管混凝土实用组合抗弯刚度、极限抗弯承载力等计算式和钢管混凝土组合梁单元弯矩-曲率全曲线实用计算方法, 通过3根钢管自密实混凝土和1根钢管普通混凝土受弯构件的试验研究, 考察了混凝土强度和含钢率对构件纯弯性能的影响。试验结果表明, 受弯构件受压区钢管对混凝土产生约束套箍作用, 受拉区钢管处于双向受拉应力状态, 提高混凝土强度对提高极限弯矩作用不明显, 而增大含钢率对提高极限弯矩作用较明显, 并且与分层法相比, 组合单元法在保证精度的前提下, 减少了截面分层, 提高了程序的计算速度。
- 桥梁工程 /
- 钢管混凝土 /
- 自密实混凝土 /
- 抗弯承载力 /
- 抗弯刚度 /
- 组合单元 /
- 弯矩-曲率全曲线
Abstract: Based on appropriate numerical constitutive model of concrete filled steel tube, layered method was adopted to calculate the complete moment-curvature curves of concrete filled circular steel tube (CFST) subjected to pure bending, the practical composite flexural stiffness, practical flexural capacity and practical moment-curvature relationships of composite element for CFST beams were presented, the tests of three self-compacting concrete filled circular steel tubes and one normal concrete filled circular steel tube subjected to pure bending were carried out, the influences of concrete strength and steel ratio on the pure bending properties of the specimens were discussed.Experimental result shows that the confinement effect between steel tube and concrete happens in compressive side, but the steel tube is in biaxial tensile stress conditions in tensile side, with the strength increase of concrete, the flexural capacities of the specimens are hardly influenced, but with steel ratio increase, the flexural capacities are enhanced significantly.
- bridge engineering /
- concrete filled steel tubes /
- selfcompacting concrete /
- flexural capacity /
- flexural stiffness /
- composite element /
- moment-curvature curves

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图 1 计算模型

Figure 1. Calculation Model

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图 2 γ^m-Φ关系

Figure 2. Relationship of γ^m and Φ

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图 3 试验装置

Figure 3. Test Installation

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图 4 荷载与跨中挠度曲线Fig.4 Relation of Load and Mid-Span Deflection

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图 5 跨中弯矩与曲率曲线Fig.5 Relation of Mid-Span Moment and Curvature

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图 6 荷载与应变曲线

Figure 6. Curves of Load and Strain

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图 7 荷载与应变率曲线

Figure 7. Curves of Load and Strain Ratio

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图 8 钢管表面截面应变

Figure 8. Strain Distribution of Mid-Span Section

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图 9 各级荷载作用下挠度变形

Figure 9. Deflection Shapes of Different Loads

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图 10 M-φ曲线

Figure 10. M-φ Curves

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图 11 P-y_c曲线

Figure 11. P-y_c Curves

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表 1 受弯构件参数

Table 1. Parameters of Bending Specimens

序号	试件编号	D/mm	t/mm	L/mm	f_s/MPa	f_cu/MPa	Φ	备注
1	B3C4A	165	2.70	1500	350	46.3	0.686	普通混凝土
2	B3S4A		2.74			57.0	0.547	自密实混凝土
3	B3S6A		2.75			77.2	0.385
4	B4S6A		3.93			77.2	0.563

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表 2 结果比较

Table 2. Result Comparison

	试件编号	(EI) $_{s c}^{0}$ / (kN·m²)	(EI)_sc^c/ (kN·m²)	(EI) $_{s c}^{0}$ / (EI)_sc^c
本文	B3C4A	1 144.2	1 361.2	0.841
	B3S4A	1 296.7	1 407.3	0.921
	B3S6A	1 258.4	1 460.2	0.862
	B4S6A	1 882.5	1 909.2	0.986
文献[6]	OCSA100-1	234.9	218.5	1.075
	OCSA100-2	251.3		1.150
	OCSB100	255.9		1.171
	OCSA200-1	2 149.3	2 131.8	1.008
	OCSA200-2	2 155.9		1.011
	OCSB200	2 253.5		1.057

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参考文献(10)

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