含裂隙无腹筋梁的抗剪承载能力

doi:10.6040/j.issn.1672-3961.0.2021.004

摘要/Abstract

摘要：

分析混凝土梁内部既有裂隙的位置及角度对无腹筋梁抗剪承载力的影响, 制作多组含既有裂隙的试验梁, 进行梁的三点弯曲试验, 研究位于梁跨中和梁侧基本拱体范围内既有裂隙对无腹筋梁抗剪承载力的影响及裂缝扩展规律。结果表明: 梁上的既有裂隙对梁的抗剪承载力有削弱作用; 在其他条件相同的情况下, 梁跨中既有裂隙的裂尖距离梁底中部越近, 对无腹筋梁抗剪承载力的削弱作用越大; 梁侧既有裂隙的角度与基本拱体重合度越高, 对无腹筋梁抗剪承载力的削弱作用越大；梁侧既有裂隙的角度与基本拱体重合度越高, 梁底裂缝越容易扩展通过既有裂隙的两个裂尖, 反之, 梁底裂缝可扩展至既有裂隙中部。

关键词: 混凝土, 无腹筋梁, 既有裂隙, 抗剪承载力, 基本拱体

Abstract:

In order to investigate the effect of the position and angle of the pre-existing cracks on the shear capacity of beams without web reinforcement, a number of experiment beams with pre-existing cracks were fabricated, the three-point bending experiment of the beam was carried out. The influence of pre-existing cracks located in the basic arch of the beam span and the beam side on the shear capacity of beams without web reinforcement and the law of crack propagation were studied. The results showed that the pre-existing cracks on the beam had a weakening effect on the shear capacity of the beam, which made the beam more prone to diagonal tensile failure. Under the same conditions, when the crack tip of the pre-existing crack in the beam span was closer to the middle point of the bottom of the beam, the greater the weakening effect on the shear bearing capacity of the beam without web reinforcement. When the coincidence degree of the angle of the pre-existing cracks on the beam side and the basic arch was higher, the greater the weakening effect on the shear bearing capacity of the beam without web reinforcement, and the cracks at the bottom of the beam propagate through the two crack tips of the pre-existing cracks was easier. Conversely, the cracks at the bottom of the beam could extend to the middle of the pre-existing cracks.

Key words: concrete, beam without web reinforcement, pre-existing crack, shear capacity, basic arch

中图分类号:

TU375.1

刘文杰,杨学英,张波,范志鑫,李成新,杨惠茗,李景龙. 含裂隙无腹筋梁的抗剪承载能力[J]. 山东大学学报 (工学版), 2022, 52(3): 42-50.

Wenjie LIU,Xueying YANG,Bo ZHANG,Zhixin FAN,Chengxin LI,Huiming YANG,Jinglong LI. Shear capacity of beams with cracks and without web reinforcement[J]. Journal of Shandong University(Engineering Science), 2022, 52(3): 42-50.

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工况编号	裂隙位置	裂隙角度/(°)
工况1	—	—
工况2	梁跨中(L/2处)	0
工况3	梁跨中(L/2处)	45
工况4	梁跨中(L/2处)	90
工况5	梁侧(5L/16处)	0
工况6	梁侧(5L/16处)	30
工况7	梁侧(5L/16处)	45
工况8	梁侧(5L/16处)	60
工况9	梁侧(5L/16处)	90
工况10	梁侧(5L/16处)	120
工况11	梁侧(5L/16处)	135
工况12	梁侧(5L/16处)	150

工况编号	极限荷载/ kN	极限荷载值的变化幅度/%	梁底最大应变/10^-6
工况1	14.78	对照组	1 392.00
工况2	12.42	-16.0	1 184.00
工况3	11.13	-24.7	988.00
工况4	9.76	-34.0	784.00
工况5	8.90	-39.8	695.00
工况6	7.41	-49.9	643.00
工况7	8.52	-42.4	728.00
工况8	10.68	-27.7	904.00
工况9	11.97	-19.0	1 195.00
工况10	14.69	-0.6	1 259.00
工况11	12.80	-13.4	1 204.00
工况12	13.98	-5.4	1 380.00

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