砖砌体墙后嵌钢筋-嵌缝砂浆界面黏结强度规律

doi:10.13229/j.cnki.jdxbgxb.20230282

摘要/Abstract

摘要：

后嵌钢筋-嵌缝砂浆界面黏结强度是影响无筋砌体抗震加固效果的重要因素。本研究制作了33个砖砌体试件，选用光圆钢筋、变形钢筋和不同强度的水泥砂浆对试件进行嵌缝加固处理，采用自行研发的黏结性能测试装置进行拉拔试验，通过对试件的黏结破坏模式、黏结滑移曲线特征和黏结强度进行分析，得出嵌缝砂浆强度、钢筋直径、黏结长度和钢筋类型等因素对黏结强度的影响规律，建立考虑各因素影响效应的极限黏结强度预测公式，并且从能量角度对黏结强度进行分析。试验结果表明：嵌缝砂浆强度、黏结长度和钢筋类型等对黏结强度均有明显影响，而钢筋直径的变化对黏结强度的影响较小；其他条件相同时，变形钢筋的黏结强度普遍高于光圆钢筋，并且钢筋的黏结强度随嵌缝砂浆强度等级的提高、黏结长度的降低而增大；界面黏结破坏能随嵌缝砂浆强度的变化规律与试验数据规律吻合。研究结果可为嵌筋加固的推广应用提供理论指导。

关键词: 砖砌体结构, 嵌筋加固, 嵌缝砂浆, 拉拔试验, 黏结性能, 黏结强度

Abstract:

The bond strength at the interface between post-embedded reinforcement and caulking mortar is a crucial factor in determining the seismic strengthening efficacy of unreinforced masonry. To investigate this， 33 brick masonry specimens were constructed and reinforced with plain and deformed steel rebars， as well as cement mortar of various strengths. The bond performance of the strengthened specimens was investigated by means of a self-developed pull-out testing device. By analyzing the bond failure mode， bond slip curve characteristics， and bond strength， the bond behavior influencing by the likely impact of factors such as caulking mortar strength， reinforcement diameter， bond length， and reinforcement type on bond strength was evaluated， and a predicting formula of the ultimate bond strength considering various influencing factors was proposed while the predicted bond strength is also analyzed in an energy perspective. The test results showed that the strength of caulking mortar， bond length， and reinforcement type have significantly impact on the bond strength， while changes in reinforcement diameter have little effect. Specifically， the bond strength of deformed rebars has generally higher effect than that of the plain rebars under the same conditions. The bond strength of reinforcement increases with the strength grade of caulking mortar and decreases as the bond length increases. The rule of thumb for the variation of interfacial bond failure energy with the strength of the embedded mortar is consistent with the test data.The research findings provide important theoretical guidance for the wider use and application of embedded reinforcement.

Key words: brick masonry structure, embedded reinforcement, caulking mortar, pull-out test bord performance, bond strength

中图分类号:

TU362

刘廷滨,黄滔,王作伟,欧嘉祥,韩雨. 砖砌体墙后嵌钢筋-嵌缝砂浆界面黏结强度规律[J]. 吉林大学学报(工学版), 2025, 55(1): 198-210.

Ting-bin LIU,Tao HUANG,Zuo-wei WANG,Jia-xiang OU,Yu HAN. Interfacial bond strength between post-embedded reinforcement and caulking mortar in brick masonry wall[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(1): 198-210.

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砂浆类型	砌筑砂浆		嵌缝砂浆
设计抗压强度等级/MPa	M 5		M 5	M 10	M 15	M 20
测试抗压强度/MPa	6.5		6.8	11.9	15.8	19.6

指标	直径/mm	屈服强度/MPa	伸长率/%	弹性模量/GPa	抗拉强度/MPa
HPB300	6	374.8	36	200	549.5
HPB300	8	361.7	32	200	540.2
HRB335	8	402.3	16	200	592.4

试件编号		P_u/kN	τ_u			S_u			破坏模式
试件编号		P_u/kN	E_u/MPa	AVG/MPa	?	E_p/mm	AVG/mm	?	破坏模式
P8-370-M5	1	10.80	1.08	1.02	0.05	0.60	0.57	0.04	拔出
	2	9.00	0.97			0.55			拔出
	3	10.40	1.02			0.55			拔出
P8-370-M10	1	13.50	1.45	1.36	0.06	0.99	0.74	0.31	拔出
	2	12.00	1.29			0.71			拔出
	3	12.50	1.35			0.53			拔出
P8-370-M15	1	14.50	1.56	1.61	0.54	1.01	1.20	0.15	拔出
	2	15.90	1.71			1.23			拔出
	3	14.50	1.56			1.35			拔出
P8-370-M20	1	17.00	1.80	1.87	0.10	2.24	2.32	0.07	拔出
	2	16.20	1.74			2.22			拔出
	3	19.30	2.08			2.50			拔出
P8-240-M15	1	11.50	1.91	1.96	0.05	0.83	0.73	0.14	拔出
	2	11.50	1.91			0.63			拔出
	3	12.50	2.07			0.73			拔出
P6-370-M10	1	9.40	1.34	1.35	0.03	0.93	0.74	0.25	拔出
	2	9.70	1.39			0.74			拔出
	3	9.10	1.31			0.55			拔出
R8-370-M5	1	16.60	1.79	1.74	0.33	2.87	2.69	0.08	破裂
	2	15.60	1.68			2.77			劈裂
	3	16.40	1.77			2.44			劈裂
R8-370-M10	1	19.00	2.04	2.08	0.03	3.61	3.31	0.09	劈裂
	2	19.00	2.04			2.99			劈裂
	3	20.00	2.15			3.34			劈裂
R8-370-M15	1	21.50	2.31	2.33	0.08	4.78	5.14	0.07	劈裂
	2	20.00	2.15			5.18			劈裂
	3	23.50	2.53			5.46			劈裂
R8-370-M20	1	22.60	2.43	2.59	0.06	3.61	2.96	0.22	劈裂
	2	24.40	2.63			2.99			劈裂
	3	25.30	2.72			2.28			劈裂
R8-240-M15	1	15.00	2.49	2.60	0.20	1.15	1.33	0.19	劈裂
	2	19.00	3.15			1.22			劈裂
	3	13.00	2.16			1.61			劈裂