Simulation of Influence of End Anchorage Degradation of Stirrups Caused by Alkali Aggregate Reaction on Shear Performance of Reinforced Concrete Beams

doi:10.16183/j.cnki.jsjtu.2020.094

Abstract

Abstract:

This paper conducted a three-point loading experiment and analytical investigations on the shear performance of reinforced concrete (RC) beams with anchor defect at the lower end of stirrups. In the experiment, artificial methods were used to simulate the anchor degradation of the lower end of the stirrup caused by the alkali-aggregate reaction (AAR). The results show that, compared with the sound beams, the anchorage degradation of stirrups reduces the shear capacity of RC beams, and the degree of reduction becomes more pronounced with the increase of the local bond degradation area. The decrease in shear capacity is thought to be attributed to the reduction of the shear contribution by the stirrups and the reduction of the shear resistance by interlock action of coarse aggregate between diagonal cracks. The quantitative evaluation of shear contribution based on the computed stirrup strains confirms that the anchorage defect at the lower end of the stirrup reduces both the shear contribution V_c by concrete and V_s by stirrups, and the reduction of V_s is more significant than V_c.

Key words: reinforced concrete beams, alkali aggregate reaction (AAR), end anchorage degradation of stirrups, shear performance, finite element method analysis

CLC Number:

TU375.1

ZHAO Pengfei, XUE Xin, YANG Cheng. Simulation of Influence of End Anchorage Degradation of Stirrups Caused by Alkali Aggregate Reaction on Shear Performance of Reinforced Concrete Beams[J]. Journal of Shanghai Jiao Tong University, 2021, 55(6): 681-688.

Figures/Tables 14

Fig.1

Tab.1

Fig.2

Fig.3

Fig.4

Tab.2

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Tab.3

References 17

[1]	温海锋, 张海波. 碱骨料反应及辅助胶凝材料对其抑制机理的研究综述[J]. 硅酸盐通报, 2019, 38(6):1782-1787.
	WEN Haifeng, ZHANG Haibo. Review of alkali-aggregate reaction and supplementary cementious materials (SCMs) on its inhibition mechanism[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(6):1782-1787.
[2]	徐小伟, 唐红平. 巴基斯坦卡洛特水电工程混凝土碱骨料反应研究[J]. 人民长江, 2018, 49(A02):154-156.
	XU Xiaowei, TANG Hongping. Study on concrete alkali aggregate reaction for Karot Hydropower Station, Pakistan[J]. Yangtze River, 2018, 49(A02):154-156.
[3]	宋百姓, 柯国军, 潘坚文. 混凝土碱骨料反应及力学性能细观模拟[J]. 工程力学, 2017, 34(4):134-139.
	SONG Baixing, KE Guojun, PAN Jianwen. Meso-scale particle modeling of alkali-silica reaction and mechanical properties of concrete[J]. Engineering Mechanics, 2017, 34(4):134-139.
[4]	SAOUMA V E, HARIRI-ARDEBILI M A, LE PAPE Y, et al. Effect of alkali-silica reaction on the shear strength of reinforced concrete structural members. A numerical and statistical study[J]. Nuclear Engineering and Design, 2016, 310:295-310. doi: 10.1016/j.nucengdes.2016.10.012 URL
[5]	WEBB Z D. Experimental investigation of ASR/DEF-induced reinforcing bar fracture[D]. Austin, United States: The University of Texas at Austin, 2011.
[6]	KARTHIK M M, MANDER J B, HURLEBAUS S. Deterioration data of a large-scale reinforced concrete specimen with severe ASR/DEF deterioration[J]. Construction and Building Materials, 2016, 124:20-30. doi: 10.1016/j.conbuildmat.2016.07.072 URL
[7]	王惊旻. 由ASR引起的箍筋断裂试验研究[D]. 扬州: 扬州大学, 2014.
	WANG Jingmin. Evaluation of stirrup fractures due to experimental simulations of ASR[D]. Yangzhou: Yangzhou University, 2014.
[8]	UEHARA N. Rebar damage and internal degradation of concrete due to alkali-aggregate reaction[D]. Kyushu, Japan: Kyushu Institute of Technology, 2016.
[9]	MIYAGAWA T. Fracture of reinforcing steels in concrete damaged by ASR[J]. Construction and Building Materials, 2013, 39:105-112. doi: 10.1016/j.conbuildmat.2012.05.015 URL
[10]	MEGAWA K, NAKAMURA E, SATO Y. Shear behavior of RC beam with unbond regeon and decreased bond strength in stirrups[J]. Proceedings of the Japan Concrete Institute, 2004, 26(2):973-978.
[11]	ABE H, SAITO S, HIGAI T. Investigation on shear failure of RC beams arranging reinforcement with inadequate anchorage[J]. Proceeding of Japan Concrete Institute, 2005, 27(2):337-342.
[12]	HORDIJK D A. Local approach to fatigue of concrete[D]. Doctoral Dissertation: Delft University of Technology, 1991.
[13]	HENDRIKS M, DE BOER A, BELLETTI B, Guidelines for nonlinear finite element analysis of concrete structures[J]. Rijkswaterstaat Centre for Infrastructure, 2017,Report RTD: 1016-1:2017.
[14]	DÖRR K. Ein beitrag zur berechnung von stahlbetonscheiben unter besonderer berücksichtigung des verbundverhaltens[D]. Hesse-Darmstadt: University of Darmstadt, 1980.
[15]	XUE X, SEKI H, SONG Y. Shear behavior of RC beams containing corroded stirrups[J]. Advances in Structural Engineering, 2014, 17(2):165-177. doi: 10.1260/1369-4332.17.2.165 URL
[16]	ROTS J G, NAUTA P, KUSTER G M A, et al. Smeared crack approach and fracture localization in concrete[J]. Heron, 1985(1):1512-1533.
[17]	ACI-ASCE Committee. The shear strength of reinforced concrete members[J]. Journal of the Structural Division, 1973, 99(ST6):1148-1157.

编号	受剪开裂载荷/kN	极限荷载/kN
BC2.0-0	109.3	373.8
BC2.0-1	120.0	358.7
BC2.0-2	102.2	295.1
BC2.0-3	80.3	284.5

编号	ε×10⁶
编号	箍筋①	箍筋②	箍筋③
BC2.0-0	714	1792	2776
BC2.0-1	359	1400	2035
BC2.0-2	12	72	295
BC2.0-3	-8	22	233

编号	V_c		V_s
编号	数值/kN	降比/%	数值/kN	降比/%
BC2.0-0	148.9	-	34.6	-
BC2.0-1	148.6	0.2	18.9	45.4
BC2.0-2	138.0	7.3	8.5	75.5
BC2.0-3	134.0	10.0	6.0	82.5