BRBs加固震损装配式混凝土框架结构抗震性能试验

doi:10.13229/j.cnki.jdxbgxb20210175

摘要/Abstract

摘要：

为研究防屈曲支撑加固震损破坏程度在中等以内的装配式混凝土框架结构的抗震性能和支撑的滞回耗能，设计并完成了一榀1/2比例装配式混凝土框架结构的拟静力预损试验，采用防屈曲支撑对震损结构进行加固，并对加固后的结构再次进行拟静力试验。观察和记录了加固前、后试件的试验现象和破坏特征，对结构的承载能力、延性系数、耗能能力等进行了对比分析。试验结果表明：加固后，结构的承载力提高了51.3%、耗能增加1.68倍，延性系数恢复到结构初始延性的88%，结构承载能力和耗能能力得到显著提升，延性系数得到较好恢复；拟静力加载下，防屈曲支撑加固的震损结构破坏模式为支撑梁铰破坏模式。震损的装配式混凝土框架结构仍具有改造价值，采用防屈曲支撑对震损装配式混凝土框架结构进行加固的方法是有效的。

关键词: 土木工程, 震损PC框架结构, 拟静力试验, 破坏模式, 防屈曲支撑

Abstract:

The pseudo-static test was conducted to investigate the seismic behavior of earthquake-damaged precast concrete（PC） frame structures （the earthquake-damaged frame structures are within moderate damage） strengthened with buckling-restrained braces（BRBs） and to analyze the hysteretic energy dissipation of BRBs. A half-scale PC frame structure was fabricated. After it was pre-damaged by quasi-static loading， it was strengthened with BRBs， and then tested under pseudo-static loading again. The structural experimental phenomena and failure characteristics were observed and recorded. The structural seismic behavior， including bearing capacity， ductility， and energy dissipation， was evaluated. The test results show that after repairing with BRBs， the bearing capacity and energy dissipation can be significantly improved （the ultimate bearing capacity and energy dissipation increased by 51.3% and 68%， respectively）， other seismic behavior like the ductility coefficient can be recovered well （ductility coefficient restored to 88% of the initial ductility of the structure）； the earthquake-damaged PC frame structure strengthened with BRBs under pseudo-static loading exhibited a failure mode of beam-hinge with BRBs. The earthquake-damaged PC frame structures still had retrofit value and that the above retrofitting method was effective.

Key words: civil engineering, earthquake-damaged precast concrete frame structure, pseudo-static test, failure mode, buckling-restrained braces

中图分类号:

TU375.4

陈伟宏,陈艳,洪秋榕,崔双双,颜学渊. BRBs加固震损装配式混凝土框架结构抗震性能试验[J]. 吉林大学学报(工学版), 2022, 52(8): 1817-1825.

Wei-hong CHEN,Yan CHEN,Qiu-rong HONG,Shuang-shuang CUI,Xue-yuan YAN. Seismic performance of earthquake⁃damaged precast concrete frame structures strengthened with BRBs[J]. Journal of Jilin University(Engineering and Technology Edition), 2022, 52(8): 1817-1825.

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钢筋种类	直径 /mm	屈服强度 /MPa	抗拉强度 /MPa	屈服应变 /10^-6	弹性模量/（N·mm^-2）
HPB300	8	310	405	1527	2.03×10⁵
HRB400	12	403	530	1955	2.02×10⁵
HRB400	20	435	629	2061	2.11×10⁵

位移值/mm	层间位移角	循环次数
±1	1/1500	1
±2	1/750	1
±3	1/500	3
±5	1/300	3
±7	1/200	3
±10	1/150	3
±15	1/100	3
±20	1/75	3
±25	1/60	3
±30	1/50	3
±35	1/42	1
±40	1/37	1
±45	1/33	1
±50	1/30	1

试件	加载方向	屈服位移 /mm	屈服荷载 /kN	延性系数
PC1框架	推	16.59	288.9	2.70
PC1框架	拉	16.71	-275.4	2.70
PC2框架	推	18.27	430.3	2.37
PC2框架	拉	19.71	-369.5	2.37

工况	层间位移角	BRB滞回面积/（kN·mm）	PC2滞回面积/（kN·mm）	比例/%
±3mm	1/500	176	392	45
±5mm	1/300	744	1 094	68
±7mm	1/200	1 166	1 977	59
±10mm	1/150	1 567	3 483	45
±15mm	1/100	2 794	6 654	42
±20mm	1/75	4 312	9 801	44
±25mm	1/60	6 060	12 625	48
±30mm	1/50	6 979	13 422	52