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(1 天津大學(xué)建筑設(shè)計(jì)規(guī)劃研究總院有限公司, 天津 300073; 2 濱海土木工程結(jié)構(gòu)與安全教育部重點(diǎn)實(shí)驗(yàn)室 (天津大學(xué)), 天津 300072; 3 天津大學(xué)建筑工程學(xué)院, 天津 300072)

摘要: 基于離心預(yù)制混凝土組合柱抗震性能試驗(yàn),采用 ABAQUS 軟件對(duì)該類型組合柱在軸壓及水平往復(fù)荷載作用下的受力性能進(jìn)行了非線性有限元分析,研究了軸壓比、預(yù)制管及芯部混凝土強(qiáng)度、體積配箍率和預(yù)制管空心率對(duì)柱承載力及變形能力的影響. 并采用擬合法建立了適用于該類型組合柱的恢復(fù)力模型. 研究結(jié)果表明:有限元結(jié)果與試驗(yàn)結(jié)果吻合較好,在軸壓及水平往復(fù)荷載作用下,柱的破壞模式為壓彎破壞,耗能能力較好. 柱承載力隨軸壓比增加而提高,但變形能力降低,當(dāng)軸壓比超過(guò)臨界值時(shí),柱的受力狀態(tài)轉(zhuǎn)為小偏心受壓,承載力降低;提高預(yù)制管或芯部混凝土強(qiáng)度可提高柱承載力,但會(huì)降低柱的變形性能;提高體積配箍率及降低預(yù)制管空心率可改善柱的變形能力,當(dāng)空心率降低至 20%后,其影響可忽略. 本文所建立的恢復(fù)力模型與試驗(yàn)結(jié)果吻合較好,能夠較為準(zhǔn)確地模擬該類型組合柱的滯回特性.

關(guān)鍵詞: 離心預(yù)制混凝土管組合柱; 抗震性能; 參數(shù)分析; 恢復(fù)力模型; 破壞模式

中圖分類號(hào):TU375. 3 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2023)03-0052-12

DOI:10. 19701 / j. jzjg. 20201254

Finite element analysis on seismic behavior and research on restoring force model of concrete-filled centrifugal precast concrete tube columns

ZHANG Xizhi1,2, ZHANG Tianhe3, ZHANG Shaohua1, ZHANG Yuxin3, LI Xingqian3

(1 Tianjin University Research Institute of Architectural Design and Urban Planning Co. , Ltd. , Tianjin 300073, China;2 Key Laborary of Coast Civil Structure Safety of the Ministry of Education (Tianjin University), Tianjin 300072, China;3 School of Civil Engineering, Tianjin University, Tianjin 300072, China)

Abstract: Based on experimental on seismic behavior of concrete-filled centrifugal precast concrete tube columns, thenonlinear finite element analysis of mechanical behaviors of the columns under axial compression loads and lateral cyclicloads was carried out by using ABAQUS software. The influences of axial compression ratio, the strengths of the precasttube and core concrete, volume ratio of transverse stirrups and hollow ratio of the precast tube on the bearing anddeformation capacity of the columns were studied. The restoring force model of the columns was established by fittingmethod. The results show that the results of finite element simulations are in good agreement with that of the test. Thefailure modes of the columns under axial compression and lateral cyclic loads are compressed-flexural failure, with a goodenergy dissipation performance. The bearing capacity of the columns is enhanced with the increase of axial compressionratio, while deformation capacity deteriorates, when axial compression ratio exceeds the limit value, the bearing capacitydecreases because the stress state of the column changes to small eccentric compression. The bearing capacity can beenhanced by improving the strengths of the precast tube or core concrete, but it has a negative effect on the deformationcapacity of the columns. Increasing the volume ratio of transverse stirrups and decreasing the hollow ratio of the precast tubecan improve the deformation capacity of the columns, but when the hollow ratio is reduced to 20%, the effect can beneglected. The established restoring force model is in good agreement with the experimental results, which can accuratelysimulate the hysteretic behavior of this type of composite columns.

Keywords:concrete-filled centrifugal precast concrete tube column; seismic behavior; parameter analysis; restoring forcemodel; failure mode

∗國(guó)家自然科學(xué)基金資助項(xiàng)目(51578369),天津市科技計(jì)劃資助項(xiàng)目(19YDLYSN00120).

第一作者:張錫治,博士,研究員,博士生導(dǎo)師,主要從事結(jié)構(gòu)抗震和新型裝配式結(jié)構(gòu)體系研究,Email: zhang_xz@ tju. edu. cn.

[引用本文] 張錫治,張?zhí)禚Q,章少華,等. 離心預(yù)制混凝土管組合柱抗震性能有限元分析與恢復(fù)力模型研究[ J].建筑結(jié)構(gòu), 2023, 53 ( 3): 52-63. ZHANG Xizhi, ZHANG Tianhe, ZHANG Shaohua, et al. Finite element analysis onseismic behavior and research on restoring force model of concrete-filled centrifugal precast concrete tube columns[ J].Building Structure,2023,53(3):52-63.