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学者姓名:夏樟华
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At present, RC utility tunnels are widely used in urban utility tunnels. As a typical confined space, the complex load effect generated by the internal gas explosion of the gas tank of utility tunnel may lead to local damage or overall destruction of the structure of RC utility tunnel. Therefore, it is an important topic to improve the anti-explosion capability of the utility tunnel and ensure the normal operation of the utility tunnel after gas explosion. UHPC structure is considered to have excellent anti-explosion performance, so a ribbed thin-walled UHPC utility tunnel structure was proposed, which improved the overall stiffness and anti-explosion performance of the UHPC utility tunnel through the ribbed section. In view of the shortcomings of fluid-solid coupling method in gas simulation, Computational Fluid Dynamics (CFD) was used to calculate the overpressure distribution after gas explosion in UHPC utility tunnel. The accuracy of UHPC constitutive model and prestress simulation method was verified by testing results from the gas explosion on unbonded prestressed UHPC slab. The gas explosion damage mechanism of ribbed thin-walled UHPC utility tunnel, UHPC-NC combined utility tunnel and RC utility tunnel were comparatively analyzed. And the pre-fabricated stiffener height, UHPC slab thickness and UHPC strength were investigated on the anti-explosion performance of ribbed thin-walled UHPC utility tunnel against gas explosion. It is found that the UHPC strength needs to be enhanced dramatically to improve the blast resistance. The anti-explosion capability of utility tunnel can be effectively increased by increasing the rib height or increasing the thickness of the UHPC utility tunnel structure, and the damage pattern of the utility tunnel can also be changed from flexure-shear failure to bending failure. The results of the study can provide a reference for the damage analysis and anti-explosion design of ribbed thin-walled UHPC utility tunnels. © 2024 The Authors
Keyword :
Ant-explosion Capability Ant-explosion Capability Gas Explosion Gas Explosion Thin-walled Thin-walled UHPC UHPC Utility Tunnel Utility Tunnel
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GB/T 7714 | Xia, Z. , Li, H. , Xie, J. et al. Numerical study on dynamic response of a novel ribbed thin-walled UHPC box-type utility tunnel under gas explosion [J]. | Case Studies in Construction Materials , 2024 , 21 . |
MLA | Xia, Z. et al. "Numerical study on dynamic response of a novel ribbed thin-walled UHPC box-type utility tunnel under gas explosion" . | Case Studies in Construction Materials 21 (2024) . |
APA | Xia, Z. , Li, H. , Xie, J. , Zong, Z. , Zhang, Z. . Numerical study on dynamic response of a novel ribbed thin-walled UHPC box-type utility tunnel under gas explosion . | Case Studies in Construction Materials , 2024 , 21 . |
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With the rapid development of urban transportation,its construction requirements are increasingly high,urban bridges are mainly ramp bridges,ramps and other non-regular bridges. In order to obtain the damage mechanism and hysteresis characteristics of the fabricated pier under the combined seismic action of compression-bending- shearing-torsion,the quasi-static test for three types of bridge piers including prefabricated piers with grouting sleeves(GS),prefabricated piers with grouting sleeve and concrete-filled steel tube(GSS)and cast-in-place reinforced concrete(RC)pier subjected to combined loads was carried out. Combining the shearing-torsion correlation curve in the existing code for design of concrete structures,the shearing and torsion load capacity of the fabricated pier under the combined load was analyzed and compared with the test results. The results show that the GS specimen and RC specimen are dominated by compression bending and torsion damage,while the GSS specimen with inserted steel tube shear keys undergo plastic hinge uplift and exhibit shear torsion damage. GS and RC speci⁃ mens have better bending energy dissipation capacity,while GSS specimen with the steel tube shear key has a larger bending capacity. The assembled pier joints resulted in weaker integrity,and the torsional load capacity of the GS and GSS specimens were less than that of the RC specimen. The shear torsion correlation of each specimen under combined load is close to the quarter-circle theoretical curve in the specification. The research results can provide a reference for the seismic performance analysis of fabricated piers with grouting sleeves under the combined action of compression-bending-shearing-torsion. © 2024 Hunan University. All rights reserved.
Keyword :
Bridge piers Bridge piers Concrete construction Concrete construction Energy dissipation Energy dissipation Fabrication Fabrication Grouting Grouting Mortar Mortar Reinforced concrete Reinforced concrete Shearing Shearing Torsional stress Torsional stress Tubular steel structures Tubular steel structures Urban transportation Urban transportation
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GB/T 7714 | Lin, Youqing , Lai, Shiyong , Xia, Zhanghua et al. Seismic Performance of Grouted Sleeve Fabricated RC Pier under Compression-bending-shearing-torsion Load [J]. | Journal of Hunan University Natural Sciences , 2024 , 51 (3) : 182-192 . |
MLA | Lin, Youqing et al. "Seismic Performance of Grouted Sleeve Fabricated RC Pier under Compression-bending-shearing-torsion Load" . | Journal of Hunan University Natural Sciences 51 . 3 (2024) : 182-192 . |
APA | Lin, Youqing , Lai, Shiyong , Xia, Zhanghua , Wang, Darong . Seismic Performance of Grouted Sleeve Fabricated RC Pier under Compression-bending-shearing-torsion Load . | Journal of Hunan University Natural Sciences , 2024 , 51 (3) , 182-192 . |
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为明确并提升承插式拼装桥墩抵抗压弯扭等复合荷载的能力,提出了一种结合灌浆套筒和承插口组合连接的新型承插装配式墩,通过复合荷载作用下的拟静力试验对比了现浇(reinforced concrete, RC)、灌浆套筒(grouting and sleeve, GS)、承插口(socket with ultra-high performance concrete, SU)和结合套筒连接钢筋的新型承插(grouting sleeve and socket with ultra-high performance concrete, GSU)连接拼装桥墩的损伤机理和滞回性能,结合有限元模型重点讨论了承插口深度对滞回性能的影响。结果表明:4个构件的破坏模式都是以受弯破坏为主的弯扭破坏,其中SU构件出现了轻微拔起的现象,而对应的GSU构件并未出现该现象,与RC构件接近;各构件的剪力-墩顶位移骨架发展趋势比较一致,由于GSU构件纵向钢筋连续,具有更好的整体性能,其抗弯承载力与RC构件接近,且明显大于SU和GS构件,4个构件弯曲滞回耗能较为接近;承插口深度为1.0倍截面宽度的GSU构件抗扭承载力略高于RC构件,且明显大于其余装配式墩,GSU构件的扭转刚度、延性系数和耗能能力均大于其他3个墩;当承插口深度采用0.5倍构件截面宽度时,新型承插GSU构件的抗弯和抗扭承载力均略高于整体现浇构件,具有良好的抵抗压弯扭荷载的能力,可以实现浅承插口连接。研究结果可为压弯扭复合作用下装配式墩的应用提供试验依据。
Keyword :
压弯扭作用 压弯扭作用 抗震性能 抗震性能 拟静力试验 拟静力试验 新型承插 新型承插 桥梁工程 桥梁工程 浅承插口 浅承插口 节段拼装桥墩 节段拼装桥墩
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GB/T 7714 | 夏樟华 , 谢君 , 范千 et al. 压弯扭作用下新型承插装配式桥墩的抗震性能 [J]. | 振动与冲击 , 2024 , 43 (12) : 118-130 . |
MLA | 夏樟华 et al. "压弯扭作用下新型承插装配式桥墩的抗震性能" . | 振动与冲击 43 . 12 (2024) : 118-130 . |
APA | 夏樟华 , 谢君 , 范千 , 陈金盛 , 林元铮 . 压弯扭作用下新型承插装配式桥墩的抗震性能 . | 振动与冲击 , 2024 , 43 (12) , 118-130 . |
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为揭示考虑二次受力UHPC加固桥墩偏压受力的损伤机理和极限状态,设计制作了UHPC加固RC墩和未加固墩构件,并进行了相应的试验研究和理论分析,并与未加固墩进行了比较.开展了考虑二次受力的UHPC增大截面法加固RC桥墩的小偏压试验,研究了不同初始受力条件下加固墩的破坏模式和极限承载力.结合有限元模型讨论了UHPC抗压强度、加固层的厚度和配筋率对极限承载力的影响.根据极限状态下的受力特性和平衡关系,推导了UHPC加固RC墩偏压极限承载力计算公式.结果表明:UHPC搭配钢筋网加固墩小偏压承载力与未加固墩相比,提升幅度达到了 183%以上.UHPC强度对试件极限承载力的影响较大,UHPC厚度增大对加固试件承载力提高也较明显,加固层配筋率对构件承载力的提高影响较小.初始荷载的增大会降低原墩的混凝土利用率,降低加固墩的极限承载力.所提出考虑二次受力公式的计算承载力与实测值误差在3%之内,与有限元计算值误差在 8%之内,具有较高的计算精度.研究结果可以为UHPC加固RC墩偏压承载力计算提供理论依据.
Keyword :
UHPC加固 UHPC加固 二次受力 二次受力 偏压 偏压 极限承载力 极限承载力 桥墩 桥墩
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GB/T 7714 | 夏樟华 , 王明鎏 , 林上顺 et al. 考虑二次受力的UHPC加固RC墩偏压极限承载力 [J]. | 工程力学 , 2024 , 41 (7) : 212-225 . |
MLA | 夏樟华 et al. "考虑二次受力的UHPC加固RC墩偏压极限承载力" . | 工程力学 41 . 7 (2024) : 212-225 . |
APA | 夏樟华 , 王明鎏 , 林上顺 , 林龙镁 , 黎雅乐 . 考虑二次受力的UHPC加固RC墩偏压极限承载力 . | 工程力学 , 2024 , 41 (7) , 212-225 . |
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To reveal the damage mechanism and limit state of UHPC strengthened piers under eccentric compression with secondary stress considered, the UHPC strengthened RC piers were designed and fabricated, and the corresponding experimental study and theoretical analysis were conducted and compared with un-strengthened RC piers. The small eccentric load tests of UHPC strengthened RC piers with section enlargement method considering secondary stress were carried out, and the failure mode and ultimate load capacity of the strengthened piers with different initial stress were studied. Finite element models of strengthened columns were established, and the influence of UHPC strength, UHPC thickness and longitudinal reinforcement ratio on the ultimate load capacity was discussed by employing the finite element model. Based on the mechanical characteristics and equilibrium relations in limit state, the formula for calculating the ultimate load capacity of RC piers strengthened with UHPC was derived. The test results show that the load capacity of UHPC strengthened RC piers with reinforcement mesh is 183% larger than that of the un-strengthened pier under small eccentric load. The ultimate load capacity of the strengthened piers increases with the UHPC strength. The UHPC thickness has an obvious effect on the load capacity of the strengthened specimens, while the longitudinal reinforcement ratio has small effect on the load capacity. The increase of initial load will reduce the concrete utilization of the original piers, as well as the load capacity of the strengthened piers. The calculated load capacity of the proposed formula considering the secondary force has an error of less than 3% compared with the measured value, and less than 8% compared with the finite element calculation value, showing a relatively high calculation accuracy. The research results can provide a theoretical basis for the calculation of load capacity of RC piers strengthened with UHPC under eccentric compression. © 2024 Tsinghua University. All rights reserved.
Keyword :
eccentric compression eccentric compression pier pier secondary load secondary load strengthened with UHPC strengthened with UHPC ultimate load capacity ultimate load capacity
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GB/T 7714 | Xia, Z.-H. , Wang, M.-L. , Lin, S.-S. et al. ULTIMATE LOAD CAPACITY OF UHPC STRENGTHENED RC PIER UNDER ECCENTRIC COMPRESSION CONSIDERING SECONDARY LOAD; [考虑二次受力的 UHPC 加固 RC 墩偏压极限承载力] [J]. | Engineering Mechanics , 2024 , 41 (7) : 212-225 . |
MLA | Xia, Z.-H. et al. "ULTIMATE LOAD CAPACITY OF UHPC STRENGTHENED RC PIER UNDER ECCENTRIC COMPRESSION CONSIDERING SECONDARY LOAD; [考虑二次受力的 UHPC 加固 RC 墩偏压极限承载力]" . | Engineering Mechanics 41 . 7 (2024) : 212-225 . |
APA | Xia, Z.-H. , Wang, M.-L. , Lin, S.-S. , Lin, L.-M. , Li, Y.-L. . ULTIMATE LOAD CAPACITY OF UHPC STRENGTHENED RC PIER UNDER ECCENTRIC COMPRESSION CONSIDERING SECONDARY LOAD; [考虑二次受力的 UHPC 加固 RC 墩偏压极限承载力] . | Engineering Mechanics , 2024 , 41 (7) , 212-225 . |
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为研究内置薄钢板的纤维复合材料接头的连接性能,对该连接接头结构展开单轴拉伸试验.采用ABAQUS重点对影响连接性能的端径比(E/D)、边径比(Sw/D)、列径比(S/D)和孔径厚度比(D/t)等几何连接参数进行研究.研究结果表明:内置薄钢板的纤维复合材料连接接头相较于无内置钢板的纤维复合材料连接接头,具有更大的刚度,峰值荷载和峰值位移分别提升约50%和58%,孔周应力集中现象有所降低,改善了破坏模式,表现出较好的承载能力与延性性能;几何连接参数对连接接头的承载能力和失效模式有较大的影响,为提高连接效率,建议选用参数Sw/D≥2、E/D≥4、4≤S/D≤5、1.6≤D/t≤2.
Keyword :
内置薄钢板 内置薄钢板 力学性能 力学性能 有限元分析 有限元分析 纤维复合材料 纤维复合材料 连接接头 连接接头
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GB/T 7714 | 张景杭 , 姜绍飞 , 夏樟华 et al. 内置薄钢板的纤维复合材料接头连接性能 [J]. | 福州大学学报(自然科学版) , 2024 , 52 (5) : 587-594 . |
MLA | 张景杭 et al. "内置薄钢板的纤维复合材料接头连接性能" . | 福州大学学报(自然科学版) 52 . 5 (2024) : 587-594 . |
APA | 张景杭 , 姜绍飞 , 夏樟华 , 林永福 , 洪俊贤 . 内置薄钢板的纤维复合材料接头连接性能 . | 福州大学学报(自然科学版) , 2024 , 52 (5) , 587-594 . |
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To study the seismic restoring force model of basalt fiber reinforced polymer (BFRP) shell reinforced RC pier columns without drainage, numerical analysis was conducted on the shell reinforced reinforced concrete (RC) pier columns using OpenSees finite element software on the basis of quasi-static tests. The main research parameters were the strength of filled layer concrete, shell thickness, reinforcement height, and axial compression ratio. Results show that the higher the strength level of the filled layer concrete, the stronger the seismic performance of the pier column. However, the seismic performance of the filled layer concrete with a strength level above C40 is relatively similar to that of the pier columns. The seismic performance of pier columns with larger thickness reinforced by formwork is better than that of pier columns with smaller thickness. When the reinforcement height of the formwork is high, the seismic performance of the pier column is good. When the reinforcement height is greater than 2-3 times the plastic hinge height of the original pier columns, the seismic performance improvement effect tends to be stable. The larger the axial compression ratio, the faster the stiffness degradation of the pier column, which is unfavorable for the development of ductility. Then through data regression analysis, a restoring force model for BFRP shell reinforced RC pier columns was established. The comparison shows that the restoring force model fitted well with the experimental curve and could effectively reflect the hysteresis performance of the reinforced pier columns, providing reference for the seismic performance analysis of such structures. © 2024 Chinese Vibration Engineering Society. All rights reserved.
Keyword :
Columns (structural) Columns (structural) Compression ratio (machinery) Compression ratio (machinery) Convergence of numerical methods Convergence of numerical methods Fiber reinforced concrete Fiber reinforced concrete Fiber reinforced plastics Fiber reinforced plastics Seismic response Seismic response Shells (structures) Shells (structures)
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GB/T 7714 | Zhang, Jinghang , Xia, Zhanghua , Jiang, Shaofei et al. A restoring force model of RC pier columns reinforced by a BFRP shell without drainage [J]. | Journal of Vibration and Shock , 2024 , 43 (16) : 192-203 . |
MLA | Zhang, Jinghang et al. "A restoring force model of RC pier columns reinforced by a BFRP shell without drainage" . | Journal of Vibration and Shock 43 . 16 (2024) : 192-203 . |
APA | Zhang, Jinghang , Xia, Zhanghua , Jiang, Shaofei , Hong, Junxian , Zhu, Pu , Fan, Qian . A restoring force model of RC pier columns reinforced by a BFRP shell without drainage . | Journal of Vibration and Shock , 2024 , 43 (16) , 192-203 . |
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JGJ 138 2016, CH 3-78, YB 9082 2006, AISC 360-16, and YE Lie-ping's formulas were used to calculate the ultimate flexural capacities of 51 collected specimens of steel reinforced concrete (SRC) beams with rectangular sections. The calculated results were compared with the test values. The ranges of parameters of the collected specimens and the reasons for the calculation errors of the existing calculation methods were analyzed. The limitations of the existing calculation methods were discussed in terms of the calculation theory and other aspects. Theoretical derivations were performed, and a method for calculating the ultimate flexural capacities of SRC beams with rectangular sections was proposed, and the ultimate flexural capacities of the collected specimens were calculated by using the proposed method. Analysis results show that some deviations arc found between the calculated values obtained by the existing calculation methods and the test values. The height value of the compression zone in CH 3-78 is not appropriate, and the calculation error of this method increases with the increase in concrete strength. The impact of the relative relationship between the neutral axis and the position of the structural steel on the calculation results is not considered in JGJ 138—2016, and limitations exist. YB 9082—2006 and AISC 360-16 do not take into account the interaction between structural steel and concrete or the arrangement of the structural steel. The YE Lie-ping's formulas produce conservative results. The average ratio of the values calculated by the proposed method for the ultimate flexural capacity to the test values of specimens is 0. 953, with a variance of 0. 015. The calculated values agree well with the test values. The steel ratios of the collected SRC beam specimens range from 1. 77% to 5. 77%, which is smaller than the reasonable steel ratio range suggested by YB 9082—2006. Therefore, it is necessary to carry out further supplementary tests of specimens with high steel ratios in the future, so as to improve the calculation method for the ultimate flexural capacity of SRC beams with rectangular sections. 1 tab, 10 figs, 31 refs. © 2024 Chang'an University. All rights reserved.
Keyword :
Bridges Bridges Concrete beams and girders Concrete beams and girders Reinforced concrete Reinforced concrete Steel beams and girders Steel beams and girders Steel construction Steel construction Steel research Steel research
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GB/T 7714 | Lin, Shang-Shun , Ji, Bang-Chong , Xia, Zhang-Hua et al. Ultimate flexural capacity of steel reinforced concrete beams with rectangular section [J]. | Journal of Traffic and Transportation Engineering , 2024 , 24 (1) : 146-157 . |
MLA | Lin, Shang-Shun et al. "Ultimate flexural capacity of steel reinforced concrete beams with rectangular section" . | Journal of Traffic and Transportation Engineering 24 . 1 (2024) : 146-157 . |
APA | Lin, Shang-Shun , Ji, Bang-Chong , Xia, Zhang-Hua , Liu, Jun-Ping , Lin, Jian-Fan , Zhao, Jin-Bing . Ultimate flexural capacity of steel reinforced concrete beams with rectangular section . | Journal of Traffic and Transportation Engineering , 2024 , 24 (1) , 146-157 . |
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采用JGJ 138—2016、СИ3-78、YB 9082—2006、AISC 360-16、叶列平公式,计算了所收集的51个矩形截面型钢混凝土(SRC)梁试件的抗弯极限承载力,并将计算结果与试验值进行比较;分析了所收集试件的参数范围及现有计算方法出现计算误差的原因,讨论了现有计算方法在计算理论等方面存在的局限性,并进行理论推导,提出了矩形截面SRC梁抗弯极限承载力计算方法;采用所提出的计算方法,计算了所收集试件的抗弯极限承载力。分析结果表明:现有计算方法的计算值与试验值均存在一些偏差;СИ3-78中的受压区高度取值不合理,且该方法的计算误差随混凝土强度提高而增大;JGJ 138—2016未考虑中性轴与型钢位置的相对关系对计算结果的影响,存在局限性;YB 9082—2006与AISC 360-16未考虑型钢与混凝土相互作用及型钢的布置方式等问题;叶列平公式计算结果较为保守;采用提出的抗弯极限承载力计算方法得到的计算值与试件试验值的比值均值为0.953,方差为0.015,计算值与试验值吻合较好;所收集SRC梁试件的含钢率为1.77%~5.77%,小于YB 9082—2006所建议的合理含钢率范围,因此,今后还需进一步开展高含钢率试件的补充试验,以便完善矩形截面SRC梁的抗弯极限承载力计算方法。
Keyword :
含钢率 含钢率 型钢混凝土梁 型钢混凝土梁 抗弯极限承载力 抗弯极限承载力 桥梁工程 桥梁工程 规范 规范 计算精度 计算精度
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GB/T 7714 | 林上顺 , 暨邦冲 , 夏樟华 et al. 矩形截面型钢混凝土梁抗弯极限承载力 [J]. | 交通运输工程学报 , 2024 , 24 (01) : 146-157 . |
MLA | 林上顺 et al. "矩形截面型钢混凝土梁抗弯极限承载力" . | 交通运输工程学报 24 . 01 (2024) : 146-157 . |
APA | 林上顺 , 暨邦冲 , 夏樟华 , 刘君平 , 林建凡 , 赵锦冰 . 矩形截面型钢混凝土梁抗弯极限承载力 . | 交通运输工程学报 , 2024 , 24 (01) , 146-157 . |
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随着城市交通的快速发展,对其建设要求越来越高,城市桥梁主要为匝道桥、斜交桥等非规则桥梁.为得到压弯剪扭等复合地震作用下装配式墩的损伤机理和滞回特性,进行了灌浆套筒连接(Grouting Sleeve,GS)、灌浆套筒和钢管混凝土剪力键组合连接(Grouting Sleeve and Steel-tube,GSS)装配式墩和钢筋混凝土现浇(Reinforced Concrete,RC)墩等三种桥墩在压弯剪扭复合作用下的拟静力试验.结合现有混凝土结构设计规范计算剪扭相关曲线,并与试验结果进行对比,分析装配式墩复合荷载作用下的剪扭承载能力.结果表明:GS构件与RC构件以压弯扭破坏为主,而插入钢管剪力键的GSS构件则发生塑性铰上移,呈现出剪扭破坏的特征.GS构件和RC构件具有较好的弯曲耗能能力,增加钢管剪力键的GSS构件则可以提升抗弯承载力.装配式墩接头导致其整体性较弱,GS构件和GSS构件抗扭承载力小于RC构件.各构件在复合荷载作用下的剪扭相关关系接近规范中的1/4圆理论曲线,研究结果可以为灌浆套筒连接装配式墩在压弯剪扭复合作用下的抗震性能分析提供参考.
Keyword :
压弯剪扭 压弯剪扭 延性 延性 承载力 承载力 拟静力试验 拟静力试验 桥梁工程 桥梁工程 灌浆套筒连接 灌浆套筒连接 装配式墩 装配式墩
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GB/T 7714 | 林友勤 , 赖仕永 , 夏樟华 et al. 压弯剪扭复合作用下灌浆套筒装配式RC墩的抗震性能 [J]. | 湖南大学学报(自然科学版) , 2024 , 51 (03) : 182-192 . |
MLA | 林友勤 et al. "压弯剪扭复合作用下灌浆套筒装配式RC墩的抗震性能" . | 湖南大学学报(自然科学版) 51 . 03 (2024) : 182-192 . |
APA | 林友勤 , 赖仕永 , 夏樟华 , 王达荣 . 压弯剪扭复合作用下灌浆套筒装配式RC墩的抗震性能 . | 湖南大学学报(自然科学版) , 2024 , 51 (03) , 182-192 . |
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