肖岩
基于性能抗震设计、高性能新材料结构应用综合研究
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- 姓名:肖岩
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学术头衔:
博士生导师
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学科领域:
土木建筑工程其他学科
- 研究兴趣:基于性能抗震设计、高性能新材料结构应用综合研究
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9
【期刊论文】COMPRESSIVE BEHAVIOR OF CONCRETE CONFINED BY CARBON FIBER COMPOSITE JACKETS
肖岩, By Y. Xiao and H. Wu
JOURNAL OF MATERIALS IN CIVIL ENGINEERING/MAY 2000,-0001,():
-1年11月30日
This paper describes axial compression test results of 27 concrete cylinders confined by carbon fiber reinforced polymer composite jackets. The experimental parameters include plain concrete compressive strength and the thickness of the composite jacket. It is found that the carbon fiber composite jacketing can significantly increase the compressive strength and ductility of concrete. The test results indicate that concrete strength and confinement modulus, defined as the ratio of transverse confinement stress and transverse strain, are the most influential factors affecting the stress-strain behavior of confined concrete. The failure of the confined concrete was dominated by the rupture of the jacket at an average strain much smaller than the ultimate strain obtained from tension tests of flat coupons. In order to describe the main mechanical features of the confined concrete, a simple bilinear stress-strain model is suggested based on the theory of elasticity and minimum number of empirical equations determined from the tests. The simple model is shown to compare well with test results from previous studies by other researchers.
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【期刊论文】Seismic Assessment and Retrofit of Bridge Column Footings
肖岩, by Yan Xiao, M. J. Nigel Priestley, and Frieder Seible
ACU Structural Journal, V. 93, No.1 January-February 1996.,-0001,():
-1年11月30日
This paper describees theoretical and experimental studies related to seismic assessment and retrofit of bridge columst footings. One "as built" model columm footing and three retrofit model colunzn footings have been tested under sinmulated seiatnic actions. Test results of the "'as built" footing indicated that columu/footing joint shear failure is a potential danger to existitng bridge, structures. Test results also indicated that if there is no dependable tensile capacity in the pile/footing connectiosz, a rocking behaveior may dominare pier resporzse, minimizing damage to footing and column. Model column footitzgs retrofit using current retrofit standards depeloped relatively stable hysteretic responses up to moderate ductility levels. However. experinzental obserations and theoretical analyses based on a strut-and-tie model and yield-line theory indicated that with current footing retrofit design, which lacks the consideration for joint shear design, the reiinforced concrete overlay may not develop a fully effective postcracking tnechanism. Improved retrofit details including long dowels to insure developnent of an effective joint shear-resistitlg nlechatlism are proposed and verified hy experimental results.
bridges (, structures), , columns (, supports), , earthquake-resistant structures, failure, footings: shear properties, yield-line theory.,
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【期刊论文】SEISMIC PERFORMANCE OF HIGH-STRENGTH CONCRETE COLUMNS
肖岩, By Yan Xiao, , Member, ASCE, and Armen Martirossyan, Student Member
JOURNAL OF STRUCTURAL ENGINEERING/MARCH 1998/241,-0001,():
-1年11月30日
This paper presents the experimental results of six scaled high-strength concrete columns with concrete compressive strengths of 76-86 MP& Primary experimental parameters include axial loads ranging from 10 to 20% of column axial load-carrying capacity based on concrete gross section; longitudinal steel ratios of 2.46 to 3.53% of the gross sectional area; and volumetric ratios of transverse reinforcement ranging from 1.63 to 3.67%. Model columns with transverse reinforcement designed following the seismic provisions of current code developed sufficient ductility, with displacement ductility factors equal to or exceeding 6.0. The model columns designed with 50% of the transverse reinforcement required by current code also developed sufficient ductility when the axial load was 10% of its axial load-carrying capacity. Lateral load-carrying capacities of all the columns exceeded the flexural capacities calculated based on the equivalent concrete stress block used in current design code. Seismic shear strength of high-strength concrete columns was also examined, based on the test results and analytical approaches.
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【期刊论文】DEVELOPMENT OF A NETWORK PLATFORM FOR REMOTE HYBRID DYNAMIC TESTING
肖岩, Yan XIAO , ; Qing HU , ; Yurong GUO ; Pingsheng ZHU ; Weijian YI
Vancouver, B.C., Canada August 1-6, 2004 Paper No.3048,-0001,():
-1年11月30日
This paper presents a network platform developed for remote pseudo dynamic testing of substructures and structural elements, and discusses the results of trial tests. The network platform, NetSLab, was developed based on client/server concept along with a proposed data model and communication protocols. The platform is capable of transferring control and feedback data among remote structural testing laboratories or computers connected by Internet. Several concepts were introduced to realize the platform and to provide relatively easier and friendlier interface for applications and further development by users. Trial tests were successfully carried out at the Hunan University, China and the University of Southern California, USA. In the trial tests, models simulating bridge piers or piles were subjected to recorded earthquake ground motions controlled remotely over the Internet through the platform.
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【期刊论文】EXPERIMENTAL STUDIES OF CONFINED CONCRETE FILLED STEEL TUBULAR (CCFT) COLUMNS
肖岩, Yan XIAO , ; Wenhui HE ; Xiaoyong MAO ; Kang-Kyu CHOI ; Shouping SHANG ; Yurong GUO
Vancouver, B.C., Canada August 1-6, 2004 Paper No.681,-0001,():
-1年11月30日
This paper introduces an innovative concrete filled steel tubular (CFT) column structure for improved seismic design of steel and concrete composite structures. Based on fundamental mechanics, the design concept is aimed at controlling the local buckling of the steel tube and confining the concrete in the potential plastic hinge zones of a CFT column. To achieve this, several efficient details of transverse confinement have been examined through experimental testing. The new type of CFT column, named as CCFT, is expected to overcome many disadvantages of the conventional CFT column and to provide the ideal choice for structural design of tall buildings in seismic regions. Experimental tests validated the concept of the CCFT.
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肖岩
土木工程学报,2004,37(4):8~12,-0001,():
-1年11月30日
回顾了套管钢筋混凝土柱的发展过程。在套管钢筋混凝土柱中,套管用作柱中的横向增强,主要起约束和抗剪作用。Thomii和作者等人在1985年首次提出套管柱的概念,并验证了套管柱能够有效防止柱的剪切破坏并显著提高柱的延性。随后,这一概念被推广到利用焊接钢管和纤维增强塑料外包壳加固既存钢筋混凝土柱。本文还展望了使用纤维增强塑料套管进行新建柱设计的研究。
套管钢筋混凝土柱, 钢管混凝土柱, 约束, 抗震设计, 延性, 纤维增强塑料
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【期刊论文】PREFABRICATED COMPOSITE JACKETING OF RC COLUMNS FOR ENHANCED SHEAR STRENGTH
肖岩, By Y. Xiao, , Member, ASCE, H. Wu, and G. R. Martin
JOURNAL OF STRUCTURAL ENGINEERING/MARCH 1999,-0001,():
-1年11月30日
The effectiveness of prefabricated composite jacketing to retrofit existing circular reinforced concrete (RC) bridge columns for enhanced seismic shear strength is described in this paper. The jackets consist of multilayer prefabricated glass fiber reinforced composite shells adhered together. Three half-scale circular columns were tested under cyclic shear in double curvature and constant axial load. One column was tested in the "as built" condition to investigate the shear failure mode of columns designed based on pre-1971 codes. Two other columns were tested after being retrofitted using prefabricated composite jackets. The as built column suffered shear failure at low displacement ductility. The retrofitted columns developed significantly improved hysteretic responses with stable hysteresis loops even at displacement ductility levels as high as 10.0 corresponding to drift ratios exceeding 5.2%. Method for retrofit design using prefabricated composite jacketing is also provided and validated by the test results.
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【期刊论文】Retrofit of Reinforced Concrete Columns Using Partially Stiffened Steel Jackets
肖岩, Yan Xiao, M.ASCE, , and Hui Wu
JOURNAL OF STRUCTURAL ENGINEERING ASCE/JUNE 2003,-0001,():
-1年11月30日
This paper introduces an improved steel jacketing method to retrofit reinforced concrete columns with a square or rectangular section for enhanced strength and improved ductility. To retrofit an existing column, relatively thin steel plates were welded to form a rectilinear jacket for shear strength enhancement, and then additional confinement elements stiffeners! with various types of desired configurations were welded to the potential plastic hinge regions to ensure a ductile behavior. A rational retrofit design procedure was suggested and evaluated through an experimental program. Five 1/3 scale model columns were tested under constant axial load of 0.3Ag f c8 and cyclic lateral force in a double-curvature condition. Test results validated the efficiency of the partially stiffened rectilinear steel jacketing, which not only prevented brittle shear failure but also greatly improved the ductility of the column with achieving an ultimate drift ratio of more than 8%. Besides the structural merits, the partially stiffened rectilinear steel jackets also have appealing architectural features.
Concrete columns, Confinement, Ductility, Failure, Flexural strength, Shear strength, Retrofitting.,
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【期刊论文】SEISMIC RETROFIT OF RC CIRCULAR COLUMNS USING PREFABRICATED COMPOSITE JACKETING
肖岩, By Yan Xiao, , Member, ASCE, and Rui Ma
JOURNAL OF STRUCTURAL ENGINEERING/OCTOBER 1997/1357,-0001,():
-1年11月30日
This paper describes experimental and theoretical studies on seismic retrofit of reinforced concrete circular columns with poor lap-splice details using prefabricated composite jacketing. Three 1:2 scale model columns have been tested. One column was tested under the condition of "as built" and two others were tested after being retrofitted using prefabricated composite jacketing. The as-built column suffered brittle failure due to the deterioration of lap-spliced longitudinal reinforcement without developing its flexural capacity or any ductility. The retrofitted columns showed significant improvement in seismic performance. The failed as-built column was retested after being repaired. The repaired column also demonstrated significant improvement in ductility. An analytical model, which takes into consideration the bond-slip deterioration of lap-spliced longitudinal bars, has been developed for seismic assessment and retrofit design.
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