FRP組合梁試件靜力學(xué)性能試驗(yàn)研究
發(fā)布時(shí)間：2019-01-01 14:58
【摘要】：組合梁橋是建立在整體現(xiàn)澆式鋼筋混凝土與裝配式鋼筋混凝土新型橋梁形式,充分結(jié)合了兩種橋梁形式的特點(diǎn)。FRP組合梁橋采用FRP材料作為永久模板,在其模板上后澆混凝土,在減少勞動力,降低工程造價(jià),加快施工進(jìn)度方面有著積極的作用,但是兩者交界面的粘結(jié)強(qiáng)度是共同受力的基礎(chǔ)。第二章FRP材料與后澆混凝土疊合結(jié)構(gòu)與普通混凝土進(jìn)行一般抗彎試驗(yàn)破壞對比分析。得出FRP材料與后澆混凝土的疊合結(jié)構(gòu)較普通混凝土受力性能有明顯的改善,疊合結(jié)構(gòu)中抗彎承載力和撓度明顯高于普通混凝土試件,并且疊合結(jié)構(gòu)中以兩種材料剝離破壞后,混凝土被壓壞然而FRP材料未破壞,從而未充分發(fā)揮FRP材料抗拉強(qiáng)度高的特點(diǎn)為主,其原因?yàn)閷娱g粘結(jié)強(qiáng)度弱的結(jié)論。第三章抗剝離強(qiáng)度試驗(yàn)研究中在第二章結(jié)論的基礎(chǔ)上對兩者間交界面分別采用的不同的方式增加交界面粘結(jié)強(qiáng)度,采用粘粗砂法、環(huán)氧膠法、剪力鍵法以及綜合法對FRP材料粘結(jié)表面進(jìn)行處理,然后在模板內(nèi)后澆混凝土進(jìn)行交界面抗剝離試驗(yàn)研究,通過試驗(yàn)研究兩種材料交界面粘結(jié)破壞形式和特征,得出組合試件破壞形式主要有中部裂縫延伸引起的剝離破壞、斜裂縫延伸剝離破壞、試件混凝土端部剝離破壞、試件底部混凝土剝離破壞四種形式。同時(shí)考慮在混凝土中加入PVA纖維、玄武巖纖維、鋼絲網(wǎng)改善混凝土自身的受力性能來研究組合構(gòu)件對抗折強(qiáng)度的影響和交界面主要剝離破壞形式。增加組合試件交界面的粘結(jié)強(qiáng)度和改善混凝土的強(qiáng)度對試件的抗剝離強(qiáng)度和抗折強(qiáng)度均有明顯的提高。在FRP板采用綜合法為最佳的處理方式。第四章對GFRP箱形梁與后澆混凝土的組合結(jié)構(gòu)形式采用各種假定以簡化計(jì)算,通過彈性破壞和極限破壞形式下進(jìn)行計(jì)算分析,為組合梁的設(shè)計(jì)提供理論基礎(chǔ)。第五章中采用GFRP箱形管與后澆混凝土模擬GFRP箱形梁與混凝土組合梁結(jié)構(gòu)進(jìn)行試驗(yàn)分析,分別制作箱形梁頂面采用綜合法處理并在混凝土中植入鋼絲網(wǎng)并在混凝土加入玄武巖纖維和未處理的組合結(jié)構(gòu)試件,對試件進(jìn)行抗折試驗(yàn),根據(jù)兩種試件的試驗(yàn)過程與破壞特征,可知純GFRP箱形梁在荷載作用下會產(chǎn)生較大的變形,未能發(fā)揮混凝土抗壓強(qiáng)度高和GFRP材料抗拉強(qiáng)度高的特點(diǎn),主要由于GFRP材料抗剪強(qiáng)度和GFRP箱形梁剛度低的原因,同時(shí)提出增加GFRP箱形梁抗剪強(qiáng)度和抗彎剛度的建議。
[Abstract]:Composite beam bridge is a new type of bridge built on integral cast-in-place reinforced concrete and prefabricated reinforced concrete, which fully combines the characteristics of two kinds of bridge forms. FRP composite beam bridge uses FRP material as permanent formwork and post-pouring concrete on its formwork. It plays an active role in reducing labor force, reducing project cost and speeding up construction progress, but the bond strength of the interface between the two is the basis of common force. In the second chapter, the failure analysis of the composite structure of FRP and post-cast concrete is compared with that of ordinary concrete under general flexural test. The results show that the composite structure of FRP and post-cast-in-situ concrete has better mechanical performance than ordinary concrete, and the flexural capacity and deflection of the composite structure are obviously higher than that of the ordinary concrete specimen, and the composite structure is stripped and destroyed by two kinds of materials. Concrete is crushed but FRP material is not destroyed, so the high tensile strength of FRP material is not fully brought into play, which is due to the conclusion that interlaminar bond strength is weak. In the third chapter, on the basis of the conclusion of the second chapter, the bonding strength of the interface is increased in different ways, and the bonding strength of the interface is increased by the method of bonded coarse sand and epoxy adhesive. Shear bond method and comprehensive method were used to treat the bonded surface of FRP material, and then the interfacial debonding resistance of post-cast concrete in the formwork was studied. The failure forms and characteristics of interfacial bond between the two materials were studied through experiments. It is concluded that the failure forms of composite specimens mainly include peeling failure caused by crack extension in middle part, delamination failure by slant crack extension, peeling failure at the end of concrete specimen and peeling failure of concrete at the bottom of the specimen. At the same time, PVA fiber, basalt fiber and steel wire mesh were added to the concrete to improve the mechanical properties of the concrete to study the influence of the composite members on the flexural strength and the main peeling failure form of the interface. Increasing the bond strength at the interface of the composite specimens and improving the strength of concrete can obviously improve the peeling strength and the flexural strength of the specimens. Comprehensive method is the best way to deal with FRP board. In chapter 4, various assumptions are used to simplify the calculation of the composite structure of GFRP box beam and post-cast-in-place concrete. Through the calculation and analysis under the form of elastic failure and ultimate failure, the theoretical basis is provided for the design of composite beam. In the fifth chapter, the structure of GFRP box beam and concrete composite beam is simulated by GFRP box tube and post-pouring concrete. The top surface of box beam was treated by comprehensive method and steel wire mesh was implanted in concrete. The specimens with basalt fiber and untreated composite structure were added to the concrete, and the flexural tests were carried out on the specimens. According to the test process and failure characteristics of two kinds of specimens, it can be concluded that the pure GFRP box beam will produce large deformation under the action of load, which fails to give full play to the characteristics of high compressive strength of concrete and high tensile strength of GFRP material. It is mainly due to the low shear strength of GFRP material and the low stiffness of GFRP box beam, and the suggestion to increase the shear strength and flexural stiffness of GFRP box beam is put forward.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U446
本文編號：2397720
[Abstract]:Composite beam bridge is a new type of bridge built on integral cast-in-place reinforced concrete and prefabricated reinforced concrete, which fully combines the characteristics of two kinds of bridge forms. FRP composite beam bridge uses FRP material as permanent formwork and post-pouring concrete on its formwork. It plays an active role in reducing labor force, reducing project cost and speeding up construction progress, but the bond strength of the interface between the two is the basis of common force. In the second chapter, the failure analysis of the composite structure of FRP and post-cast concrete is compared with that of ordinary concrete under general flexural test. The results show that the composite structure of FRP and post-cast-in-situ concrete has better mechanical performance than ordinary concrete, and the flexural capacity and deflection of the composite structure are obviously higher than that of the ordinary concrete specimen, and the composite structure is stripped and destroyed by two kinds of materials. Concrete is crushed but FRP material is not destroyed, so the high tensile strength of FRP material is not fully brought into play, which is due to the conclusion that interlaminar bond strength is weak. In the third chapter, on the basis of the conclusion of the second chapter, the bonding strength of the interface is increased in different ways, and the bonding strength of the interface is increased by the method of bonded coarse sand and epoxy adhesive. Shear bond method and comprehensive method were used to treat the bonded surface of FRP material, and then the interfacial debonding resistance of post-cast concrete in the formwork was studied. The failure forms and characteristics of interfacial bond between the two materials were studied through experiments. It is concluded that the failure forms of composite specimens mainly include peeling failure caused by crack extension in middle part, delamination failure by slant crack extension, peeling failure at the end of concrete specimen and peeling failure of concrete at the bottom of the specimen. At the same time, PVA fiber, basalt fiber and steel wire mesh were added to the concrete to improve the mechanical properties of the concrete to study the influence of the composite members on the flexural strength and the main peeling failure form of the interface. Increasing the bond strength at the interface of the composite specimens and improving the strength of concrete can obviously improve the peeling strength and the flexural strength of the specimens. Comprehensive method is the best way to deal with FRP board. In chapter 4, various assumptions are used to simplify the calculation of the composite structure of GFRP box beam and post-cast-in-place concrete. Through the calculation and analysis under the form of elastic failure and ultimate failure, the theoretical basis is provided for the design of composite beam. In the fifth chapter, the structure of GFRP box beam and concrete composite beam is simulated by GFRP box tube and post-pouring concrete. The top surface of box beam was treated by comprehensive method and steel wire mesh was implanted in concrete. The specimens with basalt fiber and untreated composite structure were added to the concrete, and the flexural tests were carried out on the specimens. According to the test process and failure characteristics of two kinds of specimens, it can be concluded that the pure GFRP box beam will produce large deformation under the action of load, which fails to give full play to the characteristics of high compressive strength of concrete and high tensile strength of GFRP material. It is mainly due to the low shear strength of GFRP material and the low stiffness of GFRP box beam, and the suggestion to increase the shear strength and flexural stiffness of GFRP box beam is put forward.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U446
【參考文獻(xiàn)】
相關(guān)期刊論文 前4條
1 葉列平,崔衛(wèi),岳清瑞,胡孔國;碳纖維布加固混凝土構(gòu)件正截面受彎承載力分析[J];建筑結(jié)構(gòu);2001年03期
2 趙軍;趙海燕;;預(yù)應(yīng)力混凝土疊合板的應(yīng)用與研究進(jìn)展[J];山西建筑;2008年20期
3 葉明新;;模板支撐體系安全管理分析[J];江西建材;2014年02期
4 葉列平;馮鵬;;FRP在工程結(jié)構(gòu)中的應(yīng)用與發(fā)展[J];土木工程學(xué)報(bào);2006年03期
，本文編號：2397720
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