玄武巖纖維復(fù)合筋材在基坑支護(hù)樁中的應(yīng)用
發(fā)布時間：2018-11-06 20:54
【摘要】：玄武巖纖維復(fù)合材料(BFRP)具有抗拉強度高、耐腐蝕性和化學(xué)穩(wěn)定性、高熱穩(wěn)定性和高絕緣性、成本低廉等優(yōu)點。同時BFRP筋的熱膨脹系數(shù)與混凝土相近,確保了混凝土與筋材的同步變形。在基坑支護(hù)工程中常采用的支護(hù)樁,若通過研究提出BFRP支護(hù)樁設(shè)計理論,用BFRP筋替代其中部分或全部鋼筋,充分發(fā)揮其經(jīng)濟(jì)及技術(shù)優(yōu)勢,應(yīng)用前景將十分廣泛。論文通過室內(nèi)試驗,研究了BFRP筋與混凝土之間的粘結(jié)性能,獲得了BFRP筋混凝土結(jié)構(gòu)設(shè)計的重要參數(shù)。通過類比GFRP筋的混凝土結(jié)構(gòu)設(shè)計方法初步得出BFRP筋混凝土結(jié)構(gòu)設(shè)計方法。對BFRP筋混凝土圓形截面正截面受彎構(gòu)件和板件進(jìn)行了室內(nèi)試驗,通過不同的配筋方式和配筋率對構(gòu)件的承載力和變形性能進(jìn)行測試,并運用數(shù)值模擬對室內(nèi)試驗結(jié)果進(jìn)行了驗證。最后綜合試驗數(shù)據(jù)對BFRP筋材混凝土構(gòu)件的設(shè)計方法進(jìn)行了修正。對實際工程中BFRP筋混凝土支護(hù)樁進(jìn)行了配筋設(shè)計,并進(jìn)行了樁身變形及主筋受力的現(xiàn)場監(jiān)測,驗證了BFRP筋混凝土支護(hù)樁的實用性及有效性。論文研究表明,BFRP筋材與混凝土的粘結(jié)性能良好,粘接強度范圍約14～29MPa。采用了2種不同直徑的BFRP筋材和3種配筋率進(jìn)行BFRP樁室內(nèi)試驗,結(jié)果表明BFRP樁承載能力隨配筋率的提高而提高,且當(dāng)筋材直徑相同時配筋率越高構(gòu)件承載力越高,當(dāng)配筋率相同時筋材直徑越小構(gòu)件承載力越高。BFRP混凝土板采用了 4種不同直徑的BFRP筋材和3種配筋間距,結(jié)果表明BFRP混凝土板承載力隨配筋率的增大而提高,但配筋率的提升并沒有使承載力有明顯提升。數(shù)值模擬結(jié)果與試驗結(jié)果吻合較好,內(nèi)部筋材的受力分布與預(yù)期相符合。利用試驗和數(shù)值分析結(jié)果對BFRP混凝土構(gòu)件承載力計算公式進(jìn)行了修正,得出了公式的調(diào)整系數(shù)β為2.5。對比實際工程中BFRP筋混凝土支護(hù)樁和鋼筋混凝土支護(hù)樁的變形和應(yīng)力監(jiān)測結(jié)果,BFRP筋混凝土支護(hù)樁變形稍大于鋼筋混凝土樁,且主筋受力稍小,但結(jié)構(gòu)整體穩(wěn)定,達(dá)到了支護(hù)效果,證實了BFRP筋應(yīng)用于基坑支護(hù)樁的安全性和可靠性。論文研究提出了 BFRP支護(hù)樁設(shè)計方法及設(shè)計參數(shù),通過工程實例驗證了BFRP支護(hù)樁的實用性,建議在更多巖土工程中推廣應(yīng)用。
[Abstract]:Basalt fiber composite (BFRP) has the advantages of high tensile strength, corrosion resistance and chemical stability, high thermal stability, high insulation and low cost. At the same time, the thermal expansion coefficient of BFRP reinforcement is close to that of concrete, which ensures the synchronous deformation of concrete and steel bar. If the design theory of BFRP supporting pile is put forward and some or all of the reinforcing bars are replaced by BFRP bars, the application prospect will be very extensive if the supporting pile which is often used in foundation pit support works takes full play of its economic and technical advantages. In this paper, the bond behavior between BFRP bars and concrete is studied through laboratory tests, and the important design parameters of concrete structures with BFRP tendons are obtained. The design method of BFRP reinforced concrete structure is preliminarily obtained by analogy with the concrete structure design method of GFRP bars. In this paper, the flexural members and plates with circular section of BFRP reinforced concrete are tested in laboratory, and the bearing capacity and deformation performance of the members are tested by different reinforcement methods and reinforcement ratio. The results of indoor tests are verified by numerical simulation. Finally, the design method of BFRP reinforced concrete members is modified by synthesizing test data. The reinforcement design of concrete supporting pile with BFRP reinforcement in actual engineering is carried out, and the deformation of pile body and the stress of main reinforcement are monitored on the spot, which verifies the practicability and validity of concrete supporting pile with BFRP reinforcement. The results show that the bond strength of BFRP bar and concrete is good, and the bonding strength range is about 1429MPa. Two kinds of BFRP bars with different diameters and three ratios of reinforcement were used to carry out the indoor test of BFRP pile. The results show that the bearing capacity of BFRP pile increases with the increase of reinforcement ratio, and the higher the reinforcement ratio is, the higher the bearing capacity of the members is when the diameter of the reinforcement is the same. When the reinforcement ratio is the same, the bearing capacity of BFRP concrete slab with smaller diameter is higher. Four kinds of BFRP bars with different diameters and three kinds of reinforcement spacing are used in BFRP concrete slab. The results show that the bearing capacity of BFRP concrete slab increases with the increase of reinforcement ratio. However, the reinforcement ratio does not increase the bearing capacity. The numerical simulation results are in good agreement with the experimental results. The formula for calculating the bearing capacity of BFRP concrete members is modified by using the results of test and numerical analysis, and the adjustment coefficient 尾 of the formula is obtained to be 2.5. Compared with the results of deformation and stress monitoring of BFRP reinforced concrete pile and reinforced concrete supporting pile in actual engineering, the deformation of BFRP reinforced concrete supporting pile is slightly larger than that of reinforced concrete pile, and the stress of the main reinforcement is slightly small, but the structure is stable as a whole. The safety and reliability of BFRP reinforcement applied in foundation pit supporting pile are confirmed. The design method and design parameters of BFRP supporting pile are studied and put forward in this paper. The practicability of BFRP supporting pile is verified by an engineering example and it is suggested that it should be popularized and applied in more geotechnical engineering.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU753.3
本文編號：2315444
[Abstract]:Basalt fiber composite (BFRP) has the advantages of high tensile strength, corrosion resistance and chemical stability, high thermal stability, high insulation and low cost. At the same time, the thermal expansion coefficient of BFRP reinforcement is close to that of concrete, which ensures the synchronous deformation of concrete and steel bar. If the design theory of BFRP supporting pile is put forward and some or all of the reinforcing bars are replaced by BFRP bars, the application prospect will be very extensive if the supporting pile which is often used in foundation pit support works takes full play of its economic and technical advantages. In this paper, the bond behavior between BFRP bars and concrete is studied through laboratory tests, and the important design parameters of concrete structures with BFRP tendons are obtained. The design method of BFRP reinforced concrete structure is preliminarily obtained by analogy with the concrete structure design method of GFRP bars. In this paper, the flexural members and plates with circular section of BFRP reinforced concrete are tested in laboratory, and the bearing capacity and deformation performance of the members are tested by different reinforcement methods and reinforcement ratio. The results of indoor tests are verified by numerical simulation. Finally, the design method of BFRP reinforced concrete members is modified by synthesizing test data. The reinforcement design of concrete supporting pile with BFRP reinforcement in actual engineering is carried out, and the deformation of pile body and the stress of main reinforcement are monitored on the spot, which verifies the practicability and validity of concrete supporting pile with BFRP reinforcement. The results show that the bond strength of BFRP bar and concrete is good, and the bonding strength range is about 1429MPa. Two kinds of BFRP bars with different diameters and three ratios of reinforcement were used to carry out the indoor test of BFRP pile. The results show that the bearing capacity of BFRP pile increases with the increase of reinforcement ratio, and the higher the reinforcement ratio is, the higher the bearing capacity of the members is when the diameter of the reinforcement is the same. When the reinforcement ratio is the same, the bearing capacity of BFRP concrete slab with smaller diameter is higher. Four kinds of BFRP bars with different diameters and three kinds of reinforcement spacing are used in BFRP concrete slab. The results show that the bearing capacity of BFRP concrete slab increases with the increase of reinforcement ratio. However, the reinforcement ratio does not increase the bearing capacity. The numerical simulation results are in good agreement with the experimental results. The formula for calculating the bearing capacity of BFRP concrete members is modified by using the results of test and numerical analysis, and the adjustment coefficient 尾 of the formula is obtained to be 2.5. Compared with the results of deformation and stress monitoring of BFRP reinforced concrete pile and reinforced concrete supporting pile in actual engineering, the deformation of BFRP reinforced concrete supporting pile is slightly larger than that of reinforced concrete pile, and the stress of the main reinforcement is slightly small, but the structure is stable as a whole. The safety and reliability of BFRP reinforcement applied in foundation pit supporting pile are confirmed. The design method and design parameters of BFRP supporting pile are studied and put forward in this paper. The practicability of BFRP supporting pile is verified by an engineering example and it is suggested that it should be popularized and applied in more geotechnical engineering.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU753.3
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