高強(qiáng)鋼筋約束高強(qiáng)混凝土柱結(jié)構(gòu)性能試驗(yàn)研究
發(fā)布時(shí)間：2018-12-21 14:08
【摘要】：采用高強(qiáng)度材料是開(kāi)展節(jié)能減排工作、走可持續(xù)發(fā)展道路的重要途徑,高強(qiáng)鋼筋和高強(qiáng)混凝土的應(yīng)用能夠節(jié)省材料的使用,節(jié)約資源,具有顯著地經(jīng)濟(jì)效益。采用高強(qiáng)鋼筋約束高強(qiáng)混凝土一方面能夠提高約束混凝土的峰值應(yīng)力,提高試件的承載能力,另一方面能夠提高延性性能,防止試件突然破壞。目前,對(duì)高強(qiáng)鋼筋約束高強(qiáng)混凝土柱結(jié)構(gòu)性能的研究還不夠充分。本文通過(guò)試驗(yàn),研究了高強(qiáng)鋼筋約束高強(qiáng)混凝土柱的結(jié)構(gòu)性能。主要工作與成果如下:對(duì)13個(gè)配制高強(qiáng)鋼筋(縱筋采用HTB650,箍筋采用HTH800H)的高強(qiáng)混凝土(C60)柱進(jìn)行了軸心受壓試驗(yàn)。分析了箍筋直徑、箍筋間距、箍筋強(qiáng)度和體積配箍率等參數(shù)對(duì)高強(qiáng)鋼筋約束高強(qiáng)混凝土柱在軸心受壓時(shí)結(jié)構(gòu)性能的影響,研究了各參數(shù)對(duì)試件破壞形態(tài)、荷載-變形曲線、延性性能、縱筋峰值應(yīng)變、約束混凝土峰值應(yīng)力和峰值應(yīng)變的影響。提出了高強(qiáng)鋼筋約束高強(qiáng)混凝土柱軸壓受壓承載力計(jì)算公式,建議縱筋強(qiáng)度設(shè)計(jì)值取540MPa,箍筋強(qiáng)度設(shè)計(jì)值取660MPa。軸心受壓試驗(yàn)結(jié)果表明:與普通強(qiáng)度鋼筋約束高強(qiáng)混凝土試件相比,高強(qiáng)鋼筋約束高強(qiáng)混凝土對(duì)試件承載力和延性的改善作用更強(qiáng),鋼筋強(qiáng)度的提高能夠提高約束混凝土的峰值應(yīng)力和峰值應(yīng)變,且采用高強(qiáng)鋼筋的試件應(yīng)力-應(yīng)變曲線下降更加緩慢;高強(qiáng)鋼筋對(duì)約束混凝土峰值應(yīng)力、峰值應(yīng)變的提高程度和試件延性性能的改善與鋼筋對(duì)混凝土的約束作用強(qiáng)弱有關(guān),約束作用越強(qiáng),對(duì)峰值應(yīng)力、峰值應(yīng)變的提高和試件延性性能改善的效果越好;體積配箍率越大,鋼筋的約束作用越強(qiáng),當(dāng)體積配箍率相同時(shí),小直徑、小間距配筋的約束作用大于大直徑、大間距配筋;在一定的高強(qiáng)鋼筋約束作用下,縱筋在峰值荷載時(shí)可以達(dá)到其屈服應(yīng)變。對(duì)4個(gè)配制高強(qiáng)鋼筋(縱筋采用HTB650,箍筋采用HTH800H)的高強(qiáng)混凝土(C60)短柱進(jìn)行了低周反復(fù)加載試驗(yàn)。分析了剪跨比、縱筋強(qiáng)度、箍筋強(qiáng)度、箍筋直徑和體積配箍率等參數(shù)對(duì)高強(qiáng)鋼筋約束高強(qiáng)混凝土柱破壞形態(tài)、滯回特性、延性、極限位移角、耗能能力、箍筋應(yīng)變和縱筋應(yīng)變的影響。低周反復(fù)加載試驗(yàn)結(jié)果表明:與配有普通強(qiáng)度縱筋和普通強(qiáng)度箍筋的高強(qiáng)混凝土短柱相比,配有高強(qiáng)縱筋和高強(qiáng)箍筋的高強(qiáng)混凝土短柱具有較高的安全儲(chǔ)備;高強(qiáng)箍筋在試件達(dá)到峰值荷載后發(fā)揮作用明顯,能夠顯著改善試件的延性性能,提高試件抗倒塌能力;高強(qiáng)鋼筋可以解決高強(qiáng)混凝土短柱的小剪跨比、高強(qiáng)混凝土材料脆性所導(dǎo)致的延性差的問(wèn)題,即使在體積配箍率小于1.2%時(shí)也能夠滿足位移延性的要求;對(duì)于高強(qiáng)鋼筋約束高強(qiáng)混凝土短柱,用極限位移角來(lái)反映試件的延性性能更加的合理,而且在計(jì)算配箍特征值時(shí),需要對(duì)高強(qiáng)箍筋的屈服強(qiáng)度進(jìn)行折減。
[Abstract]:The use of high strength materials is an important way to carry out energy saving and emission reduction and sustainable development. The application of high strength steel bar and high strength concrete can save the use of materials, save resources and have remarkable economic benefits. On the one hand, the peak stress of the confined concrete can be increased and the bearing capacity of the specimen can be increased by using high strength reinforced concrete. On the other hand, the ductility of the specimen can be improved and the sudden damage of the specimen can be prevented. At present, the research on the performance of high-strength reinforced concrete columns is not enough. In this paper, the structural properties of high-strength reinforced concrete columns confined by high-strength steel bars are studied. The main work and results are as follows: 13 high strength concrete (C60) columns with high strength reinforcement (HTB650, stirrups and HTH800H for longitudinal reinforcement) are tested under axial compression. The influence of the parameters such as the diameter of stirrups, the spacing of stirrups, the strength of stirrups and the ratio of volume stirrups on the structural performance of high-strength reinforced concrete columns under axial compression is analyzed. The failure patterns and load-deformation curves of the specimens under axial compression are studied. Effects of ductility, peak strain of longitudinal reinforcement, peak stress and peak strain of confined concrete. A formula for calculating the bearing capacity of high-strength reinforced concrete columns under axial compression is presented. It is suggested that the design values of longitudinal reinforcement strength and stirrups strength should be 540MPa and 660MPa respectively. The results of axial compression test show that high strength reinforced concrete can improve the bearing capacity and ductility of the specimens better than that of the specimens confined by ordinary strength steel bars. The increase of reinforcement strength can increase the peak stress and strain of confined concrete, and the stress-strain curve of high strength steel bar decreases more slowly. The improvement of peak stress of high strength steel bar to confined concrete, the improvement of peak strain and ductility of specimen is related to the restraint action of steel bar on concrete. The stronger the restraint action is, the stronger the peak stress is. The higher the peak strain and the better the ductility of the specimen are; When the volume ratio of hoop is the same, the constraint effect of small diameter and small spacing reinforcement is larger than that of large diameter, and the constraint effect of small spacing reinforcement is larger than that of large diameter. Under the constraint of a certain high strength steel bar, the longitudinal steel bar can reach its yield strain under the peak load. Four high strength concrete (C60) short columns prepared with high strength steel bar (HTB650, stirrups with HTH800H) were subjected to low cycle repeated loading test. The failure mode, hysteretic property, ductility, ultimate displacement angle, energy dissipation capacity of high-strength reinforced concrete columns confined by shear span ratio, longitudinal reinforcement strength, stirrups diameter and volume hoop ratio are analyzed. Effects of stirrups strain and longitudinal strain. The results of low cycle repeated loading test show that the high strength concrete short columns with high strength longitudinal reinforcement and common strength stirrups have a higher safety reserve than the high strength concrete short columns with high strength longitudinal reinforcement and high strength stirrups. The high strength stirrups play a significant role after the specimen reaches the peak load, which can significantly improve the ductility of the specimen and the ability of the specimen to resist collapse. The high strength steel bar can solve the problem of small shear span ratio of high strength concrete short column and the poor ductility caused by brittleness of high strength concrete material, even when the volume hoop ratio is less than 1.2, it can meet the requirement of displacement ductility. It is more reasonable to use the limit displacement angle to reflect the ductility of the specimen for the short columns with high strength reinforced concrete confined by high strength steel bar, and it is necessary to reduce the yield strength of the high strength stirrups when calculating the characteristic value of the stirrups.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU375.3
本文編號(hào)：2389015
[Abstract]:The use of high strength materials is an important way to carry out energy saving and emission reduction and sustainable development. The application of high strength steel bar and high strength concrete can save the use of materials, save resources and have remarkable economic benefits. On the one hand, the peak stress of the confined concrete can be increased and the bearing capacity of the specimen can be increased by using high strength reinforced concrete. On the other hand, the ductility of the specimen can be improved and the sudden damage of the specimen can be prevented. At present, the research on the performance of high-strength reinforced concrete columns is not enough. In this paper, the structural properties of high-strength reinforced concrete columns confined by high-strength steel bars are studied. The main work and results are as follows: 13 high strength concrete (C60) columns with high strength reinforcement (HTB650, stirrups and HTH800H for longitudinal reinforcement) are tested under axial compression. The influence of the parameters such as the diameter of stirrups, the spacing of stirrups, the strength of stirrups and the ratio of volume stirrups on the structural performance of high-strength reinforced concrete columns under axial compression is analyzed. The failure patterns and load-deformation curves of the specimens under axial compression are studied. Effects of ductility, peak strain of longitudinal reinforcement, peak stress and peak strain of confined concrete. A formula for calculating the bearing capacity of high-strength reinforced concrete columns under axial compression is presented. It is suggested that the design values of longitudinal reinforcement strength and stirrups strength should be 540MPa and 660MPa respectively. The results of axial compression test show that high strength reinforced concrete can improve the bearing capacity and ductility of the specimens better than that of the specimens confined by ordinary strength steel bars. The increase of reinforcement strength can increase the peak stress and strain of confined concrete, and the stress-strain curve of high strength steel bar decreases more slowly. The improvement of peak stress of high strength steel bar to confined concrete, the improvement of peak strain and ductility of specimen is related to the restraint action of steel bar on concrete. The stronger the restraint action is, the stronger the peak stress is. The higher the peak strain and the better the ductility of the specimen are; When the volume ratio of hoop is the same, the constraint effect of small diameter and small spacing reinforcement is larger than that of large diameter, and the constraint effect of small spacing reinforcement is larger than that of large diameter. Under the constraint of a certain high strength steel bar, the longitudinal steel bar can reach its yield strain under the peak load. Four high strength concrete (C60) short columns prepared with high strength steel bar (HTB650, stirrups with HTH800H) were subjected to low cycle repeated loading test. The failure mode, hysteretic property, ductility, ultimate displacement angle, energy dissipation capacity of high-strength reinforced concrete columns confined by shear span ratio, longitudinal reinforcement strength, stirrups diameter and volume hoop ratio are analyzed. Effects of stirrups strain and longitudinal strain. The results of low cycle repeated loading test show that the high strength concrete short columns with high strength longitudinal reinforcement and common strength stirrups have a higher safety reserve than the high strength concrete short columns with high strength longitudinal reinforcement and high strength stirrups. The high strength stirrups play a significant role after the specimen reaches the peak load, which can significantly improve the ductility of the specimen and the ability of the specimen to resist collapse. The high strength steel bar can solve the problem of small shear span ratio of high strength concrete short column and the poor ductility caused by brittleness of high strength concrete material, even when the volume hoop ratio is less than 1.2, it can meet the requirement of displacement ductility. It is more reasonable to use the limit displacement angle to reflect the ductility of the specimen for the short columns with high strength reinforced concrete confined by high strength steel bar, and it is necessary to reduce the yield strength of the high strength stirrups when calculating the characteristic value of the stirrups.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU375.3
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