高軸壓比鋼骨高強(qiáng)混凝土角柱抗震性能試驗(yàn)研究
發(fā)布時(shí)間：2018-10-17 17:08
【摘要】：高層建筑的底層柱往往受到高軸壓和雙向壓彎剪的共同作用，這對(duì)底層柱的抗震性能有較高的要求，采用鋼骨高強(qiáng)混凝土柱是提升底層柱抗震性能的有效措施之一。 為了模擬鋼骨高強(qiáng)混凝土角柱在軸壓和雙向彎矩作用下的非線性特性，本文開發(fā)了基于纖維模型的非線性分析程序SECTION。分析已有試驗(yàn)結(jié)果發(fā)現(xiàn)要準(zhǔn)確模擬鋼骨高強(qiáng)混凝土柱的壓彎性能必須考慮箍筋對(duì)高強(qiáng)混凝土的約束作用。收集了44組不同截面尺寸的軸心受壓高強(qiáng)混凝土柱的試驗(yàn)結(jié)果，試件混凝土強(qiáng)度在C50-C110范圍，配箍特征值λ在0.01至0.27范圍，通過統(tǒng)計(jì)分析提出了箍筋約束高強(qiáng)混凝土的峰值應(yīng)力fcc、對(duì)應(yīng)應(yīng)變?chǔ)與c與配箍特征值λ的關(guān)系曲線，建議了箍筋約束高強(qiáng)混凝土的應(yīng)力－應(yīng)變關(guān)系模型。為了驗(yàn)證模型的可靠性，完成了3個(gè)箍筋約束高強(qiáng)混凝土柱的受壓試驗(yàn)，獲得了大尺寸高強(qiáng)混凝土柱的荷載－應(yīng)變?nèi)�，完成了本文試驗(yàn)試件與其他典型高強(qiáng)RC軸心受壓柱試件的數(shù)值模擬，模擬結(jié)果與試驗(yàn)結(jié)果比較接近。證明建議的模型比較準(zhǔn)確，可以供箍筋約束高強(qiáng)混凝土數(shù)值分析參考使用。 完成了7個(gè)高軸壓比鋼骨高強(qiáng)混凝土角柱的壓彎試驗(yàn)，研究了含鋼率、鋼骨截面形狀、加載角度、鋼骨布置夾角對(duì)其抗震性能的影響。試驗(yàn)結(jié)果表明，高軸壓比下鋼骨高強(qiáng)混凝土柱正向或斜向受力時(shí)均為壓彎作用下的受彎破壞。試件達(dá)到峰值荷載的變形能力滿足規(guī)范要求，有良好的變形能力。柱的含鋼率較小時(shí)對(duì)試件延性的提升不明顯。十字鋼骨截面板件寬厚比小的構(gòu)件抗震性能更好。試件斜向壓彎下的承載力和耗能能力略低于正向壓彎下的性能。十字鋼骨在鋼筋混凝土柱中斜向放置后，對(duì)于承載能力的影響不明顯，但后期承載力下降較快。 采用SECTION和OpenSees軟件完成了對(duì)鋼骨高強(qiáng)混凝土角柱的數(shù)值模擬，結(jié)果表明用建議的ZSA模型模擬箍筋約束混凝土有良好的精度。本文選取不同的加載角度用OpenSees軟件進(jìn)行了試算，，計(jì)算結(jié)果表明加載角度對(duì)斜向受力鋼骨高強(qiáng)混凝土柱的承載力影響較大。
[Abstract]:The bottom columns of high-rise buildings are often subjected to the combined action of high axial compression and biaxial bending shear, which requires high seismic performance of the bottom columns. The use of high strength steel reinforced concrete columns is one of the effective measures to improve the seismic performance of the bottom columns. In order to simulate the nonlinear behavior of steel reinforced high strength concrete corner columns under axial compression and biaxial bending moment, a nonlinear analysis program SECTION. based on fiber model is developed in this paper. It is found that in order to accurately simulate the compression and bending behavior of steel reinforced high strength concrete columns, the confinement of stirrups on high strength concrete must be considered. The test results of 44 groups of axially compressed high strength concrete columns with different cross-section sizes are collected. The concrete strength of the specimens is in the range of C50-C110, and the characteristic value of the hoop is between 0.01 and 0.27. Through statistical analysis, the relationship curve between strain 蔚 cc and stirrups eigenvalue 位 of the peak stress of stirrups confined high strength concrete (fcc,) is proposed, and the stress-strain relationship model of stirrups confined high strength concrete is suggested. In order to verify the reliability of the model, the compression tests of three stirrups confined high strength concrete columns have been completed, and the load-strain curves of large size high strength concrete columns have been obtained. The numerical simulation of the specimens tested in this paper and other typical high strength RC axial compression columns is completed. The simulation results are close to the experimental results. It is proved that the proposed model is more accurate and can be used as a reference for numerical analysis of high strength concrete confined by stirrups. In this paper, seven high strength concrete corner columns with high axial compression ratio have been tested, and the effects of steel content ratio, steel section shape, loading angle and angle of steel bone arrangement on their seismic performance have been studied. The experimental results show that the bending failure of steel reinforced high strength concrete columns under high axial compression ratio is either positive or oblique. The deformation capacity of the specimen to peak load meets the requirements of the code and has good deformation capacity. The increase of ductility of the specimen is not obvious when the steel content of the column is small. The cross-section plate has better seismic performance than the small member. The bearing capacity and energy dissipation capacity of the specimens under oblique compression and bending are slightly lower than those under positive compression. After the cross steel is placed in the reinforced concrete column, the influence on the bearing capacity is not obvious, but the bearing capacity decreases rapidly in the later stage. The numerical simulation of high strength steel reinforced concrete corner columns is carried out by using SECTION and OpenSees software. The results show that the proposed ZSA model has good precision in simulating confined concrete with stirrups. In this paper, different loading angles are selected and calculated by OpenSees software. The results show that the loading angle has a great influence on the bearing capacity of steel reinforced high-strength concrete columns with oblique force.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU352.11;TU398.9
本文編號(hào)：2277369
[Abstract]:The bottom columns of high-rise buildings are often subjected to the combined action of high axial compression and biaxial bending shear, which requires high seismic performance of the bottom columns. The use of high strength steel reinforced concrete columns is one of the effective measures to improve the seismic performance of the bottom columns. In order to simulate the nonlinear behavior of steel reinforced high strength concrete corner columns under axial compression and biaxial bending moment, a nonlinear analysis program SECTION. based on fiber model is developed in this paper. It is found that in order to accurately simulate the compression and bending behavior of steel reinforced high strength concrete columns, the confinement of stirrups on high strength concrete must be considered. The test results of 44 groups of axially compressed high strength concrete columns with different cross-section sizes are collected. The concrete strength of the specimens is in the range of C50-C110, and the characteristic value of the hoop is between 0.01 and 0.27. Through statistical analysis, the relationship curve between strain 蔚 cc and stirrups eigenvalue 位 of the peak stress of stirrups confined high strength concrete (fcc,) is proposed, and the stress-strain relationship model of stirrups confined high strength concrete is suggested. In order to verify the reliability of the model, the compression tests of three stirrups confined high strength concrete columns have been completed, and the load-strain curves of large size high strength concrete columns have been obtained. The numerical simulation of the specimens tested in this paper and other typical high strength RC axial compression columns is completed. The simulation results are close to the experimental results. It is proved that the proposed model is more accurate and can be used as a reference for numerical analysis of high strength concrete confined by stirrups. In this paper, seven high strength concrete corner columns with high axial compression ratio have been tested, and the effects of steel content ratio, steel section shape, loading angle and angle of steel bone arrangement on their seismic performance have been studied. The experimental results show that the bending failure of steel reinforced high strength concrete columns under high axial compression ratio is either positive or oblique. The deformation capacity of the specimen to peak load meets the requirements of the code and has good deformation capacity. The increase of ductility of the specimen is not obvious when the steel content of the column is small. The cross-section plate has better seismic performance than the small member. The bearing capacity and energy dissipation capacity of the specimens under oblique compression and bending are slightly lower than those under positive compression. After the cross steel is placed in the reinforced concrete column, the influence on the bearing capacity is not obvious, but the bearing capacity decreases rapidly in the later stage. The numerical simulation of high strength steel reinforced concrete corner columns is carried out by using SECTION and OpenSees software. The results show that the proposed ZSA model has good precision in simulating confined concrete with stirrups. In this paper, different loading angles are selected and calculated by OpenSees software. The results show that the loading angle has a great influence on the bearing capacity of steel reinforced high-strength concrete columns with oblique force.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU352.11;TU398.9
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