灌芯裝配式混凝土大板剪力墻抗震性能試驗(yàn)研究與有限元模擬
發(fā)布時(shí)間：2018-12-18 01:34
【摘要】：住宅產(chǎn)業(yè)化是解決人口、資源和環(huán)境之間矛盾的重要措施,住宅產(chǎn)業(yè)化的核心部分即為裝配式混凝土結(jié)構(gòu)。當(dāng)前,裝配式混凝土構(gòu)件鋼筋的連接技術(shù)已經(jīng)成為影響裝配式混凝土結(jié)構(gòu)應(yīng)用的關(guān)鍵技術(shù)瓶頸。為此,項(xiàng)目組研究開發(fā)了灌芯裝配式混凝土大板剪力墻結(jié)構(gòu)。該種剪力墻結(jié)構(gòu)是一種新型的裝配式混凝土結(jié)構(gòu),具有制造成本低、運(yùn)輸?shù)跹b方便、結(jié)構(gòu)整體性好等特點(diǎn),對(duì)其進(jìn)行研究具有重要的理論意義和廣闊的市場(chǎng)前景。為了研究該種形式的灌芯裝配式混凝土大板剪力墻的抗震性能,項(xiàng)目組按照1:1比例足尺寸制作了兩組不同配筋形式的剪力墻,每一組分別為一片全現(xiàn)澆剪力墻和一片與全現(xiàn)澆剪力墻配筋形式相同的灌芯裝配式混凝土大板剪力墻。其中第一組中的裝配式剪力墻為設(shè)置有剪力鍵槽后澆邊緣構(gòu)件的灌芯裝配式混凝土大板剪力墻,第二組中的裝配式剪力墻為邊緣孔洞帶有豎向插筋的全灌孔灌芯裝配式混凝土大板剪力墻。對(duì)此四片剪力墻進(jìn)行了擬靜力試驗(yàn),對(duì)比研究了兩種不同裝配形式的灌芯裝配式混凝土大板剪力墻抗震性能的異同以及灌芯裝配式混凝土大板剪力墻與相同配筋形式的全現(xiàn)澆剪力墻抗震性能的異同。試驗(yàn)結(jié)果表表明,兩種不同形式的灌芯裝配式混凝土大板剪力墻的破壞形態(tài)分別與相應(yīng)的全現(xiàn)澆剪力墻的破壞形態(tài)基本相同,同為彎剪破壞;灌芯裝配式混凝土大板剪力墻灌孔處新舊混凝土結(jié)合較好,沒(méi)有出現(xiàn)明顯的滑移,說(shuō)明二者可以共同工作;灌芯裝配式混凝土大板剪力墻層間位移角滿足《建筑抗震設(shè)計(jì)規(guī)范》的要求,具有較好的耗能能力;對(duì)于設(shè)置有剪力鍵槽的后澆邊緣構(gòu)件剪力墻,其受力性能類似于框架結(jié)構(gòu)加內(nèi)部填充墻的受力模式,再加上由于鍵槽的存在影響混凝土的流動(dòng)性,導(dǎo)致邊緣構(gòu)件混凝土承載力有所降低,影響墻體的初始剛度,但是正由于剪力鍵槽的存在,使得墻體在承受水平推力時(shí)能夠產(chǎn)生沿鍵槽開展的裂縫,提高墻體的抗剪能力,增加墻體的耗能能力;對(duì)于全灌孔的灌芯裝配式混凝土大板剪力墻,墻體最終破壞時(shí)墻面的裂縫數(shù)量比其他形式的剪力墻的裂縫數(shù)量要少一些,這是由于墻體邊緣構(gòu)件僅有一根直徑為25mm的HRB400級(jí)鋼筋與地梁和加載梁相連,墻體所受的拉力主要由該邊緣構(gòu)件插筋承擔(dān),使得墻體與地梁之間的裂縫較大,能夠耗散大量的能量,也使得墻體水平承載力略低于相同條件的現(xiàn)澆剪力墻,但是墻體位移延性比增加。本文基于大型通用有限元軟件ABAQUS建立合理的數(shù)值分析模型,完成了對(duì)四片剪力墻的非線性有限元數(shù)值分析,分析結(jié)果與試驗(yàn)結(jié)果吻合良好,驗(yàn)證了模型的合理性。同時(shí)系統(tǒng)分析了軸壓比、邊緣構(gòu)件配筋率、墻身鋼筋配筋率以及墻身底部水平鋼筋的間距對(duì)灌芯裝配式混凝土大板剪力墻受力性能的影響,為灌芯裝配式混凝土大板剪力墻的實(shí)際應(yīng)用提供參考。
[Abstract]:Housing industrialization is an important measure to solve the contradiction between population, resources and environment. The core part of housing industrialization is prefabricated concrete structure. At present, the connection technology of the steel bar of prefabricated concrete member has become the key technical bottleneck which affects the application of the assembled concrete structure. For this reason, the project team has researched and developed the large concrete slab shear wall structure with pouring-core assembly. This kind of shear wall structure is a new type of prefabricated concrete structure, which has the characteristics of low manufacturing cost, convenient transportation and hoisting, good integrity of structure, etc. It is of great theoretical significance and broad market prospect to study this kind of shear wall structure. In order to study the seismic behavior of this type of concrete large slab shear wall, two groups of shear walls with different reinforcement types were made according to the 1:1 proportional size. Each group consists of a fully cast-in-situ shear wall and a large concrete slab shear wall with the same reinforced form as the fully cast-in-situ shear wall. The prefabricated shear wall in the first group is a reinforced concrete large slab shear wall with post-cast edge members with shear keyways. In the second group, the prefabricated shear wall is a full-irrigated hole filled with vertical reinforcement in the edge of a large concrete slab shear wall. The pseudostatic test of the four shear walls was carried out. The differences and similarities of seismic behavior of two kinds of cast-in-place reinforced concrete large slab shear walls with different assembly forms are compared and studied, as well as the similarities and differences of seismic behaviors between the cast-in-place shear walls with the same reinforcement and the cast-in-place shear walls with the same reinforcement. The test results show that the failure patterns of two different types of cast-in-place concrete large-slab shear walls are basically the same as those of the corresponding full-cast shear walls, which are the same as the bending shear failure. The combination of new and old concrete at the filling hole of large slab shear wall is better, and there is no obvious slip, which shows that the two can work together. The interstory displacement angle of large concrete slab shear wall with cast-in-place core meets the requirements of the Code for Seismic Design of buildings and has a better energy dissipation capacity. For the shear wall with post-pouring edge member with shear keyway, its mechanical behavior is similar to that of frame structure with internal infill wall, and the fluidity of concrete is affected by the existence of keyway. The concrete bearing capacity of the edge member is reduced, and the initial stiffness of the wall is affected. However, because of the existence of the shear keyway, the wall can produce cracks along the keyway when bearing the horizontal thrust, so as to improve the shear resistance of the wall. Increase the energy dissipation capacity of the wall; When the wall is finally destroyed, the number of cracks in the wall surface is less than that of other types of shear wall. This is due to the fact that only one HRB400 grade steel bar with diameter of 25mm is connected to the ground beam and the loading beam, and the tension of the wall is mainly carried by the edge member, which makes the cracks between the wall and the ground beam larger. It can dissipate a lot of energy and make the horizontal bearing capacity of the wall slightly lower than the cast-in-place shear wall under the same conditions, but the displacement and ductility ratio of the wall increases. In this paper, a reasonable numerical analysis model is established based on the large-scale universal finite element software ABAQUS, and the nonlinear finite element numerical analysis of four shear walls is completed. The results are in good agreement with the experimental results, and the rationality of the model is verified. At the same time, the effects of axial compression ratio, reinforcement ratio of edge members, reinforcement ratio of wall body and the spacing of horizontal reinforcement on the mechanical performance of large slab shear wall with pouring core are analyzed systematically. It provides a reference for the practical application of large concrete slab shear wall.
【學(xué)位授予單位】：吉林建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU375.2;TU352.11
[Abstract]:Housing industrialization is an important measure to solve the contradiction between population, resources and environment. The core part of housing industrialization is prefabricated concrete structure. At present, the connection technology of the steel bar of prefabricated concrete member has become the key technical bottleneck which affects the application of the assembled concrete structure. For this reason, the project team has researched and developed the large concrete slab shear wall structure with pouring-core assembly. This kind of shear wall structure is a new type of prefabricated concrete structure, which has the characteristics of low manufacturing cost, convenient transportation and hoisting, good integrity of structure, etc. It is of great theoretical significance and broad market prospect to study this kind of shear wall structure. In order to study the seismic behavior of this type of concrete large slab shear wall, two groups of shear walls with different reinforcement types were made according to the 1:1 proportional size. Each group consists of a fully cast-in-situ shear wall and a large concrete slab shear wall with the same reinforced form as the fully cast-in-situ shear wall. The prefabricated shear wall in the first group is a reinforced concrete large slab shear wall with post-cast edge members with shear keyways. In the second group, the prefabricated shear wall is a full-irrigated hole filled with vertical reinforcement in the edge of a large concrete slab shear wall. The pseudostatic test of the four shear walls was carried out. The differences and similarities of seismic behavior of two kinds of cast-in-place reinforced concrete large slab shear walls with different assembly forms are compared and studied, as well as the similarities and differences of seismic behaviors between the cast-in-place shear walls with the same reinforcement and the cast-in-place shear walls with the same reinforcement. The test results show that the failure patterns of two different types of cast-in-place concrete large-slab shear walls are basically the same as those of the corresponding full-cast shear walls, which are the same as the bending shear failure. The combination of new and old concrete at the filling hole of large slab shear wall is better, and there is no obvious slip, which shows that the two can work together. The interstory displacement angle of large concrete slab shear wall with cast-in-place core meets the requirements of the Code for Seismic Design of buildings and has a better energy dissipation capacity. For the shear wall with post-pouring edge member with shear keyway, its mechanical behavior is similar to that of frame structure with internal infill wall, and the fluidity of concrete is affected by the existence of keyway. The concrete bearing capacity of the edge member is reduced, and the initial stiffness of the wall is affected. However, because of the existence of the shear keyway, the wall can produce cracks along the keyway when bearing the horizontal thrust, so as to improve the shear resistance of the wall. Increase the energy dissipation capacity of the wall; When the wall is finally destroyed, the number of cracks in the wall surface is less than that of other types of shear wall. This is due to the fact that only one HRB400 grade steel bar with diameter of 25mm is connected to the ground beam and the loading beam, and the tension of the wall is mainly carried by the edge member, which makes the cracks between the wall and the ground beam larger. It can dissipate a lot of energy and make the horizontal bearing capacity of the wall slightly lower than the cast-in-place shear wall under the same conditions, but the displacement and ductility ratio of the wall increases. In this paper, a reasonable numerical analysis model is established based on the large-scale universal finite element software ABAQUS, and the nonlinear finite element numerical analysis of four shear walls is completed. The results are in good agreement with the experimental results, and the rationality of the model is verified. At the same time, the effects of axial compression ratio, reinforcement ratio of edge members, reinforcement ratio of wall body and the spacing of horizontal reinforcement on the mechanical performance of large slab shear wall with pouring core are analyzed systematically. It provides a reference for the practical application of large concrete slab shear wall.
【學(xué)位授予單位】：吉林建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU375.2;TU352.11
【相似文獻(xiàn)】
相關(guān)期刊論文 前10條
1 П.И.瓦西，
本文編號(hào)：2385095
本文鏈接：http://sikaile.net/jianzhugongchenglunwen/2385095.html
最近更新
教材專著
