无粘结预应力装配式框架抗震性能分析
发布时间：2019-04-16 12:25
【摘要】：采用装配式建筑是实现建筑工业化的必经之路。传统的装配式混凝土框架节点在节点连接处不牢靠,不容易满足循环荷载作用下的抗震要求,且现场装配程序繁琐,不适合大量推广。对预制装配式节点施加预应力,利用预应力筋在节点区实现梁柱预压连接,可以有效增加节点抵抗反复荷载作用的整体性和连续性,从而实现装配式框架节点连接的可靠性,达到相应的抗震要求,有利于预制装配式结构在地震区能得到较好的推广应用。预应力装配结构完美地将预应力技术和装配式技术结合在了一起,兼具两者的优点,是实现该目标很好的手段。目前主要通过试验来研究预应力装配式结构,可靠的有限元模拟手段有待进一步探索。本文,利用ABAQUS软件对预应力装配式框架中节点开展了低周反复加载下的有限元模拟分析,采用SAP2000软件和ABAQUS软件分别对预应力装配式单榀框架进行了Pushover推覆分析。本文主要研究内容和得到的结论如下:1、结合无粘结预应力装配式框架中节点在低周往复荷载下的试验,包含一个现浇节点、三个预应力装配式框架中节点,利用ABAQUS通用有限元计算软件建立对应框架节点的有限元模型,分别为现浇中节点YMCJ模型、预应力装配式框架中节点YPCJ-1,YPCJ-2,YPCJ-3模型,详细分析了每个模型的ABAQUS前处理过程。根据《装配式混凝土结构技术规程》JGJ1-2014,经过合理简化设计,建立后浇整体式框架中节点YHMCJ,进行低周反复加载有限元模拟分析,进一步验证了有限元分析研究预制装配式结构的可靠性。2、进行了预制装配式框架节点有限元模拟分析。对一个现浇中节点和3个典型的预应力装配式中节点试件分别进行模拟,在破坏形式、耗能能力、滞回曲线、骨架曲线、延性系数等抗震性能方面对比分析试验结果和有限元分析结果。研究表明ABAQUS仿真模拟分析结果主要抗震性能指标与试验结论能较好的吻合,证明本文的有限元模拟手段具有较好的可靠性和有效性,从而能够依据有限试验的数据结合科学的数值分析方法,更进一步地研究预应力装配式结构的抗震性能。3、利用数值模拟中的计算结果对预应力装配式框架节点的抗剪受力机理进行分析,研究发现预应力装配式节点抗剪能力的提高主要在于预应力提供的挤压作用,并依据现有的钢筋混凝土节点抗剪计算公式,提出预应力装配式节点抗剪计算公式,通过不同有效预应力大小有限元模拟分析,推导出公式中预应力挤压作用抗剪强度贡献系数的取值,为实际工程取值提供参考。4、结合以上分析结论,选择预应筋偏心距为95mm的YPCJ-2模型,改变相关参数进行大量有限元模拟分析,研究预应力装配式混凝土节点的影响因素,主要影响因素包括节点装配形式、有效预应力大小、预应力筋粘结形式、轴压比、混凝土强度,普通钢筋强度、纵向钢筋配筋率、配箍率,根据上述有限元分析结果,主要研究影响因素对节点骨架曲线、极限荷载的影响规律,对比分析各个影响因素对极限荷载的影响程度,为今后预应力装配式框架节点有限分析及结构设计提供参考建议。5、结合预应力装配式混凝土单榀框架试验,利用SAP2000软件建立相对应的一跨三层单榀现浇混凝土框架和预应力装配式框架有限元模型,利用ABAQUS建立相对应的预应力装配式框架模型,利用SAP2000和ABAQUS有限元分析软件分别对单榀框架做静力弹塑性Pushover分析,在Pushover推覆分析过程中得到框架出现塑性较的位置及顺序图,与实验结果对比分析,分析预应力装配式单榀框架的破坏机制,并且利用SAP2000软件通过参数优化使预应力装配式框架发生更利于震后修复的梁铰制破坏机制,研究表明:预应力装配式框架与现浇混凝土单榀框架的破坏机制一致,符合规范“强柱弱梁设计”。对于预应力装配式框架结构通过增加柱刚度可以实现更利于震后修复的梁铰制破坏机制。
[Abstract]:The use of fabricated building is a necessary way to realize the industrialization of the building. The traditional assembled concrete frame node is not firm at the joint of the nodes, does not easily meet the earthquake resistance requirement under the action of cyclic load, and the field assembly procedure is complicated and is not suitable for large-scale popularization. the pre-stress is applied to the prefabricated assembled node, the beam-column pre-pressing connection is realized in the node area by using the pre-stressed steel bar, the integrity and the continuity of the joint resistance and the repeated load action can be effectively increased, the reliability of the assembly frame node connection is realized, and the corresponding earthquake resistance requirement is achieved, And is beneficial to the better popularization and application of the prefabricated assembled structure in the earthquake area. The pre-stressed assembly structure perfectly combines the pre-stress technology with the assembly technology, and has the advantages of both, and is a good means for realizing the target. At present, the test is mainly used to study the pre-stressed assembly structure, and the reliable finite element simulation method is to be further explored. In this paper, the finite element simulation analysis of the low-cycle and repeated loading of the nodes in the pre-stressed assembly frame is carried out by means of ABAQUS software. The main contents and conclusions of this paper are as follows:1. Combined with the test of the node under the low-cycle reciprocating load in the non-bonded pre-stressed assembly frame, it includes a cast-in-place node and three pre-stressed assembly frames. The finite element model of the corresponding frame node is established by using the ABAQUS general-purpose finite element calculation software, which is the YMCJ model in the cast-in-place node, the YPCJ-1, YPCJ-2 and YPCJ-3 models in the pre-stressed assembly frame, and the ABAQUS pre-processing procedure of each model is analyzed in detail. According to the technical specification of the assembled concrete structure, JGJ1-2014, after a reasonable and simplified design, the node YHJ in the post-cast integral frame is established, and the low-cycle repeated loading finite element simulation analysis is carried out, and the reliability of the prefabricated assembled structure is further verified by the finite element analysis. The finite element simulation of the prefabricated assembled frame was carried out. The test results and the finite element analysis results of a cast-in-place middle node and three typical pre-stressed assembly are simulated, and the results of the test and the finite element analysis are compared in the aspects of failure mode, energy dissipation capacity, hysteresis curve, skeleton curve and ductility coefficient. The results show that the main anti-seismic performance index of ABAQUS simulation is good agreement with the test conclusion, and it is proved that the finite element simulation method has good reliability and effectiveness, and can be combined with the scientific numerical analysis method according to the data of the limited test. In this paper, the anti-seismic performance of the pre-stressed assembly structure is further studied, and the shear force mechanism of the pre-stressed assembled frame node is analyzed by using the calculation results in the numerical simulation. In this paper, it is found that the improvement of the shear capacity of the pre-stressed assembly node is mainly due to the pressing effect provided by the prestress, and on the basis of the existing shear calculation formula of the reinforced concrete node, the shear calculation formula of the pre-stressed assembly type node is put forward, the finite element simulation analysis of the pre-stressed assembly type node is adopted, In this paper, the value of the contribution coefficient of the shear strength of the pre-stressed extrusion in the formula is derived, and a reference is given for the value of the actual project.4. In combination with the above analysis, the YPCJ-2 model with the eccentricity of 95 mm is selected, and the relevant parameters are changed to a large number of finite element simulation analysis. The influence factors of the pre-stressed assembled concrete node are studied. The main influencing factors include the node assembly form, the effective prestress, the bond form of the prestressed reinforcement, the axial compression ratio, the strength of the concrete, the strength of the normal steel bar, the reinforcement ratio of the longitudinal reinforcement, the stirrup ratio, Based on the results of the finite element analysis, the influence factors of the influence factors on the node skeleton curve and the limit load are mainly studied, the influence of each influence factor on the limit load is compared and analyzed, and the reference suggestions for the finite analysis and structural design of the pre-stressed assembled frame are provided. in combination with that test of the pre-stressed assembly type concrete single-load frame, a three-layer single-layer cast-in-situ concrete frame and a pre-stress assembly frame finite element model corresponding to the three-layer single-layer cast-in-place concrete frame are established by using the SAP2000 software, and a corresponding pre-stressed assembly framework model is established by using the ABAQUS, By using SAP2000 and ABAQUS finite element analysis software, the static and elastic-plastic pushover analysis of the single frame is carried out, and the position and sequence diagram of the frame in the frame are obtained in the process of pushover analysis, and the damage mechanism of the pre-stressed assembled single-frame frame is analyzed. And using the SAP2000 software to optimize the pre-stressed assembly frame to be more beneficial to the post-earthquake repair of the beam hinge damage mechanism through the parameter optimization, the research shows that the pre-stressed assembly frame is consistent with the failure mechanism of the cast-in-place concrete single-frame frame, and the specification "design of strong-column weak beam" is in accordance with the specification. For the pre-stressed assembly frame structure, the beam-hinge failure mechanism which is more beneficial to the post-earthquake repair can be realized by increasing the column stiffness.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU378.4;TU352.11
本文编号：2458777
[Abstract]:The use of fabricated building is a necessary way to realize the industrialization of the building. The traditional assembled concrete frame node is not firm at the joint of the nodes, does not easily meet the earthquake resistance requirement under the action of cyclic load, and the field assembly procedure is complicated and is not suitable for large-scale popularization. the pre-stress is applied to the prefabricated assembled node, the beam-column pre-pressing connection is realized in the node area by using the pre-stressed steel bar, the integrity and the continuity of the joint resistance and the repeated load action can be effectively increased, the reliability of the assembly frame node connection is realized, and the corresponding earthquake resistance requirement is achieved, And is beneficial to the better popularization and application of the prefabricated assembled structure in the earthquake area. The pre-stressed assembly structure perfectly combines the pre-stress technology with the assembly technology, and has the advantages of both, and is a good means for realizing the target. At present, the test is mainly used to study the pre-stressed assembly structure, and the reliable finite element simulation method is to be further explored. In this paper, the finite element simulation analysis of the low-cycle and repeated loading of the nodes in the pre-stressed assembly frame is carried out by means of ABAQUS software. The main contents and conclusions of this paper are as follows:1. Combined with the test of the node under the low-cycle reciprocating load in the non-bonded pre-stressed assembly frame, it includes a cast-in-place node and three pre-stressed assembly frames. The finite element model of the corresponding frame node is established by using the ABAQUS general-purpose finite element calculation software, which is the YMCJ model in the cast-in-place node, the YPCJ-1, YPCJ-2 and YPCJ-3 models in the pre-stressed assembly frame, and the ABAQUS pre-processing procedure of each model is analyzed in detail. According to the technical specification of the assembled concrete structure, JGJ1-2014, after a reasonable and simplified design, the node YHJ in the post-cast integral frame is established, and the low-cycle repeated loading finite element simulation analysis is carried out, and the reliability of the prefabricated assembled structure is further verified by the finite element analysis. The finite element simulation of the prefabricated assembled frame was carried out. The test results and the finite element analysis results of a cast-in-place middle node and three typical pre-stressed assembly are simulated, and the results of the test and the finite element analysis are compared in the aspects of failure mode, energy dissipation capacity, hysteresis curve, skeleton curve and ductility coefficient. The results show that the main anti-seismic performance index of ABAQUS simulation is good agreement with the test conclusion, and it is proved that the finite element simulation method has good reliability and effectiveness, and can be combined with the scientific numerical analysis method according to the data of the limited test. In this paper, the anti-seismic performance of the pre-stressed assembly structure is further studied, and the shear force mechanism of the pre-stressed assembled frame node is analyzed by using the calculation results in the numerical simulation. In this paper, it is found that the improvement of the shear capacity of the pre-stressed assembly node is mainly due to the pressing effect provided by the prestress, and on the basis of the existing shear calculation formula of the reinforced concrete node, the shear calculation formula of the pre-stressed assembly type node is put forward, the finite element simulation analysis of the pre-stressed assembly type node is adopted, In this paper, the value of the contribution coefficient of the shear strength of the pre-stressed extrusion in the formula is derived, and a reference is given for the value of the actual project.4. In combination with the above analysis, the YPCJ-2 model with the eccentricity of 95 mm is selected, and the relevant parameters are changed to a large number of finite element simulation analysis. The influence factors of the pre-stressed assembled concrete node are studied. The main influencing factors include the node assembly form, the effective prestress, the bond form of the prestressed reinforcement, the axial compression ratio, the strength of the concrete, the strength of the normal steel bar, the reinforcement ratio of the longitudinal reinforcement, the stirrup ratio, Based on the results of the finite element analysis, the influence factors of the influence factors on the node skeleton curve and the limit load are mainly studied, the influence of each influence factor on the limit load is compared and analyzed, and the reference suggestions for the finite analysis and structural design of the pre-stressed assembled frame are provided. in combination with that test of the pre-stressed assembly type concrete single-load frame, a three-layer single-layer cast-in-situ concrete frame and a pre-stress assembly frame finite element model corresponding to the three-layer single-layer cast-in-place concrete frame are established by using the SAP2000 software, and a corresponding pre-stressed assembly framework model is established by using the ABAQUS, By using SAP2000 and ABAQUS finite element analysis software, the static and elastic-plastic pushover analysis of the single frame is carried out, and the position and sequence diagram of the frame in the frame are obtained in the process of pushover analysis, and the damage mechanism of the pre-stressed assembled single-frame frame is analyzed. And using the SAP2000 software to optimize the pre-stressed assembly frame to be more beneficial to the post-earthquake repair of the beam hinge damage mechanism through the parameter optimization, the research shows that the pre-stressed assembly frame is consistent with the failure mechanism of the cast-in-place concrete single-frame frame, and the specification "design of strong-column weak beam" is in accordance with the specification. For the pre-stressed assembly frame structure, the beam-hinge failure mechanism which is more beneficial to the post-earthquake repair can be realized by increasing the column stiffness.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU378.4;TU352.11
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