【摘要】：采用裝配式建筑是實現(xiàn)建筑工業(yè)化的必經(jīng)之路。傳統(tǒng)的裝配式混凝土框架節(jié)點在節(jié)點連接處不牢靠,不容易滿足循環(huán)荷載作用下的抗震要求,且現(xiàn)場裝配程序繁瑣,不適合大量推廣。對預制裝配式節(jié)點施加預應力,利用預應力筋在節(jié)點區(qū)實現(xiàn)梁柱預壓連接,可以有效增加節(jié)點抵抗反復荷載作用的整體性和連續(xù)性,從而實現(xiàn)裝配式框架節(jié)點連接的可靠性,達到相應的抗震要求,有利于預制裝配式結構在地震區(qū)能得到較好的推廣應用。預應力裝配結構完美地將預應力技術和裝配式技術結合在了一起,兼具兩者的優(yōu)點,是實現(xiàn)該目標很好的手段。目前主要通過試驗來研究預應力裝配式結構,可靠的有限元模擬手段有待進一步探索。本文,利用ABAQUS軟件對預應力裝配式框架中節(jié)點開展了低周反復加載下的有限元模擬分析,采用SAP2000軟件和ABAQUS軟件分別對預應力裝配式單榀框架進行了Pushover推覆分析。本文主要研究內(nèi)容和得到的結論如下:1、結合無粘結預應力裝配式框架中節(jié)點在低周往復荷載下的試驗,包含一個現(xiàn)澆節(jié)點、三個預應力裝配式框架中節(jié)點,利用ABAQUS通用有限元計算軟件建立對應框架節(jié)點的有限元模型,分別為現(xiàn)澆中節(jié)點YMCJ模型、預應力裝配式框架中節(jié)點YPCJ-1,YPCJ-2,YPCJ-3模型,詳細分析了每個模型的ABAQUS前處理過程。根據(jù)《裝配式混凝土結構技術規(guī)程》JGJ1-2014,經(jīng)過合理簡化設計,建立后澆整體式框架中節(jié)點YHMCJ,進行低周反復加載有限元模擬分析,進一步驗證了有限元分析研究預制裝配式結構的可靠性。2、進行了預制裝配式框架節(jié)點有限元模擬分析。對一個現(xiàn)澆中節(jié)點和3個典型的預應力裝配式中節(jié)點試件分別進行模擬,在破壞形式、耗能能力、滯回曲線、骨架曲線、延性系數(shù)等抗震性能方面對比分析試驗結果和有限元分析結果。研究表明ABAQUS仿真模擬分析結果主要抗震性能指標與試驗結論能較好的吻合,證明本文的有限元模擬手段具有較好的可靠性和有效性,從而能夠依據(jù)有限試驗的數(shù)據(jù)結合科學的數(shù)值分析方法,更進一步地研究預應力裝配式結構的抗震性能。3、利用數(shù)值模擬中的計算結果對預應力裝配式框架節(jié)點的抗剪受力機理進行分析,研究發(fā)現(xiàn)預應力裝配式節(jié)點抗剪能力的提高主要在于預應力提供的擠壓作用,并依據(jù)現(xiàn)有的鋼筋混凝土節(jié)點抗剪計算公式,提出預應力裝配式節(jié)點抗剪計算公式,通過不同有效預應力大小有限元模擬分析,推導出公式中預應力擠壓作用抗剪強度貢獻系數(shù)的取值,為實際工程取值提供參考。4、結合以上分析結論,選擇預應筋偏心距為95mm的YPCJ-2模型,改變相關參數(shù)進行大量有限元模擬分析,研究預應力裝配式混凝土節(jié)點的影響因素,主要影響因素包括節(jié)點裝配形式、有效預應力大小、預應力筋粘結形式、軸壓比、混凝土強度,普通鋼筋強度、縱向鋼筋配筋率、配箍率,根據(jù)上述有限元分析結果,主要研究影響因素對節(jié)點骨架曲線、極限荷載的影響規(guī)律,對比分析各個影響因素對極限荷載的影響程度,為今后預應力裝配式框架節(jié)點有限分析及結構設計提供參考建議。5、結合預應力裝配式混凝土單榀框架試驗,利用SAP2000軟件建立相對應的一跨三層單榀現(xiàn)澆混凝土框架和預應力裝配式框架有限元模型,利用ABAQUS建立相對應的預應力裝配式框架模型,利用SAP2000和ABAQUS有限元分析軟件分別對單榀框架做靜力彈塑性Pushover分析,在Pushover推覆分析過程中得到框架出現(xiàn)塑性較的位置及順序圖,與實驗結果對比分析,分析預應力裝配式單榀框架的破壞機制,并且利用SAP2000軟件通過參數(shù)優(yōu)化使預應力裝配式框架發(fā)生更利于震后修復的梁鉸制破壞機制,研究表明:預應力裝配式框架與現(xiàn)澆混凝土單榀框架的破壞機制一致,符合規(guī)范“強柱弱梁設計”。對于預應力裝配式框架結構通過增加柱剛度可以實現(xiàn)更利于震后修復的梁鉸制破壞機制。
[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.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU378.4;TU352.11

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