本文關(guān)鍵詞： 空斗墻 高性能復合砂漿鋼筋網(wǎng) 加固 抗震性能 非線性有限元分析　出處：《湖南大學》2013年博士論文　論文類型：學位論文

【摘要】：綜述國內(nèi)外砌體結(jié)構(gòu)抗震性能、結(jié)構(gòu)加固和砌體結(jié)構(gòu)有限元仿真分析的研究現(xiàn)狀和發(fā)展趨勢。在大量試驗和有限元仿真分析的基礎上，對空斗墻片和HPFL條帶加固空斗墻片的抗震性能進行了較系統(tǒng)的研究。 對砌體分離式有限元模型進行了研究。建立了考慮砂漿與磚塊之間黏結(jié)作用和剪切滑移作用的雙剪面單磚砌體試件的三維有限元模型。由于磚與砂漿之間的黏結(jié)滑移關(guān)系目前研究尚不成熟，本文提出了一種黏結(jié)滑移關(guān)系曲線，并以試件在剪壓作用下的試驗結(jié)果為目標函數(shù)，提出一種改進的遺傳算法，通過APDL語言編制反演程序，在有限元軟件ANSYS中實現(xiàn)黏結(jié)滑移關(guān)系曲線的參數(shù)反演。該分離式有限元模型和黏結(jié)滑移關(guān)系曲線能用于砌體墻片的有限元分析中。 對24片空斗墻試件和3片實砌墻試件進行了擬靜力試驗。通過墻片的擬靜力試驗觀察墻片的整個破壞過程，分析墻片的破壞形態(tài)和抗剪承載力、滯回曲線、骨架曲線、延性等抗震性能指標。 建立了空斗墻分離式有限元模型。在試驗結(jié)果和有限元分析的基礎上，系統(tǒng)的研究了砌筑方式、砌筑材料強度、高寬比和豎向壓力對空斗墻抗剪性能的影響。砌筑方式不同，對空斗墻抗剪性能有所影響，但影響不大，在實際工程應用中，，均可按全斗墻考慮，偏于安全。不同的砌筑材料強度對空斗墻抗震性能的影響較大。隨著砂漿強度的提高，空斗墻的開裂荷載和極限荷載均提高。隨著高寬比增大，墻體抗剪承載力減小。在相同條件，豎向壓應力較小的情況下，隨著豎向壓應力增大，空斗墻的抗震承載力和變形能力均增大；當豎向壓應力達到空斗墻豎向承載能力的0.6倍左右時，豎向壓應力繼續(xù)增大，空斗墻的抗震承載力反倒減小。 依據(jù)庫侖理論、主拉應力理論以及主壓應力強度理論，首次提出了剪壓狀態(tài)下空斗砌體的破壞準則。提出了空斗墻的抗剪強度計算公式。 對9片采用高性能復合砂漿鋼筋網(wǎng)（HPFL）條帶修復已損壞空斗墻和9片HPFL條帶加固未損壞空斗墻與9片修復前的墻體和3片未加固墻體的對比墻體進行了擬靜力試驗，分析墻片的破壞形態(tài)和開裂荷載、極限荷載、滯回曲線、骨架曲線、剛度退化等性能指標。研究表明，采用HPFL條帶修復的方法能恢復甚至提高受損空斗墻結(jié)構(gòu)的抗震性能；采用HPFL條帶加固無損空斗墻結(jié)構(gòu)，能大幅提高墻體的極限承載力，改善墻體的延性和剛度退化。 建立了HPFL條帶加固空斗墻的分離式有限元模型。在試驗結(jié)果和有限元分析的基礎上，系統(tǒng)分析了加固條帶寬度、加固面層砂漿強度、加固層鋼筋網(wǎng)密度、砌筑砂漿強度、墻片高寬比和豎向壓應力等因素對加固效果的影響。加固條帶寬度對HPFL條帶加固性能的影響很大，增大加固條帶的寬度是提高墻體抗剪承載力的最有效方式。隨著加固面層砂漿強度的提高，墻體的抗剪承載力隨之提高。隨著加固層鋼筋網(wǎng)格尺寸加密，極限承載力略有增大，但提高效果不明顯。不同砂漿強度砌筑的墻體，HPFL條帶加固均能較大幅度的提高墻體的極限承載力；砌筑砂漿強度較高的墻體，加固后極限承載力的提高幅度略大于砌筑砂漿強度較低的墻體。經(jīng)過HPFL條帶加固的空斗墻的效果受高寬比變化的影響較小，HPFL條帶圈梁構(gòu)造柱式加固方式對各種高寬比的空斗墻都是有效的。HPFL條帶圈梁構(gòu)造柱式加固空斗墻，受豎向壓應力大小的影響，條帶的受力原理有所不同，但該加固方式對各種豎向壓應力下的空斗墻都是有效的。 提出了HPFL條帶加固空斗墻的抗剪強度計算公式。
[Abstract]:Overview of seismic performance of masonry structure at home and abroad, the research status and development trend of structural analysis and finite element simulation of reinforced masonry structure. Based on the analysis of a large number of experiments and finite element simulation, the empty bucket wall and HPFL strip empty bucket wall seismic performance were systematically studied.
The masonry separated finite element model is studied. Considering the three-dimensional finite element model of the double shear test of single brick masonry bonding and shear slip effect between mortar and bricks. The relationship of bond slip between brick and mortar of the present study is not mature, this paper presents a bond slip relationship curve and, with specimens in the shear test results under pressure as the objective function, an improved genetic algorithm is proposed, through the APDL language program to realize parameter inversion inversion, bond slip relation curve in finite element software ANSYS. The separation type finite element model and bond slip relationship curve can be used to finite element masonry the wall was analyzed.
The 24 empty bucket wall specimens and 3 pieces of solid walls are tested by the pseudo static test. Through the whole failure process of wall pseudo static test observation of wall, analysis of failure mode of wall and the shear bearing capacity, hysteretic curve, skeleton curve, ductility and seismic performance index.
The establishment of the cavity wall separate finite element model. Based on the experimental results and finite element analysis on the system of construction, the strength of masonry materials, high aspect ratio and vertical pressure effect on the bucket wall shear capacity of masonry. In different ways, impact on the cavity wall shear performance, but the impact is not big, in practical engineering applications, can be considered as a full bucket wall, on the safe side. Construction material has great influence on the strength of different cavity wall seismic performance. With the improvement of mortar strength, cavity wall cracking load and ultimate load are increased. As the aspect ratio increases, the wall shear stress decreased. In the same conditions, the vertical compressive stress is smaller, with the vertical compressive stress increases, the empty bucket wall seismic bearing capacity and deformation capacity are increased; when about 0.6 times the vertical compressive stress reaches the cavity wall of vertical bearing capacity, vertical compressive stress to In addition, the seismic bearing capacity of the bucket wall decreases.
Based on Coulomb theory, principal tensile stress theory and principal compressive stress strength theory, the failure criterion of hollow bucket masonry under shear pressure is first put forward. A formula for calculating shear strength of hollow bucket wall is put forward.
The 9 sheets with high performance ferrocement (HPFL) strip to repair a damaged wall of an empty bucket and 9 pieces of HPFL strip without damage of cavity wall and 9 pieces of repair before the wall and 3 pieces of unreinforced wall between the wall of the pseudo static test, analysis of failure modes and the cracking of wall load, ultimate load, hysteretic curve, skeleton curve, stiffness degradation and other performance indicators. The results show that the method of HPFL strip repair can restore and even improve the seismic performance of damaged air bucket wall structure; using HPFL strip lossless cavity wall structure, wall can significantly improve the ultimate bearing capacity, improve the wall the ductility and stiffness degradation.
The establishment of the HPFL strip cavity wall of the separate finite element model. Based on the experimental results and finite element analysis, systematic analysis of the reinforcement strip width, the strength of mortar layer reinforcement, reinforcement layer steel mesh density, strength of masonry mortar, influence of wall aspect ratio and vertical stress and other factors on the effect of reinforcement. The reinforcement strip width of HPFL strip reinforcement effect properties and reinforcement increases the width of the strip is to improve the shear capacity of the most effective ways. With the strength of mortar surface layer reinforcement, shear strength increases with the increase of the wall. With the reinforcement of reinforced mesh size encryption. A slight increase of ultimate bearing capacity, but the improving effect is not obvious. Different mortar strength of masonry wall strengthened with HPFL strips can greatly improve the ultimate bearing capacity of the wall; the wall masonry mortar with high strength, reinforcement of the ultimate bearing capacity The increase is slightly larger than the low strength mortar wall strengthened with HPFL strips. After the empty bucket wall by the effect of the ratio of height to width smaller changes, HPFL strip pillar reinforcement ring beams and constructional way are effective.HPFL strip pillar reinforcement cavity wall beam structure of high aspect ratio of cavity wall. The vertical compressive stress influence the size of the strip force principle is different, but the way of strengthening of the vertical stress of the cavity wall are effective.
A formula for calculating the shear strength of a HPFL strip reinforced empty bucket wall is proposed.

【學位授予單位】：湖南大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU352.11;TU364

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本文編號：1442001