梁柱弱軸連接翼緣削弱型節(jié)點的試驗研究和有限元分析
發(fā)布時間：2019-06-10 21:32
【摘要】：1994年美國北嶺地震和1995年日本阪神地震中，曾經被認為具有良好抗震性能的鋼框架梁柱連接處發(fā)現了大量的脆性斷裂。震后人們對鋼框架梁柱連接抗震性能進行了大量研究，提出了一種新型延性節(jié)點—翼緣削弱型節(jié)點(RBS)。翼緣削弱型節(jié)點的設計思路是，對距梁柱連接處一定距離的梁截面進行局部削弱，促使塑性鉸在梁削弱位置出現并擴展，避開節(jié)點域焊縫密集區(qū)，避免節(jié)點發(fā)生脆性破壞，提高節(jié)點延性性能。目前國內外對翼緣削弱型節(jié)點的研究主要集中在梁柱強軸連接，對梁柱弱軸連接研究較少。為此，本文對鋼框架梁柱弱軸栓焊混合連接翼緣削弱型節(jié)點開展了試驗研究和有限元分析。 本文在參考國內外文獻資料的基礎上，設計了3個鋼框架梁柱弱軸栓焊混合連接翼緣削弱型節(jié)點試件，進行了低周反復荷載作用下的試驗研究，研究了節(jié)點的破壞形態(tài)、滯回性能、承載力等。作為對比，還設計了一個普通節(jié)點試件。試驗在梁端施加低周往復荷載，4個試件的破壞形態(tài)相似，焊縫通過孔處的梁翼緣首先屈曲，進而在焊縫通過孔處出現裂縫并擴展，導致試件的承載力下降并破壞，破壞位置在焊縫通過孔處的梁端。對削弱試件而言，塑性鉸沒有在梁削弱位置出現。試件破壞的主要原因是焊縫通過孔切割過大、表面粗糙，導致焊縫通過孔處產生應力集中。研究結果表明：焊縫通過孔的大小和切割好壞對試件破壞及塑性鉸的出現有重要影響；試驗中鋼框架梁柱弱軸栓焊混合連接翼緣削弱型節(jié)點與普通節(jié)點相比，滯回曲線稍顯豐滿，滯回環(huán)面積稍大些，說明削弱參數如設置不當，未必能有效提高塑性耗能能力。 基于3個翼緣削弱型節(jié)點試件和1個普通節(jié)點試件試驗研究基礎上，利用有限元軟件ABAQUS對試驗試件進行了數值模擬分析，考慮了材料非線性、幾何非線性，研究了翼緣削弱型節(jié)點的破壞形態(tài)、滯回性能、承載力等。有限元分析結果和試驗結果較吻合。由于焊縫通過孔處梁翼緣無腹板支撐，產生局部屈曲，試件在梁端破壞，沒有實現塑性鉸外移。分析結果表明：焊縫通過孔對削弱試件的破壞形態(tài)和塑性鉸的出現有重要影響；試驗結果和有限元分析均顯示削弱試件與普通試件相比，承載力有所下降，所以在試件設計時翼緣削弱對承載力下降的影響不能完全忽略；梁翼緣有、無削弱以及焊縫通過孔對試件關鍵部位應力變化影響很大。 此外，為了考慮焊縫通過孔對試驗試件的影響，對試驗試件進行了改進，設計了無焊縫通過孔翼緣削弱型節(jié)點試件和梁拼接點焊縫通過孔在削弱位置外側翼緣削弱型節(jié)點試件，同樣利用有限元軟件ABAQUS進行數值模擬分析。分析結果表明：無焊縫通過孔和梁拼接點焊縫通過孔在削弱位置外側的翼緣削弱型節(jié)點試件均實現了塑性鉸外移，與普通試件相比，具有較強的耗能性能、延性性能；為有效實現翼緣削弱型節(jié)點塑性鉸外移，，建議焊縫通過孔設置在削弱位置外側，或者不設焊縫通過孔。
[Abstract]:A lot of brittle fracture was found at the joint of the steel frame and column, which had been considered to have good anti-seismic performance in the northern part of the United States in 1994 and the earthquake of the Japanese earthquake in 1995. After the earthquake, the anti-seismic performance of the beam-column connection of the steel frame is studied in a large scale, and a new type of ductile-node fin-edge weakening-type node (RBS) is proposed. The design idea of the flange-weakening type node is that the section of the beam at a certain distance from the joint of the beam-column is partially weakened, and the plastic hinge is caused to appear and expand at the weakened position of the beam, so as to avoid the dense area of the welding seam of the node, so that the brittle failure of the node can be avoided, and the ductility performance of the node is improved. At present, the research of the flange-weakening type node at home and abroad is mainly focused on the beam-column strong shaft connection, and the connection of the beam-column weak shaft is less. In this paper, the experimental research and the finite element analysis of the flange-weakened joints of the steel frame beam-column weak-shaft bolt-welded joint are carried out. On the basis of reference to the domestic and foreign literature, this paper designs 3 steel frame beam-column weak-shaft bolt-welded joint flange-weakening type node test piece, and carries out the test research under the action of low-cycle repeated load, and studies the failure mode, the hysteretic behavior, the bearing of the node, in contrast, a common node is also designed The test piece shall be tested at the beam end with low-cycle reciprocating load. The failure mode of the four test pieces is similar. The beam flange at the passing hole of the weld joint is first buckled, and then the crack and expansion at the passing hole of the welding line cause the bearing capacity of the test piece to drop and break, and the damage position is at the through hole of the weld joint. The beam end. The plastic hinge is not in the beam weakening position for the weakened test piece The main reason for the failure of the test piece is that the weld is cut too large through the hole, the surface is rough, causing the weld to generate stress through the hole The results show that the size and the cutting of the weld seam have an important influence on the failure of the test piece and the appearance of the plastic hinge. Large, indicating that the weakening parameter, such as improper setting, may not be effective to improve the plastic energy consumption On the basis of three flange-weakening type node test piece and one common node test piece test, the finite element software ABAQUS is used to simulate the test piece, and the nonlinear and geometric nonlinearity of the material is considered, and the damage form of the edge weakening type node is studied. hysteretic behavior , bearing capacity, etc. Finite element analysis results and tests The result is in good agreement. Because the welding seam is not supported by the web at the beam flange at the hole, the local buckling is generated, and the test piece is damaged at the end of the beam and is not implemented. The results of the analysis show that the test results and the finite element analysis show that the load bearing of the test piece is less than that of the normal test piece. The force has decreased, so the influence of flange weakening on the bearing capacity is not completely ignored in the design of the test piece; the flange of the beam is not weakened and the stress of the key part of the test piece is changed through the hole In addition, in order to consider the influence of the weld through the hole on the test piece, the test piece is modified, and the weld through the hole flange weakening type node test piece and the beam splicing point weld joint is designed through the hole in the weakened position. Edge-weakening-type node test piece, also using the finite element software ABAQUS The numerical simulation is carried out. The results of the analysis show that the weld of the weld through the hole and the joint of the beam through the hole and the edge of the flange at the outer side of the weakened position can be removed by the plastic hinge, and it has stronger consumption compared with the common test piece. the performance and the ductility performance of the flange are effectively realized; the plastic hinge of the flange weakening type node is effectively realized, and the welding seam is recommended to be arranged on the outer side of the weakening position through the hole o
【學位授予單位】：青島理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU391
[Abstract]:A lot of brittle fracture was found at the joint of the steel frame and column, which had been considered to have good anti-seismic performance in the northern part of the United States in 1994 and the earthquake of the Japanese earthquake in 1995. After the earthquake, the anti-seismic performance of the beam-column connection of the steel frame is studied in a large scale, and a new type of ductile-node fin-edge weakening-type node (RBS) is proposed. The design idea of the flange-weakening type node is that the section of the beam at a certain distance from the joint of the beam-column is partially weakened, and the plastic hinge is caused to appear and expand at the weakened position of the beam, so as to avoid the dense area of the welding seam of the node, so that the brittle failure of the node can be avoided, and the ductility performance of the node is improved. At present, the research of the flange-weakening type node at home and abroad is mainly focused on the beam-column strong shaft connection, and the connection of the beam-column weak shaft is less. In this paper, the experimental research and the finite element analysis of the flange-weakened joints of the steel frame beam-column weak-shaft bolt-welded joint are carried out. On the basis of reference to the domestic and foreign literature, this paper designs 3 steel frame beam-column weak-shaft bolt-welded joint flange-weakening type node test piece, and carries out the test research under the action of low-cycle repeated load, and studies the failure mode, the hysteretic behavior, the bearing of the node, in contrast, a common node is also designed The test piece shall be tested at the beam end with low-cycle reciprocating load. The failure mode of the four test pieces is similar. The beam flange at the passing hole of the weld joint is first buckled, and then the crack and expansion at the passing hole of the welding line cause the bearing capacity of the test piece to drop and break, and the damage position is at the through hole of the weld joint. The beam end. The plastic hinge is not in the beam weakening position for the weakened test piece The main reason for the failure of the test piece is that the weld is cut too large through the hole, the surface is rough, causing the weld to generate stress through the hole The results show that the size and the cutting of the weld seam have an important influence on the failure of the test piece and the appearance of the plastic hinge. Large, indicating that the weakening parameter, such as improper setting, may not be effective to improve the plastic energy consumption On the basis of three flange-weakening type node test piece and one common node test piece test, the finite element software ABAQUS is used to simulate the test piece, and the nonlinear and geometric nonlinearity of the material is considered, and the damage form of the edge weakening type node is studied. hysteretic behavior , bearing capacity, etc. Finite element analysis results and tests The result is in good agreement. Because the welding seam is not supported by the web at the beam flange at the hole, the local buckling is generated, and the test piece is damaged at the end of the beam and is not implemented. The results of the analysis show that the test results and the finite element analysis show that the load bearing of the test piece is less than that of the normal test piece. The force has decreased, so the influence of flange weakening on the bearing capacity is not completely ignored in the design of the test piece; the flange of the beam is not weakened and the stress of the key part of the test piece is changed through the hole In addition, in order to consider the influence of the weld through the hole on the test piece, the test piece is modified, and the weld through the hole flange weakening type node test piece and the beam splicing point weld joint is designed through the hole in the weakened position. Edge-weakening-type node test piece, also using the finite element software ABAQUS The numerical simulation is carried out. The results of the analysis show that the weld of the weld through the hole and the joint of the beam through the hole and the edge of the flange at the outer side of the weakened position can be removed by the plastic hinge, and it has stronger consumption compared with the common test piece. the performance and the ductility performance of the flange are effectively realized; the plastic hinge of the flange weakening type node is effectively realized, and the welding seam is recommended to be arranged on the outer side of the weakening position through the hole o
【學位授予單位】：青島理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU391
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