鉸支墻—框架新型結構體系的損傷控制研究
發(fā)布時間：2018-08-29 11:24
【摘要】：震后可恢復性(Earthquake Resilience)已經(jīng)成為了建筑結構體系的重要評價標準之一。作為高層建筑結構中最主要的抗側力構件,鋼筋混凝土剪力墻在近幾次大地震中暴露出了震后可恢復性方面的缺陷。主要表現(xiàn)為連梁損傷嚴重、難以修復;剪力墻底部鋼筋屈曲、混凝土壓潰、剪切破壞明顯,同樣難以修復。針對上述兩點問題,本文分別研究了剪切型金屬阻尼器連梁和塑性鉸支墻兩種構件,建立兩類構件的設計方法和簡化數(shù)值模型。在此基礎上運用連續(xù)化方法對鉸支墻-框架結構體系中塑性鉸支墻和消能連梁的強度和剛度需求進行了討論。本文的主要研究內(nèi)容如下:1.對國內(nèi)多組普通RC連梁和剪力墻構件試驗的結果進行了統(tǒng)計分析,其結果顯示了兩類RC構件的變形能力與設計參數(shù)之間的關聯(lián)存在較明顯的離散性。2.提出了帶縫鋼板阻尼器及跨中布置該阻尼器的剪切型消能連梁。本文通過對大剪跨比(r=3.0)的普通RC連梁和剪切型消能連梁的對比試驗研究,結果顯示,普通RC連梁和消能連梁試件的實測峰值荷載和名義屈服剪力值相差在4%以內(nèi)。消能連梁阻尼器可以更早地進入屈服耗能狀態(tài),避免連梁混凝土部分遭受嚴重損傷。消能連梁變形的80%以上集中在阻尼器內(nèi),充分發(fā)揮了位移相關型阻尼器的耗能能力。阻尼器連接構造存在滑移,一定程度上影響了阻尼器性能的發(fā)揮。最后,建立了消能連梁的簡化數(shù)值模型并驗證了其適用性。3.針對剪力墻底部墻肢復雜的彎剪耦合作用機制,提出了抗彎/抗剪功能分離的塑性鉸支墻并建立了相應的承載力和剛度設計公式。通過塑性鉸支墻與普通RC剪力墻的對比試驗證明,本文提出的設計方法可以更準確的獲得塑性鉸支墻不同性能目標下力學性能;塑性鉸支墻具有更強的變形和耗能能力;塑性鉸支墻的總變形中,彎曲變形占有絕對比重,避免了鉸支墻發(fā)生剪切型破壞,保證了“強剪弱彎”的性能,從而避免了底部墻肢的不可修復損傷。4.對塑性鉸支墻的主要設計參數(shù)進行了研究,給出了相關建議。建立塑性鉸支墻的簡化數(shù)值模型。其中,采用在纖維模型的截面附加剪切恢復力本構來模擬RC剪力墻的方法,以及采用零長單元模擬阻尼器連接段非線性行為的方法均根據(jù)試驗結果進行了準確性驗證。在此基礎上研究了塑性鉸支墻幾何參數(shù)(墻肢寬高比r、鉸支座高度比μ)、軸壓比ν、阻尼器核心段初始剛度Ked對墻肢力學性能的影響,參數(shù)分析的結果顯示,阻尼器性能的發(fā)揮主要受幾何參數(shù)的影響,建議將塑性鉸支墻布置在結構底部加強層范圍內(nèi),高寬比r≤1.0,同時,鉸支座的布置高度不宜超過鉸支墻高度的60%。在滿足阻尼器極限變形要求的前提下,通過選擇更大的高度比μ和初始軸向剛度Ked更大的阻尼器,可以使塑性鉸支墻獲得更高的承載力和剛度。5.采用連續(xù)化設計,對鉸支墻結構和鉸支墻-框架結構在三種常見類型的水平荷載作用下的效應進行分析。結果表明,連續(xù)化設計方法可以得到鉸支墻結構的結構響應,內(nèi)力和變形計算公式中均顯出鉸支墻所在層的性能對結構響應的影響比較明顯。
[Abstract]:Earthquake Resilience has become one of the important evaluation criteria of building structure system. As the most important lateral resistance member of high-rise building structure, reinforced concrete shear wall has exposed the defect of post-earthquake restorability in recent large earthquakes. In view of the above two problems, the design method and simplified numerical model of shear-type metal damper coupling beam and plastic hinged wall are studied respectively in this paper. The main contents of this paper are as follows: 1. Statistical analysis of the test results of several groups of RC and shear wall members in China shows that there is an obvious correlation between the deformation capacity and design parameters of the two types of RC members. Discreteness. 2. A steel plate damper with slits and a shear-type energy dissipation coupling beam with the damper in the middle of the span are proposed. The experimental results show that the difference between the measured peak load and nominal yield shear force of the ordinary RC coupling beam and the shear-type energy dissipation coupling beam with large shear span ratio (r=3.0) is 4%. Less than 80% of the deformation of the energy dissipation coupling beam is concentrated in the damper, which makes full use of the energy dissipation capacity of the displacement-dependent damper. Finally, a simplified numerical model of the energy dissipation coupling beam is established and its applicability is verified. 3. In view of the complicated Bending-shearing coupling mechanism of the shear wall at the bottom of the wall, the plastic hinged wall with separated bending and shearing functions is proposed and the corresponding design formulas of bearing capacity and stiffness are established. Experiments show that the proposed design method can more accurately obtain the mechanical properties of the plastic hinged wall under different performance objectives; the plastic hinged wall has stronger deformation and energy dissipation capacity; the bending deformation occupies an absolute proportion in the total deformation of the plastic hinged wall, avoiding the shear failure of the hinged wall, and guaranteeing the "strong shear and weak bending" of the total deformation. 4. Major design parameters of the plastic hinged wall are studied and relevant suggestions are given. A simplified numerical model of the plastic hinged wall is established. Based on the experimental results, the effects of geometric parameters of plastic hinged wall (width-height ratio r, height ratio of hinged support mu), axial compression ratio_and initial stiffness of the damper core on the mechanical properties of the wall are studied. The results of parameter analysis show that the damper is effective. It is suggested that the height-width ratio R < 1.0 and the height of the hinged support should not exceed 60% of the height of the hinged wall. On the premise of satisfying the limit deformation requirement of the damper, the height of the hinged support should be greater than that of the Mu and the initial axial stiffness Ked. Large dampers can increase the bearing capacity and stiffness of plastic hinged walls. 5. The effects of hinged walls and hinged walls-frame structures under three common types of horizontal loads are analyzed by using the continuous design method. The results show that the structural responses, internal forces and variations of hinged walls can be obtained by the continuous design method. It is shown in the formula that the performance of the hinged wall is more obvious to the structural response.
【學位授予單位】：中國地震局工程力學研究所
【學位級別】：博士
【學位授予年份】：2017
【分類號】：TU973
本文編號：2211056
[Abstract]:Earthquake Resilience has become one of the important evaluation criteria of building structure system. As the most important lateral resistance member of high-rise building structure, reinforced concrete shear wall has exposed the defect of post-earthquake restorability in recent large earthquakes. In view of the above two problems, the design method and simplified numerical model of shear-type metal damper coupling beam and plastic hinged wall are studied respectively in this paper. The main contents of this paper are as follows: 1. Statistical analysis of the test results of several groups of RC and shear wall members in China shows that there is an obvious correlation between the deformation capacity and design parameters of the two types of RC members. Discreteness. 2. A steel plate damper with slits and a shear-type energy dissipation coupling beam with the damper in the middle of the span are proposed. The experimental results show that the difference between the measured peak load and nominal yield shear force of the ordinary RC coupling beam and the shear-type energy dissipation coupling beam with large shear span ratio (r=3.0) is 4%. Less than 80% of the deformation of the energy dissipation coupling beam is concentrated in the damper, which makes full use of the energy dissipation capacity of the displacement-dependent damper. Finally, a simplified numerical model of the energy dissipation coupling beam is established and its applicability is verified. 3. In view of the complicated Bending-shearing coupling mechanism of the shear wall at the bottom of the wall, the plastic hinged wall with separated bending and shearing functions is proposed and the corresponding design formulas of bearing capacity and stiffness are established. Experiments show that the proposed design method can more accurately obtain the mechanical properties of the plastic hinged wall under different performance objectives; the plastic hinged wall has stronger deformation and energy dissipation capacity; the bending deformation occupies an absolute proportion in the total deformation of the plastic hinged wall, avoiding the shear failure of the hinged wall, and guaranteeing the "strong shear and weak bending" of the total deformation. 4. Major design parameters of the plastic hinged wall are studied and relevant suggestions are given. A simplified numerical model of the plastic hinged wall is established. Based on the experimental results, the effects of geometric parameters of plastic hinged wall (width-height ratio r, height ratio of hinged support mu), axial compression ratio_and initial stiffness of the damper core on the mechanical properties of the wall are studied. The results of parameter analysis show that the damper is effective. It is suggested that the height-width ratio R < 1.0 and the height of the hinged support should not exceed 60% of the height of the hinged wall. On the premise of satisfying the limit deformation requirement of the damper, the height of the hinged support should be greater than that of the Mu and the initial axial stiffness Ked. Large dampers can increase the bearing capacity and stiffness of plastic hinged walls. 5. The effects of hinged walls and hinged walls-frame structures under three common types of horizontal loads are analyzed by using the continuous design method. The results show that the structural responses, internal forces and variations of hinged walls can be obtained by the continuous design method. It is shown in the formula that the performance of the hinged wall is more obvious to the structural response.
【學位授予單位】：中國地震局工程力學研究所
【學位級別】：博士
【學位授予年份】：2017
【分類號】：TU973
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