【摘要】：現(xiàn)代城市應(yīng)具備在大災(zāi)難后足夠的恢復(fù)能力，使得人的生活不因災(zāi)難而受到大的影響。自復(fù)位體系正是在這樣的背景下產(chǎn)生的�，F(xiàn)有的自復(fù)位體系大多采用形狀記憶合金或者復(fù)合有機材料充當復(fù)位筋，兩者造價均較高。另外，部分自復(fù)位體系/支撐采用摩擦耗能機制，摩擦面的老化及穩(wěn)定性是一個棘手的問題。防屈曲支撐以其飽滿穩(wěn)定的滯回性能獲得很多研究者及工程師的青睞，，但是，其彈塑性耗能機制使得結(jié)構(gòu)震后產(chǎn)生不可忽略的殘余變形。 針對以上問題，本文進行了以下工作。 （1）綜合考慮防屈曲支撐及自復(fù)位體系的優(yōu)點，提出了一種新型防屈曲支撐——自復(fù)位防屈曲支撐（SCBRB）。在此基礎(chǔ)上，給出復(fù)位材料的選擇方案和設(shè)計方法。如果綜合復(fù)位及耗能能力，則預(yù)應(yīng)力與耗能內(nèi)芯屈服強度相等時為最佳方案。通過對純防屈曲支撐、純復(fù)位支撐及自復(fù)位防屈曲支撐擬靜力試驗對比表明：復(fù)位防屈曲支撐基本消除了純防屈曲支撐的殘余變形，具有良好的復(fù)位效果和相當?shù)暮哪苣芰Α?（2）給出單自由度防屈曲支撐體系的幾個重要參數(shù)，并給出了單自由度防屈曲支撐結(jié)構(gòu)的恢復(fù)力模型與這些參數(shù)之間的關(guān)系。通過對自復(fù)位鋼框架結(jié)構(gòu)的時程分析，對比了自復(fù)位防屈曲支撐、防屈曲支撐及普通鋼框架的抗震性能；通過參數(shù)分析，給出結(jié)構(gòu)設(shè)計時幾個重要參數(shù)的建議取值。通過對不同梁端連接方式的結(jié)構(gòu)抗震性能的研究發(fā)現(xiàn)，梁對柱子轉(zhuǎn)動約束能力越弱，則柱子彈性變形能力越強，結(jié)構(gòu)也就越柔。當?shù)卣饛姸群艽髸r，則梁端鉸接體系更有利于消除殘余變形。 （3）對等效線性化方法在自復(fù)位防屈曲支撐結(jié)構(gòu)的應(yīng)用進行了研究。通過20條地震記錄下兩種等效線性化方法求得位移，并與非線性時程分析結(jié)果進行對比，結(jié)果表明等效線性化方法對于自復(fù)位結(jié)構(gòu)的精度比理想彈塑性結(jié)構(gòu)更高；等概率幅值平均等效線性化方法由于考慮了所有位移對等效阻尼和等效剛度的貢獻，因此更為精確。 （4）基于非線性位移比，提出一種直接計算自復(fù)位結(jié)構(gòu)位移的方法。首先，通過對453600個單自由度體系進行非線性時程分析，得到各類場地統(tǒng)計意義上的等強度位移比譜。然后對位移比譜進行參數(shù)分析，得到各個參數(shù)對位移比的影響規(guī)律。最后，對位移比進行多元非線性回歸，得到了位移比的公式。 （5）針對目前大部分結(jié)構(gòu)抗震設(shè)計方法均需要迭代以及現(xiàn)有的基于位移直接設(shè)計方法的不足這一現(xiàn)狀，提出一種基于位移的自復(fù)位防屈曲支撐結(jié)構(gòu)直接設(shè)計方法。首先，通過大量的統(tǒng)計回歸，得到了結(jié)構(gòu)強度折減系數(shù)關(guān)于位移比的公式。然后，根據(jù)目標位移和公式便可計算出結(jié)構(gòu)與支撐的所有主要參數(shù)。經(jīng)其設(shè)計的結(jié)構(gòu)是偏于安全的，有效地消除了殘余變形。
[Abstract]:Modern cities should be able to recover enough after a catastrophe so that people's lives are not greatly affected by disasters. It is in this context that the self-reset system is produced. Most of the existing self-reset systems use shape memory alloys or composite organic materials as reposition tendons, both of which are expensive. In addition, friction energy dissipation mechanism is used in partial self-reset system / brace, and the aging and stability of friction surface is a thorny problem. Buckling braces are favored by many researchers and engineers for their full and stable hysteretic properties. However, the elastic-plastic energy dissipation mechanism results in the residual deformation of the structure after earthquake. In view of the above problems, this paper has carried out the following work. The main results are as follows: (1) considering the advantages of anti-buckling brace and self-reduction system, a new type of anti-buckling brace (SCBRB).) is proposed. On this basis, the selection scheme and design method of the reset material are given. If the comprehensive reset and energy dissipation capacity are combined, the optimum scheme is when the yield strength of the prestressing and energy dissipation cores is equal. The comparison of pseudo-static test of pure buckling bracing, pure reset bracing and self-reset anti-buckling bracing shows that the reduced anti-buckling bracing basically eliminates the residual deformation of pure anti-buckling bracing, and has good reset effect and equivalent energy dissipation ability. (2) several important parameters of single-degree-of-freedom buckle-resistant bracing system are given, and the relationship between the restoring force model of single-degree-of-freedom buckling bracing structure and these parameters is given. Based on the time-history analysis of self-reset steel frame structure, the aseismic performance of self-reset buckling bracing, buckling bracing and ordinary steel frame is compared, and the suggested values of several important parameters in structural design are given through parameter analysis. By studying the seismic behavior of structures with different beam end connections, it is found that the weaker the beam is to the column, the stronger the elastic deformation ability of the column is and the more flexible the structure is. When the earthquake intensity is high, the beam end hinge system is more favorable to eliminate the residual deformation. (3) the application of equivalent linearization method to self-reset buckling braced structures is studied. The displacement is obtained by two equivalent linearization methods under 20 seismic records and compared with the results of nonlinear time-history analysis. The results show that the accuracy of the equivalent linearization method for self-reset structures is higher than that for ideal elastic-plastic structures. The equal-probability average equivalent linearization method is more accurate because it takes into account the contribution of all displacements to the equivalent damping and stiffness. (4) based on the nonlinear displacement ratio, a direct method for calculating the displacement of self-reset structures is proposed. Firstly, through the nonlinear time history analysis of 453600 single-degree-of-freedom systems, the iso-intensity displacement ratio spectra in the statistical sense of all kinds of sites are obtained. Then the parameter analysis of the displacement ratio spectrum is carried out and the influence of each parameter on the displacement ratio is obtained. Finally, the multivariate nonlinear regression of displacement ratio is carried out, and the formula of displacement ratio is obtained. (5) in view of the fact that most seismic design methods need iteration and the shortcomings of the existing direct displacement-based design methods, a displacement-based direct design method for buckling braced structures is proposed. Firstly, the formula of structural strength reduction coefficient about displacement ratio is obtained by a large number of statistical regression. Then, all the main parameters of the structure and bracing can be calculated according to the target displacement sum formula. The designed structure is relatively safe and effectively eliminates the residual deformation.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TU352.11

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