本文選題：鋼框架-中心支撐結(jié)構(gòu) + 強(qiáng)度折減系數(shù)��； 參考：《河北工程大學(xué)》2017年碩士論文

【摘要】：鋼框架-中心支撐結(jié)構(gòu)體系初始抗側(cè)剛度大,支撐失效后,框架作為儲(chǔ)備體系可以繼續(xù)承擔(dān)側(cè)向荷載,合理的抗震設(shè)計(jì)對(duì)于結(jié)構(gòu)的安全性有著重要作用。歷次震害表明,由于設(shè)計(jì)的不合理導(dǎo)致鋼框架-中心支撐體系的儲(chǔ)備能力不足,造成了結(jié)構(gòu)發(fā)生不同程度的破壞,嚴(yán)重的時(shí)候甚至發(fā)生倒塌,鋼框架-中心支撐結(jié)構(gòu)的儲(chǔ)備體系對(duì)其抗震性能影響顯著。因此,在結(jié)構(gòu)抗震設(shè)計(jì)中應(yīng)考慮儲(chǔ)備體系的作用。結(jié)構(gòu)設(shè)計(jì)中,地震作用通常采用強(qiáng)度折減系數(shù)對(duì)彈性強(qiáng)度進(jìn)行折減獲得,因此確定適用于鋼框架-中心支撐結(jié)構(gòu)的考慮儲(chǔ)備系數(shù)的強(qiáng)度折減系數(shù),是該體系抗震研究的關(guān)鍵。本文以單自由度鋼框架-中心支撐體系為基礎(chǔ),利用動(dòng)力時(shí)程分析方法,分析了延性、儲(chǔ)備系數(shù)、阻尼比對(duì)結(jié)構(gòu)強(qiáng)度折減系數(shù)的影響。結(jié)果表明:強(qiáng)度折減系數(shù)的取值隨延性的提高而顯著增大,低延性結(jié)構(gòu)應(yīng)考慮剛度儲(chǔ)備對(duì)強(qiáng)度折減系數(shù)的影響,延性反應(yīng)較大的中長周期結(jié)構(gòu)應(yīng)考慮強(qiáng)度儲(chǔ)備的影響。最終給出了考慮儲(chǔ)備系數(shù)的鋼框架-中心支撐結(jié)構(gòu)R-μ-T模型,對(duì)該類結(jié)構(gòu)的設(shè)計(jì)提供重要參考。此外采用pushover分析將多自由度轉(zhuǎn)換為以第一振型為主的等效單自由度體系,并基于單自由度鋼框架-中心支撐結(jié)構(gòu)R-μ-T模型提出了簡化的位移評(píng)估方法,依據(jù)一個(gè)鋼框架-中心支撐實(shí)例,采用該方法確定結(jié)構(gòu)的頂點(diǎn)位移,與傳統(tǒng)時(shí)程分析方法進(jìn)行比較,驗(yàn)證了單自由度鋼框架-中心支撐結(jié)構(gòu)體系強(qiáng)度系數(shù)在多自由度鋼框架-中心支撐結(jié)構(gòu)體系的適用性。計(jì)算結(jié)果表明:采用本文提出的單自由度鋼框架-中心支撐結(jié)構(gòu)的R-μ-T模型可以對(duì)鋼框架-中心支撐結(jié)構(gòu)體系的最大頂點(diǎn)位移進(jìn)行評(píng)估,指導(dǎo)多自由度鋼框架-中心支撐結(jié)構(gòu)體系的抗震設(shè)計(jì)和性能評(píng)估。
[Abstract]:The initial lateral stiffness of steel frame-center-braced structure system is large. After the failure of bracing, the frame can continue to bear lateral load as a reserve system. Reasonable seismic design plays an important role in the safety of the structure. The previous earthquake damage shows that due to the unreasonable design, the reserve capacity of the steel frame-central bracing system is insufficient, resulting in the destruction of the structure to varying degrees and even collapse in serious cases. The reserve system of steel frame-center braced structure has a significant effect on its seismic performance. Therefore, the role of reserve system should be considered in seismic design of structures. In structural design, the strength reduction coefficient is usually used to reduce the elastic strength, so it is the key to determine the strength reduction coefficient which is suitable for the steel frame-center braced structure to consider the reserve coefficient. Based on the single-degree-of-freedom steel frame-central bracing system, the influence of ductility, reserve coefficient and damping ratio on structural strength reduction coefficient is analyzed by using dynamic time-history analysis method. The results show that the value of strength reduction coefficient increases significantly with the increase of ductility. The influence of stiffness reserve on strength reduction coefficient should be considered in low ductility structure, and the effect of strength reserve should be considered in medium and long period structures with large ductility response. Finally, the R- 渭 -T model of steel frame-center braced structure considering the reserve coefficient is given, which provides an important reference for the design of this kind of structure. In addition, the multi-degree-of-freedom system is transformed into an equivalent single-degree-of-freedom system based on the first vibration mode by pushover analysis, and a simplified displacement evaluation method is proposed based on the R- 渭 -T model of the steel frame-center braced structure with single degree of freedom. According to an example of steel frame-center bracing, this method is used to determine the vertex displacement of the structure, which is compared with the traditional time history analysis method. The applicability of the strength coefficient of single-degree-of-freedom steel frame-center-braced structure system in multi-degree-of-freedom steel frame-center-braced structure system is verified. The results show that the R- 渭 -T model proposed in this paper can be used to evaluate the maximum vertex displacement of the steel frame-center braced structure system. To guide the seismic design and performance evaluation of multi-DOF steel frame-center braced structure system.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU391

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本文編號(hào)：1994352