【摘要】：鋼結(jié)構(gòu)憑借其自重輕、布置靈活、抗震性能好等優(yōu)點(diǎn),在工程中得到了廣泛的應(yīng)用。近些年地震災(zāi)害頻頻發(fā)生,造成了巨大經(jīng)濟(jì)損失和人員傷亡。鋼結(jié)構(gòu)的抗震性能研究變得愈來(lái)愈重要。而鋼框架梁柱節(jié)點(diǎn)是結(jié)構(gòu)抗震的薄弱環(huán)節(jié),在地震作用下,節(jié)點(diǎn)域腹板往往由于過(guò)早屈服破壞退出工作,導(dǎo)致節(jié)點(diǎn)破壞乃至整個(gè)結(jié)構(gòu)的坍塌。本文依托有限元軟件Ansys Workbench,采用雙線性隨動(dòng)強(qiáng)化模型,服從Von-Mises屈服準(zhǔn)則,選擇合理的加載制度分別對(duì)剛性節(jié)點(diǎn)和半剛性節(jié)點(diǎn)進(jìn)行單向加載和循環(huán)加載,分析展示節(jié)點(diǎn)域腹板的受力情況、螺栓群的等效應(yīng)力云圖、剛性節(jié)點(diǎn)的連接角鋼以及半剛性節(jié)點(diǎn)的連接端板的受力、節(jié)點(diǎn)處梁截面的等效應(yīng)力云圖,以及各試件的滯回曲線。從而模擬分析出布置斜肋以及不同的斜肋添加方式對(duì)以上兩種節(jié)點(diǎn)形式抗震性能的影響,提出指導(dǎo)實(shí)際工程中節(jié)點(diǎn)抗震設(shè)計(jì)的合理措施。在建模過(guò)程中,建立多處接觸對(duì)模擬螺帽下表面與連接板、連接板與柱翼緣外側(cè)、螺桿與孔壁多處摩擦,其中焊縫用綁定接觸模擬,并考慮螺栓預(yù)緊拉力存在,網(wǎng)格劃分采用手動(dòng)劃分網(wǎng)格的方式,對(duì)連接角鋼、連接端板以及螺栓群進(jìn)行局部加密,柱底全面固結(jié),柱頂端施加豎直向下的集中荷載,梁遠(yuǎn)端施加豎直向下的位移荷載。最終分別得到單向荷載作用下,斜肋的布置方式對(duì)剛性節(jié)點(diǎn)和半剛性節(jié)點(diǎn)的節(jié)點(diǎn)域腹板、連接板以及螺栓的影響;循環(huán)荷載下,剛性節(jié)點(diǎn)和半剛性節(jié)點(diǎn)域腹板的等效應(yīng)力和RN(剛性節(jié)點(diǎn))系列和HRN(半剛性節(jié)點(diǎn))系列試件的滯回曲線。并分析對(duì)比有限元計(jì)算結(jié)果,得到相應(yīng)的結(jié)論:無(wú)論是單向加載還是循環(huán)加載,斜肋的布置對(duì)剛性節(jié)點(diǎn)性能有很好的改善,對(duì)于剛性節(jié)點(diǎn),在抗震設(shè)計(jì)建議使用雙邊交叉布置一字斜肋(RN3)的節(jié)點(diǎn)形式;斜肋的布置,對(duì)于半剛性節(jié)點(diǎn),在單向荷載作用下可以有效減小節(jié)點(diǎn)域腹板的等效應(yīng)力,但是會(huì)給連接板及螺栓造成不利影響,在循環(huán)往復(fù)荷載下的滯回曲線與不布置斜肋的試件相差不大,其滯回性能沒(méi)有很大程度的提高,在抗震設(shè)計(jì)中應(yīng)根據(jù)實(shí)際情況酌情使用。
[Abstract]:Steel structure has been widely used in engineering because of its light weight, flexible arrangement and good seismic performance. Earthquake disasters have occurred frequently in recent years, resulting in huge economic losses and casualties. The study of seismic behavior of steel structures is becoming more and more important. The joint of the steel frame Liang Zhu is the weak link of earthquake resistance. Under the earthquake action, the web in the joint domain often exits from work because of premature yield failure, which leads to the joint failure and even the collapse of the whole structure. In this paper, based on the finite element software Ansys Workbench, a bilinear servo strengthening model is adopted. According to the Von-Mises yield criterion, a reasonable loading system is chosen for unidirectional loading and cyclic loading of rigid and semi-rigid joints, respectively. The equivalent stress cloud diagram of bolt group, the connection angle steel of rigid joint and the connection end plate of semi-rigid joint, the equivalent stress cloud diagram of beam section at the joint, and the hysteresis curve of each specimen are analyzed. The influence of the arrangement of inclined ribs and the different ways of adding oblique ribs on the seismic performance of the above two joint forms is simulated and analyzed, and the reasonable measures to guide the seismic design of joints in practical engineering are put forward. In the modeling process, multiple contact pairs were established to simulate the bottom surface of the nut and the connecting plate, the outer side of the connecting plate and the flange of the column, and the friction between the screw and the hole wall, in which the weld seam was simulated by binding contact, and the pre-tightening tension force of the bolt was considered. The method of manual mesh division is used to encrypt the connecting angle steel, connecting end plate and bolt group. The bottom of the column is fully consolidated, the top of the column is subjected to vertical downward concentrated load, and the distal end of the beam is subjected to vertical downward displacement load. Finally, the influence of the arrangement of oblique ribs on the web, connection plate and bolt of rigid and semi-rigid joints is obtained respectively under unidirectional load. The equivalent stress of the web of rigid and semi-rigid joints and the hysteretic curves of RN (rigid joints) series and HRN (semi-rigid joints) series specimens. By analyzing and comparing the finite element calculation results, the corresponding conclusions are obtained: whether under unidirectional or cyclic loading, the arrangement of oblique ribs improves the performance of rigid joints very well, and for rigid joints, In aseismic design, it is suggested to use the joint form of two-sided cross arrangement with a zigzag rib (RN3), and for semi-rigid joints, the equivalent stress of the web in the joint domain can be reduced effectively under unidirectional load. However, the hysteretic curve under cyclic reciprocating load is not different from that of the specimen without inclined rib, and its hysteretic performance is not greatly improved. Therefore, the hysteretic curve should be used according to the actual situation in seismic design.
【學(xué)位授予單位】：中國(guó)石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU391

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本文編號(hào)：2233763