【摘要】：連廊結(jié)構(gòu)是指設(shè)計在高層建筑一定高度上的架空結(jié)構(gòu),連廊使得原本彼此獨立的各高層建筑單體結(jié)構(gòu)有機地結(jié)合為整體,使得建筑使用率大幅度提升。但是連廊結(jié)構(gòu)的受力也隨之復(fù)雜起來,這樣就會對連廊設(shè)計與施工提出更高的要求。連廊豎向剛度很大,沉降所引起的附加內(nèi)力也隨之增大。如何高效地,準(zhǔn)確地研究施工過程、設(shè)計階段支座沉降對大跨度連廊受力性能的影響,為類似工程設(shè)計提供有用的建議是一個重要課題。1、運用SAP2000有限元軟件分析豎向荷載,支座沉降,溫度以及豎向地震等作用下大跨度鋼結(jié)構(gòu)連廊變形與內(nèi)力變化規(guī)律。分析表明,豎向荷載下,連廊中部受力與變形最大;支座沉降與升溫作用使樓板開裂,產(chǎn)生裂縫,升溫作用使桁架桿件節(jié)點向上位移,對結(jié)構(gòu)產(chǎn)生不利的影響較大;豎向地震作用下,連廊桁架主要受到軸拉力。2、以單榀桁架為基礎(chǔ),對大跨度鋼結(jié)構(gòu)連廊結(jié)構(gòu)選型進行有益探索。分析表明,當(dāng)鋼桁架的跨度較小時,可采用等節(jié)間空腹鋼桁架和不等節(jié)間空腹鋼桁架,宜優(yōu)先選用不等節(jié)間空腹鋼桁架。當(dāng)鋼桁架的跨度較大時,可采混合空腹鋼桁架和斜桿鋼桁架;設(shè)計中將斜桿桁架端部節(jié)間斜腹桿延伸至柱,可大大減少桁架跨度,使得桁架內(nèi)力趨于均勻,桁架受力更加合理。3、對大跨度鋼連廊施工階段模擬分析。簡要闡述本工程使用的沙漏型臨時支撐,重點研究臨時支撐及臨時支撐卸載等工況對大跨度鋼結(jié)構(gòu)連廊內(nèi)力的影響。分析表明,臨時支撐卸載使得結(jié)構(gòu)在水平方向變形較大,豎直方向變形次之;卸載前后,結(jié)構(gòu)弦桿中部節(jié)間軸力增幅較大,腹桿中斜腹桿軸力增幅較大,弦桿與腹桿連接處彎矩與剪力都出現(xiàn)大幅度的增加。4、進行支座沉降對大跨度鋼結(jié)構(gòu)連廊有限元分析,提出臨時支撐卸載階段沉降警戒值,并分別考慮整體平面沉降形式,“盆”式沉降形式以及“鞍”式沉降形式等三種不同支座沉降下鋼結(jié)構(gòu)連廊受力與變形規(guī)律。分析表明,施工階段臨時支撐未卸載時,應(yīng)將兩端不均勻沉降差控制在50mm之內(nèi);支座沉降作用下,連廊變形不盡相同;連廊中部桁架內(nèi)力值最大;對比三種不同形式的沉降形式,當(dāng)鋼連廊不可避免發(fā)生不均勻沉降時,應(yīng)盡量避免沉降量最大處出現(xiàn)在連廊中部;沉降作用對靠近沉降施加處的鋼梁影響較大,對遠(yuǎn)離沉降施加處影響較小。
[Abstract]:Contiguous structure refers to the overhead structure which is designed on a certain height of high-rise building. The verandah makes the individual structure of each high-rise building which is independent of each other organically combined into a whole and makes the utilization rate of the building greatly improved. However, the stress of the corridor structure is complicated, so the design and construction of the corridor will be more demanding. The vertical stiffness of the veranda is very large, and the additional internal force caused by the settlement also increases. How to efficiently and accurately study the construction process and the influence of bearing settlement on the mechanical performance of large span veranda during design stage is an important topic for similar engineering design. 1. Using SAP2000 finite element software to analyze vertical load, The deformation and internal force of long span steel structure are changed under the action of bearing settlement, temperature and vertical earthquake. The analysis shows that under the vertical load, the stress and deformation in the middle of the corridor are the greatest, and the settlement and temperature rise of the bearing make the floor crack and crack, and the temperature rise makes the joint of the truss member displace upward, which has a great adverse effect on the structure. Under the action of vertical earthquake, the truss of corridor is mainly subjected to axial tension. 2. Based on a single truss, this paper makes a beneficial exploration on the selection of corridor structure of large-span steel structure. The analysis shows that when the span of steel truss is small, the steel truss with equal Internode and hollow steel truss with unequal Internode can be adopted, and the steel truss with unequal Internode should be preferred. When the span of steel truss is large, the composite steel truss and inclined bar steel truss can be adopted. In the design, the inclined web bar at the end of the inclined truss can be extended to the column, which can greatly reduce the span of the truss, make the internal force of the truss more uniform, and make the stress of the truss more reasonable. 3. The simulation analysis of the construction stage of the large-span steel verandah is carried out. This paper briefly describes the hourglass temporary support used in this project, and focuses on the influence of temporary support and temporary support unloading on the internal force of the long span steel structure corridor. The analysis shows that the deformation of the structure in the horizontal direction is larger than that in the vertical direction when the temporary bracing is unloaded. Before and after unloading, the axial force increases greatly in the middle of the chord, the axial force in the inclined web in the web, and the bending moment and shear force at the connection between the chord and the web. The finite element analysis of bearing settlement to long span steel structure corridor is carried out, and the warning value of settlement in temporary support unloading stage is put forward, and the integral plane settlement form is considered respectively. The stress and deformation law of steel structure corridor under three kinds of settlement of "basin" type and "saddle" type are three different kinds of bearing settlement. The analysis shows that the uneven settlement difference between the two ends should be controlled within 50mm when temporary support is not unloaded in the construction stage, the deformation of the corridor is different under the action of bearing settlement, the internal force of truss in the middle of the corridor is the largest. Compared with three different forms of settlement, when uneven settlement is inevitable in the steel corridor, the maximum settlement should be avoided in the middle of the corridor. The influence of settlement on the steel beam near the settlement is greater than that on the far away from the settlement.
【學(xué)位授予單位】：蘇州科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU974

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