支座沉降对大跨度钢结构连廊受力性能的影响分析
发布时间：2018-11-28 18:48
【摘要】：连廊结构是指设计在高层建筑一定高度上的架空结构,连廊使得原本彼此独立的各高层建筑单体结构有机地结合为整体,使得建筑使用率大幅度提升。但是连廊结构的受力也随之复杂起来,这样就会对连廊设计与施工提出更高的要求。连廊竖向刚度很大,沉降所引起的附加内力也随之增大。如何高效地,准确地研究施工过程、设计阶段支座沉降对大跨度连廊受力性能的影响,为类似工程设计提供有用的建议是一个重要课题。1、运用SAP2000有限元软件分析竖向荷载,支座沉降,温度以及竖向地震等作用下大跨度钢结构连廊变形与内力变化规律。分析表明,竖向荷载下,连廊中部受力与变形最大;支座沉降与升温作用使楼板开裂,产生裂缝,升温作用使桁架杆件节点向上位移,对结构产生不利的影响较大;竖向地震作用下,连廊桁架主要受到轴拉力。2、以单榀桁架为基础,对大跨度钢结构连廊结构选型进行有益探索。分析表明,当钢桁架的跨度较小时,可采用等节间空腹钢桁架和不等节间空腹钢桁架,宜优先选用不等节间空腹钢桁架。当钢桁架的跨度较大时,可采混合空腹钢桁架和斜杆钢桁架;设计中将斜杆桁架端部节间斜腹杆延伸至柱,可大大减少桁架跨度,使得桁架内力趋于均匀,桁架受力更加合理。3、对大跨度钢连廊施工阶段模拟分析。简要阐述本工程使用的沙漏型临时支撑,重点研究临时支撑及临时支撑卸载等工况对大跨度钢结构连廊内力的影响。分析表明,临时支撑卸载使得结构在水平方向变形较大,竖直方向变形次之;卸载前后,结构弦杆中部节间轴力增幅较大,腹杆中斜腹杆轴力增幅较大,弦杆与腹杆连接处弯矩与剪力都出现大幅度的增加。4、进行支座沉降对大跨度钢结构连廊有限元分析,提出临时支撑卸载阶段沉降警戒值,并分别考虑整体平面沉降形式,“盆”式沉降形式以及“鞍”式沉降形式等三种不同支座沉降下钢结构连廊受力与变形规律。分析表明,施工阶段临时支撑未卸载时,应将两端不均匀沉降差控制在50mm之内;支座沉降作用下,连廊变形不尽相同;连廊中部桁架内力值最大;对比三种不同形式的沉降形式,当钢连廊不可避免发生不均匀沉降时,应尽量避免沉降量最大处出现在连廊中部;沉降作用对靠近沉降施加处的钢梁影响较大,对远离沉降施加处影响较小。
[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.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU974
本文编号：2363932
[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.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU974
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