双向弦支组合楼盖结构静力性能及施工全过程分析

鲍振洲; 安琦; 董雨昊

doi:10.13206/j.gjgS22062101

双向弦支组合楼盖结构静力性能及施工全过程分析

doi: 10.13206/j.gjgS22062101

1. 农业农村部机关服务局, 北京 100125;
2. 青岛理工大学土木工程学院, 山东青岛 266520

基金项目:

山东省自然科学基金项目（ZR2020QE243）。

详细信息

作者简介:
鲍振洲,男,1987年出生,硕士,工程师。

通讯作者:
安琦,男,1987年出生,博士,讲师,anqi@qut.edu.cn。

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- 文章访问数: 257
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- 被引次数: 0
出版历程
- 收稿日期: 2022-06-21
- 网络出版日期: 2022-10-28

Analysis of Static Performance and Construction Process of Bi-Directional Cable-Supported Composite Floor Structure

Zhenzhou Bao¹,
Qi An^{2
, ,},
Yuhao Dong²

1. Service Center of the Ministry of Agriculture and Rural Affairs, Beijing 100125, China;
2. School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, China

摘要

摘要: 随着大型公共建筑的大规模建设，多层大跨度结构随之产生，其最大特点为楼盖跨度较大。目前能够应用于大跨度楼盖的结构体系主要有四类，即空腹夹层楼盖、钢桁（网）架组合楼盖、弦支楼盖以及预应力楼盖。为进一步提高楼盖结构跨越能力，提高传力效率，提出一种新型大跨度楼盖结构体系——双向弦支组合楼盖结构。首先通过数值模拟的方法，对新型结构体系的静力性能和传力机理进行了系统研究，重点讨论了结构在施工阶段和使用阶段的支座反力、拉索内力、钢梁内力以及混凝土内力的时空变化规律，其次通过与常规组合楼盖结构进行对比，研究新型楼盖结构在跨越能力方面的提升效果，最后对双向弦支组合楼盖结构的设计方法进行了探讨，研究了在设计中忽略施工过程对设计结果的影响。
结果显示：结构水平法向支座反力在混凝土施工阶段出现大幅增加，且边界中间位置与两侧位置水平反力方向相反，在使用阶段，结构的法向水平支座反力最大，其次是竖向反力，切向水平反力最小。滑动支座水平位移在施工过程中变化较小。拉索内力在施工过程中总的趋势是逐渐增加，但在张拉阶段中间位置拉索内力存在一定的回落，除张拉阶段以外，其他施工阶段及使用阶段均为中间位置索力大、两侧位置索力小。钢梁轴力在钢结构拼装和拉索张拉阶段时均为压力，在混凝土施工阶段和使用阶段呈现中部受拉、两侧受压的空间分布。钢梁弯矩在钢结构拼装阶段以正弯矩为主，在拉索张拉阶段以负弯矩为主，在混凝土施工阶段和使用阶段呈现中部正弯矩、两侧负弯矩的分布特点。混凝土板处于受压状态，弯矩数值较小；双向弦支组合楼盖相较于常规双向组合楼盖而言，支座水平反力、结构轴力、弯矩及竖向变形均有较大幅度的减小，静力性能优于常规双向组合楼盖；在双向弦支组合结构静力性能分析时，不考虑施工过程的计算结果与实际情况存在较大偏差，且大部分结构关键内力结果均偏小，对于结构设计而言存在一定安全隐患，所以建议在设计中采用考虑施工过程的方案进行分析。
- 大跨度楼盖结构 /
- 弦支结构 /
- 组合楼盖 /
- 静力性能 /
- 施工全过程分析
Abstract: With the large-scale construction of large public buildings, multi-storey large span structure comes into being. The biggest feature of the structure is that the span of floor structure is large. At present, there are four kinds of structural systems that can be applied to long-span floor, namely hollow sandwich floor, steel truss(net rack) composite floor, cable-supported floor and prestressed floor. In order to further improve the span capacity of floor structure and improve the force transmission efficiency, a new type of long-span floor structure, namely bi-directional cable-supported composite floor structure(BCSCFS), is presented in this paper. Through the numerical simulation method, the static performance of new type of structure system and the force transmission mechanism had carried out firstly, and the law over space and time in the construction and service phase in terms of the support reaction force, cable force, steel beam force and the internal force of concrete slab were discussed. Secondly, by comparing with the conventional composite floor structure, the improvement effect of the new floor structure in span capacity was studied. Finally, the design method of the new structure was discussed, and the influence of neglecting the construction process on the design result was studied.
The results show that:the horizontal normal support reaction force in the concrete construction stage increased significantly, and the horizontal reaction direction at the middle position and side position of the boundary is opposite. In the use stage, the normal horizontal support reaction force is the largest, followed by the vertical reaction force, tangential horizontal reaction force is the smallest. In the construction process, the horizontal displacement of sliding support changes little. The general trend of the cable force in the construction process is gradually increased, but there is a certain drop in the tension stage in the middle position. Except the tension stage, the cable force in the middle position is large and that in the two sides is small in the other construction and service stages. The axial force of steel beam is pressure in the stage of steel structure assembling and cable tensioning. In the stage of concrete construction and service, the middle part of steel beam is strained and the two sides are pressed. The bending moment of steel beam is mainly positive bending moment in steel structure assembling stage and negative bending moment in cable tensioning stage. In the concrete construction stage and the use stage, the middle of the steel beam is positive bending moment, the two sides are negative bending moment. The concrete slab is under pressure at all stages, and the bending moment is small. Compared with the conventional bi-directional composite floor, the horizontal reaction force, structural axial force, bending moment and vertical deformation of the support are greatly reduced, and the static performance is better than that of the conventional bi-directional composite floor. When analyzing the static performance of BCSCFS, there is a large deviation between the calculation results of the direct method and the actual situation, and most of the internal forces of the key structure part are relatively small. There is a certain safety hazard for the structure design, so it is recommended to adopt the method considering the construction process in analysis of structure in the design.
- long-span floor structure /
- cable-supported structure /
- composite floor /
- static performance /
- construction process analysis

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