地下紧固件增强混凝土剪切墙的柔性和剪切变形
1School of Architecture, Civil Engineering and Geomatics, FHNW University of Applied Sciences and Arts Northwestern Switzerland, Hofackerstrasse 30, 4132 Muttenz, Switzerland.
Materials (Basel, Switzerland)
|May 25, 2024
概括
这项研究研究了在地震负荷下剪切壁的行为,详细说明负载移位曲线和裂纹模式. 结果突出了张力转移效应和滑动故障的风险,在紧支墙壁的低面积比.
科学领域:
- 结构工程 结构工程
- 地震工程的工程是地震工程.
- 材料科学 是一种材料科学.
背景情况:
- 对建筑物的地震反应进行精确的分析需要了解支墙的负载-变形行为.
- 水平支墙的地下室基础中的紧固细节得到了有限的研究关注.
- 剪切墙是抵御横向负荷的关键结构部件,特别是在地震区域.
研究的目的:
- 在模拟的地震负荷下实验性地研究大规模剪切壁的行为.
- 量化张力转移效应对剪切壁悬臂部分负载位移行为的影响.
- 识别故障模式,特别是在紧的底座连接中,以及它们对几何参数的依赖.
主要方法:
- 进行了三次大规模的剪切墙实验 (NW 1, NW 2, NW 3) 在1:1,5尺度.
- 使用了十二个位移传感器,一个八个摄像头的光学测量系统,以及手动的裂纹测量.
- 测量了力-位移曲线,曲率分布,裂图案,裂开口和间距.
主要成果:
- 量化了张力转移效应对悬臂部分负载位移曲线的影响.
- 实验数据显示了墙壁高度的详细裂图案,包括打开和间隔.
- 一个关键的发现表明,在面积比 (H/L) 为1或更小的墙壁上,必须考虑紧固部分的滑动故障.
结论:
- 该研究提供了关于在地震负荷下剪切墙性能的关键数据,为更准确的结构分析提供了信息.
- 了解张力转移效应对于精确预测墙壁行为和容量至关重要.
- 对于特定尺寸比的紧底座,已确定滑动故障的风险,需要考虑设计,以防止过早故障.
相关概念视频
01:15Posttensioned Masonry Walls
144
Post-tensioned masonry walls use high-strength steel rods or flexible tendons to enhance the strength and efficiency of masonry structures. These elements are securely anchored to the foundation and extend vertically either within the cores of the masonry units or between the masonry wythes. The construction process involves building the wall with these tensioning elements in place and allowing the mortar to fully cure.
Following the curing process, the tensioning begins. Steel rods are...
144
01:23Behavior of Concrete Under Compressive Load
156
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
156
01:19Expansion and Contraction in Masonry Walls
948
Masonry walls are subject to slight expansion and contraction due to variations in temperature and moisture. Thermal movement in masonry is relatively straightforward to measure and plan for. On the other hand, moisture movement poses more of a challenge. New clay masonry units typically absorb water and expand over time under normal environmental conditions. Conversely, new concrete masonry units tend to shrink as they lose the excess moisture acquired during their production process.
To...
To...
948
01:15Deformation of a Beam under Transverse Loading
285
Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...
The insights from the bending moment diagram extend to...
285
01:25Effects of Creep
136
Creep in concrete, the gradual deformation under prolonged stress, significantly impacts the integrity of structures. For reinforced concrete beams, it can be a vital design consideration, as it increases deflection, sometimes necessitating additional design measures. In columns, especially slender ones under eccentric loads, creep can cause buckling, compromising their stability. However, creep can be beneficial in indeterminate structures by mitigating stresses that arise from shrinkage,...
136
01:16Flexural Stress
242
When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to...
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to...
242