Yan G.,Shanghai University |
Liu W.-G.,Shanghai University |
Zhang J.,Shanghai Institute of Architectural Design and Research |
He W.-F.,Shanghai University
Applied Mechanics and Materials | Year: 2014
The wind-induced vibration control and analysis of a super high-rise structure located in the area of strong typhoon with viscous damping walls is introduced. Mechanical properties and design method of viscous damping wall are described, and then the arrangement scheme is put forward. The performances of structure with and without viscous damping walls under the condition of basic wind strength encountered once for 10 years are investigated in detail. The results show that the control scheme can dissipate energy of wind-induced vibration, attenuate structural dynamic response and reduce the mutation of acceleration along height direction effectively. The maximum peak acceleration can be reduced by 23.5% to 0.241m/s2, which meets 0.25m/s2 limit value stated by Technical specification for concrete structures of tall building. Therefore, the arrangement scheme is feasible and effective to control wind-induced vibration and improve structural safety and comfort. © (2014) Trans Tech Publications, Switzerland.
Shi W.,Tongji University |
Shi W.,Shanghai Institute of Architectural Design and Research |
Tong L.,Tongji University |
Chen Y.,Tongji University |
And 2 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2012
For the assessment of the influence of corrosion on behavior of residential steel structures, firstly, indoor salt spray accelerated corrosion tests of Q235B steel with and without coating respectively were carried out for 6400 hours at most, which resulted in the corrosion depth equal to 50-year corrosion in Shanghai according to existing record. Secondly, mechanical property of these steel was tested. Thirdly, indoor salt spray accelerated corrosion tests on two groups of welded H-section beams with and without coating respectively were performed for 2400 hours at most, which resulted in the corrosion depth equal to 20-year corrosion in Shanghai according to existing record. Finally, static load bearing capacity of these beams was examined. The relationships of yielding strength, tensile strength and elongation respectively with mass loss rate for steel subjected to corrosion were given using the method of least squares. The current investigation indicates that for the H-section beams with coating subjected to 2400-hour corrosion, their load bearing capacities decrease significantly, and the corresponding deflections increase obviously. It is found that the plate thickness is an important factor influencing the behavior of H-section beams subjected to corrosion after a comparison between the two geometrical parameters of plate thickness and the surface area per length. The thinner the thickness of a flange or a web is, the more load carrying capacity decreases and the more deflection increases.
Ma F.,Shanghai Institute of Architectural Design and Research |
Ma F.,Nanjing Southeast University |
Zhang Z.,Nanjing Southeast University |
Li A.,Nanjing Southeast University
Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis | Year: 2013
Large-span steel plates will produce vibration to affect the normal use under crowd load excitation. The vibration condition of large span steel structure floor of a railway station is analyzed under the crowd load. Tuned mass damper (TMD) system and fluid viscous dampers are installed in the middle span of steel beam located. The crowd load considers different person densities, different walking frequencies. Dynamical analysis and results prove that the vibration energy dissipation can effectively reduce the resonance response of the large-span floor structure. The mean ratio of vibration reduction rate comes up to 16.86% of all cases, and the reduction rate of resonance case exceeds 38% with crowd all synchronous model. The reduction rates are 15.50% to 15.80% at different density conditions with walk frequencies normal distribution model. This verifies the correctness of the load simulation method of walk frequency normal distribution model and provide theory basis for practical engineering design.
Chen S.,Tongji University |
Shi X.,Shanghai Institute of Architectural Design and Research |
Zhou Y.,Tongji University
Proceedings of the Institution of Civil Engineers: Structures and Buildings | Year: 2015
A finite-element model is proposed to simulate the load behaviour of composite slabs with studs as end anchorages. The model is verified against physical tests on 36 composite slabs with varying thickness of steel deck, diameter and height of the studs, concrete strength and length of shear span. The longitudinal shear strength contributed by the end anchorage is evaluated and compared with the design shear strength of individual studs proposed in different design codes. The contribution of studs as end anchorages to the shear-bond strength of composite slabs is found to be substantial and should be considered in design assessments. A tentative design method to evaluate the strength of composite slabs with end-anchorage studs is proposed. © ICE Publishing: All rights reserved.
Chen J.,Tongji University |
Peng Y.,Tongji University |
Zhao X.,Shanghai Institute of Architectural Design and Research
International Journal of Space Structures | Year: 2011
This paper investigates the depropping procedure of a large span single-layer dome-shape latticed shell roof structure through numerical analysis and field measurements. The depropping procedure consists of six steps. For each step, the joint displacements and member internal forces of the roof structure were first predicated using a numerical model. Based on the simulations results, instruments as vibrating wire strain gauge, total station, accelerometer and global positioning system (GPS) were installed on the structure to monitor the actual displacements and variations of structural members' internal forces during the depropping procedure. The GPS data are compared with total station measurements to learn its applicability for monitoring depropping procedure of large roof structure. The comparison between the numerical results and field measurements demonstrates that the suggested simulation method is reasonable in the sense that the variation trend of deflection and internal forces of the structure can be captured. The GPS technology gives more accuracy measurements in horizontal displacement than vertical deformation. A combination of GPS technology and total station can increase the displacement measurement accuracy.
Peng Y.X.,Tongji University |
Zhao X.D.,Shanghai Institute of Architectural Design and Research |
Chen J.,Tongji University
Proceedings of the 2nd International Postgraduate Conference on Infrastructure and Environment, IPCIE 2010 | Year: 2010
A numerical simulation of the structural system transformation process in the construction of a long - span space structure is carried out, and instruments as strain gauge, total station, GPS and ccelerometer are used to monitor the displacement and the internal force during construction stage. Through the comparison between measured results and numerical analysis, the suggested simulation method is proved to be reasonable. Then the application of GPS technology in long-span space structure construction monitoring is discussed. The conclusion of this article can provide the basis to the simulation and monitoring of construction of similar structures.
Hu Z.,Shanghai Institute of Architectural Design and Research |
Qian J.,Tongji University |
Zhou C.,Shanghai Institute of Architectural Design and Research
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2010
A column in the first floor of one super high-rise building can not extend to the basement and there is a gap of 1.4 m between the upper column and the down column. The vertical load from the upper column is so great that SRC beam-transfer-storey with little offset malposition colomn is designed here and the load can be transferred to the down column. Because this kind of transfer-storey joint is very complicated and the force transmission is not very clear, the transfer-storey joint bearing performance is hereby studied. According to ANSYS numerical analysis and the bearing-capacity test on 1/5 scale models, the strains and the stresses on either section steel or rebar or concrete are known and the cracks on the surface of concrete, the deflection of the transfer-girder are found. Under the design load, structure designs of the transfer-storey joints meet the demands of carrying capacity and normal working. Under the combination load with large earthquake, many cracks appear on the transfer-storey joint while it can keep on bearing. The study shows that the failure region of the transfer-storey is the joint zone on the transfer-girder enclosed by the upper column and the down column. The ultimate load is determined by the concrete cracking of the joint zone. The design rules of SRC beam-transfer-storey with little offset malposition colomn is the requirements of ductility and ultra strength for the joint.