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Seismic Behavior Research and Strengthening Measures of Bottom Frame--anti-seismic Wall Masonry Structure
Issue:
Volume 5, Issue 6, December 2020
Pages:
98-105
Received:
15 November 2019
Accepted:
10 January 2020
Published:
11 November 2020
Abstract: In this paper, the mechanical characteristics and seismic performance of the bottom frame anti-seismic wall structure are analyzed. According to the calculation formula given in the code, the calculation and analysis of the four story store house with the bottom one story frame are carried out. Under the minimum material strength specified in the code, the floor stiffness ratio, equivalent stiffness, wall and frame seismic action of the bottom story are calculated. At the same time, the type, the material strength and the restrained anti-seismic wall are calculated. The results show that the number of the seismic walls has a great influence on the effective stiffness of the bottom floor, the stiffness ratio between floors, the seismic action of the wall and the seismic action of the frame column, and the key influencing factors are determined. The conclusions are as follows: by increasing the concrete strength of the seismic wall at the bottom, the stiffness of the bottom floor is increased; the strength of the block is increased, and the seismic shear allocated to the column is reduced; the number of the seismic wall has a great influence on the seismic action of the frame column at the bottom. The influence of the stiffness ratio between layers is small; the use of reinforced concrete seismic wall can optimize the stiffness ratio between layers, reduce the number of the wall, and provide a reference for the selection of engineering reinforcement scheme.
Abstract: In this paper, the mechanical characteristics and seismic performance of the bottom frame anti-seismic wall structure are analyzed. According to the calculation formula given in the code, the calculation and analysis of the four story store house with the bottom one story frame are carried out. Under the minimum material strength specified in the c...
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Development of Hydraulic Continuous Shifting Devices for the Host Machine of the Tunnel Boring Machine
Shuncheng Yang,
Guo Zhou,
Dengming Hu,
Haiguo Zhang,
Hongjian Gu
Issue:
Volume 5, Issue 6, December 2020
Pages:
106-113
Received:
6 June 2020
Accepted:
2 July 2020
Published:
19 November 2020
Abstract: A powered continuous shifting device for the host machine of tunnel boring machine (TBM) is currently unavailable. Hydraulic power is the best choice of driving force source to develop the continuous shifting device which can carry 600-ton host machine in tunnel because of compact hydraulic subassemblies and efficient hydraulic control and transfer. According to the shape of the shield machine the cross section of the load-bearing platform is designed to be u-shaped and all subassemblies are placed in the left and right space under the arcuate crossbeam and four series wheels are arranged symmetrically on the outside. Hydraulic power is used to drive all hydraulic motors to make the device move and the driving wheel turn 90-degree, and push the piston in the corresponding oil cylinder, which fulfills functions such as lifting the host machine of the shield machine / TBM and turning all driven wheels 90 degrees etc. Polyurethane rubber with good comprehensive properties is used as the driving wheel coating materials to provide reliable driving force. The successful application of the device shows that its design principles and methods are feasible.
Abstract: A powered continuous shifting device for the host machine of tunnel boring machine (TBM) is currently unavailable. Hydraulic power is the best choice of driving force source to develop the continuous shifting device which can carry 600-ton host machine in tunnel because of compact hydraulic subassemblies and efficient hydraulic control and transfer...
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Application of 3D Laser Scanner to Special-Shaped Curved Curtain Wall Construction
Cao Yajun,
Che Zhiyan,
Liu Cipei
Issue:
Volume 5, Issue 6, December 2020
Pages:
114-118
Received:
21 October 2020
Accepted:
18 November 2020
Published:
22 December 2020
Abstract: With China’s economic development and improvement of Chinese people’s living quality in recent years, Chinese people have new requirements for innovative and fashionable buildings. Therefore, there are many fully special-shape and curved buildings that are measured with conventional curtain wall and are time-consuming with heavy workload emerging in endlessly. These special-shape buildings can be measured with a 3D laser scanner that is applicable to overall large-scope measurement and re-measurement, can directly shoot and scan the set scope so as to reduce measurement workload, and can be directly bound to BIM. In comparison with conventional measurement, 3D laser scanner has great advantages in special-shape curtain wall construction. 3D laser scanner has been applied to China Building Science and Technology Museum Project, CSCEC Star of Optical Valley for measurement and remeasurement and been highly recognized by the Designer, the Employer and other parties in convenience, high efficiency and other aspects. In consideration of high efficiency, convenience and bonding to BIM of 3D laser scanner in China Building Science and Technology Museum Project, can shorten the construction period and reduce the labor input, it is believed that 3D laser scanner will be the preferred measurement measure for special-shape curved curtain wall construction in the future and will be widely promoted and applied in the field and create greater value.
Abstract: With China’s economic development and improvement of Chinese people’s living quality in recent years, Chinese people have new requirements for innovative and fashionable buildings. Therefore, there are many fully special-shape and curved buildings that are measured with conventional curtain wall and are time-consuming with heavy workload emerging i...
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Application of Prefabricated Curtain Wall Sectors in Special-shaped Stadium Projects
Xiong Wei,
Gong Wang,
Liu Chang,
Ma Yong
Issue:
Volume 5, Issue 6, December 2020
Pages:
119-132
Received:
21 October 2020
Accepted:
21 November 2020
Published:
22 December 2020
Abstract: Due to complex shape and irregularity, projects of special-shaped buildings and venues are always limited by low construction efficiency and uncontrollable quality. The main form of the Application of Curtain Wall Prefabrication Scheme in Phoenix Mountain Sports Center is perforated aluminum panel curtain wall, which connects the stadium and gym through gradually varied curves, and creates the varied facade texture through metal panels of two colors (dark and light). The facade of the perforated aluminum panel curtain wall is streamlined, the overall shape is complex, with gradually varied and irregular shapes in horizontal and vertical directions, the aluminum panels are arranged in staggered seams, and the theoretical positions of the four corners are not coplanar. The number of aluminum panels is about 6000, and the number of assembled aluminum panels with different size is about 60,000. Conventional construction measures cannot meet the requirements of construction period and benefit. This paper aims to explore the application of prefabrication schemes in special-shaped curtain walls and provide relevant experience for other similar projects by studying the process of implementing the curtain wall prefabrication scheme in Phoenix Mountain Sports Center. A series of practices have proven that a large stadium can be constructed according to the integral hoisting scheme of sectors. Studies on how to design overall hoisting system for steel joist of large volume unit, how to install the steel joist of large volume unit, how to install non-coplanar special-shaped curtain wall and how to implement integral hoisting of metal roofing purlin may help to solve difficulties such as difficult construction, high cost and uncontrollable quality of large volume non-coplanar special-shaped curtain wall. Especially, studies on prefabrication construction techniques may help to simplify complex traditional bulk construction procedures, save time, improve work efficiency and reduce construction costs.
Abstract: Due to complex shape and irregularity, projects of special-shaped buildings and venues are always limited by low construction efficiency and uncontrollable quality. The main form of the Application of Curtain Wall Prefabrication Scheme in Phoenix Mountain Sports Center is perforated aluminum panel curtain wall, which connects the stadium and gym th...
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Research on Construction Technology for Prefabricated Stone Curtain Wall Base Keel
Luo Zhenglin,
Zhang Haibin
Issue:
Volume 5, Issue 6, December 2020
Pages:
133-148
Received:
25 October 2020
Accepted:
20 November 2020
Published:
22 December 2020
Abstract: For outer wall maintenance, the stone curtain walls are arranged on the edge of the construction accesses. There are many cross operations and high risks of construction safety. The disadvantages includes limited construction period, site constraints, local weather conditions, pedestrians and trucks. In case of construction with traditional methods, it will be necessary to close the on-site accesses most of the time, which hinders mobilization of the materials and cross-operation of other organizations and makes construction impossible in rainy days. In addition, there is high safety risk, and the work efficiency and construction period will be greatly affected. In order to ensure safety and the construction period, prefabricated base keels were planned for construction based on the site investigation and analysis. These keels were transported and installed intensively in different periods of time, so that the safety factor was significantly increased and the work efficiency was met. After prefabricated base keels were used for project construction, the stone base keels were completed successfully as scheduled. In terms of the selection of measures, construction progress, and quality, this project has won unanimous praise from the Owner and all parties. After the acceptance of the project, the stone base keels were determined as an excellent subdivisional work.
Abstract: For outer wall maintenance, the stone curtain walls are arranged on the edge of the construction accesses. There are many cross operations and high risks of construction safety. The disadvantages includes limited construction period, site constraints, local weather conditions, pedestrians and trucks. In case of construction with traditional methods...
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Summary of Color Difference on Exterior of Stainless Steel Buildings
Zhenglin Luo,
Yaoheng Wang,
Lin Huang
Issue:
Volume 5, Issue 6, December 2020
Pages:
149-157
Received:
27 October 2020
Accepted:
20 December 2020
Published:
22 December 2020
Abstract: The color of stainless steel surface is mainly determined by its own material or substance attached to the outer face of stainless steel. It can be roughly classified as follows: 1. Color of stainless steel itself or the unique outer surface color after physical processing such as polishing, frosting, drawing and sand blasting. 2. Attach a thin layer of other metals or alloys to the surface of stainless steel object with different chemical electrolysis principles to make stainless steel show specific color and promote the enhancement for corrosion resistance of stainless steel. 3. The outer surface of stainless steel is exposed to the natural environment, the metal (steel component) in contact with the air or natural environment (temperature, air, time, surface roughness, etc.), thus a layer of oxide will be oxidized on its surface, which tends to gradually become the same color. The characteristics of stainless steel include durability, little maintenance required, long service life, and scientific and modern appearance. The curtain wall of Science and Technology Museum of Start of Optics Valley is made of stainless steel, which also avoids light pollution caused by stainless steel surface to the surrounding environment. The architect performed physical sandblasting on exterior to form diffuse reflection on the surface. On the outer surface with countless tiny concave potholes of stainless steel after sandblasting, the change in stainless steel color of building exterior was caused by the change in angle and light of plates. In this regard, the changes in surface color of stainless steel were tried to improve by consulting relevant experts in stainless steel materials and performing a lot of related tests. This article includes detailed records and analyses of the process. Readers may therefore be inspired to avoid or solve similar problems in similar curtain wall with stainless steel surface.
Abstract: The color of stainless steel surface is mainly determined by its own material or substance attached to the outer face of stainless steel. It can be roughly classified as follows: 1. Color of stainless steel itself or the unique outer surface color after physical processing such as polishing, frosting, drawing and sand blasting. 2. Attach a thin lay...
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