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2018-07-16
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The FRP (Fiber Reinforced Polymer) engineering project "Enhanced Load-Bearing and Fire Resistance of Fiber Composite Material Structural Components" (TDA1-1), funded by the Innovation Fund of the Non-Metallic Materials Innovation Center in 2022, showcases a significant advancement in the application of ultra-lightweight, large-scale composite material pultruded profiles. The utilization of these pultruded profiles in the external frame beams of high-rise buildings in Qingdao represents a groundbreaking success.
The GFRP (Glass Fiber Reinforced Polymer) materials supplied by Nanjing Spare Composite Yizheng Co., Ltd., are designed by the collaborative efforts of Vanke Green Research & Development Co., Ltd., and Beijing University of Technology. The main beams are built with 800 * 300 large rectangular tubes, the span of the beam is 17 meters and with height of 2.8 meters. The upper and lower beams weigh a total of 1.2 tons. The weight of the profile is approximately 33kg per meter.
Addressing critical issues such as the substantial weight, high cost, safety risks, severe corrosion, and maintenance difficulties associated with traditional steel frame beams in Qingdao's coastal high-rises, the project team innovatively developed a new type of external hanging frame beam. By employing composite material pultruded profiles, the team not only met the required structural strength and rigidity but also achieved a remarkable 75% reduction in the weight of the structure, ensuring the smooth implementation of the project.
The pultruded profiles used include main beams (three-cell box-shaped), columns (single-cell box-shaped), and grates (single-cell box-shaped), composed of glass fiber and unsaturated polyester resin, with a fiber mass content of about 70%. These materials were produced and prepared by the project team's Nanjing Spare Composite Yizheng Co., Ltd.
Compared to steel frame beams, the pultruded profile structure's self-weight is reduced by approximately 75%. This significant weight reduction not only lowers the load requirements on engineering machinery and eases spatial demands on the construction site but also enhances installation efficiency, saving on labor and time costs. According to calculations by the design and construction units, the pultruded profile approach can save about 5 million RMB in measure costs for the project.
The pultruded FRP beams boast remarkable attributes such as lightness, high strength, and corrosion resistance, demonstrating vast potential in domestic and international civil engineering construction. Their application is an ideal of innovation, offering a viable alternative to traditional materials and methods, signifying a stride towards more sustainable and cost-effective construction practices.