Base on the high-strength bolt connection push-out test results, indicators such as anti-slip load, initial shear stiffness, post slipping stiffness, and ultimate shear bearing capacity that characterize the shear performance of high-strength bolts were defined reasonably to compare the shear performance of high-strength bolts in push-out specimens and beam specimens. On the basis of reasonable definition of shear performance indexes, the shear performance indexes of high-strength bolts in push-out specimens and beam specimens were compared by establishing fine three-dimensional finite element models of push-out specimens and beam specimens. The results showed that the high-strength bolts had similar anti-slip load (about 57 kN) and initial shear stiffness (about 560 kN/mm) in the composite beams and the push-out specimens. Meanwhile the post slipping stiffness of the high-strength bolts in the compositr beams increased by 42.3% and the ultimate shear bearing capacity increased by 3.9%. Therefore, it is safe and feasible to analyze the shear performance of high-strength bolts in composite beams using the results of test specimens.

This paper investigated the dynamic stability of reticulated shell structures under unsteady wind load. The parametric vibration equation of the reticulated shell under unsteady wind load was established according to the mode superposition method, from which the dynamic instability region and the wind-induced vibration responses were solved. Effects of different parametric excitation of the dynamic stability of the reticulated shell were discussed in detail. It is found that the unsteady wind load could not only cause the parametric vibration of the reticulated shell, but also the dynamic instability region with similar frequency would interlap and thus lead more intense vibrations to the reticulated shell. In particular, the parameter vibration of the reticulated shell could be effectively inhibited by changing the damping of the structure, and the safety of the structure could thus be improved.

In order to analyze the bond slip characteristics of basalt fiber-reinforced steel bars and the long-term bond slip time-varying behaviors of reinforced concrete exposed to marine environments, the effects of bar size, corrosion age, and concrete strength of the Basalt fiber-reinforced polymer (BFRP) on the bond slip behavior of BFRP bars in concrete under artificial seawater were studied. An improved Bertero-Popov-Eligehausen (BPE) model was used to describe the bond slip behavior of BFRP bars. The results showed that as the diameter of BFRP bars increased, the ultimate bond strength and corresponding slip between BFRP bars and geopolymer concrete gradually decreased, and the ultimate slip and corresponding bond strength also gradually decreased. After 90 days of seawater corrosion, the ultimate bond strength and corresponding slip decreased, and the bond slip curve showed a horizontal section. Improving the concrete strength grade was beneficial for improving the bond performance between BFPR bars and concrete in seawater environment. The improved BPE model was more suitable for characterizing the bond slip between BFRP bars and concrete. After seawater corrosion, the rising section of the curve tended to be more rigid, and the falling section of the curve tended to be more flexible.

To explore the influence mechanism on the strain rate effect of concrete compressive strength for rubber particles, a split Hopkinson pressure bar (SHPB) with a diameter of 100 mm were used. The dynamic compressive performance and strain rate effect of rubber concrete (with the rubber content of 10%, 20%, and 30%) were obtained. Besides, the reasons for the difference in strain rate effect between rubber concrete and ordinary concrete were analyzed. The experimental results showed that the dynamic increased factor (DIF) of rubber concrete increased with the increase of strain rate. Furthermore, the failure mode analysis showed that the particle size of all post-tested specimens gradually decreases with the increase of strain rate. At similar strain rates, ordinary concrete has more cracks than rubber concrete. Rubber particles can slow down damage accumulation and increase deformation hysteresis effect when compared to ordinary concrete, resulting in the increase of strain rate sensitivity for concrete compressive strength.

Aggregates are the most stable component in concrete, and their particle shape has a significant impact on the comprehensive performance of concrete. In order to find an accurate and quantitative method for describing the particle shape parameters of aggregates, digital graphic processing technology (DIP technology) was used to study the particle shape of coarse aggregates from moderately weathered granite in this article. The feasibility and accuracy of using DIP technology measuring method was proved by comparing and analyzing the detection data using vernier calipers and DIP technology. The analysis shows that each parameter of aggregate particle shape obeys the law of normal distribution, and verifies the law that different particle sizes of crushed stone aggregate produced by the same parent rock and the same production process have the same particle shape parameter. The research method and conclusions based on the coarse aggregate shape of moderately weathered granite, which has reference value for local practical engineering and can also be used for studying the particle shape of other regional engineering or other rock mass aggregates.

The ozone fluidized bed reactor is a multiphase reactor with a series of advantages such as simple structure, low manufacturing cost, easy maintenance and operation, and low energy consumption. In order to find the parameters that can make the ozone fluidized bed better play its advantages in water treatment, a research model of the gas flow circulating reactor based on physical model experiments and computational fluid dynamics methods was built, and the experimental data were compared with the numerical simulation results. Results indicated that the numerical simulation gave a good indication of the fluid flow characteristics inside the ozone fluidized bed. Subsequently, based on numerical simulation, the internal flow field of the ozone fluidized bed was analyzed, and the effects of parameters such as height to diameter ratio, bottom inclined plate angle, and ozone input velocity were further studied. The study found that at a height to diameter ratio of 3, a bottom inclined plate angle of 45 degrees, and an ozone input velocity of 0.05 m/s, the ozone fluidized bed model can best demonstrate its excellent water treatment capacity and high economic efficiency, making sewage treatment technology more efficient and environmentally friendly.Therefore, this method could accurately find the parameters that enabled the ozone fluidized bed reactor to exert its better treatment capacity by creating a model and performing numerical simulation analysis.

In order to better predict the settlement of foundation, a simple calculation method-hyperbolic model method was introduced, in which hyperbolic function was used to reflect the nonlinearity of foundation settlement, and in order to avoid the parameter error caused by sampling disturbance of foundation soil, in-situ soil plate loading test was proposed to determine the model parameters. This method was applied to the settlement calculation of a raft foundation. The results showed that the model calculation results are in good agreement with the measured results, which proves that the in-situ soil hyperbolic model method is feasible for the nonlinear settlement calculation of foundation.

To support the “carbon neutrality” goal, green buildings should be the development direction of the construction industry. This article analyzed the incremental costs and benefits of energy-saving technologies adopted in green campus buildings by comparing them with a “baseline building” using actual data from the Guangdong Technion-Israel Institute of Technology (North Campus) project. It was found that energy-saving technologies accounted for 78.19% (residential area) and 71.72% (educational area) of the incremental costs in green campus building technology. Campus electricity records indicated that energy-saving technologies could bring significant economic benefits and reduce operational costs over the lifespan of the buildings.

In the context of “rural revitalization”, resilience assessment is an important foundation for rural sustainable development. In order to quantitatively evaluate the rural development, taking western Guangdong as an example, a comprehensive evaluation index system of rural resilience was constructed from four dimensions of ecology, society, human resources and economy. By analyzing the spatial differences of rural development resilience in western Guangdong, the main factors affecting rural resilience were identified, and optimal governance strategies were proposed on this basis. The results showed that: (1) The areas with high resilience were distributed in the suburban villages of Jiangcheng District, Maonan District and Potou District, and the radiation capacity of the municipal districts affected the development of rural areas. (2) The resilience development of different rural areas in different dimensions was uneven, and the better developed rural areas tended to develop in an all-round way. (3) The level of economic development was the primary factor affecting the level of rural resilience. Finally, the strategies and measures were proposed to improve rural resilience and promote rural development in four dimensions, in order to provide theoretical and technical support for high-quality rural development.

Under the background of rural revitalization strategy and “dual carbon” goal, rooftop photovoltaic can optimize rural energy structure, energy conservation and emission reduction, coordinate the orderly development of economic, social and environmental benefits, and accelerate the pace of rural modernization and urbanization in Lingnan rural area. The current situation of Lingnan's built environment, photovoltaic power generation system, the advantages of combining rural residential buildings and photovoltaics in Lingnan, and the actual installation methods and related points of rooftop photovoltaic suitable for residential buildings in Lingnan were reviewed. The development prospect of rural rooftop photovoltaic was prospected.