Publications

Summary The main lateral load‐carrying components of lightweight glued laminated bamboo (glubam) structures are shear walls. It is essential to understand lightweight glubam shear walls' performances to assess lightweight glubam structures' overall performance. A simplified numerical model was developed to predict the nonlinear response of lightweight glubam shear walls and structures. Based on the assumption that (1) the panel‐frame connectors govern the lateral resistance of the lightweight frame shear walls due to the high in‐plane shear stiffness and strength of the sheathing panel, (2) the out‐of‐plane bulking of the sheathing panel is avoided through the frame and the connections between them, and (3) the resistance capacity of the frame is negligible, the numerical model was developed based on the connection test information. Glubam nail connection tests were conducted considering different nail types and loading directions. The corresponding simplified hysteric wall model is composed of two kinds of input parameters. First are the parameters determining the wall's envelope curve under monotonic loading conditions, which regulate the hysteresis rules. The parameters related to the envelope curve are obtained through the modeling results of the nonlinear static analysis of the shear wall, whereas those related to the hysteresis rules are estimated through the connection test information. The influences of different nails, wall sizes, and openings on the walls' behavior are evaluated based on this simplified model. Based on the numerical simulation results of shear walls, the seismic performance of a glubam house was assessed.

Major design is carried out on novel shear wall system.Meanwhile,lightweight aggregate concrete and heat preservation formwork without demoulding are successfully developed.Mechanical test of this new lightweight aggregate concrete is mainly made.Finite element analysis software-ANSYS is also used for numerical mechanical analysis of monolithic shear wall.Test and structural analysis show this new shear wall system can be applied in practical work.

Firstly, CH₄ would be activated to CH₃OH, subsequently, CH₃OH and O* reacted to generate HCOO⁻. Finally, the HCOO⁻ further reacted with NO₃⁻ which was completely converted to CO₂, H₂O and N₂.

In order to create a reinforced concrete shear wall structure with good energy dissipation and resilience，a kind of ultra-high performance concrete RPC （Reactive Powder Concrete） shear wall structure composed of ordinary reinforcement and CFRP （Carbon Fiber Reinforced Polymers） was presented. A nonlinear finite element model using nonlinear finite element software DIANA was established to analyze the seismic performance of reinforced concrete shear walls. The applicability of the model was verified by the test results in this paper and other references. Based on the constructed model，the seismic behavior of normal concrete and RPC shear walls with different reinforcement types was analyzed. The results showed that，in terms of the analyzed situation，the ductility coefficient of reinforced RPC shear wall was increased by 42% when compared with that of reinforced concrete shear wall due to the better ductility of RPC material. Compared with reinforced concrete shear wall，the energy dissipation capacity of RPC shear wall reinforced with CFRP bars for wall and ordinary reinforcement for side columns was increased by 51%，the ductility coefficient was increased by 30%，and the self-resetting capacity coefficient was increased by 25%. It is verified that the proposed hybrid reinforced RPC shear wall structure system has good comprehensive seismic performance. The reinforcement ratio of CFRP longitudinal reinforcement in shear walls with mixed reinforcement should be between 0.5 and 1.0 of ordinary longitudinal reinforcement in side columns. Keywords: reactive powder concrete (RPC),  carbon fiber reinforced polymer (CFRP),  shearwall  finite element analysis,  seismic performance

This paper provides a state of the art summary on the innovations and development in engineered bamboo materials and manufacture, mostly in recent ten years. The definition of engineered bamboo structures is given first as all the structures with components using bamboo as the main materials. However, the main topics discussed in this paper is on engineered bamboo structures with modifying the original round bamboo culm and mainly in the form of bamboo fiber/bundle or strips reinforced composites. Three types of engineered bamboo, plybamboo, laminated bamboo and bamboo scrimbers can be categorized and discussed in the paper. The most recent development on cross laminated bamboo and timber or CLBT is also introduced. A brief review shows that the scientific publications are increasing dramatically since the first conference on modern bamboo in 2007.

The stress distributed in the mid-bondline of the joints made of aluminium alloy and an epoxy adhesive was determined with the ANSYS software. The results from the FEA showed that the values of the peak stresses of the all the stress components (including the longitudinal stress Sx, the peel stress Sy, the shear stress Sxy, the 1st principal stress S1 and the von Mises equivalent stress Seqv) distributed in the mid-bondline are changed a little as the notch distance L was increased while the notch depth d was not great than 0.6mm. But the evidently changes occurred when the notch depth d was great than 0.9 mm for the stress Sx, Sy and S1 distributed in both the mid-bondline and the interface of the lap zone. When taken the stress distributed in the middle part of the lap zone into account, the peak stress at the point in the mid-bondline corresponding to the edge of the notch decreased firstly and then increased again as the notch distance L was increased from 0 mm to 8 mm. The proper geometry of the notch in the specimen was chosen by finite element analysis.

Five forms of nitrogen were designed in field study where tissue structure of flue-cured tobacco leaves was observed and tar delivery of unblended cigarette was determined to study growth characteristics of tissue structure in flue-cured tobacco leaves. Results showed that: 1) tar delivery of unblended cigarette reduced with the increase of nitric nitrogen;2) leaf blade, palisade cell and spongy tissue treated with nitric nitrogen were thicker than those with ammonium nitrogen. 3) tar delivery was significantly negatively correlated with leaf blade and spongy tissue thickness, yet non-significant with palisade tissue thickness. In conclusion, palisade tissue thickness had direct effect on tar delivery and therefore was affected by different forms of nitrogen.

Software problems – problems whose solution is software-intensive – come in many forms. Given that software and computers are deeply embedded in society, one general characteristic of software problems is that their early requirements are expressed ‘deep into the world’, that is, in terms that end-users and other stake-holders would recognise and understand. The developer is left with the difficult task of interpreting such requirements closer to the software solution.Problem reduction is proposed as a systematic transformation for deriving specifications from requirements in the context of problem-oriented analysis. It allows the context of a problem to be simplified while re-expressing the requirement. It was applied in the context of Problem Frames and argued that it can be used as a systematic way of deriving specification statements from requirement statements via a sequence of transformed problems. The approach is illustrated in two examples.

Distance-decay models are fundamental to accessibility modeling; yet their alignment with actual travel behavior remains insufficiently examined in empirical terms. To help address this gap, we propose a dual-component Tanner–Gaussian decay model that seeks to mitigate two key limitations of traditional accessibility frameworks by simultaneously describing the phenomena of full decay and local peaks. The model is calibrated using survey data from an urban park in Hangzhou, China, and subsequently assessed on two additional datasets from Wuhan and Shanghai. Results indicate that: (1) traditional Gaussian functions may overestimate short-distance and underestimate long-distance accessibility, while Tanner functions tend to capture long-tail decay more effectively and appear more suitable for long-distance accessibility estimation; (2) the proposed dual-component model performs favorably in large samples, though its stability appears sensitive to sample size. By comparing the application of multiple accessibility models across three datasets, we highlight how their suitability varies depending on the specific context. This comparison may offer a reference that could assist designers in identifying underserved areas and supporting more equitable access to urban green spaces in the context of rapid urbanization.