Application of the Concept of“Endowing the Old with the New”in Urban Renewal

The renewal of ancient cities is an important part of the urban renewal work in China.However,there are few studies on the general historical ancient cities at the county level in China,and there is no guidance on the renewal path.Through the practice of the renewal design project of Suining County,Xuzhou City,it makes an exploratory study on the renewal concept and mode.It first interprets the connotation and implementation path of the renewal concept of“endowing the old with the new”.Based on the texture analysis of the ancient city of Suining,it finally determines the design theme that tracing the historical context of the ancient city.Using the renewal techniques such as“extraction-transformationactivation”,through the renewal strategies such as“building new space,shaping new landscape,inheriting new culture and pregnant with new environment”,it realizes the regeneration of urban historical context and meets the needs of residents'modern life,so as to provide reference and guidance for the renovation of general historical ancient cities at the county level in China.

Experimental study on the seismic performance of staggered slab-column joints

The low-cycle loading test of two staggered slab-column-boundary beam joints was carried out to study their seismic performance.The crack development,load-displacement relationship,displacement ductility,and energy dissipation performance of the staggered slab-column joints(SSCJ)were studied.Experimental results reveal that both specimens present short-column brittle shear failure.Furthermore,an obvious hysteretic curve pinching phenomenon occurred.Thus,it can be concluded that the seismic performance of the joints is insufficient.These results suggest that the anchorage of the longitudinal reinforcement of the slab in the joint’s core area should be improved,and attention should be paid to the short-column stirrup configuration of the SSCJ.These results can provide a research basis for the design of such joints in future applications.

Experimental study on axial compressive behaviors of prefabricated composite thermal insulation walls after single-side fire exposure

The axial bearing capacity of prefabricated composite walls composed of inner and outer concrete wythes,expandable polystyrene(EPS)boards and steel sleeve connectors is investigated.An experimental study on the axial bearing capacity of four prefabricated composite walls after fire treatment is carried out.Two of the prefabricated composite walls are normal-temperature specimens,and the others are treated with fire.The damage modes and crack development are observed,and the axial bearing capacity,lateral deformation of the specimens,and the concrete and reinforcing bar strain are tested.The results show that the ultimate bearing capacity of specimens after a fire is less than that of normal-temperature specimens;when the insulation board thicknesses are 40 mm and 60 mm,the decrease amplitudes are 20.8%and 16.8%,respectively.The maximum lateral deformation of specimens after a fire is greater than that of normal-temperature specimens,and under the same level of load,the lateral deformation increases as the insulation board thickness increases.Moreover,the strain values of the concrete and reinforcing bars of specimens after a fire are greater than those of normal-temperature specimens,and the strain values increase as the thickness of insulation board increases.

Mechanical Analysis and Numerical Simulation for New Type of Dynamic Control Devices

The conventional dynamic control devices,such as fluid viscous damper(VFD)and isolating bearings,are unsuitable for the double-deck cable-stayed bridge due to a lack of sustainability,so it is necessary to introduce some high-tech dynamic control devices to reduce dynamic response for double-deck cable-stayed bridges under earthquakes.A(90+128)m-span double-deck cable-stayed bridge with a steel truss beam is taken as the prototype bridge.A 3D finite element model is built to conduct the nonlinear time-history analysis of different site categories in fortification intensityⅨ(0.40 g)degree area.Two new types of dynamic control devices-cable sliding friction aseismic bearings(CSFABs)and elasticity fluid viscous dampers composite devices(EVFDs)are introduced to reduce the dynamic responses of double-deck cable-stayed bridges with steel truss beam.The parametric optimization design for the damping coefficient C and the elastic stiffness of spring K of EVFDs is conducted.The following conclusions are drawn:(1)The hybrid support system by EVFDs and CSFABs play a good function under both seismic and regular work,especially in eliminating the expansion joints damage;(2)The hybrid support system can reduce the beam-end displacement by 75%and the tower-bottom bending moment by 60%under the longitudinal seismic excitation.In addition,it can reduce the pier-bottom bending moment by at least 45%under transverse seismic and control the relative displacement between the pier and beam within 0.3 m.(3)Assuming the velocity indexα=0.3,the parametric optimization suggests the damping coefficient C as 2000 kN·s·m-1in siteⅠ0,4000kN·s·m-1in siteⅡ,6000 kN·s·m-1in siteⅣ,and the elastic stiffness of spring K as 10000 kN/m in siteⅠ0,50000 kN/m in siteⅡ,and 100000 kN/m in siteⅣ.

Multiscale urban design based on the optimization of the wind and thermal environments:A case study of the core area of Suzhou Science and Technology City

New methods are need to coordinate the conflicting spatial demands through urban design research and strategies from the perspective of multi-scale urban climate analysis.To integrate windethermal environment with urban design,we propose three scale levels,namely the district-superblock,superblock-block,and block-building levels,and divide the urban design elements into voids and solids.Thereafter,we establish a multiscale methodological framework in which the urban design contents are clarified by each scale,and the information transmitted between scales is obtained to ensure consistent value propositions and strategic approaches.The microclimate shaping of the urban open space is transformed into guiding strategies and quantitative indicators of the spatial form of the solid space.Information is transmitted between the scales through the windethermal indicators of windward side and the morphological indicators of solid space.Subsequently,the methodology was applied to the project in the core area of Suzhou Science and Technology City,and the findings preliminarily verify the effectiveness and feasibility of the methodology.This research influences urban climate studies and urban design practice in three ways:1)improving understanding of the correlation between scales;2)facilitating interaction between the two domains;and 3)providing tools for urban design practices.

2012丽水世界博览会韩国馆设计思考

2012年丽水世博会是接着2010年上海世博会的世界博览会①。本届世博会是世界上首次举办的以海洋为主题的世博会。从而本届世博会展区里不少建筑与海洋有密切关系。韩国第一个建于大海之上的主题馆、设计外形取自多岛海风光的国际馆、仿若巨型竖琴的天塔、实现碳中和的未来型建筑——韩国馆等,主办方展馆按各自特性演绎世博会主题,参展方展馆也都大显身手,各自展现独特风采。该文即是对主要内容包括丽水世博会概况、世博会上建筑简介与韩国馆设计方案的报告。

Experiment and simulation of diffusion of micron-particle in porous ceramic vessel

The general behavior of micron-particles in the inner domain of porous ceramic vessel was simulated by computational fluid dynamics software in terms of sampling experimental data.The results show that there is an optimum porosity of 0.32 to get a higher efficiency and lower pressure drop during filtration.According to the results of simulation and experiment,it is evident that lower inlet velocity can maintain lower pressure drop and obtain higher collection efficiency and inlet concentration also has a crucial influence on the collection efficiency.The collection efficiency of equipment increases significantly with the increase of inlet concentration when the inlet concentration is less than 6.3 g/m3,but it gradually tends to be stable in the range of 97.3%-99.7%when the inlet concentration is over this concentration.

An interactive approach for generating spatial architecture layout based on graph theory

This study proposes a graph theory based method for generating three-dimensional architectural layouts on the target of creating space that provides rich perceptual experience.The proposed approach incorporates the decisions of architects in the generation process to improve efficiency and avoid invalid results.Space is interpreted as a combination of volumes adjacent to,intersecting with or containing each other and is represented by a graph with nodes and edges.The study first generates an orthogonal orientation digraph(OODG),which denotes the relative positions of spaces and provides options for users to decide whether to continue generating the layout.Based on a given OODG,a combination of connected volumes is generated.The generation results show that the proposed method can generate space providing a rich experience when relations between volumes are properly set.