工业与民用建筑设计；文物保护工程勘察设计；装饰设计、建材（陶瓷、砖瓦、铸石、水泥）工厂全套设计、工程总承包；城市规划设计；建筑工程项目和建材工程项目的评估；配电设备设计及制造；市政、人防、商业、物资、航空航天工程设计研究；工程地质勘察；岩土工程施工；工程招标代理；工程造价咨询；施工图审查；房屋租赁；旅游规划设计；全过程工程咨询。（依法须经批准的项目，经相关部门批准后方可开展经营活动）
The interfacial bonding strength and failure mechanism of magnesium phosphate cement(MPC)mortar and ordinary concrete(NC)are very important for the structural performance of MPC mortar to reinforce NC.In this paper,the double-sided shear test was used to study the influence of four different interface types on the bonding properties of the MPC mortar-NC interface,the failure process of the specimen was observed,the relationship curve between the bond strength and the slip amount was obtained,the failure mode and failure mechanism of the specimen were analyzed.The effects of curing ages(7 days and 28 days)as well as different compressive strengths(60 MPa and 55 MPa)on the inter-face bonding properties were compared.On the basis of theoretical analysis and combined with the experimental data,a calculation formula for the shear capacity of the bonded interface was proposed,suitable for different interface treatment conditions.In addition,a two-line constitutive model was estab-lished for the non-planting interface,and a three-line constitutive model was developed for the planting interface.This study provides theoretical support and design basis for the application of MPC in struc-tural reinforcement engineering.
The spatial pattern of"mountain-water-city"is the spatial organization relationship formed by the interactive adaptation of urban artificial environment and natural landscape envi-ronment.By clarifying the conceptual connotation of the"mountain-water-city"spatial pattern,this paper establishes its analysis framework from the perspective of geography.Wanzhou,a typical city,is selected as the research area,and the evolution process,growth model,formation mechanism and optimization regulation of the"mountain-water-city"spatial pattern in the Three Gorges Reservoir Area(TGRA)are comprehensively studied by using field investiga-tion,topographic position index and MCR model.Therefore,the research results are as follows:(1)The evolution of the"mountain-water-city"spatial pattern in the TGRA is a spiral upward cycle of"generation,strengthening,deconstruction and reorganization".The elements,structur-al forms and regional functions of the"mountain-water-city"spatial pattern in Wanzhou are constantly evolving and reorganizing under the comprehensive effect of the opening of the port to the outside world and the relocation of the Three Gorges Project.(2)The impact and feed-back of urban expansion on landscape ecological network in the TGRA,as well as the restric-tion and guidance of landscape environment changes on urban spatial growth,formed a unique"mountain-water-city"spatial pattern and growth model,including 6 dynamic growth models and 12 static growth models.(3)The reconstruction of regional spatial organization relations and the selection of urban systems determine the formation and evolution of"mountain-water-city"spatial pattern.Driven by the comprehensive drive of"natural landscape environment+so-cial and economic transformation"and"regional special events+landscape and environmental changes",the urban spatial growth in the TGRA gradually breaks through the physical thresh-old and continues to evolve in the next stage of growth cycle.Finally,this paper puts forward the regulation path of"mountain-water-city"spatial pattern in the TGRA,which provides sup-port for the integrated promotion and systematic governance of mountain,water and city.
A new type of assembled beam-column joint is proposed,in which the frame beam is connected to the frame column by means of a top-bottom L-shaped member to achieve fully bolted assembly construc-tion.In this paper,based on the experimental study,the ABAQUS finite element analysis software is used to carry out an extended parametric analysis of this new type of assembled joint to study the effect of the joint design parameters on the force performance of the assembled beam-column joint with top-bottom L-shaped member.First,the finite element analysis model of the specimen was established to verify the accu-racy of the finite element analysis process.Then the form of the L-shaped member of the joint,the thick-ness of the vertical plate of the L-shaped member,the thickness of the horizontal plate of the L-shaped member,and the length of the horizontal plate of the L-shaped member were considered.The results of the study are intended to provide engineering suggestions for the design and optimization of assembled beam-column joints with top and bottom L-shaped members.
In order to realize the weak axis connection of the H-shaped steel column of the steel frame,de-signs a cantilever section H-shaped steel beam-column weak-axis top and bottom L-shaped parts to connect the steel frame,and the thermal insulation decorative lightweight wallboard is used as the enclosure struc-ture to hang on the steel frame.The seismic test was carried out on one-bay,one-story and 1∶2 scaled specimens,and the overall failure mode,bearing capacity,stiffness and energy dissipation capacity of the structural system were analyzed,the overall performance of the externally mounted lightweight wallboard system was evaluated.The results show that the failure mode of the fully bolted weak axis connection steel frame of the external lightweight wall panel is reasonable,the wall panel system is stable,and the L-shaped connection node realizes the outward movement of the plastic hinge of the beam end.The hysteresis curve of the structure is full,and the skeleton curve is S shaped.The positive yield displacement and ultimate bearing capacity are 27.08 mm and 351.99 kN,respectively,and the negative direction is 19.78 mm and 377.43 kN,which meet the requirements of structural ductility and bearing capacity.The plastic stiffness of the specimen degrades slowly,the maximum damping ratio reaches 0.35,and the overall energy dissipa-tion performance is better.The dry-hanging form of the external wall panel and the full-bolt connection method of the steel frame together improve the efficiency of building assembly.
A lateral force-resisting structure known as a coupled steel plate shear wall structure is created by connecting two steel plate shear walls together with steel coupling beams.In this paper the seismic performance of the structural system was studied from the perspectives of the hysteresis curve,the skeleton curve,ductility,bearing capacity,stiffness degradation,energy dissipation capacity,etc.Through the quasi-static test of a 1/3 scale 4-story coupled steel plate shear wall specimen,the yielding sequence and deformation mode of the specimen were analyzed.The results show that the ductility coefficient of the coupled steel plate shear wall specimen is 5.03,the bearing capacity degradation coefficient is larger than 0.96,the bearing capacity and stiffness degradation are stable.The equivalent viscous damping coefficient is more than 0.25,which indicates that the coupled steel plate shear wall has excellent seismic performance.The coupling beam yields firstly during loading,followed by the wallboard,which firstly buckles before yielding,and then the column base and beam.The coupling beam's addition altered the structure's yield mechanism,enhanced overall ductility and energy dissipation capacity,and can create several seismic fortification lines,resulting in an overall specimen that now exhibits a reasonable failure mechanism.The entire lateral displacement curve is deformed by bending and shearing.The experimental research offers a reference for future research and application of coupled steel plate shear wall structures,and is more appropriate for the implementation of coupled steel plate shear wall structures in actual projects.
