In recent years,with the continuous improvement and innovation of assembled building technology system,modular integrated building has become an important direction of assembled buildings.Based on the first domestic nearly 100-meter-height modular integrated high-rise residential project,the innovation of the MiC technological application is introduced,also the impact of concrete modules on the structural stiffness and then the seismic performance of the structure are analyzed.The results show that it is appropriate to take 0.8 as the period reduction coefficient in the structural design to reflect the impact of modular shells on the structural stiffness.The shear wall is basi-cally undamaged under the strong earthquake,and most of the coupling beams are severely damaged,meeting the structural performance goal.The tensile stress of the slabs around the core tube and the weak connection is larger than that of the slabs in other areas,so the slabs should be strengthened during design.The weak connection slabs can meet the requirements of structural bearing capacity in the case of considering strengthening details.
BIM technology has brought new opportunities for the digital transformation of the construction industry.Aiming at the difficul-ties of the landing application of intelligent construction technology in the construction process of building projects,the typical application scenarios of intelligent construction technology at home and abroad are analysed and researched,and combined with actual project application cases are demonstrated.Through the demonstration,it verifies the information advantage,visualisation advantage and engineering integrated management advantage shown by the digital technology represented by BIM in the design and construction stage,digital processing and engi-neering progress control.
Taking the large-span intersecting beam string roof of a gymnasium in Zhuhai as the background.Analyzed and studied the technical problems faced during the roof construction process.Using Midas software for finite element three-dimensional simulation analysis.Dynamic simulation analysis of deformation of cross beam string under various working conditions.Optimized the sequence of prestressed ten-sioning and roof concrete pouring.Optimized the prestressed tensioning sequence and roof concrete pouring sequence to solve a series of problems caused by load superposition that affect construction quality and production safety.The deformation monitoring data of the beam string roof is consistent with the finite element simulation analysis results.
Introduces a performance target reinforcement and renovation design method for a commercial building complex to be trans-formed into a medical building through engineering examples,solving the problem of insufficient seismic structural measures due to the in-crease in seismic fortification categories in high-intensity areas.Based on the third-party inspection and appraisal report,and based on the cal-culation and performance analysis results,the original structural components such as frames,shear walls,floors,etc.are reinforced using methods such as steel bonding,carbon fiber cloth,and expanded cross-section.After practical engineering verification,the reinforcement plan is feasible in construction,reliable in nodes,and has clear force transmission,which can ensure the overall work of the new and old struc-tures,and can serve as a reference for similar engineering projects.
Taking a multimodal transportation perspective,analyzes the current state of domestic and international port logistics transporta-tion.Building upon the concept of adaptive design for port logistics buildings,presents a case study of Guangzhou Nansha International Lo-gistics Center(North Zone)and proposes adaptive design strategies for port logistics buildings based on the multimodal transportation model.The objective is to optimize port logistics operations and improve the utilization efficiency of port logistics buildings,providing valuable refer-ences for modern port logistics building design.This research contributes important theoretical and practical value in exploring innovative de-sign approaches for port logistics buildings.
The minimum clear distance between the intersection bridge pile foundation and the shield tunnel is only 0.8 m.In order to analyze the influence of tunnel construction on the bridge,firstly simulates the tunnel construction process,and then checks the bridge ac-cording to the simulation results and control values.The results show that:①the settlement and horizontal displacement of pile foundation are within the control value range,which can meet the Specifications for Design of Foundation of Highway Bridges and Culverts:JTG 3363-2019[1]requirements;②Pile foundation settlement has little influence on beam shear force and mid-span bending moment,but great influ-ence on end negative bending moment.Secondly,under the condition of controlled settlement 10 mm,the bending resistance,shear capacity and crack width of the beam meet the Specifications for Design of Reinforced Concrete and Prestressed Concrete Highway Bridges and Cul-ver:JTJ 023-85[2]requirements;③The pile foundation is calculated by hollowing out the soil on one side,the flexural bearing capacity and crack width meet the Literature[2]requirements.
In view of the four problems that need to be solved urgently and the need for informationization in the investigation of rail transit,an investigation information system architecture based on"GIS+ multi-role users"has been designed and developed.Its architecture in-cludes four subsystems and fourteen functional modules:investigation project management,investigation data information collection,overall management of investigation(including supervision),and investigation data and reports management.It realizes the management support of in-vestigation projects,collaborative working,and data and information management,comprehensively improving the quality,safety,efficiency,and economy of urban rail transit investigation.
A project in Guangzhou is located in an area with highly developed karst landforms.Despite initially being categorized as Class Ⅱ terrain,based on the large area of the proposed construction site,the surveying unit reclassified certain sections of the site as ClassⅢ terrain,considering the thickness of the covering layer from the natural ground surface.The design unit thoroughly discussed and demon-strated the macro-level concept of the site and the micro-level calculation of the covering layer thickness from the basement floor upwards.Consequently,the entire project was designed as Class Ⅱ terrain,successfully passing the rigorous review of structural limitations and con-struction drawing examination.Additionally,a comparison was made between the influence of using Technical Specification for Concrete Structures of Tall Buildings:JGJ 3-2010[1]and Technical Specification for Concrete Structures of Tall Buildings:Guangdong Standards DBJ/T 15-92-2021[2]on the design of super high-rise structures due to differences in terrain classification.Specifically,the T1 tower of the project was analyzed using both the Literature[1]and Literature[2]for Class Ⅱ and Class Ⅲ terrains.The results indicated that for long-period structures,the seismic coefficient sensitivity to terrain classification was lower in the national standards than in Literature[2].Prior to adjust-ment,the base shear of the T1 tower in Class Ⅲ terrain was 35%higher than that in Class Ⅱ terrain.After adjustment,the base shear in Class Ⅲ terrain was 10%higher than that in Class Ⅱ terrain.Ultimately,the T1 tower was designed based on Class Ⅱ terrain,resulting in a cost-saving of approximately 5%to 8%.
Discusses the reasons and solutions for the low pass rate of one-step forming of V-shaped column concrete construction.Through the comprehensive analysis of relevant literature and field investigation,it is found that the main reasons include nonstandard opera-tion,substandard material quality and unreasonable technological process in the construction process.In order to solve these problems,a se-ries of solutions are put forward,including strengthening the skills training of construction personnel,establishing quality monitoring system and optimizing technological process.By implementing these measures,the qualified rate of V-shaped column concrete construction can be im-proved,the engineering quality can be improved,and the cost can be reduced,which can provide useful reference for the development of related industries.
Relying on multiple unit engineering projects for the renovation of a critical bridge in a specific region of Guangdong Prov-ince,this study addresses the challenges associated with pile foundation construction in complex karst geology in the northern mountainous ar-eas of the province.The issues encountered include grout leakage and sinkholes.Different principles for treating karst caves with varying heights and filling states,as well as optimization schemes for pile foundation design,were proposed.The results indicate that for the first critical bridge in the project,the use of clay backfill and the steel casing follow-up method effectively resolved issues related to single small to medium-sized karst caves.However,for the second critical bridge in the project,which had a larger number of interconnected karst caves,avoidance measures were implemented,and the pile foundation was optimized to a double-row friction pile design.This approach sig-nificantly reduced the cost of karst cave treatment and ensured construction safety.Based on the results of core drilling and perforation test-ing,it is concluded that the karst cave treatment measures and the optimized pile foundation design adopted in this project ensure the integri-ty and good quality of the piles,meeting the required standards for construction.
Taking the selection of sewage interception well in a watershed in Zhanjiang as an example,the technical advantages and ap-plication scenarios of intelligent diversion well in watershed governance are studied.Through the application of the down weir gate intelligent diverting well in the main sewage outlet,it is proved that the intelligent diverting well has great advantages in the control of river water backflow and overflow pollution control.The intelligent diverting well can effectively improve the water quality of the river and improve the treatment effect of the water environment,and provide reference for other water environment treatment projects.At the same time,it is put forward that the interception and improvement of drainage outlets along the river is the first step of environmental governance in the basin.In order to achieve long-term control and long-term cleaning,some suggestions should be further considered,such as CSOs pollution control of combined overflow system,pollution diversion of combined culvert,accurate interception of drainage units at the source and rain and pol-lution diversion transformation.
The main structure of an arched roof library in Yangjiang City is a reinforced concrete frame structure system,and the upper roof is a large-span reinforced concrete arch structure.Discusses the characteristics and structural layout principles of the arched roof library project.Utilize two analysis software,Yingjianke YJK and MIDAS Gen,to perform small earthquake elastic calculations and medium earth-quake verification calculations on the overall structure,as well as small earthquake elastic-plastic time history analysis.Conduct specialized fi-nite element software analysis on key components such as bottom curved shear walls and floor stress with large openings.The calculation and analysis results indicate that all performance indicators of the overall structure meet the requirements of the specifications,verifying the rationality of the structural system.The component analysis results and bearing capacity review meet the requirements of use,and the design is safe and reliable.
In recent years,with the development of various major engineering projects,higher requirements and efficiency of the internal and external data of geotechnical investigation,and the information transformation of the industry is imminent.At present,many large enter-prises are already at the forefront of informatization,while some small and medium-sized enterprises are wary of the"poor usability"prob-lem of geotechnical investigation software and are still in the wait-and-see stage of the transformation.Based on this,compares and analyzes the advantages of geotechnical investigation software compared to traditional work methods,including higher efficiency,lower labor costs,and better quality of results,combining the results of previous research on informatization and existing geotechnical informatization software.The technical means and working mode of geotechnical informatization have become relatively mature,and in the future development,it is necessary to increase the attention of geotechnical and design enterprises,increase information promotion efforts,and enhance deep coopera-tion between software developers and geotechnical and design personnel.
With the widespread application of large-scale formwork support structures in modern construction,the introduction of real-time safety monitoring technology has become an inevitable choice to enhance construction safety and reduce accident risks.By conducting numeri-cal simulations to study the stress,deformation,and failure mechanisms of large-scale formwork,the monitoring parameters for assessing the working condition of these structures can be identified.Leveraging automation and informatization,the High Formwork Real-time Monitoring Alarm System is established,integrating a complete set of technologies including finite element model and on-site real-time monitoring.This system enables automated monitoring,real-time analysis and transmission,and automatic alarm for the support systems,allowing for proac-tive identification and resolution of potential safety hazards,thereby improving the accuracy and timeliness of monitoring.Additionally,com-plemented by periodic inspections,the effectiveness of monitoring and early warning can be further enhanced.The actual project proves that the system can ensure construction safety and promotes further improvements and development in construction safety management.
The anti-corrosion effect of reinforced concrete structures in municipal bridges is directly related to the service life and mainte-nance cost of bridge structures,the study of bridge structure anti-corrosion technology is of great significance.Based on practical engineering experience,studies and applies a new permeable silane impregnation technology by comparing it with traditional film-forming anti-corrosion technology.The implementation effect is good,The implementation effect is good,and the various indicators of silane impregnation technolo-gy can meet the design and specification requirements.It has advantages in anti-corrosion durability,economy,environmental protection and energy conservation,and is particularly suitable for the anti-corrosion coating protection of new bridge concrete structures.For bridge con-crete structures that have been built for a long time or have already been coated,the application effect is average.I hope to provide refer-ence for the anti-corrosion design of municipal bridge concrete.
In order to locate the bridge damage in time and extend the service time of the structure,the damage identification method of the damage index with the curvature of the norm difference of flexibility matrix is studied.The formula of damage index is derived theoreti-cally,and then a finite element model of a simply-supported beam is established for numerical simulation to verify the effectiveness of the method.The results show that the method can identify the damage location in different scenarios.And under the influence of different levels of noise,the method still has a good performance,which can be performed in the practical engineering application.
Guangzhou is one of the earliest cities in China to use architectural glass curtain wall,the early construction of architectural glass curtain wall has exceeded 25 years of design life,with the increase in the use of years,the quality of glass curtain wall problems have gradually emerged,of which the aging problem of structural adhesive of hidden frame glass curtain wall is particularly prominent.By sampling the structural adhesive of a hidden frame glass curtain wall with Shore hardness exceeding the standard requirements,the maximum strength elongation,tensile bond strength,shear strength and so on were tested and studied.The research results show that the elongation at the maximum tensile strength of the structural adhesive after hardening becomes significantly smaller,but the tensile bond strength and shear strength have less influence.34.8%of the eight specimens have the elongation at the maximum tensile strength,which is much smaller than the requirement of not less than 100%as required by"Silicone Structural Sealant for Construction:GB 16776-2005"[1],and the tensile bond strength and deformation capacity meet the specification requirements.
Takes a super high-rise financial building in Guangdong Province as an engineering example,which has very high require-ments for power quality.Introduces the influence of three-phase voltage imbalance,harmonics,reactive power compensation and other aspects on power quality,and puts forward a comprehensive treatment design scheme.Finally,the improvement of power quality and the improve-ment of power utilization rate are of great significance to promote the realization of energy conservation and emission reduction and dual car-bon strategic goals.
With increasing global attention on environmental protection and sustainable development,China is transitioning towards a green,low-carbon,and efficient development path.Low-carbon smart parks are key battlegrounds in implementing the"dual carbon"strategy.The case study of Guangzhou's low-carbon smart park focuses on the integration of intelligence and low-carbon elements.Based on industrial digitization,it implements a development approach that promotes low-carbon and intelligent features within the park.This includes the utiliza-tion of technologies such as solar photovoltaics and intelligent energy management,as well as the application of achievements like smart ener-gy consumption management platforms and distributed energy storage stations.These efforts have resulted in environmental,economic,and so-cial benefits.The study proposes development recommendations in terms of planning,management systems,and industrial structure optimiza-tion,providing valuable insights for the construction of low-carbon smart parks in smart cities.
