对异形复杂公共建筑的工程建设项目管理具有相当大的难度.本文以无锡新区科技交流中心工程建设为例,重点阐述了其合同管理、技术管理和质量管理:采用定量描述与定性描述相结合,在合同文件中详尽列出技术性能要求以控制工程造价；考察研究类似的异形工程以控制建筑效果和使用功能；将风险管理手段融合到设计与施工的技术管理之中,确保安全；事前策划精品工程施工,以争创“鲁班奖”.

The waste contained recycled concrete is produced by directly mixing new concrete in an appropriate proportion with waste concrete crushed to a certain extent.This manufacture method can simplify the work process of ordinary recycled concrete,thus reduce engineering cost,so as to popularize in application.Based on experimental study of 138 waste contained recycled concrete cubic specimens,the regularity is mastered about the water-cement ratio,sand ratio and recycled-aggregate-mixed ratio that affect concrete strength,which establishes good base for reasonable mixture proportion design of waste contained recycled concrete.The recycled-aggregate-mixed ratio can be up to 30% that experimental result provides a fine basis for popularizing use because of steady economic benefit and accepted strength(not much reduction).

Based on the parabolic Coulomb-Mohr strength criterion,a formula for predicting the ultimate punching shear strength of reinforced concrete slabs was developed.The principle of virtual work was used to derive the formula by assuming the punching failure system to be a rigid-plastic punching model.This formula also considered the favorable effects of the dowel action of bending steel rebars on the punching strength of slabs.Referring to other researchers＇ experimental results,such as punching angle and stress in reinforcing bars when punching,a simplification was introduced to make this formula suitable for engineering use.A comparison between numerical results and experimental data shows that the dowel action provides about 6%~11% of the ultimate punching shear strength of the reinforced concrete slabs and the theoretical formula is accurate enough to be a good reference in structural designs.

Based on the idea of simplifying the work process,saving work cost and popularizing engineering application,a new concrete is produced by directly mixing new concrete in an appropriate proportion with waste concrete crushed to a certain extent.It's the waste contained recycled concrete.Experimental studies on concentric compression strength,splitting tensile strength,elastic modulus,and other fundamental mechanical properties are carried out.Compared with that of common concrete,the law of these mechanical properties is obtained so as to lay the foundation for engineering application.

In the background of cfrp materials are widely used in civil engineering,simplely introduce when using software of ansys to analyze concrete structures reinforced with cfrp,we should pay attentions on some problems including unit selection,meshing,loading,etc,Overview resent years' research on the finite element analysis study of concrete structures reinforced with cfrp.

Based on the buckling experiments containing corroded longitudinal reinforcement specimens,a physical model for the usable strength of corroded longitudinal reinforcements is presented.In accordance with the ductile damage theory and the improved effective concrete section model and adhesion force degeneration model,the section strength calculation theory and methods are presented to estimate the load-carrying capacity of corroded reinforced concrete columns under the axial,small eccentric and large eccentric loads,taking diverse corrosion rates and corroded stirrups losing effectiveness into consideration.Compared with the other collected experimental results,the reliability of the proposed calculation theory and methods is verified.

Regarding to the possibility of corroded stirrups losing effectiveness locally in columns,12 specimen columns are designed and made to study the decreasing law of the load-carrying capacity of corroded reinforced concrete columns subjected to the axial,small eccentric and large eccentric loads and the recovering law of that strengthened with carbon fiber composite sheet(CFRP).

Based on ANSYS software,using Mander Model,the non-linear finite element analysis(FEA) program is compiled to analyze confining action of stirrup in the reinforced concrete columns.Compared with experimental results of 8 collected specimens,the ANSYS program can carry out sound results that including tolerance of less than 9%.So the compiled program should be applied to more engineering.

To estimate the residual capacity of corroded reinforced concrete columns with local corroded-and-broken stirrups, corroded specimens were prepared in the laboratory by electro-chemical accelerated corrosion method, and four types of longitudinal load-displacement curves, i.e. nominal constitutive relations, were derived from a series of buckling experiments for reinforcements, containing 197 specimens with various diameters (φ18 mm, φ20 mm, φ22 mm and φ12 mm), length-to-diameter ratios (from 4.55 to 53.43) and corrosion rates (including 0, 10%, 20% and 30%). Based on the consideration that a reinforced concrete column should possess enough ductility when it fails, a physical model for the usable strength of corroded longitudinal reinforcements is presented by treating nominal constitutive relations model with horizontal cuts, and a set of formulas to estimate residual capacity for corroded reinforced concrete columns under the axial, small eccentric and large eccentric loads are proposed. Compared with the experimental data of 51 corroded reinforced concrete columns, the results obtained from proposed formulas that involve coefficients k u and k co have satisfactory accuracy. It is indicated that the proposed formulas can be well used to estimate the residual capacity of existed concrete columns.

This paper presents an analysis of the buckling carrying capacity degeneration of corroded reinforcing bars by using ANSYS software,and also an inuestigation of the full load-longitudinal displacement equilibrium path of corroded reinforcement with the arc-length method.A detailed study is also made to reveal the rule of longitudinal bars in the compression region of corroded and cracked concrete structures buckling before reaching yield strength due to local stirrups being gravely corroded and broken.Yield strength,initial flexure and length-to-diameter ratio of corroded reinforcing bars have been taken into the consideration of the analysis of the capacity degeneration.Four types of longitudinal loaddisplacement curves are proposed on the basis of numerous analysis results.A comparative study show that the results of the proposed equations of curves agree well with the experimental data of 197 corroded specimens.The proposed equations are feasible to estimate the residual carrying capacity of corroded and cracked concrete structures.

Nonlinear buckling analysis is applied to bars with degenerated load-carrying capacity.The full load-longitudinal displacement(F—u)equilibrium path is theoretically investigated by using finite element approach in conjunction with the arc-length method.Those longitudinal bars in the compression region of concrete section are buckled before reaching yield strength due to local stirrups corroded and cut off has been studied in details.It is found that the yield strength,geometric flaws(initial flexure) and length-to-diameter ratio of reinforcing bars affect significantly the degeneration characteristics of load-carrying capacity of longitudinal reinforcement.Practical equations of F—u curves are obtained by fitting of great quantity of analyzed results.Compared with the test results,the practical curve has less discrepancy and can be used to evaluate the residual load-carrying capacity of corroded reinforced concrete structures.

Based on the characteristics of a corroded multi-story RC frame with changed function,the inverted analysis method is used to optimize loads applied on the up-structures so as to satisfy bearing capacities of the foundation.Section increasing method is given priority to apply to the corroded columns,and then the comprehensive method to the beams,external prestressing method to the slabs.One-year sound service and test prove that all members are in good performance and the design program is favorable.

碳纤维增强聚合物(CFRP)材料具有轻质高强等优良性能,广泛应用于钢筋混凝土结构加固工程.介绍CFRP加固混凝土梁、板、柱以及抗震加固和抗疲劳加固的相关研究,以及CFRP加固钢筋混凝土结构的施工技术及国内外典型工程应用情况.

Combined with an engineering example,nonlinear buckling analysis was conducted for the optimized Γ-shaped frame by using ANSYS finite element software.This paper calculated 5 work states to obtain important conclusions: the post-buckling of the Γ-shaped frame is unstable;this kind of structure is sensitive to the initial flaws;initial negative displacement in the mid span can enhance post-buckling strength,but the initial positive one can sharply degrade it,to which enough attention should be paid during design and installation.