Construction Stage Analysis Midas Civil. Presenter: Robert Salca technical support engineer, Midas UK
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1 Construction Stage Analysis Midas Civil Presenter: Robert Salca technical support engineer, Midas UK
2 In order to make sure that the sound system is working well a poll will appear shortly on your screens. Please vote by YES or NO.
3 Contents Why Construction Stage Analysis? Conventional Analysis vs Construction Stage Analysis Construction Stage Analysis in Midas Civil Procedure for Construction Stage Analysis Time Dependent Material Properties Construction Stage Definition Construction Stage Results Live Demonstration Q&A Sutong Bridge
4 Why Construction Stage Analysis? Each temporary structure arrangement ca lead to critical internal forces or displacements in specific members; Each temporary structure at a particular stage of construction affects the subsequent stages; It is common to install and dismantle temporary supports and cables during construction; The structural behaviours such as deflections and stress re-distribution continue to change during and after the construction due to varying time dependent properties such as concrete creep, shrinkage, modulus of elasticity (aging) and tendon relaxation; The safest and most economical construction process must be chosen, especially for complex construction operations.
5 Contents Why Construction Stage Analysis? Conventional Analysis vs Construction Stage Analysis Construction Stage Analysis in Midas Civil Procedure for Construction Stage Analysis Time Dependent Material Properties Construction Stage Definition Construction Stage Results Live Demonstration Q&A Stonecutters Bridge
6 Conventional Analysis vs Construction Stage Analysis General analysis is performed under the assumption that all loads are simultaneously applied to a completed structure; This assumption is not valid in a real construction sequence because most bridges are constructed by segments and the dead load acts sequentially.
7 Conventional Analysis vs Construction Stage Analysis Conventional Analysis Construction Stage Analysis Stage 1 Stage 2 Stage 3
8 Conventional Analysis vs Construction Stage Analysis Conventional analysis Construction Stage Analysis
9 Contents Why Construction Stage Analysis? Conventional Analysis vs Construction Stage Analysis Construction Stage Analysis in Midas Civil Procedure for Construction Stage Analysis Time Dependent Material Properties Construction Stage Definition Construction Stage Results Live Demonstration Q&A Basarab Viaduct Bridge
10 Construction Stage Analysis in Midas Civil Time dependent material properties Creep effects of concrete members having different maturities; Shrinkage effects of concrete members having different maturities; Time dependent compressive strength gain for concrete members; Prestressing tendon relaxation. Expression of Construction Stages Creation (activation) and deletion (deactivation) of members with certain maturities; Loading (activation) and unloading (deactivation) of loads relative to time; Change of boundary conditions relative to time.
11 Contents Why Construction Stage Analysis? Conventional Analysis vs Construction Stage Analysis Construction Stage Analysis in Midas Civil Procedure for Construction Stage Analysis Time Dependent Material Properties Construction Stage Definition Construction Stage Results Live Demonstration Q&A Lange Wapper Bridge
12 Procedure for Construction Stage Analysis Create a structural model. Assign elements, loads and boundary conditions to be activated or deactivated to each construction stage together as a group; Define the time dependent material properties such as creep and shrinkage. The time dependent material properties may be user defined or defined by the standards such as ACI and CEB-FIP; Link the defined time dependent material properties to the general material properties through which the change of the concrete member material properties with time are automatically calculated and reflected; Create the construction stages and time steps considering the true sequence of construction; Define the construction stages using the predefined Element groups, Boundary groups and Load groups; Specify the desired analysis conditions and carry out the analysis; Combine the results of the construction stage analysis and that of the completed structure analysis as necessary.
13 Contents Why Construction Stage Analysis? Conventional Analysis vs Construction Stage Analysis Construction Stage Analysis in Midas Civil Procedure for Construction Stage Analysis Time Dependent Material Properties Construction Stage Definition Construction Stage Results Live Demonstration Q&A El Marquez Bridge
14 Time Dependent Material Properties Creep Increase in water/cement ratio increases creep; Creep decreases with increases in the age and strength of concrete when the concrete is subjected to stress; Creep deformations increase with increase in ambient temperature and decrease in humidity; It also depends on many other factors related to the quality of the concrete and conditions of exposure such as the type, amount, and maximum size of aggregate; type of cement; amount of cement paste; size and shape of the concrete mass; amount of steel reinforcement; and curing conditions. Shrinkage The rate of shrinkage decreases rapidly with time; Finer aggregates and finer gels result in increased shrinkage; The moisture content of the concrete and the relative humidity of the ambient medium have a big influence on carbonation shrinkage; Harder aggregates with higher modulus of elasticity decrease shrinkage.
15 Time Dependent Material Properties Creep & Shrinkage Strength Gain
16 Contents Why Construction Stage Analysis? Conventional Analysis vs Construction Stage Analysis Construction Stage Analysis in Midas Civil Procedure for Construction Stage Analysis Time Dependent Material Properties Construction Stage Definition Construction Stage Results Live Demonstration Q&A La Jabalina Bridge
17 Construction Stage Definition Group activation/deactivation concept; Four types of groups: Structure groups; Load groups; Boundary groups; Tendon groups. Elements can be activated at any age, with properties accounting for the passage of time; Partial or total force redistribution can be considered at deactivation of elements; Loads can be activated/deactivated at any time during a construction stage; Supports can be activated/deactivated at any time, either at the deformed or at the original position of the nodes.
18 Construction Stage Definition
19 Composite Section for Construction Stage Pre-composite stage Composite stage
20 Construction Stage Analysis Control Data
21 Contents Why Construction Stage Analysis? Conventional Analysis vs Construction Stage Analysis Construction Stage Analysis in Midas Civil Procedure for Construction Stage Analysis Time Dependent Material Properties Construction Stage Definition Construction Stage Results Live Demonstration Q&A Lazarevsky Bridge
22 Construction Stage Results Load Case Results Description Reaction 1. CS: Dead Load Deformation Force Results due to all loadings excluding Erection Load and the effects of Creep, Shrinkage and Tendon Prestress 2. CS: Erection Load Reaction Results due to dead loads, which are separated from CS: Dead Load, defined in Construction Stage Analysis Control Deformation Data dialog Force 3. CS : Tendon Primary Reaction Deformation Deformation resulting from tendon prestress Force Member forces resulting from tendon prestress Reaction Reactions caused by Tendon Prestress in an indeterminate structure 4. CS: Tendon Secondary Force Member forces caused by Tendon Prestress in an indeterminate structure 5. CS: Creep Primary 6. CS: Creep Secondary 7. CS: Shrinkage Primary 8. CS: Shrinkage Secondary CS: Summation Reaction Deformation Force Reaction Force Reaction Deformation Force Reaction Force Reaction Deformation Force Deformation due to imaginary forces required to cause creep stain Imaginary forces required to cause creep stain Reactions caused by creep in an indeterminate structure Member forces caused by creep in an indeterminate structure Deformation due to imaginary forces required to cause shrinkage stain Imaginary forces required to cause shrinkage stain Reactions caused by shrinkage in an indeterminate structure Member forces caused by shrinkage in an indeterminate structure
23 Construction Stage Results Dead Load Prestress Creep Shrinkage Summation
24 Construction Stage Results for Tendon Prestress Loss
25 Construction Stage Results for Composite Sections
26 Contents Why Construction Stage Analysis? Conventional Analysis vs Construction Stage Analysis Construction Stage Analysis in Midas Civil Procedure for Construction Stage Analysis Time Dependent Material Properties Construction Stage Definition Construction Stage Results Live Demonstration Q&A Ironton-Russell Bridge
27 Construction Stage Model Stage 1 Activate substructure; Activate Self Weight load; Activate substructure supports.
28 Construction Stage Model Stage 2 Activate girders; Activate Prestress load; Activate Wet Concrete load; Activate temporary supports and links.
29 Construction Stage Model Stage 3 Long-term stage; Activate slab part of composite section and transverse grillage elements; Activate Superimposed Dead load; Deactivated Wet Concrete load; Deactivate simply supported condition; Activate final supports for girders.
30 Contents Why Construction Stage Analysis? Conventional Analysis vs Construction Stage Analysis Construction Stage Analysis in Midas Civil Procedure for Construction Stage Analysis Time Dependent Material Properties Construction Stage Definition Construction Stage Results Live Demonstration Q&A Bang Hwa Bridge
31 Q&A Thank you! en.midasuser.com For any questions send an at:
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