SECTION ANALYSIS PROGRAM RESPONSE 2000

Transcription

1 SECTION ANALYSIS PROGRAM RESPONSE 2000 DESCRIPTION Response-2000 is a user friendly sectional analysis program that can be used to predict the complete load-deformation response of a reinforced or prestressed concrete cross-section subjected to the combined actions of shear, moment, and axial load. Program Response-2000 is made freely available from the following web site: At this web site you will also find numerous examples and other program resources. Once you have downloaded, installed, and started Response, a menu will appear at the top of the screen. The components of each menu item are listed below. File Define Loads Solve View Options Help New Quick Define Loads Full-Response Cross Section Preferences Contents Open Edit General Time Dep. Effects More-Detail 1 Cross Section Plot Print in Color Using Help Close Material Properties Detail T&S Strains Member Response 9 Cross Section Plots Object Options About Save Concrete Section Strain Discontinuity One Load Next Load Stage Insert Text Box Save As Transverse Reinf. Full Member Properties 2-Strain Previous Load Stage Insert Beam Graphic Print Preview Longitudinal Reinf. 1-Strain Load-Deformation Plot Insert Chart Print Tendons M-N Interaction Pushover Results Delect Selection Print Setup M-V Interaction MRU List N-V Interaction Exit Stop Analysis The menu sub-headings shown in italics are common to most windows program and considered self-explanatory The menu sub-headings shown in bold font, are further described below. The menu sub-headings shown in normal text are additional or supplemental features. Define-Material Properties: In this menu, the user selects basic material properties (f c,f y, f pu ). By clicking a Detailed sub-option, the user may define these parameters in greater detail such as by selecting the shape of the compressive response relationship. Define-Concrete Section: In this menu, the user defines the shape of the concrete cross-section by using one of many predefined section shapes or by defining their own section. Note the menu of shapes that are available. Define-Transverse Reinforcement, Longitudinal Reinforcement, and Tendons: In selecting reinforcement, you must first define a name for the layer being defined, select the reinforcement, and then click Add. Loads-Loads: This enables the user to specify the loading (Axial Load, Moment, and Shear) as a constant + an increment.

2 Solve-Section Response: Clicking this causes the program to solve for the load deformation response of the defined section subjected to the specified loading. Solve-2 Strain: This allows the user to specify the strain distribution over the depth. The program will find the corresponding moment and axial load. Solve-1 Strain: This finds the deformation state corresponding to the defined loading ratios with one strain defined. Solve Member Response: This will predict the response of a longitudinal section of the member. To use this feature, it is necessary to first define the longitudinal section properties in the Loads Full Member Properties menu. View-Cross Section: This shows the cross-section, material and reinforcing properties. View-1 Section Plot: This shows one selected load-deformation plot View-9 Section Plot: This shows 9 graphical images including moment-curvature response. This is the recommended View to understand the experimental response. View-Load Deformation Plot: This allows the user to create whatever plot they wish. Options-Preferences: In this sub-heading, the user selects which system of units to use.

3 OVERVIEW OF IN-CLASS DEMONSTRATION This is a summary of keystrokes used to examine the response of a rectangular beam (b = 300 [mm], h = 900 [mm], f c = 35 [MPa], and A s = 4 Ø 22 bars that are located 60 [mm] from the bottom of the member). The underlined items shown in this example are menu selections. Use your mouse to navigate through the menu options. Options-Preferences : Select SI Metric Units and click OK Define-Material Properties : Change Concrete Cylinder Strength to 35 [MPa] and click OK Define-Concrete Section : Select the rectangular shape by clicking on it. Choose b = 300 [mm], h = 900 [mm] and click OK Define Longitudinal Reinforcement : Name = layer1 Number of Bars = 4 Selection Type : click on Select by area Bar Area = 380 [mm 2 ] (Ø 22) Distance from Bottom = 60 [mm] Select Add and Click OK Loads Loads : Select Moment Increment = 1 [knm] and set others equal to zero, Select OK Solve Sectional-Response : Once the analysis is complete, click on the control plot (lower left figure with shaded background). Page-Up and Page-Down are used move along the control plot. The figures on the right describe the response at each corresponding load step. Clicking the right Mouse button will allow the user to view the numerical results. Solve MN Interaction : Observe curve being created Press Page-Down key to illustrate condition along MN boundary

4 Load Full Member Properties : Select the length subject to shear equal to 2500 [mm]. The default settings are for the analysis of the left side of a simply supported beam that supports a center point load. Click OK. Solve Member-Response : Press Page-Down and Page-Up to view response of longitudinal section over range of loading

5 INPUT OUTPUT